12 files changed, 0 insertions, 5854 deletions
diff --git a/phpBB/includes/db/driver/driver.php b/phpBB/includes/db/driver/driver.php
deleted file mode 100644
index b915ee081b..0000000000
--- a/phpBB/includes/db/driver/driver.php
+++ /dev/null
@@ -1,1044 +0,0 @@
-<?php
-/**
-*
-* @package dbal
-* @copyright (c) 2005 phpBB Group
-* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
-*
-*/
-
-/**
-* @ignore
-*/
-if (!defined('IN_PHPBB'))
-{
-	exit;
-}
-
-/**
-* Database Abstraction Layer
-* @package dbal
-*/
-class phpbb_db_driver
-{
-	var $db_connect_id;
-	var $query_result;
-	var $return_on_error = false;
-	var $transaction = false;
-	var $sql_time = 0;
-	var $num_queries = array();
-	var $open_queries = array();
-
-	var $curtime = 0;
-	var $query_hold = '';
-	var $html_hold = '';
-	var $sql_report = '';
-
-	var $persistency = false;
-	var $user = '';
-	var $server = '';
-	var $dbname = '';
-
-	// Set to true if error triggered
-	var $sql_error_triggered = false;
-
-	// Holding the last sql query on sql error
-	var $sql_error_sql = '';
-	// Holding the error information - only populated if sql_error_triggered is set
-	var $sql_error_returned = array();
-
-	// Holding transaction count
-	var $transactions = 0;
-
-	// Supports multi inserts?
-	var $multi_insert = false;
-
-	/**
-	* Current sql layer
-	*/
-	var $sql_layer = '';
-
-	/**
-	* Wildcards for matching any (%) or exactly one (_) character within LIKE expressions
-	*/
-	var $any_char;
-	var $one_char;
-
-	/**
-	* Exact version of the DBAL, directly queried
-	*/
-	var $sql_server_version = false;
-
-	/**
-	* Constructor
-	*/
-	function __construct()
-	{
-		$this->num_queries = array(
-			'cached'	=> 0,
-			'normal'	=> 0,
-			'total'		=> 0,
-		);
-
-		// Fill default sql layer based on the class being called.
-		// This can be changed by the specified layer itself later if needed.
-		$this->sql_layer = substr(get_class($this), strlen('phpbb_db_driver_'));
-
-		// Do not change this please! This variable is used to easy the use of it - and is hardcoded.
-		$this->any_char = chr(0) . '%';
-		$this->one_char = chr(0) . '_';
-	}
-
-	/**
-	* return on error or display error message
-	*/
-	function sql_return_on_error($fail = false)
-	{
-		$this->sql_error_triggered = false;
-		$this->sql_error_sql = '';
-
-		$this->return_on_error = $fail;
-	}
-
-	/**
-	* Return number of sql queries and cached sql queries used
-	*/
-	function sql_num_queries($cached = false)
-	{
-		return ($cached) ? $this->num_queries['cached'] : $this->num_queries['normal'];
-	}
-
-	/**
-	* Add to query count
-	*/
-	function sql_add_num_queries($cached = false)
-	{
-		$this->num_queries['cached'] += ($cached !== false) ? 1 : 0;
-		$this->num_queries['normal'] += ($cached !== false) ? 0 : 1;
-		$this->num_queries['total'] += 1;
-	}
-
-	/**
-	* DBAL garbage collection, close sql connection
-	*/
-	function sql_close()
-	{
-		if (!$this->db_connect_id)
-		{
-			return false;
-		}
-
-		if ($this->transaction)
-		{
-			do
-			{
-				$this->sql_transaction('commit');
-			}
-			while ($this->transaction);
-		}
-
-		foreach ($this->open_queries as $query_id)
-		{
-			$this->sql_freeresult($query_id);
-		}
-
-		// Connection closed correctly. Set db_connect_id to false to prevent errors
-		if ($result = $this->_sql_close())
-		{
-			$this->db_connect_id = false;
-		}
-
-		return $result;
-	}
-
-	/**
-	* Build LIMIT query
-	* Doing some validation here.
-	*/
-	function sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)
-	{
-		if (empty($query))
-		{
-			return false;
-		}
-
-		// Never use a negative total or offset
-		$total = ($total < 0) ? 0 : $total;
-		$offset = ($offset < 0) ? 0 : $offset;
-
-		return $this->_sql_query_limit($query, $total, $offset, $cache_ttl);
-	}
-
-	/**
-	* Fetch all rows
-	*/
-	function sql_fetchrowset($query_id = false)
-	{
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($query_id !== false)
-		{
-			$result = array();
-			while ($row = $this->sql_fetchrow($query_id))
-			{
-				$result[] = $row;
-			}
-
-			return $result;
-		}
-
-		return false;
-	}
-
-	/**
-	* Seek to given row number
-	* rownum is zero-based
-	*/
-	function sql_rowseek($rownum, &$query_id)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache && $cache->sql_exists($query_id))
-		{
-			return $cache->sql_rowseek($rownum, $query_id);
-		}
-
-		if ($query_id === false)
-		{
-			return false;
-		}
-
-		$this->sql_freeresult($query_id);
-		$query_id = $this->sql_query($this->last_query_text);
-
-		if ($query_id === false)
-		{
-			return false;
-		}
-
-		// We do not fetch the row for rownum == 0 because then the next resultset would be the second row
-		for ($i = 0; $i < $rownum; $i++)
-		{
-			if (!$this->sql_fetchrow($query_id))
-			{
-				return false;
-			}
-		}
-
-		return true;
-	}
-
-	/**
-	* Fetch field
-	* if rownum is false, the current row is used, else it is pointing to the row (zero-based)
-	*/
-	function sql_fetchfield($field, $rownum = false, $query_id = false)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($query_id !== false)
-		{
-			if ($rownum !== false)
-			{
-				$this->sql_rowseek($rownum, $query_id);
-			}
-
-			if ($cache && !is_object($query_id) && $cache->sql_exists($query_id))
-			{
-				return $cache->sql_fetchfield($query_id, $field);
-			}
-
-			$row = $this->sql_fetchrow($query_id);
-			return (isset($row[$field])) ? $row[$field] : false;
-		}
-
-		return false;
-	}
-
-	/**
-	* Correctly adjust LIKE expression for special characters
-	* Some DBMS are handling them in a different way
-	*
-	* @param string $expression The expression to use. Every wildcard is escaped, except $this->any_char and $this->one_char
-	* @return string LIKE expression including the keyword!
-	*/
-	function sql_like_expression($expression)
-	{
-		$expression = utf8_str_replace(array('_', '%'), array("\_", "\%"), $expression);
-		$expression = utf8_str_replace(array(chr(0) . "\_", chr(0) . "\%"), array('_', '%'), $expression);
-
-		return $this->_sql_like_expression('LIKE \'' . $this->sql_escape($expression) . '\'');
-	}
-
-	/**
-	* Build a case expression
-	*
-	* Note: The two statements action_true and action_false must have the same data type (int, vchar, ...) in the database!
-	*
-	* @param	string	$condition		The condition which must be true, to use action_true rather then action_else
-	* @param	string	$action_true	SQL expression that is used, if the condition is true
-	* @param	string	$action_else	SQL expression that is used, if the condition is false, optional
-	* @return	string			CASE expression including the condition and statements
-	*/
-	public function sql_case($condition, $action_true, $action_false = false)
-	{
-		$sql_case = 'CASE WHEN ' . $condition;
-		$sql_case .= ' THEN ' . $action_true;
-		$sql_case .= ($action_false !== false) ? ' ELSE ' . $action_false : '';
-		$sql_case .= ' END';
-		return $sql_case;
-	}
-
-	/**
-	* Build a concatenated expression
-	*
-	* @param	string	$expr1		Base SQL expression where we append the second one
-	* @param	string	$expr2		SQL expression that is appended to the first expression
-	* @return	string		Concatenated string
-	*/
-	public function sql_concatenate($expr1, $expr2)
-	{
-		return $expr1 . ' || ' . $expr2;
-	}
-
-	/**
-	* Returns whether results of a query need to be buffered to run a transaction while iterating over them.
-	*
-	* @return bool Whether buffering is required.
-	*/
-	function sql_buffer_nested_transactions()
-	{
-		return false;
-	}
-
-	/**
-	* SQL Transaction
-	* @access private
-	*/
-	function sql_transaction($status = 'begin')
-	{
-		switch ($status)
-		{
-			case 'begin':
-				// If we are within a transaction we will not open another one, but enclose the current one to not loose data (prevening auto commit)
-				if ($this->transaction)
-				{
-					$this->transactions++;
-					return true;
-				}
-
-				$result = $this->_sql_transaction('begin');
-
-				if (!$result)
-				{
-					$this->sql_error();
-				}
-
-				$this->transaction = true;
-			break;
-
-			case 'commit':
-				// If there was a previously opened transaction we do not commit yet... but count back the number of inner transactions
-				if ($this->transaction && $this->transactions)
-				{
-					$this->transactions--;
-					return true;
-				}
-
-				// Check if there is a transaction (no transaction can happen if there was an error, with a combined rollback and error returning enabled)
-				// This implies we have transaction always set for autocommit db's
-				if (!$this->transaction)
-				{
-					return false;
-				}
-
-				$result = $this->_sql_transaction('commit');
-
-				if (!$result)
-				{
-					$this->sql_error();
-				}
-
-				$this->transaction = false;
-				$this->transactions = 0;
-			break;
-
-			case 'rollback':
-				$result = $this->_sql_transaction('rollback');
-				$this->transaction = false;
-				$this->transactions = 0;
-			break;
-
-			default:
-				$result = $this->_sql_transaction($status);
-			break;
-		}
-
-		return $result;
-	}
-
-	/**
-	* Build sql statement from array for insert/update/select statements
-	*
-	* Idea for this from Ikonboard
-	* Possible query values: INSERT, INSERT_SELECT, UPDATE, SELECT
-	*
-	*/
-	function sql_build_array($query, $assoc_ary = false)
-	{
-		if (!is_array($assoc_ary))
-		{
-			return false;
-		}
-
-		$fields = $values = array();
-
-		if ($query == 'INSERT' || $query == 'INSERT_SELECT')
-		{
-			foreach ($assoc_ary as $key => $var)
-			{
-				$fields[] = $key;
-
-				if (is_array($var) && is_string($var[0]))
-				{
-					// This is used for INSERT_SELECT(s)
-					$values[] = $var[0];
-				}
-				else
-				{
-					$values[] = $this->_sql_validate_value($var);
-				}
-			}
-
-			$query = ($query == 'INSERT') ? ' (' . implode(', ', $fields) . ') VALUES (' . implode(', ', $values) . ')' : ' (' . implode(', ', $fields) . ') SELECT ' . implode(', ', $values) . ' ';
-		}
-		else if ($query == 'MULTI_INSERT')
-		{
-			trigger_error('The MULTI_INSERT query value is no longer supported. Please use sql_multi_insert() instead.', E_USER_ERROR);
-		}
-		else if ($query == 'UPDATE' || $query == 'SELECT')
-		{
-			$values = array();
-			foreach ($assoc_ary as $key => $var)
-			{
-				$values[] = "$key = " . $this->_sql_validate_value($var);
-			}
-			$query = implode(($query == 'UPDATE') ? ', ' : ' AND ', $values);
-		}
-
-		return $query;
-	}
-
-	/**
-	* Build IN or NOT IN sql comparison string, uses <> or = on single element
-	* arrays to improve comparison speed
-	*
-	* @access public
-	* @param	string	$field				name of the sql column that shall be compared
-	* @param	array	$array				array of values that are allowed (IN) or not allowed (NOT IN)
-	* @param	bool	$negate				true for NOT IN (), false for IN () (default)
-	* @param	bool	$allow_empty_set	If true, allow $array to be empty, this function will return 1=1 or 1=0 then. Default to false.
-	*/
-	function sql_in_set($field, $array, $negate = false, $allow_empty_set = false)
-	{
-		if (!sizeof($array))
-		{
-			if (!$allow_empty_set)
-			{
-				// Print the backtrace to help identifying the location of the problematic code
-				$this->sql_error('No values specified for SQL IN comparison');
-			}
-			else
-			{
-				// NOT IN () actually means everything so use a tautology
-				if ($negate)
-				{
-					return '1=1';
-				}
-				// IN () actually means nothing so use a contradiction
-				else
-				{
-					return '1=0';
-				}
-			}
-		}
-
-		if (!is_array($array))
-		{
-			$array = array($array);
-		}
-
-		if (sizeof($array) == 1)
-		{
-			@reset($array);
-			$var = current($array);
-
-			return $field . ($negate ? ' <> ' : ' = ') . $this->_sql_validate_value($var);
-		}
-		else
-		{
-			return $field . ($negate ? ' NOT IN ' : ' IN ') . '(' . implode(', ', array_map(array($this, '_sql_validate_value'), $array)) . ')';
-		}
-	}
-
-	/**
-	* Run binary AND operator on DB column.
-	* Results in sql statement: "{$column_name} & (1 << {$bit}) {$compare}"
-	*
-	* @param string $column_name The column name to use
-	* @param int $bit The value to use for the AND operator, will be converted to (1 << $bit). Is used by options, using the number schema... 0, 1, 2...29
-	* @param string $compare Any custom SQL code after the check (for example "= 0")
-	*/
-	function sql_bit_and($column_name, $bit, $compare = '')
-	{
-		if (method_exists($this, '_sql_bit_and'))
-		{
-			return $this->_sql_bit_and($column_name, $bit, $compare);
-		}
-
-		return $column_name . ' & ' . (1 << $bit) . (($compare) ? ' ' . $compare : '');
-	}
-
-	/**
-	* Run binary OR operator on DB column.
-	* Results in sql statement: "{$column_name} | (1 << {$bit}) {$compare}"
-	*
-	* @param string $column_name The column name to use
-	* @param int $bit The value to use for the OR operator, will be converted to (1 << $bit). Is used by options, using the number schema... 0, 1, 2...29
-	* @param string $compare Any custom SQL code after the check (for example "= 0")
-	*/
-	function sql_bit_or($column_name, $bit, $compare = '')
-	{
-		if (method_exists($this, '_sql_bit_or'))
-		{
-			return $this->_sql_bit_or($column_name, $bit, $compare);
-		}
-
-		return $column_name . ' | ' . (1 << $bit) . (($compare) ? ' ' . $compare : '');
-	}
-
-	/**
-	* Returns SQL string to cast a string expression to an int.
-	*
-	* @param  string $expression An expression evaluating to string
-	* @return string             Expression returning an int
-	*/
-	function cast_expr_to_bigint($expression)
-	{
-		return $expression;
-	}
-
-	/**
-	* Returns SQL string to cast an integer expression to a string.
-	*
-	* @param  string $expression An expression evaluating to int
-	* @return string             Expression returning a string
-	*/
-	function cast_expr_to_string($expression)
-	{
-		return $expression;
-	}
-
-	/**
-	* Run LOWER() on DB column of type text (i.e. neither varchar nor char).
-	*
-	* @param string $column_name	The column name to use
-	*
-	* @return string				A SQL statement like "LOWER($column_name)"
-	*/
-	function sql_lower_text($column_name)
-	{
-		return "LOWER($column_name)";
-	}
-
-	/**
-	* Run more than one insert statement.
-	*
-	* @param string $table table name to run the statements on
-	* @param array $sql_ary multi-dimensional array holding the statement data.
-	*
-	* @return bool false if no statements were executed.
-	* @access public
-	*/
-	function sql_multi_insert($table, $sql_ary)
-	{
-		if (!sizeof($sql_ary))
-		{
-			return false;
-		}
-
-		if ($this->multi_insert)
-		{
-			$ary = array();
-			foreach ($sql_ary as $id => $_sql_ary)
-			{
-				// If by accident the sql array is only one-dimensional we build a normal insert statement
-				if (!is_array($_sql_ary))
-				{
-					return $this->sql_query('INSERT INTO ' . $table . ' ' . $this->sql_build_array('INSERT', $sql_ary));
-				}
-
-				$values = array();
-				foreach ($_sql_ary as $key => $var)
-				{
-					$values[] = $this->_sql_validate_value($var);
-				}
-				$ary[] = '(' . implode(', ', $values) . ')';
-			}
-
-			return $this->sql_query('INSERT INTO ' . $table . ' ' . ' (' . implode(', ', array_keys($sql_ary[0])) . ') VALUES ' . implode(', ', $ary));
-		}
-		else
-		{
-			foreach ($sql_ary as $ary)
-			{
-				if (!is_array($ary))
-				{
-					return false;
-				}
-
-				$result = $this->sql_query('INSERT INTO ' . $table . ' ' . $this->sql_build_array('INSERT', $ary));
-
-				if (!$result)
-				{
-					return false;
-				}
-			}
-		}
-
-		return true;
-	}
-
-	/**
-	* Function for validating values
-	* @access private
-	*/
-	function _sql_validate_value($var)
-	{
-		if (is_null($var))
-		{
-			return 'NULL';
-		}
-		else if (is_string($var))
-		{
-			return "'" . $this->sql_escape($var) . "'";
-		}
-		else
-		{
-			return (is_bool($var)) ? intval($var) : $var;
-		}
-	}
-
-	/**
-	* Build sql statement from array for select and select distinct statements
-	*
-	* Possible query values: SELECT, SELECT_DISTINCT
-	*/
-	function sql_build_query($query, $array)
-	{
-		$sql = '';
-		switch ($query)
-		{
-			case 'SELECT':
-			case 'SELECT_DISTINCT';
-
-				$sql = str_replace('_', ' ', $query) . ' ' . $array['SELECT'] . ' FROM ';
-
-				// Build table array. We also build an alias array for later checks.
-				$table_array = $aliases = array();
-				$used_multi_alias = false;
-
-				foreach ($array['FROM'] as $table_name => $alias)
-				{
-					if (is_array($alias))
-					{
-						$used_multi_alias = true;
-
-						foreach ($alias as $multi_alias)
-						{
-							$table_array[] = $table_name . ' ' . $multi_alias;
-							$aliases[] = $multi_alias;
-						}
-					}
-					else
-					{
-						$table_array[] = $table_name . ' ' . $alias;
-						$aliases[] = $alias;
-					}
-				}
-
-				// We run the following code to determine if we need to re-order the table array. ;)
-				// The reason for this is that for multi-aliased tables (two equal tables) in the FROM statement the last table need to match the first comparison.
-				// DBMS who rely on this: Oracle, PostgreSQL and MSSQL. For all other DBMS it makes absolutely no difference in which order the table is.
-				if (!empty($array['LEFT_JOIN']) && sizeof($array['FROM']) > 1 && $used_multi_alias !== false)
-				{
-					// Take first LEFT JOIN
-					$join = current($array['LEFT_JOIN']);
-
-					// Determine the table used there (even if there are more than one used, we only want to have one
-					preg_match('/(' . implode('|', $aliases) . ')\.[^\s]+/U', str_replace(array('(', ')', 'AND', 'OR', ' '), '', $join['ON']), $matches);
-
-					// If there is a first join match, we need to make sure the table order is correct
-					if (!empty($matches[1]))
-					{
-						$first_join_match = trim($matches[1]);
-						$table_array = $last = array();
-
-						foreach ($array['FROM'] as $table_name => $alias)
-						{
-							if (is_array($alias))
-							{
-								foreach ($alias as $multi_alias)
-								{
-									($multi_alias === $first_join_match) ? $last[] = $table_name . ' ' . $multi_alias : $table_array[] = $table_name . ' ' . $multi_alias;
-								}
-							}
-							else
-							{
-								($alias === $first_join_match) ? $last[] = $table_name . ' ' . $alias : $table_array[] = $table_name . ' ' . $alias;
-							}
-						}
-
-						$table_array = array_merge($table_array, $last);
-					}
-				}
-
-				$sql .= $this->_sql_custom_build('FROM', implode(' CROSS JOIN ', $table_array));
-
-				if (!empty($array['LEFT_JOIN']))
-				{
-					foreach ($array['LEFT_JOIN'] as $join)
-					{
-						$sql .= ' LEFT JOIN ' . key($join['FROM']) . ' ' . current($join['FROM']) . ' ON (' . $join['ON'] . ')';
-					}
-				}
-
-				if (!empty($array['WHERE']))
-				{
-					$sql .= ' WHERE ' . $this->_sql_custom_build('WHERE', $array['WHERE']);
-				}
-
-				if (!empty($array['GROUP_BY']))
-				{
-					$sql .= ' GROUP BY ' . $array['GROUP_BY'];
-				}
-
-				if (!empty($array['ORDER_BY']))
-				{
-					$sql .= ' ORDER BY ' . $array['ORDER_BY'];
-				}
-
-			break;
-		}
-
-		return $sql;
-	}
-
-	/**
-	* display sql error page
-	*/
-	function sql_error($sql = '')
-	{
-		global $auth, $user, $config;
-
-		// Set var to retrieve errored status
-		$this->sql_error_triggered = true;
-		$this->sql_error_sql = $sql;
-
-		$this->sql_error_returned = $this->_sql_error();
-
-		if (!$this->return_on_error)
-		{
-			$message = 'SQL ERROR [ ' . $this->sql_layer . ' ]<br /><br />' . $this->sql_error_returned['message'] . ' [' . $this->sql_error_returned['code'] . ']';
-
-			// Show complete SQL error and path to administrators only
-			// Additionally show complete error on installation or if extended debug mode is enabled
-			// The DEBUG constant is for development only!
-			if ((isset($auth) && $auth->acl_get('a_')) || defined('IN_INSTALL') || defined('DEBUG'))
-			{
-				$message .= ($sql) ? '<br /><br />SQL<br /><br />' . htmlspecialchars($sql) : '';
-			}
-			else
-			{
-				// If error occurs in initiating the session we need to use a pre-defined language string
-				// This could happen if the connection could not be established for example (then we are not able to grab the default language)
-				if (!isset($user->lang['SQL_ERROR_OCCURRED']))
-				{
-					$message .= '<br /><br />An sql error occurred while fetching this page. Please contact an administrator if this problem persists.';
-				}
-				else
-				{
-					if (!empty($config['board_contact']))
-					{
-						$message .= '<br /><br />' . sprintf($user->lang['SQL_ERROR_OCCURRED'], '<a href="mailto:' . htmlspecialchars($config['board_contact']) . '">', '</a>');
-					}
-					else
-					{
-						$message .= '<br /><br />' . sprintf($user->lang['SQL_ERROR_OCCURRED'], '', '');
-					}
-				}
-			}
-
-			if ($this->transaction)
-			{
-				$this->sql_transaction('rollback');
-			}
-
-			if (strlen($message) > 1024)
-			{
-				// We need to define $msg_long_text here to circumvent text stripping.
-				global $msg_long_text;
-				$msg_long_text = $message;
-
-				trigger_error(false, E_USER_ERROR);
-			}
-
-			trigger_error($message, E_USER_ERROR);
-		}
-
-		if ($this->transaction)
-		{
-			$this->sql_transaction('rollback');
-		}
-
-		return $this->sql_error_returned;
-	}
-
-	/**
-	* Explain queries
-	*/
-	function sql_report($mode, $query = '')
-	{
-		global $cache, $starttime, $phpbb_root_path, $phpbb_admin_path, $user;
-		global $request;
-
-		if (is_object($request) && !$request->variable('explain', false))
-		{
-			return false;
-		}
-
-		if (!$query && $this->query_hold != '')
-		{
-			$query = $this->query_hold;
-		}
-
-		switch ($mode)
-		{
-			case 'display':
-				if (!empty($cache))
-				{
-					$cache->unload();
-				}
-				$this->sql_close();
-
-				$mtime = explode(' ', microtime());
-				$totaltime = $mtime[0] + $mtime[1] - $starttime;
-
-				echo '<!DOCTYPE html>
-					<html dir="ltr">
-					<head>
-						<meta charset="utf-8">
-						<title>SQL Report</title>
-						<link href="' . htmlspecialchars($phpbb_admin_path) . 'style/admin.css" rel="stylesheet" type="text/css" media="screen" />
-					</head>
-					<body id="errorpage">
-					<div id="wrap">
-						<div id="page-header">
-							<a href="' . build_url('explain') . '">Return to previous page</a>
-						</div>
-						<div id="page-body">
-							<div id="acp">
-							<div class="panel">
-								<span class="corners-top"><span></span></span>
-								<div id="content">
-									<h1>SQL Report</h1>
-									<br />
-									<p><b>Page generated in ' . round($totaltime, 4) . " seconds with {$this->num_queries['normal']} queries" . (($this->num_queries['cached']) ? " + {$this->num_queries['cached']} " . (($this->num_queries['cached'] == 1) ? 'query' : 'queries') . ' returning data from cache' : '') . '</b></p>
-
-									<p>Time spent on ' . $this->sql_layer . ' queries: <b>' . round($this->sql_time, 5) . 's</b> | Time spent on PHP: <b>' . round($totaltime - $this->sql_time, 5) . 's</b></p>
-
-									<br /><br />
-									' . $this->sql_report . '
-								</div>
-								<span class="corners-bottom"><span></span></span>
-							</div>
-							</div>
-						</div>
-						<div id="page-footer">
-							Powered by <a href="http://www.phpbb.com/">phpBB</a>&reg; Forum Software &copy; phpBB Group
-						</div>
-					</div>
-					</body>
-					</html>';
-
-				exit_handler();
-
-			break;
-
-			case 'stop':
-				$endtime = explode(' ', microtime());
-				$endtime = $endtime[0] + $endtime[1];
-
-				$this->sql_report .= '
-
-					<table cellspacing="1">
-					<thead>
-					<tr>
-						<th>Query #' . $this->num_queries['total'] . '</th>
-					</tr>
-					</thead>
-					<tbody>
-					<tr>
-						<td class="row3"><textarea style="font-family:\'Courier New\',monospace;width:99%" rows="5" cols="10">' . preg_replace('/\t(AND|OR)(\W)/', "\$1\$2", htmlspecialchars(preg_replace('/[\s]*[\n\r\t]+[\n\r\s\t]*/', "\n", $query))) . '</textarea></td>
-					</tr>
-					</tbody>
-					</table>
-
-					' . $this->html_hold . '
-
-					<p style="text-align: center;">
-				';
-
-				if ($this->query_result)
-				{
-					if (preg_match('/^(UPDATE|DELETE|REPLACE)/', $query))
-					{
-						$this->sql_report .= 'Affected rows: <b>' . $this->sql_affectedrows($this->query_result) . '</b> | ';
-					}
-					$this->sql_report .= 'Before: ' . sprintf('%.5f', $this->curtime - $starttime) . 's | After: ' . sprintf('%.5f', $endtime - $starttime) . 's | Elapsed: <b>' . sprintf('%.5f', $endtime - $this->curtime) . 's</b>';
-				}
-				else
-				{
-					$error = $this->sql_error();
-					$this->sql_report .= '<b style="color: red">FAILED</b> - ' . $this->sql_layer . ' Error ' . $error['code'] . ': ' . htmlspecialchars($error['message']);
-				}
-
-				$this->sql_report .= '</p><br /><br />';
-
-				$this->sql_time += $endtime - $this->curtime;
-			break;
-
-			case 'start':
-				$this->query_hold = $query;
-				$this->html_hold = '';
-
-				$this->_sql_report($mode, $query);
-
-				$this->curtime = explode(' ', microtime());
-				$this->curtime = $this->curtime[0] + $this->curtime[1];
-
-			break;
-
-			case 'add_select_row':
-
-				$html_table = func_get_arg(2);
-				$row = func_get_arg(3);
-
-				if (!$html_table && sizeof($row))
-				{
-					$html_table = true;
-					$this->html_hold .= '<table cellspacing="1"><tr>';
-
-					foreach (array_keys($row) as $val)
-					{
-						$this->html_hold .= '<th>' . (($val) ? ucwords(str_replace('_', ' ', $val)) : '&nbsp;') . '</th>';
-					}
-					$this->html_hold .= '</tr>';
-				}
-				$this->html_hold .= '<tr>';
-
-				$class = 'row1';
-				foreach (array_values($row) as $val)
-				{
-					$class = ($class == 'row1') ? 'row2' : 'row1';
-					$this->html_hold .= '<td class="' . $class . '">' . (($val) ? $val : '&nbsp;') . '</td>';
-				}
-				$this->html_hold .= '</tr>';
-
-				return $html_table;
-
-			break;
-
-			case 'fromcache':
-
-				$this->_sql_report($mode, $query);
-
-			break;
-
-			case 'record_fromcache':
-
-				$endtime = func_get_arg(2);
-				$splittime = func_get_arg(3);
-
-				$time_cache = $endtime - $this->curtime;
-				$time_db = $splittime - $endtime;
-				$color = ($time_db > $time_cache) ? 'green' : 'red';
-
-				$this->sql_report .= '<table cellspacing="1"><thead><tr><th>Query results obtained from the cache</th></tr></thead><tbody><tr>';
-				$this->sql_report .= '<td class="row3"><textarea style="font-family:\'Courier New\',monospace;width:99%" rows="5" cols="10">' . preg_replace('/\t(AND|OR)(\W)/', "\$1\$2", htmlspecialchars(preg_replace('/[\s]*[\n\r\t]+[\n\r\s\t]*/', "\n", $query))) . '</textarea></td></tr></tbody></table>';
-				$this->sql_report .= '<p style="text-align: center;">';
-				$this->sql_report .= 'Before: ' . sprintf('%.5f', $this->curtime - $starttime) . 's | After: ' . sprintf('%.5f', $endtime - $starttime) . 's | Elapsed [cache]: <b style="color: ' . $color . '">' . sprintf('%.5f', ($time_cache)) . 's</b> | Elapsed [db]: <b>' . sprintf('%.5f', $time_db) . 's</b></p><br /><br />';
-
-				// Pad the start time to not interfere with page timing
-				$starttime += $time_db;
-
-			break;
-
-			default:
-
-				$this->_sql_report($mode, $query);
-
-			break;
-		}
-
-		return true;
-	}
-
-	/**
-	* Gets the estimated number of rows in a specified table.
-	*
-	* @param string $table_name		Table name
-	*
-	* @return string				Number of rows in $table_name.
-	*								Prefixed with ~ if estimated (otherwise exact).
-	*
-	* @access public
-	*/
-	function get_estimated_row_count($table_name)
-	{
-		return $this->get_row_count($table_name);
-	}
-
-	/**
-	* Gets the exact number of rows in a specified table.
-	*
-	* @param string $table_name		Table name
-	*
-	* @return string				Exact number of rows in $table_name.
-	*
-	* @access public
-	*/
-	function get_row_count($table_name)
-	{
-		$sql = 'SELECT COUNT(*) AS rows_total
-			FROM ' . $this->sql_escape($table_name);
-		$result = $this->sql_query($sql);
-		$rows_total = $this->sql_fetchfield('rows_total');
-		$this->sql_freeresult($result);
-
-		return $rows_total;
-	}
-}
diff --git a/phpBB/includes/db/driver/firebird.php b/phpBB/includes/db/driver/firebird.php
deleted file mode 100644
index 787c28b812..0000000000
--- a/phpBB/includes/db/driver/firebird.php
+++ /dev/null
@@ -1,538 +0,0 @@
-<?php
-/**
-*
-* @package dbal
-* @copyright (c) 2005 phpBB Group
-* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
-*
-*/
-
-/**
-* @ignore
-*/
-if (!defined('IN_PHPBB'))
-{
-	exit;
-}
-
-/**
-* Firebird/Interbase Database Abstraction Layer
-* Minimum Requirement is Firebird 2.1
-* @package dbal
-*/
-class phpbb_db_driver_firebird extends phpbb_db_driver
-{
-	var $last_query_text = '';
-	var $service_handle = false;
-	var $affected_rows = 0;
-	var $connect_error = '';
-
-	/**
-	* Connect to server
-	*/
-	function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false)
-	{
-		$this->persistency = $persistency;
-		$this->user = $sqluser;
-		$this->server = $sqlserver . (($port) ? ':' . $port : '');
-		$this->dbname = str_replace('\\', '/', $database);
-
-		// There are three possibilities to connect to an interbase db
-		if (!$this->server)
-		{
-			$use_database = $this->dbname;
-		}
-		else if (strpos($this->server, '//') === 0)
-		{
-			$use_database = $this->server . $this->dbname;
-		}
-		else
-		{
-			$use_database = $this->server . ':' . $this->dbname;
-		}
-
-		if ($this->persistency)
-		{
-			if (!function_exists('ibase_pconnect'))
-			{
-				$this->connect_error = 'ibase_pconnect function does not exist, is interbase extension installed?';
-				return $this->sql_error('');
-			}
-			$this->db_connect_id = @ibase_pconnect($use_database, $this->user, $sqlpassword, false, false, 3);
-		}
-		else
-		{
-			if (!function_exists('ibase_connect'))
-			{
-				$this->connect_error = 'ibase_connect function does not exist, is interbase extension installed?';
-				return $this->sql_error('');
-			}
-			$this->db_connect_id = @ibase_connect($use_database, $this->user, $sqlpassword, false, false, 3);
-		}
-
-		// Do not call ibase_service_attach if connection failed,
-		// otherwise error message from ibase_(p)connect call will be clobbered.
-		if ($this->db_connect_id && function_exists('ibase_service_attach') && $this->server)
-		{
-			$this->service_handle = @ibase_service_attach($this->server, $this->user, $sqlpassword);
-		}
-		else
-		{
-			$this->service_handle = false;
-		}
-
-		return ($this->db_connect_id) ? $this->db_connect_id : $this->sql_error('');
-	}
-
-	/**
-	* Version information about used database
-	* @param bool $raw if true, only return the fetched sql_server_version
-	* @param bool $use_cache forced to false for Interbase
-	* @return string sql server version
-	*/
-	function sql_server_info($raw = false, $use_cache = true)
-	{
-		/**
-		* force $use_cache false.  I didn't research why the caching code there is no caching code
-		* but I assume its because the IB extension provides a direct method to access it
-		* without a query.
-		*/
-
-		$use_cache = false;
-
-		if ($this->service_handle !== false && function_exists('ibase_server_info'))
-		{
-			return @ibase_server_info($this->service_handle, IBASE_SVC_SERVER_VERSION);
-		}
-
-		return ($raw) ? '2.1' : 'Firebird/Interbase';
-	}
-
-	/**
-	* SQL Transaction
-	* @access private
-	*/
-	function _sql_transaction($status = 'begin')
-	{
-		switch ($status)
-		{
-			case 'begin':
-				return true;
-			break;
-
-			case 'commit':
-				return @ibase_commit();
-			break;
-
-			case 'rollback':
-				return @ibase_rollback();
-			break;
-		}
-
-		return true;
-	}
-
-	/**
-	* Base query method
-	*
-	* @param	string	$query		Contains the SQL query which shall be executed
-	* @param	int		$cache_ttl	Either 0 to avoid caching or the time in seconds which the result shall be kept in cache
-	* @return	mixed				When casted to bool the returned value returns true on success and false on failure
-	*
-	* @access	public
-	*/
-	function sql_query($query = '', $cache_ttl = 0)
-	{
-		if ($query != '')
-		{
-			global $cache;
-
-			// EXPLAIN only in extra debug mode
-			if (defined('DEBUG'))
-			{
-				$this->sql_report('start', $query);
-			}
-
-			$this->last_query_text = $query;
-			$this->query_result = ($cache && $cache_ttl) ? $cache->sql_load($query) : false;
-			$this->sql_add_num_queries($this->query_result);
-
-			if ($this->query_result === false)
-			{
-				$array = array();
-				// We overcome Firebird's 32767 char limit by binding vars
-				if (strlen($query) > 32767)
-				{
-					if (preg_match('/^(INSERT INTO[^(]++)\\(([^()]+)\\) VALUES[^(]++\\((.*?)\\)$/s', $query, $regs))
-					{
-						if (strlen($regs[3]) > 32767)
-						{
-							preg_match_all('/\'(?:[^\']++|\'\')*+\'|[\d-.]+/', $regs[3], $vals, PREG_PATTERN_ORDER);
-
-							$inserts = $vals[0];
-							unset($vals);
-
-							foreach ($inserts as $key => $value)
-							{
-								if (!empty($value) && $value[0] === "'" && strlen($value) > 32769) // check to see if this thing is greater than the max + 'x2
-								{
-									$inserts[$key] = '?';
-									$array[] = str_replace("''", "'", substr($value, 1, -1));
-								}
-							}
-
-							$query = $regs[1] . '(' . $regs[2] . ') VALUES (' . implode(', ', $inserts) . ')';
-						}
-					}
-					else if (preg_match('/^(UPDATE ([\\w_]++)\\s+SET )([\\w_]++\\s*=\\s*(?:\'(?:[^\']++|\'\')*+\'|\\d+)(?:,\\s*[\\w_]++\\s*=\\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]+))*+)\\s+(WHERE.*)$/s', $query, $data))
-					{
-						if (strlen($data[3]) > 32767)
-						{
-							$update = $data[1];
-							$where = $data[4];
-							preg_match_all('/(\\w++)\\s*=\\s*(\'(?:[^\']++|\'\')*+\'|[\d-.]++)/', $data[3], $temp, PREG_SET_ORDER);
-							unset($data);
-
-							$cols = array();
-							foreach ($temp as $value)
-							{
-								if (!empty($value[2]) && $value[2][0] === "'" && strlen($value[2]) > 32769) // check to see if this thing is greater than the max + 'x2
-								{
-									$array[] = str_replace("''", "'", substr($value[2], 1, -1));
-									$cols[] = $value[1] . '=?';
-								}
-								else
-								{
-									$cols[] = $value[1] . '=' . $value[2];
-								}
-							}
-
-							$query = $update . implode(', ', $cols) . ' ' . $where;
-							unset($cols);
-						}
-					}
-				}
-
-				if (!function_exists('ibase_affected_rows') && (preg_match('/^UPDATE ([\w_]++)\s+SET [\w_]++\s*=\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]+)(?:,\s*[\w_]++\s*=\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]+))*+\s+(WHERE.*)?$/s', $query, $regs) || preg_match('/^DELETE FROM ([\w_]++)\s*(WHERE\s*.*)?$/s', $query, $regs)))
-				{
-					$affected_sql = 'SELECT COUNT(*) as num_rows_affected FROM ' . $regs[1];
-					if (!empty($regs[2]))
-					{
-						$affected_sql .= ' ' . $regs[2];
-					}
-
-					if (!($temp_q_id = @ibase_query($this->db_connect_id, $affected_sql)))
-					{
-						return false;
-					}
-
-					$temp_result = @ibase_fetch_assoc($temp_q_id);
-					@ibase_free_result($temp_q_id);
-
-					$this->affected_rows = ($temp_result) ? $temp_result['NUM_ROWS_AFFECTED'] : false;
-				}
-
-				if (sizeof($array))
-				{
-					$p_query = @ibase_prepare($this->db_connect_id, $query);
-					array_unshift($array, $p_query);
-					$this->query_result = call_user_func_array('ibase_execute', $array);
-					unset($array);
-
-					if ($this->query_result === false)
-					{
-						$this->sql_error($query);
-					}
-				}
-				else if (($this->query_result = @ibase_query($this->db_connect_id, $query)) === false)
-				{
-					$this->sql_error($query);
-				}
-
-				if (defined('DEBUG'))
-				{
-					$this->sql_report('stop', $query);
-				}
-
-				if (!$this->transaction)
-				{
-					if (function_exists('ibase_commit_ret'))
-					{
-						@ibase_commit_ret();
-					}
-					else
-					{
-						// way cooler than ibase_commit_ret :D
-						@ibase_query('COMMIT RETAIN;');
-					}
-				}
-
-				if ($cache && $cache_ttl)
-				{
-					$this->open_queries[(int) $this->query_result] = $this->query_result;
-					$this->query_result = $cache->sql_save($this, $query, $this->query_result, $cache_ttl);
-				}
-				else if (strpos($query, 'SELECT') === 0 && $this->query_result)
-				{
-					$this->open_queries[(int) $this->query_result] = $this->query_result;
-				}
-			}
-			else if (defined('DEBUG'))
-			{
-				$this->sql_report('fromcache', $query);
-			}
-		}
-		else
-		{
-			return false;
-		}
-
-		return $this->query_result;
-	}
-
-	/**
-	* Build LIMIT query
-	*/
-	function _sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)
-	{
-		$this->query_result = false;
-
-		$query = 'SELECT FIRST ' . $total . ((!empty($offset)) ? ' SKIP ' . $offset : '') . substr($query, 6);
-
-		return $this->sql_query($query, $cache_ttl);
-	}
-
-	/**
-	* Return number of affected rows
-	*/
-	function sql_affectedrows()
-	{
-		// PHP 5+ function
-		if (function_exists('ibase_affected_rows'))
-		{
-			return ($this->db_connect_id) ? @ibase_affected_rows($this->db_connect_id) : false;
-		}
-		else
-		{
-			return $this->affected_rows;
-		}
-	}
-
-	/**
-	* Fetch current row
-	*/
-	function sql_fetchrow($query_id = false)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache && $cache->sql_exists($query_id))
-		{
-			return $cache->sql_fetchrow($query_id);
-		}
-
-		if ($query_id === false)
-		{
-			return false;
-		}
-
-		$row = array();
-		$cur_row = @ibase_fetch_object($query_id, IBASE_TEXT);
-
-		if (!$cur_row)
-		{
-			return false;
-		}
-
-		foreach (get_object_vars($cur_row) as $key => $value)
-		{
-			$row[strtolower($key)] = (is_string($value)) ? trim(str_replace(array("\\0", "\\n"), array("\0", "\n"), $value)) : $value;
-		}
-
-		return (sizeof($row)) ? $row : false;
-	}
-
-	/**
-	* Get last inserted id after insert statement
-	*/
-	function sql_nextid()
-	{
-		$query_id = $this->query_result;
-
-		if ($query_id !== false && $this->last_query_text != '')
-		{
-			if ($this->query_result && preg_match('#^INSERT[\t\n ]+INTO[\t\n ]+([a-z0-9\_\-]+)#i', $this->last_query_text, $tablename))
-			{
-				$sql = 'SELECT GEN_ID(' . $tablename[1] . '_gen, 0) AS new_id FROM RDB$DATABASE';
-
-				if (!($temp_q_id = @ibase_query($this->db_connect_id, $sql)))
-				{
-					return false;
-				}
-
-				$temp_result = @ibase_fetch_assoc($temp_q_id);
-				@ibase_free_result($temp_q_id);
-
-				return ($temp_result) ? $temp_result['NEW_ID'] : false;
-			}
-		}
-
-		return false;
-	}
-
-	/**
-	* Free sql result
-	*/
-	function sql_freeresult($query_id = false)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache && $cache->sql_exists($query_id))
-		{
-			return $cache->sql_freeresult($query_id);
-		}
-
-		if (isset($this->open_queries[(int) $query_id]))
-		{
-			unset($this->open_queries[(int) $query_id]);
-			return @ibase_free_result($query_id);
-		}
-
-		return false;
-	}
-
-	/**
-	* Escape string used in sql query
-	*/
-	function sql_escape($msg)
-	{
-		return str_replace(array("'", "\0"), array("''", ''), $msg);
-	}
-
-	/**
-	* Build LIKE expression
-	* @access private
-	*/
-	function _sql_like_expression($expression)
-	{
-		return $expression . " ESCAPE '\\'";
-	}
-
-	/**
-	* Build db-specific query data
-	* @access private
-	*/
-	function _sql_custom_build($stage, $data)
-	{
-		return $data;
-	}
-
-	function _sql_bit_and($column_name, $bit, $compare = '')
-	{
-		return 'BIN_AND(' . $column_name . ', ' . (1 << $bit) . ')' . (($compare) ? ' ' . $compare : '');
-	}
-
-	function _sql_bit_or($column_name, $bit, $compare = '')
-	{
-		return 'BIN_OR(' . $column_name . ', ' . (1 << $bit) . ')' . (($compare) ? ' ' . $compare : '');
-	}
-
-	/**
-	* @inheritdoc
-	*/
-	function cast_expr_to_bigint($expression)
-	{
-		// Precision must be from 1 to 18
-		return 'CAST(' . $expression . ' as DECIMAL(18, 0))';
-	}
-
-	/**
-	* @inheritdoc
-	*/
-	function cast_expr_to_string($expression)
-	{
-		return 'CAST(' . $expression . ' as VARCHAR(255))';
-	}
-
-	/**
-	* return sql error array
-	* @access private
-	*/
-	function _sql_error()
-	{
-		// Need special handling here because ibase_errmsg returns
-		// connection errors, however if the interbase extension
-		// is not installed then ibase_errmsg does not exist and
-		// we cannot call it.
-		if (function_exists('ibase_errmsg'))
-		{
-			$msg = @ibase_errmsg();
-			if (!$msg)
-			{
-				$msg = $this->connect_error;
-			}
-		}
-		else
-		{
-			$msg = $this->connect_error;
-		}
-		return array(
-			'message'	=> $msg,
-			'code'		=> (@function_exists('ibase_errcode') ? @ibase_errcode() : '')
-		);
-	}
-
-	/**
-	* Close sql connection
-	* @access private
-	*/
-	function _sql_close()
-	{
-		if ($this->service_handle !== false)
-		{
-			@ibase_service_detach($this->service_handle);
-		}
-
-		return @ibase_close($this->db_connect_id);
-	}
-
-	/**
-	* Build db-specific report
-	* @access private
-	*/
-	function _sql_report($mode, $query = '')
-	{
-		switch ($mode)
-		{
-			case 'start':
-			break;
-
-			case 'fromcache':
-				$endtime = explode(' ', microtime());
-				$endtime = $endtime[0] + $endtime[1];
-
-				$result = @ibase_query($this->db_connect_id, $query);
-				while ($void = @ibase_fetch_object($result, IBASE_TEXT))
-				{
-					// Take the time spent on parsing rows into account
-				}
-				@ibase_free_result($result);
-
-				$splittime = explode(' ', microtime());
-				$splittime = $splittime[0] + $splittime[1];
-
-				$this->sql_report('record_fromcache', $query, $endtime, $splittime);
-
-			break;
-		}
-	}
-}
diff --git a/phpBB/includes/db/driver/mssql.php b/phpBB/includes/db/driver/mssql.php
deleted file mode 100644
index 89c2c2351b..0000000000
--- a/phpBB/includes/db/driver/mssql.php
+++ /dev/null
@@ -1,472 +0,0 @@
-<?php
-/**
-*
-* @package dbal
-* @copyright (c) 2005 phpBB Group
-* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
-*
-*/
-
-/**
-* @ignore
-*/
-if (!defined('IN_PHPBB'))
-{
-	exit;
-}
-
-/**
-* MSSQL Database Abstraction Layer
-* Minimum Requirement is MSSQL 2000+
-* @package dbal
-*/
-class phpbb_db_driver_mssql extends phpbb_db_driver
-{
-	var $connect_error = '';
-
-	/**
-	* Connect to server
-	*/
-	function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false)
-	{
-		if (!function_exists('mssql_connect'))
-		{
-			$this->connect_error = 'mssql_connect function does not exist, is mssql extension installed?';
-			return $this->sql_error('');
-		}
-
-		$this->persistency = $persistency;
-		$this->user = $sqluser;
-		$this->dbname = $database;
-
-		$port_delimiter = (defined('PHP_OS') && substr(PHP_OS, 0, 3) === 'WIN') ? ',' : ':';
-		$this->server = $sqlserver . (($port) ? $port_delimiter . $port : '');
-
-		@ini_set('mssql.charset', 'UTF-8');
-		@ini_set('mssql.textlimit', 2147483647);
-		@ini_set('mssql.textsize', 2147483647);
-
-		$this->db_connect_id = ($this->persistency) ? @mssql_pconnect($this->server, $this->user, $sqlpassword, $new_link) : @mssql_connect($this->server, $this->user, $sqlpassword, $new_link);
-
-		if ($this->db_connect_id && $this->dbname != '')
-		{
-			if (!@mssql_select_db($this->dbname, $this->db_connect_id))
-			{
-				@mssql_close($this->db_connect_id);
-				return false;
-			}
-		}
-
-		return ($this->db_connect_id) ? $this->db_connect_id : $this->sql_error('');
-	}
-
-	/**
-	* Version information about used database
-	* @param bool $raw if true, only return the fetched sql_server_version
-	* @param bool $use_cache If true, it is safe to retrieve the value from the cache
-	* @return string sql server version
-	*/
-	function sql_server_info($raw = false, $use_cache = true)
-	{
-		global $cache;
-
-		if (!$use_cache || empty($cache) || ($this->sql_server_version = $cache->get('mssql_version')) === false)
-		{
-			$result_id = @mssql_query("SELECT SERVERPROPERTY('productversion'), SERVERPROPERTY('productlevel'), SERVERPROPERTY('edition')", $this->db_connect_id);
-
-			$row = false;
-			if ($result_id)
-			{
-				$row = @mssql_fetch_assoc($result_id);
-				@mssql_free_result($result_id);
-			}
-
-			$this->sql_server_version = ($row) ? trim(implode(' ', $row)) : 0;
-
-			if (!empty($cache) && $use_cache)
-			{
-				$cache->put('mssql_version', $this->sql_server_version);
-			}
-		}
-
-		if ($raw)
-		{
-			return $this->sql_server_version;
-		}
-
-		return ($this->sql_server_version) ? 'MSSQL<br />' . $this->sql_server_version : 'MSSQL';
-	}
-
-	/**
-	* {@inheritDoc}
-	*/
-	public function sql_concatenate($expr1, $expr2)
-	{
-		return $expr1 . ' + ' . $expr2;
-	}
-
-	/**
-	* SQL Transaction
-	* @access private
-	*/
-	function _sql_transaction($status = 'begin')
-	{
-		switch ($status)
-		{
-			case 'begin':
-				return @mssql_query('BEGIN TRANSACTION', $this->db_connect_id);
-			break;
-
-			case 'commit':
-				return @mssql_query('COMMIT TRANSACTION', $this->db_connect_id);
-			break;
-
-			case 'rollback':
-				return @mssql_query('ROLLBACK TRANSACTION', $this->db_connect_id);
-			break;
-		}
-
-		return true;
-	}
-
-	/**
-	* Base query method
-	*
-	* @param	string	$query		Contains the SQL query which shall be executed
-	* @param	int		$cache_ttl	Either 0 to avoid caching or the time in seconds which the result shall be kept in cache
-	* @return	mixed				When casted to bool the returned value returns true on success and false on failure
-	*
-	* @access	public
-	*/
-	function sql_query($query = '', $cache_ttl = 0)
-	{
-		if ($query != '')
-		{
-			global $cache;
-
-			// EXPLAIN only in extra debug mode
-			if (defined('DEBUG'))
-			{
-				$this->sql_report('start', $query);
-			}
-
-			$this->query_result = ($cache && $cache_ttl) ? $cache->sql_load($query) : false;
-			$this->sql_add_num_queries($this->query_result);
-
-			if ($this->query_result === false)
-			{
-				if (($this->query_result = @mssql_query($query, $this->db_connect_id)) === false)
-				{
-					$this->sql_error($query);
-				}
-
-				if (defined('DEBUG'))
-				{
-					$this->sql_report('stop', $query);
-				}
-
-				if ($cache && $cache_ttl)
-				{
-					$this->open_queries[(int) $this->query_result] = $this->query_result;
-					$this->query_result = $cache->sql_save($this, $query, $this->query_result, $cache_ttl);
-				}
-				else if (strpos($query, 'SELECT') === 0 && $this->query_result)
-				{
-					$this->open_queries[(int) $this->query_result] = $this->query_result;
-				}
-			}
-			else if (defined('DEBUG'))
-			{
-				$this->sql_report('fromcache', $query);
-			}
-		}
-		else
-		{
-			return false;
-		}
-
-		return $this->query_result;
-	}
-
-	/**
-	* Build LIMIT query
-	*/
-	function _sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)
-	{
-		$this->query_result = false;
-
-		// Since TOP is only returning a set number of rows we won't need it if total is set to 0 (return all rows)
-		if ($total)
-		{
-			// We need to grab the total number of rows + the offset number of rows to get the correct result
-			if (strpos($query, 'SELECT DISTINCT') === 0)
-			{
-				$query = 'SELECT DISTINCT TOP ' . ($total + $offset) . ' ' . substr($query, 15);
-			}
-			else
-			{
-				$query = 'SELECT TOP ' . ($total + $offset) . ' ' . substr($query, 6);
-			}
-		}
-
-		$result = $this->sql_query($query, $cache_ttl);
-
-		// Seek by $offset rows
-		if ($offset)
-		{
-			$this->sql_rowseek($offset, $result);
-		}
-
-		return $result;
-	}
-
-	/**
-	* Return number of affected rows
-	*/
-	function sql_affectedrows()
-	{
-		return ($this->db_connect_id) ? @mssql_rows_affected($this->db_connect_id) : false;
-	}
-
-	/**
-	* Fetch current row
-	*/
-	function sql_fetchrow($query_id = false)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache && $cache->sql_exists($query_id))
-		{
-			return $cache->sql_fetchrow($query_id);
-		}
-
-		if ($query_id === false)
-		{
-			return false;
-		}
-
-		$row = @mssql_fetch_assoc($query_id);
-
-		// I hope i am able to remove this later... hopefully only a PHP or MSSQL bug
-		if ($row)
-		{
-			foreach ($row as $key => $value)
-			{
-				$row[$key] = ($value === ' ' || $value === NULL) ? '' : $value;
-			}
-		}
-
-		return $row;
-	}
-
-	/**
-	* Seek to given row number
-	* rownum is zero-based
-	*/
-	function sql_rowseek($rownum, &$query_id)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache && $cache->sql_exists($query_id))
-		{
-			return $cache->sql_rowseek($rownum, $query_id);
-		}
-
-		return ($query_id !== false) ? @mssql_data_seek($query_id, $rownum) : false;
-	}
-
-	/**
-	* Get last inserted id after insert statement
-	*/
-	function sql_nextid()
-	{
-		$result_id = @mssql_query('SELECT SCOPE_IDENTITY()', $this->db_connect_id);
-		if ($result_id)
-		{
-			if ($row = @mssql_fetch_assoc($result_id))
-			{
-				@mssql_free_result($result_id);
-				return $row['computed'];
-			}
-			@mssql_free_result($result_id);
-		}
-
-		return false;
-	}
-
-	/**
-	* Free sql result
-	*/
-	function sql_freeresult($query_id = false)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache && $cache->sql_exists($query_id))
-		{
-			return $cache->sql_freeresult($query_id);
-		}
-
-		if (isset($this->open_queries[$query_id]))
-		{
-			unset($this->open_queries[$query_id]);
-			return @mssql_free_result($query_id);
-		}
-
-		return false;
-	}
-
-	/**
-	* Escape string used in sql query
-	*/
-	function sql_escape($msg)
-	{
-		return str_replace(array("'", "\0"), array("''", ''), $msg);
-	}
-
-	/**
-	* {@inheritDoc}
-	*/
-	function sql_lower_text($column_name)
-	{
-		return "LOWER(SUBSTRING($column_name, 1, DATALENGTH($column_name)))";
-	}
-
-	/**
-	* Build LIKE expression
-	* @access private
-	*/
-	function _sql_like_expression($expression)
-	{
-		return $expression . " ESCAPE '\\'";
-	}
-
-	/**
-	* return sql error array
-	* @access private
-	*/
-	function _sql_error()
-	{
-		if (function_exists('mssql_get_last_message'))
-		{
-			$error = array(
-				'message'	=> @mssql_get_last_message(),
-				'code'		=> '',
-			);
-
-			// Get error code number
-			$result_id = @mssql_query('SELECT @@ERROR as code', $this->db_connect_id);
-			if ($result_id)
-			{
-				$row = @mssql_fetch_assoc($result_id);
-				$error['code'] = $row['code'];
-				@mssql_free_result($result_id);
-			}
-
-			// Get full error message if possible
-			$sql = 'SELECT CAST(description as varchar(255)) as message
-				FROM master.dbo.sysmessages
-				WHERE error = ' . $error['code'];
-			$result_id = @mssql_query($sql);
-
-			if ($result_id)
-			{
-				$row = @mssql_fetch_assoc($result_id);
-				if (!empty($row['message']))
-				{
-					$error['message'] .= '<br />' . $row['message'];
-				}
-				@mssql_free_result($result_id);
-			}
-		}
-		else
-		{
-			$error = array(
-				'message'	=> $this->connect_error,
-				'code'		=> '',
-			);
-		}
-
-		return $error;
-	}
-
-	/**
-	* Build db-specific query data
-	* @access private
-	*/
-	function _sql_custom_build($stage, $data)
-	{
-		return $data;
-	}
-
-	/**
-	* Close sql connection
-	* @access private
-	*/
-	function _sql_close()
-	{
-		return @mssql_close($this->db_connect_id);
-	}
-
-	/**
-	* Build db-specific report
-	* @access private
-	*/
-	function _sql_report($mode, $query = '')
-	{
-		switch ($mode)
-		{
-			case 'start':
-				$html_table = false;
-				@mssql_query('SET SHOWPLAN_TEXT ON;', $this->db_connect_id);
-				if ($result = @mssql_query($query, $this->db_connect_id))
-				{
-					@mssql_next_result($result);
-					while ($row = @mssql_fetch_row($result))
-					{
-						$html_table = $this->sql_report('add_select_row', $query, $html_table, $row);
-					}
-				}
-				@mssql_query('SET SHOWPLAN_TEXT OFF;', $this->db_connect_id);
-				@mssql_free_result($result);
-
-				if ($html_table)
-				{
-					$this->html_hold .= '</table>';
-				}
-			break;
-
-			case 'fromcache':
-				$endtime = explode(' ', microtime());
-				$endtime = $endtime[0] + $endtime[1];
-
-				$result = @mssql_query($query, $this->db_connect_id);
-				while ($void = @mssql_fetch_assoc($result))
-				{
-					// Take the time spent on parsing rows into account
-				}
-				@mssql_free_result($result);
-
-				$splittime = explode(' ', microtime());
-				$splittime = $splittime[0] + $splittime[1];
-
-				$this->sql_report('record_fromcache', $query, $endtime, $splittime);
-
-			break;
-		}
-	}
-}
diff --git a/phpBB/includes/db/driver/mssql_base.php b/phpBB/includes/db/driver/mssql_base.php
deleted file mode 100644
index 56c111c871..0000000000
--- a/phpBB/includes/db/driver/mssql_base.php
+++ /dev/null
@@ -1,65 +0,0 @@
-<?php
-/**
-*
-* @package dbal
-* @copyright (c) 2013 phpBB Group
-* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
-*
-*/
-
-/**
-* @ignore
-*/
-if (!defined('IN_PHPBB'))
-{
-	exit;
-}
-
-/**
-* MSSQL Database Base Abstraction Layer
-* @package dbal
- */
-abstract class phpbb_db_driver_mssql_base extends phpbb_db_driver
-{
-	/**
-	* {@inheritDoc}
-	*/
-	public function sql_concatenate($expr1, $expr2)
-	{
-		return $expr1 . ' + ' . $expr2;
-	}
-
-	/**
-	* Escape string used in sql query
-	*/
-	function sql_escape($msg)
-	{
-		return str_replace(array("'", "\0"), array("''", ''), $msg);
-	}
-
-	/**
-	* {@inheritDoc}
-	*/
-	function sql_lower_text($column_name)
-	{
-		return "LOWER(SUBSTRING($column_name, 1, DATALENGTH($column_name)))";
-	}
-
-	/**
-	* Build LIKE expression
-	* @access private
-	*/
-	function _sql_like_expression($expression)
-	{
-		return $expression . " ESCAPE '\\'";
-	}
-
-	/**
-	* Build db-specific query data
-	* @access private
-	*/
-	function _sql_custom_build($stage, $data)
-	{
-		return $data;
-	}
-}
diff --git a/phpBB/includes/db/driver/mssql_odbc.php b/phpBB/includes/db/driver/mssql_odbc.php
deleted file mode 100644
index cde9d332ba..0000000000
--- a/phpBB/includes/db/driver/mssql_odbc.php
+++ /dev/null
@@ -1,383 +0,0 @@
-<?php
-/**
-*
-* @package dbal
-* @copyright (c) 2005 phpBB Group
-* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
-*
-*/
-
-/**
-* @ignore
-*/
-if (!defined('IN_PHPBB'))
-{
-	exit;
-}
-
-/**
-* Unified ODBC functions
-* Unified ODBC functions support any database having ODBC driver, for example Adabas D, IBM DB2, iODBC, Solid, Sybase SQL Anywhere...
-* Here we only support MSSQL Server 2000+ because of the provided schema
-*
-* @note number of bytes returned for returning data depends on odbc.defaultlrl php.ini setting.
-* If it is limited to 4K for example only 4K of data is returned max, resulting in incomplete theme data for example.
-* @note odbc.defaultbinmode may affect UTF8 characters
-*
-* @package dbal
-*/
-class phpbb_db_driver_mssql_odbc extends phpbb_db_driver_mssql_base
-{
-	var $last_query_text = '';
-	var $connect_error = '';
-
-	/**
-	* Connect to server
-	*/
-	function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false)
-	{
-		$this->persistency = $persistency;
-		$this->user = $sqluser;
-		$this->dbname = $database;
-
-		$port_delimiter = (defined('PHP_OS') && substr(PHP_OS, 0, 3) === 'WIN') ? ',' : ':';
-		$this->server = $sqlserver . (($port) ? $port_delimiter . $port : '');
-
-		$max_size = @ini_get('odbc.defaultlrl');
-		if (!empty($max_size))
-		{
-			$unit = strtolower(substr($max_size, -1, 1));
-			$max_size = (int) $max_size;
-
-			if ($unit == 'k')
-			{
-				$max_size = floor($max_size / 1024);
-			}
-			else if ($unit == 'g')
-			{
-				$max_size *= 1024;
-			}
-			else if (is_numeric($unit))
-			{
-				$max_size = floor((int) ($max_size . $unit) / 1048576);
-			}
-			$max_size = max(8, $max_size) . 'M';
-
-			@ini_set('odbc.defaultlrl', $max_size);
-		}
-
-		if ($this->persistency)
-		{
-			if (!function_exists('odbc_pconnect'))
-			{
-				$this->connect_error = 'odbc_pconnect function does not exist, is odbc extension installed?';
-				return $this->sql_error('');
-			}
-			$this->db_connect_id = @odbc_pconnect($this->server, $this->user, $sqlpassword);
-		}
-		else
-		{
-			if (!function_exists('odbc_connect'))
-			{
-				$this->connect_error = 'odbc_connect function does not exist, is odbc extension installed?';
-				return $this->sql_error('');
-			}
-			$this->db_connect_id = @odbc_connect($this->server, $this->user, $sqlpassword);
-		}
-
-		return ($this->db_connect_id) ? $this->db_connect_id : $this->sql_error('');
-	}
-
-	/**
-	* Version information about used database
-	* @param bool $raw if true, only return the fetched sql_server_version
-	* @param bool $use_cache If true, it is safe to retrieve the value from the cache
-	* @return string sql server version
-	*/
-	function sql_server_info($raw = false, $use_cache = true)
-	{
-		global $cache;
-
-		if (!$use_cache || empty($cache) || ($this->sql_server_version = $cache->get('mssqlodbc_version')) === false)
-		{
-			$result_id = @odbc_exec($this->db_connect_id, "SELECT SERVERPROPERTY('productversion'), SERVERPROPERTY('productlevel'), SERVERPROPERTY('edition')");
-
-			$row = false;
-			if ($result_id)
-			{
-				$row = @odbc_fetch_array($result_id);
-				@odbc_free_result($result_id);
-			}
-
-			$this->sql_server_version = ($row) ? trim(implode(' ', $row)) : 0;
-
-			if (!empty($cache) && $use_cache)
-			{
-				$cache->put('mssqlodbc_version', $this->sql_server_version);
-			}
-		}
-
-		if ($raw)
-		{
-			return $this->sql_server_version;
-		}
-
-		return ($this->sql_server_version) ? 'MSSQL (ODBC)<br />' . $this->sql_server_version : 'MSSQL (ODBC)';
-	}
-
-	/**
-	* SQL Transaction
-	* @access private
-	*/
-	function _sql_transaction($status = 'begin')
-	{
-		switch ($status)
-		{
-			case 'begin':
-				return @odbc_exec($this->db_connect_id, 'BEGIN TRANSACTION');
-			break;
-
-			case 'commit':
-				return @odbc_exec($this->db_connect_id, 'COMMIT TRANSACTION');
-			break;
-
-			case 'rollback':
-				return @odbc_exec($this->db_connect_id, 'ROLLBACK TRANSACTION');
-			break;
-		}
-
-		return true;
-	}
-
-	/**
-	* Base query method
-	*
-	* @param	string	$query		Contains the SQL query which shall be executed
-	* @param	int		$cache_ttl	Either 0 to avoid caching or the time in seconds which the result shall be kept in cache
-	* @return	mixed				When casted to bool the returned value returns true on success and false on failure
-	*
-	* @access	public
-	*/
-	function sql_query($query = '', $cache_ttl = 0)
-	{
-		if ($query != '')
-		{
-			global $cache;
-
-			// EXPLAIN only in extra debug mode
-			if (defined('DEBUG'))
-			{
-				$this->sql_report('start', $query);
-			}
-
-			$this->last_query_text = $query;
-			$this->query_result = ($cache && $cache_ttl) ? $cache->sql_load($query) : false;
-			$this->sql_add_num_queries($this->query_result);
-
-			if ($this->query_result === false)
-			{
-				if (($this->query_result = @odbc_exec($this->db_connect_id, $query)) === false)
-				{
-					$this->sql_error($query);
-				}
-
-				if (defined('DEBUG'))
-				{
-					$this->sql_report('stop', $query);
-				}
-
-				if ($cache && $cache_ttl)
-				{
-					$this->open_queries[(int) $this->query_result] = $this->query_result;
-					$this->query_result = $cache->sql_save($this, $query, $this->query_result, $cache_ttl);
-				}
-				else if (strpos($query, 'SELECT') === 0 && $this->query_result)
-				{
-					$this->open_queries[(int) $this->query_result] = $this->query_result;
-				}
-			}
-			else if (defined('DEBUG'))
-			{
-				$this->sql_report('fromcache', $query);
-			}
-		}
-		else
-		{
-			return false;
-		}
-
-		return $this->query_result;
-	}
-
-	/**
-	* Build LIMIT query
-	*/
-	function _sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)
-	{
-		$this->query_result = false;
-
-		// Since TOP is only returning a set number of rows we won't need it if total is set to 0 (return all rows)
-		if ($total)
-		{
-			// We need to grab the total number of rows + the offset number of rows to get the correct result
-			if (strpos($query, 'SELECT DISTINCT') === 0)
-			{
-				$query = 'SELECT DISTINCT TOP ' . ($total + $offset) . ' ' . substr($query, 15);
-			}
-			else
-			{
-				$query = 'SELECT TOP ' . ($total + $offset) . ' ' . substr($query, 6);
-			}
-		}
-
-		$result = $this->sql_query($query, $cache_ttl);
-
-		// Seek by $offset rows
-		if ($offset)
-		{
-			$this->sql_rowseek($offset, $result);
-		}
-
-		return $result;
-	}
-
-	/**
-	* Return number of affected rows
-	*/
-	function sql_affectedrows()
-	{
-		return ($this->db_connect_id) ? @odbc_num_rows($this->query_result) : false;
-	}
-
-	/**
-	* Fetch current row
-	* @note number of bytes returned depends on odbc.defaultlrl php.ini setting. If it is limited to 4K for example only 4K of data is returned max.
-	*/
-	function sql_fetchrow($query_id = false, $debug = false)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache && $cache->sql_exists($query_id))
-		{
-			return $cache->sql_fetchrow($query_id);
-		}
-
-		return ($query_id !== false) ? @odbc_fetch_array($query_id) : false;
-	}
-
-	/**
-	* Get last inserted id after insert statement
-	*/
-	function sql_nextid()
-	{
-		$result_id = @odbc_exec($this->db_connect_id, 'SELECT @@IDENTITY');
-
-		if ($result_id)
-		{
-			if (@odbc_fetch_array($result_id))
-			{
-				$id = @odbc_result($result_id, 1);
-				@odbc_free_result($result_id);
-				return $id;
-			}
-			@odbc_free_result($result_id);
-		}
-
-		return false;
-	}
-
-	/**
-	* Free sql result
-	*/
-	function sql_freeresult($query_id = false)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache && $cache->sql_exists($query_id))
-		{
-			return $cache->sql_freeresult($query_id);
-		}
-
-		if (isset($this->open_queries[(int) $query_id]))
-		{
-			unset($this->open_queries[(int) $query_id]);
-			return @odbc_free_result($query_id);
-		}
-
-		return false;
-	}
-
-	/**
-	* return sql error array
-	* @access private
-	*/
-	function _sql_error()
-	{
-		if (function_exists('odbc_errormsg'))
-		{
-			$error = array(
-				'message'	=> @odbc_errormsg(),
-				'code'		=> @odbc_error(),
-			);
-		}
-		else
-		{
-			$error = array(
-				'message'	=> $this->connect_error,
-				'code'		=> '',
-			);
-		}
-
-		return $error;
-	}
-
-	/**
-	* Close sql connection
-	* @access private
-	*/
-	function _sql_close()
-	{
-		return @odbc_close($this->db_connect_id);
-	}
-
-	/**
-	* Build db-specific report
-	* @access private
-	*/
-	function _sql_report($mode, $query = '')
-	{
-		switch ($mode)
-		{
-			case 'start':
-			break;
-
-			case 'fromcache':
-				$endtime = explode(' ', microtime());
-				$endtime = $endtime[0] + $endtime[1];
-
-				$result = @odbc_exec($this->db_connect_id, $query);
-				while ($void = @odbc_fetch_array($result))
-				{
-					// Take the time spent on parsing rows into account
-				}
-				@odbc_free_result($result);
-
-				$splittime = explode(' ', microtime());
-				$splittime = $splittime[0] + $splittime[1];
-
-				$this->sql_report('record_fromcache', $query, $endtime, $splittime);
-
-			break;
-		}
-	}
-}
diff --git a/phpBB/includes/db/driver/mssqlnative.php b/phpBB/includes/db/driver/mssqlnative.php
deleted file mode 100644
index 6f433e10cf..0000000000
--- a/phpBB/includes/db/driver/mssqlnative.php
+++ /dev/null
@@ -1,613 +0,0 @@
-<?php
-/**
-*
-* @package dbal
-* @copyright (c) 2010 phpBB Group
-* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
-*
-* This is the MS SQL Server Native database abstraction layer.
-* PHP mssql native driver required.
-* @author Chris Pucci
-*
-*/
-
-/**
-* @ignore
-*/
-if (!defined('IN_PHPBB'))
-{
-	exit;
-}
-
-/**
- * Prior to version 1.1 the SQL Server Native PHP driver didn't support sqlsrv_num_rows, or cursor based seeking so we recall all rows into an array
- * and maintain our own cursor index into that array.
- */
-class result_mssqlnative
-{
-	public function result_mssqlnative($queryresult = false)
-	{
-		$this->m_cursor = 0;
-		$this->m_rows = array();
-		$this->m_num_fields = sqlsrv_num_fields($queryresult);
-		$this->m_field_meta = sqlsrv_field_metadata($queryresult);
-
-		while ($row = sqlsrv_fetch_array($queryresult, SQLSRV_FETCH_ASSOC))
-		{
-			if ($row !== null)
-			{
-				foreach($row as $k => $v)
-				{
-					if (is_object($v) && method_exists($v, 'format'))
-					{
-						$row[$k] = $v->format("Y-m-d\TH:i:s\Z");
-					}
-				}
-				$this->m_rows[] = $row;//read results into memory, cursors are not supported
-			}
-		}
-
-		$this->m_row_count = sizeof($this->m_rows);
-	}
-
-	private function array_to_obj($array, &$obj)
-	{
-		foreach ($array as $key => $value)
-		{
-			if (is_array($value))
-			{
-				$obj->$key = new stdClass();
-				array_to_obj($value, $obj->$key);
-			}
-			else
-			{
-				$obj->$key = $value;
-			}
-		}
-		return $obj;
-	}
-
-	public function fetch($mode = SQLSRV_FETCH_BOTH, $object_class = 'stdClass')
-	{
-		if ($this->m_cursor >= $this->m_row_count || $this->m_row_count == 0)
-		{
-			return false;
-		}
-
-		$ret = false;
-		$arr_num = array();
-
-		if ($mode == SQLSRV_FETCH_NUMERIC || $mode == SQLSRV_FETCH_BOTH)
-		{
-			foreach($this->m_rows[$this->m_cursor] as $key => $value)
-			{
-				$arr_num[] = $value;
-			}
-		}
-
-		switch ($mode)
-		{
-			case SQLSRV_FETCH_ASSOC:
-				$ret = $this->m_rows[$this->m_cursor];
-			break;
-			case SQLSRV_FETCH_NUMERIC:
-				$ret = $arr_num;
-			break;
-			case 'OBJECT':
-				$ret = $this->array_to_obj($this->m_rows[$this->m_cursor], $o = new $object_class);
-			break;
-			case SQLSRV_FETCH_BOTH:
-			default:
-				$ret = $this->m_rows[$this->m_cursor] + $arr_num;
-			break;
-		}
-		$this->m_cursor++;
-		return $ret;
-	}
-
-	public function get($pos, $fld)
-	{
-		return $this->m_rows[$pos][$fld];
-	}
-
-	public function num_rows()
-	{
-		return $this->m_row_count;
-	}
-
-	public function seek($iRow)
-	{
-		$this->m_cursor = min($iRow, $this->m_row_count);
-	}
-
-	public function num_fields()
-	{
-		return $this->m_num_fields;
-	}
-
-	public function field_name($nr)
-	{
-		$arr_keys = array_keys($this->m_rows[0]);
-		return $arr_keys[$nr];
-	}
-
-	public function field_type($nr)
-	{
-		$i = 0;
-		$int_type = -1;
-		$str_type = '';
-
-		foreach ($this->m_field_meta as $meta)
-		{
-			if ($nr == $i)
-			{
-				$int_type = $meta['Type'];
-				break;
-			}
-			$i++;
-		}
-
-		//http://msdn.microsoft.com/en-us/library/cc296183.aspx contains type table
-		switch ($int_type)
-		{
-			case SQLSRV_SQLTYPE_BIGINT: 		$str_type = 'bigint'; break;
-			case SQLSRV_SQLTYPE_BINARY: 		$str_type = 'binary'; break;
-			case SQLSRV_SQLTYPE_BIT: 			$str_type = 'bit'; break;
-			case SQLSRV_SQLTYPE_CHAR: 			$str_type = 'char'; break;
-			case SQLSRV_SQLTYPE_DATETIME: 		$str_type = 'datetime'; break;
-			case SQLSRV_SQLTYPE_DECIMAL/*($precision, $scale)*/: $str_type = 'decimal'; break;
-			case SQLSRV_SQLTYPE_FLOAT: 			$str_type = 'float'; break;
-			case SQLSRV_SQLTYPE_IMAGE: 			$str_type = 'image'; break;
-			case SQLSRV_SQLTYPE_INT: 			$str_type = 'int'; break;
-			case SQLSRV_SQLTYPE_MONEY: 			$str_type = 'money'; break;
-			case SQLSRV_SQLTYPE_NCHAR/*($charCount)*/: $str_type = 'nchar'; break;
-			case SQLSRV_SQLTYPE_NUMERIC/*($precision, $scale)*/: $str_type = 'numeric'; break;
-			case SQLSRV_SQLTYPE_NVARCHAR/*($charCount)*/: $str_type = 'nvarchar'; break;
-			case SQLSRV_SQLTYPE_NTEXT: 			$str_type = 'ntext'; break;
-			case SQLSRV_SQLTYPE_REAL: 			$str_type = 'real'; break;
-			case SQLSRV_SQLTYPE_SMALLDATETIME: 	$str_type = 'smalldatetime'; break;
-			case SQLSRV_SQLTYPE_SMALLINT: 		$str_type = 'smallint'; break;
-			case SQLSRV_SQLTYPE_SMALLMONEY: 	$str_type = 'smallmoney'; break;
-			case SQLSRV_SQLTYPE_TEXT: 			$str_type = 'text'; break;
-			case SQLSRV_SQLTYPE_TIMESTAMP: 		$str_type = 'timestamp'; break;
-			case SQLSRV_SQLTYPE_TINYINT: 		$str_type = 'tinyint'; break;
-			case SQLSRV_SQLTYPE_UNIQUEIDENTIFIER: $str_type = 'uniqueidentifier'; break;
-			case SQLSRV_SQLTYPE_UDT: 			$str_type = 'UDT'; break;
-			case SQLSRV_SQLTYPE_VARBINARY/*($byteCount)*/: $str_type = 'varbinary'; break;
-			case SQLSRV_SQLTYPE_VARCHAR/*($charCount)*/: $str_type = 'varchar'; break;
-			case SQLSRV_SQLTYPE_XML: 			$str_type = 'xml'; break;
-			default: $str_type = $int_type;
-		}
-		return $str_type;
-	}
-
-	public function free()
-	{
-		unset($this->m_rows);
-		return;
-	}
-}
-
-/**
-* @package dbal
-*/
-class phpbb_db_driver_mssqlnative extends phpbb_db_driver_mssql_base
-{
-	var $m_insert_id = NULL;
-	var $last_query_text = '';
-	var $query_options = array();
-	var $connect_error = '';
-
-	/**
-	* Connect to server
-	*/
-	function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false)
-	{
-		// Test for driver support, to avoid suppressed fatal error
-		if (!function_exists('sqlsrv_connect'))
-		{
-			$this->connect_error = 'Native MS SQL Server driver for PHP is missing or needs to be updated. Version 1.1 or later is required to install phpBB3. You can download the driver from: http://www.microsoft.com/sqlserver/2005/en/us/PHP-Driver.aspx';
-			return $this->sql_error('');
-		}
-
-		//set up connection variables
-		$this->persistency = $persistency;
-		$this->user = $sqluser;
-		$this->dbname = $database;
-		$port_delimiter = (defined('PHP_OS') && substr(PHP_OS, 0, 3) === 'WIN') ? ',' : ':';
-		$this->server = $sqlserver . (($port) ? $port_delimiter . $port : '');
-
-		//connect to database
-		$this->db_connect_id = sqlsrv_connect($this->server, array(
-			'Database' => $this->dbname,
-			'UID' => $this->user,
-			'PWD' => $sqlpassword
-		));
-
-		return ($this->db_connect_id) ? $this->db_connect_id : $this->sql_error('');
-	}
-
-	/**
-	* Version information about used database
-	* @param bool $raw if true, only return the fetched sql_server_version
-	* @param bool $use_cache If true, it is safe to retrieve the value from the cache
-	* @return string sql server version
-	*/
-	function sql_server_info($raw = false, $use_cache = true)
-	{
-		global $cache;
-
-		if (!$use_cache || empty($cache) || ($this->sql_server_version = $cache->get('mssql_version')) === false)
-		{
-			$arr_server_info = sqlsrv_server_info($this->db_connect_id);
-			$this->sql_server_version = $arr_server_info['SQLServerVersion'];
-
-			if (!empty($cache) && $use_cache)
-			{
-				$cache->put('mssql_version', $this->sql_server_version);
-			}
-		}
-
-		if ($raw)
-		{
-			return $this->sql_server_version;
-		}
-
-		return ($this->sql_server_version) ? 'MSSQL<br />' . $this->sql_server_version : 'MSSQL';
-	}
-
-	/**
-	* {@inheritDoc}
-	*/
-	function sql_buffer_nested_transactions()
-	{
-		return true;
-	}
-
-	/**
-	* SQL Transaction
-	* @access private
-	*/
-	function _sql_transaction($status = 'begin')
-	{
-		switch ($status)
-		{
-			case 'begin':
-				return sqlsrv_begin_transaction($this->db_connect_id);
-			break;
-
-			case 'commit':
-				return sqlsrv_commit($this->db_connect_id);
-			break;
-
-			case 'rollback':
-				return sqlsrv_rollback($this->db_connect_id);
-			break;
-		}
-		return true;
-	}
-
-	/**
-	* Base query method
-	*
-	* @param	string	$query		Contains the SQL query which shall be executed
-	* @param	int		$cache_ttl	Either 0 to avoid caching or the time in seconds which the result shall be kept in cache
-	* @return	mixed				When casted to bool the returned value returns true on success and false on failure
-	*
-	* @access	public
-	*/
-	function sql_query($query = '', $cache_ttl = 0)
-	{
-		if ($query != '')
-		{
-			global $cache;
-
-			// EXPLAIN only in extra debug mode
-			if (defined('DEBUG'))
-			{
-				$this->sql_report('start', $query);
-			}
-
-			$this->last_query_text = $query;
-			$this->query_result = ($cache && $cache_ttl) ? $cache->sql_load($query) : false;
-			$this->sql_add_num_queries($this->query_result);
-
-			if ($this->query_result === false)
-			{
-				if (($this->query_result = @sqlsrv_query($this->db_connect_id, $query, array(), $this->query_options)) === false)
-				{
-					$this->sql_error($query);
-				}
-				// reset options for next query
-				$this->query_options = array();
-
-				if (defined('DEBUG'))
-				{
-					$this->sql_report('stop', $query);
-				}
-
-				if ($cache_ttl)
-				{
-					$this->open_queries[(int) $this->query_result] = $this->query_result;
-					$this->query_result = $cache->sql_save($this, $query, $this->query_result, $cache_ttl);
-				}
-				else if (strpos($query, 'SELECT') === 0 && $this->query_result)
-				{
-					$this->open_queries[(int) $this->query_result] = $this->query_result;
-				}
-			}
-			else if (defined('DEBUG'))
-			{
-				$this->sql_report('fromcache', $query);
-			}
-		}
-		else
-		{
-			return false;
-		}
-		return $this->query_result;
-	}
-
-	/**
-	* Build LIMIT query
-	*/
-	function _sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)
-	{
-		$this->query_result = false;
-
-		// total == 0 means all results - not zero results
-		if ($offset == 0 && $total !== 0)
-		{
-			if (strpos($query, "SELECT") === false)
-			{
-				$query = "TOP {$total} " . $query;
-			}
-			else
-			{
-				$query = preg_replace('/SELECT(\s*DISTINCT)?/Dsi', 'SELECT$1 TOP '.$total, $query);
-			}
-		}
-		else if ($offset > 0)
-		{
-			$query = preg_replace('/SELECT(\s*DISTINCT)?/Dsi', 'SELECT$1 TOP(10000000) ', $query);
-			$query = 'SELECT *
-					FROM (SELECT sub2.*, ROW_NUMBER() OVER(ORDER BY sub2.line2) AS line3
-					FROM (SELECT 1 AS line2, sub1.* FROM (' . $query . ') AS sub1) as sub2) AS sub3';
-
-			if ($total > 0)
-			{
-				$query .= ' WHERE line3 BETWEEN ' . ($offset+1) . ' AND ' . ($offset + $total);
-			}
-			else
-			{
-				$query .= ' WHERE line3 > ' . $offset;
-			}
-		}
-
-		$result = $this->sql_query($query, $cache_ttl);
-
-		return $result;
-	}
-
-	/**
-	* Return number of affected rows
-	*/
-	function sql_affectedrows()
-	{
-		return (!empty($this->query_result)) ? @sqlsrv_rows_affected($this->query_result) : false;
-	}
-
-	/**
-	* Fetch current row
-	*/
-	function sql_fetchrow($query_id = false)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache->sql_exists($query_id))
-		{
-			return $cache->sql_fetchrow($query_id);
-		}
-
-		if ($query_id === false)
-		{
-			return false;
-		}
-
-		$row = @sqlsrv_fetch_array($query_id, SQLSRV_FETCH_ASSOC);
-
-		if ($row)
-		{
-			foreach ($row as $key => $value)
-			{
-				$row[$key] = ($value === ' ' || $value === NULL) ? '' : $value;
-			}
-
-			// remove helper values from LIMIT queries
-			if (isset($row['line2']))
-			{
-				unset($row['line2'], $row['line3']);
-			}
-		}
-		return (sizeof($row)) ? $row : false;
-	}
-
-	/**
-	* Get last inserted id after insert statement
-	*/
-	function sql_nextid()
-	{
-		$result_id = @sqlsrv_query($this->db_connect_id, 'SELECT @@IDENTITY');
-
-		if ($result_id !== false)
-		{
-			$row = @sqlsrv_fetch_array($result_id);
-			$id = $row[0];
-			@sqlsrv_free_stmt($result_id);
-			return $id;
-		}
-		else
-		{
-			return false;
-		}
-	}
-
-	/**
-	* Free sql result
-	*/
-	function sql_freeresult($query_id = false)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache->sql_exists($query_id))
-		{
-			return $cache->sql_freeresult($query_id);
-		}
-
-		if (isset($this->open_queries[$query_id]))
-		{
-			unset($this->open_queries[$query_id]);
-			return @sqlsrv_free_stmt($query_id);
-		}
-		return false;
-	}
-
-	/**
-	* return sql error array
-	* @access private
-	*/
-	function _sql_error()
-	{
-		if (function_exists('sqlsrv_errors'))
-		{
-			$errors = @sqlsrv_errors(SQLSRV_ERR_ERRORS);
-			$error_message = '';
-			$code = 0;
-
-			if ($errors != null)
-			{
-				foreach ($errors as $error)
-				{
-					$error_message .= "SQLSTATE: " . $error[ 'SQLSTATE'] . "\n";
-					$error_message .= "code: " . $error[ 'code'] . "\n";
-					$code = $error['code'];
-					$error_message .= "message: " . $error[ 'message'] . "\n";
-				}
-				$this->last_error_result = $error_message;
-				$error = $this->last_error_result;
-			}
-			else
-			{
-				$error = (isset($this->last_error_result) && $this->last_error_result) ? $this->last_error_result : array();
-			}
-
-			$error = array(
-				'message'	=> $error,
-				'code'		=> $code,
-			);
-		}
-		else
-		{
-			$error = array(
-				'message'	=> $this->connect_error,
-				'code'		=> '',
-			);
-		}
-
-		return $error;
-	}
-
-	/**
-	* Close sql connection
-	* @access private
-	*/
-	function _sql_close()
-	{
-		return @sqlsrv_close($this->db_connect_id);
-	}
-
-	/**
-	* Build db-specific report
-	* @access private
-	*/
-	function _sql_report($mode, $query = '')
-	{
-		switch ($mode)
-		{
-			case 'start':
-				$html_table = false;
-				@sqlsrv_query($this->db_connect_id, 'SET SHOWPLAN_TEXT ON;');
-				if ($result = @sqlsrv_query($this->db_connect_id, $query))
-				{
-					@sqlsrv_next_result($result);
-					while ($row = @sqlsrv_fetch_array($result))
-					{
-						$html_table = $this->sql_report('add_select_row', $query, $html_table, $row);
-					}
-				}
-				@sqlsrv_query($this->db_connect_id, 'SET SHOWPLAN_TEXT OFF;');
-				@sqlsrv_free_stmt($result);
-
-				if ($html_table)
-				{
-					$this->html_hold .= '</table>';
-				}
-			break;
-
-			case 'fromcache':
-				$endtime = explode(' ', microtime());
-				$endtime = $endtime[0] + $endtime[1];
-
-				$result = @sqlsrv_query($this->db_connect_id, $query);
-				while ($void = @sqlsrv_fetch_array($result))
-				{
-					// Take the time spent on parsing rows into account
-				}
-				@sqlsrv_free_stmt($result);
-
-				$splittime = explode(' ', microtime());
-				$splittime = $splittime[0] + $splittime[1];
-
-				$this->sql_report('record_fromcache', $query, $endtime, $splittime);
-
-			break;
-		}
-	}
-
-	/**
-	* Utility method used to retrieve number of rows
-	* Emulates mysql_num_rows
-	* Used in acp_database.php -> write_data_mssqlnative()
-	* Requires a static or keyset cursor to be definde via
-	* mssqlnative_set_query_options()
-	*/
-	function mssqlnative_num_rows($res)
-	{
-		if ($res !== false)
-		{
-			return sqlsrv_num_rows($res);
-		}
-		else
-		{
-			return false;
-		}
-	}
-
-	/**
-	* Allows setting mssqlnative specific query options passed to sqlsrv_query as 4th parameter.
-	*/
-	function mssqlnative_set_query_options($options)
-	{
-		$this->query_options = $options;
-	}
-}
diff --git a/phpBB/includes/db/driver/mysql.php b/phpBB/includes/db/driver/mysql.php
deleted file mode 100644
index f3744ac09d..0000000000
--- a/phpBB/includes/db/driver/mysql.php
+++ /dev/null
@@ -1,472 +0,0 @@
-<?php
-/**
-*
-* @package dbal
-* @copyright (c) 2005 phpBB Group
-* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
-*
-*/
-
-/**
-* @ignore
-*/
-if (!defined('IN_PHPBB'))
-{
-	exit;
-}
-
-/**
-* MySQL4 Database Abstraction Layer
-* Compatible with:
-* MySQL 3.23+
-* MySQL 4.0+
-* MySQL 4.1+
-* MySQL 5.0+
-* @package dbal
-*/
-class phpbb_db_driver_mysql extends phpbb_db_driver_mysql_base
-{
-	var $multi_insert = true;
-	var $connect_error = '';
-
-	/**
-	* Connect to server
-	* @access public
-	*/
-	function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false)
-	{
-		$this->persistency = $persistency;
-		$this->user = $sqluser;
-		$this->server = $sqlserver . (($port) ? ':' . $port : '');
-		$this->dbname = $database;
-
-		$this->sql_layer = 'mysql4';
-
-		if ($this->persistency)
-		{
-			if (!function_exists('mysql_pconnect'))
-			{
-				$this->connect_error = 'mysql_pconnect function does not exist, is mysql extension installed?';
-				return $this->sql_error('');
-			}
-			$this->db_connect_id = @mysql_pconnect($this->server, $this->user, $sqlpassword);
-		}
-		else
-		{
-			if (!function_exists('mysql_connect'))
-			{
-				$this->connect_error = 'mysql_connect function does not exist, is mysql extension installed?';
-				return $this->sql_error('');
-			}
-			$this->db_connect_id = @mysql_connect($this->server, $this->user, $sqlpassword, $new_link);
-		}
-
-		if ($this->db_connect_id && $this->dbname != '')
-		{
-			if (@mysql_select_db($this->dbname, $this->db_connect_id))
-			{
-				// Determine what version we are using and if it natively supports UNICODE
-				if (version_compare($this->sql_server_info(true), '4.1.0', '>='))
-				{
-					@mysql_query("SET NAMES 'utf8'", $this->db_connect_id);
-
-					// enforce strict mode on databases that support it
-					if (version_compare($this->sql_server_info(true), '5.0.2', '>='))
-					{
-						$result = @mysql_query('SELECT @@session.sql_mode AS sql_mode', $this->db_connect_id);
-						$row = @mysql_fetch_assoc($result);
-						@mysql_free_result($result);
-						$modes = array_map('trim', explode(',', $row['sql_mode']));
-
-						// TRADITIONAL includes STRICT_ALL_TABLES and STRICT_TRANS_TABLES
-						if (!in_array('TRADITIONAL', $modes))
-						{
-							if (!in_array('STRICT_ALL_TABLES', $modes))
-							{
-								$modes[] = 'STRICT_ALL_TABLES';
-							}
-
-							if (!in_array('STRICT_TRANS_TABLES', $modes))
-							{
-								$modes[] = 'STRICT_TRANS_TABLES';
-							}
-						}
-
-						$mode = implode(',', $modes);
-						@mysql_query("SET SESSION sql_mode='{$mode}'", $this->db_connect_id);
-					}
-				}
-				else if (version_compare($this->sql_server_info(true), '4.0.0', '<'))
-				{
-					$this->sql_layer = 'mysql';
-				}
-
-				return $this->db_connect_id;
-			}
-		}
-
-		return $this->sql_error('');
-	}
-
-	/**
-	* Version information about used database
-	* @param bool $raw if true, only return the fetched sql_server_version
-	* @param bool $use_cache If true, it is safe to retrieve the value from the cache
-	* @return string sql server version
-	*/
-	function sql_server_info($raw = false, $use_cache = true)
-	{
-		global $cache;
-
-		if (!$use_cache || empty($cache) || ($this->sql_server_version = $cache->get('mysql_version')) === false)
-		{
-			$result = @mysql_query('SELECT VERSION() AS version', $this->db_connect_id);
-			$row = @mysql_fetch_assoc($result);
-			@mysql_free_result($result);
-
-			$this->sql_server_version = $row['version'];
-
-			if (!empty($cache) && $use_cache)
-			{
-				$cache->put('mysql_version', $this->sql_server_version);
-			}
-		}
-
-		return ($raw) ? $this->sql_server_version : 'MySQL ' . $this->sql_server_version;
-	}
-
-	/**
-	* SQL Transaction
-	* @access private
-	*/
-	function _sql_transaction($status = 'begin')
-	{
-		switch ($status)
-		{
-			case 'begin':
-				return @mysql_query('BEGIN', $this->db_connect_id);
-			break;
-
-			case 'commit':
-				return @mysql_query('COMMIT', $this->db_connect_id);
-			break;
-
-			case 'rollback':
-				return @mysql_query('ROLLBACK', $this->db_connect_id);
-			break;
-		}
-
-		return true;
-	}
-
-	/**
-	* Base query method
-	*
-	* @param	string	$query		Contains the SQL query which shall be executed
-	* @param	int		$cache_ttl	Either 0 to avoid caching or the time in seconds which the result shall be kept in cache
-	* @return	mixed				When casted to bool the returned value returns true on success and false on failure
-	*
-	* @access	public
-	*/
-	function sql_query($query = '', $cache_ttl = 0)
-	{
-		if ($query != '')
-		{
-			global $cache;
-
-			// EXPLAIN only in extra debug mode
-			if (defined('DEBUG'))
-			{
-				$this->sql_report('start', $query);
-			}
-
-			$this->query_result = ($cache && $cache_ttl) ? $cache->sql_load($query) : false;
-			$this->sql_add_num_queries($this->query_result);
-
-			if ($this->query_result === false)
-			{
-				if (($this->query_result = @mysql_query($query, $this->db_connect_id)) === false)
-				{
-					$this->sql_error($query);
-				}
-
-				if (defined('DEBUG'))
-				{
-					$this->sql_report('stop', $query);
-				}
-
-				if ($cache && $cache_ttl)
-				{
-					$this->open_queries[(int) $this->query_result] = $this->query_result;
-					$this->query_result = $cache->sql_save($this, $query, $this->query_result, $cache_ttl);
-				}
-				else if (strpos($query, 'SELECT') === 0 && $this->query_result)
-				{
-					$this->open_queries[(int) $this->query_result] = $this->query_result;
-				}
-			}
-			else if (defined('DEBUG'))
-			{
-				$this->sql_report('fromcache', $query);
-			}
-		}
-		else
-		{
-			return false;
-		}
-
-		return $this->query_result;
-	}
-
-	/**
-	* Return number of affected rows
-	*/
-	function sql_affectedrows()
-	{
-		return ($this->db_connect_id) ? @mysql_affected_rows($this->db_connect_id) : false;
-	}
-
-	/**
-	* Fetch current row
-	*/
-	function sql_fetchrow($query_id = false)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache && $cache->sql_exists($query_id))
-		{
-			return $cache->sql_fetchrow($query_id);
-		}
-
-		return ($query_id !== false) ? @mysql_fetch_assoc($query_id) : false;
-	}
-
-	/**
-	* Seek to given row number
-	* rownum is zero-based
-	*/
-	function sql_rowseek($rownum, &$query_id)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache && $cache->sql_exists($query_id))
-		{
-			return $cache->sql_rowseek($rownum, $query_id);
-		}
-
-		return ($query_id !== false) ? @mysql_data_seek($query_id, $rownum) : false;
-	}
-
-	/**
-	* Get last inserted id after insert statement
-	*/
-	function sql_nextid()
-	{
-		return ($this->db_connect_id) ? @mysql_insert_id($this->db_connect_id) : false;
-	}
-
-	/**
-	* Free sql result
-	*/
-	function sql_freeresult($query_id = false)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache && $cache->sql_exists($query_id))
-		{
-			return $cache->sql_freeresult($query_id);
-		}
-
-		if (isset($this->open_queries[(int) $query_id]))
-		{
-			unset($this->open_queries[(int) $query_id]);
-			return @mysql_free_result($query_id);
-		}
-
-		return false;
-	}
-
-	/**
-	* Escape string used in sql query
-	*/
-	function sql_escape($msg)
-	{
-		if (!$this->db_connect_id)
-		{
-			return @mysql_real_escape_string($msg);
-		}
-
-		return @mysql_real_escape_string($msg, $this->db_connect_id);
-	}
-
-	/**
-	* return sql error array
-	* @access private
-	*/
-	function _sql_error()
-	{
-		if ($this->db_connect_id)
-		{
-			$error = array(
-				'message'	=> @mysql_error($this->db_connect_id),
-				'code'		=> @mysql_errno($this->db_connect_id),
-			);
-		}
-		else if (function_exists('mysql_error'))
-		{
-			$error = array(
-				'message'	=> @mysql_error(),
-				'code'		=> @mysql_errno(),
-			);
-		}
-		else
-		{
-			$error = array(
-				'message'	=> $this->connect_error,
-				'code'		=> '',
-			);
-		}
-
-		return $error;
-	}
-
-	/**
-	* Close sql connection
-	* @access private
-	*/
-	function _sql_close()
-	{
-		return @mysql_close($this->db_connect_id);
-	}
-
-	/**
-	* Build db-specific report
-	* @access private
-	*/
-	function _sql_report($mode, $query = '')
-	{
-		static $test_prof;
-
-		// current detection method, might just switch to see the existance of INFORMATION_SCHEMA.PROFILING
-		if ($test_prof === null)
-		{
-			$test_prof = false;
-			if (version_compare($this->sql_server_info(true), '5.0.37', '>=') && version_compare($this->sql_server_info(true), '5.1', '<'))
-			{
-				$test_prof = true;
-			}
-		}
-
-		switch ($mode)
-		{
-			case 'start':
-
-				$explain_query = $query;
-				if (preg_match('/UPDATE ([a-z0-9_]+).*?WHERE(.*)/s', $query, $m))
-				{
-					$explain_query = 'SELECT * FROM ' . $m[1] . ' WHERE ' . $m[2];
-				}
-				else if (preg_match('/DELETE FROM ([a-z0-9_]+).*?WHERE(.*)/s', $query, $m))
-				{
-					$explain_query = 'SELECT * FROM ' . $m[1] . ' WHERE ' . $m[2];
-				}
-
-				if (preg_match('/^SELECT/', $explain_query))
-				{
-					$html_table = false;
-
-					// begin profiling
-					if ($test_prof)
-					{
-						@mysql_query('SET profiling = 1;', $this->db_connect_id);
-					}
-
-					if ($result = @mysql_query("EXPLAIN $explain_query", $this->db_connect_id))
-					{
-						while ($row = @mysql_fetch_assoc($result))
-						{
-							$html_table = $this->sql_report('add_select_row', $query, $html_table, $row);
-						}
-					}
-					@mysql_free_result($result);
-
-					if ($html_table)
-					{
-						$this->html_hold .= '</table>';
-					}
-
-					if ($test_prof)
-					{
-						$html_table = false;
-
-						// get the last profile
-						if ($result = @mysql_query('SHOW PROFILE ALL;', $this->db_connect_id))
-						{
-							$this->html_hold .= '<br />';
-							while ($row = @mysql_fetch_assoc($result))
-							{
-								// make <unknown> HTML safe
-								if (!empty($row['Source_function']))
-								{
-									$row['Source_function'] = str_replace(array('<', '>'), array('&lt;', '&gt;'), $row['Source_function']);
-								}
-
-								// remove unsupported features
-								foreach ($row as $key => $val)
-								{
-									if ($val === null)
-									{
-										unset($row[$key]);
-									}
-								}
-								$html_table = $this->sql_report('add_select_row', $query, $html_table, $row);
-							}
-						}
-						@mysql_free_result($result);
-
-						if ($html_table)
-						{
-							$this->html_hold .= '</table>';
-						}
-
-						@mysql_query('SET profiling = 0;', $this->db_connect_id);
-					}
-				}
-
-			break;
-
-			case 'fromcache':
-				$endtime = explode(' ', microtime());
-				$endtime = $endtime[0] + $endtime[1];
-
-				$result = @mysql_query($query, $this->db_connect_id);
-				while ($void = @mysql_fetch_assoc($result))
-				{
-					// Take the time spent on parsing rows into account
-				}
-				@mysql_free_result($result);
-
-				$splittime = explode(' ', microtime());
-				$splittime = $splittime[0] + $splittime[1];
-
-				$this->sql_report('record_fromcache', $query, $endtime, $splittime);
-
-			break;
-		}
-	}
-}
diff --git a/phpBB/includes/db/driver/mysql_base.php b/phpBB/includes/db/driver/mysql_base.php
deleted file mode 100644
index ba44ea61aa..0000000000
--- a/phpBB/includes/db/driver/mysql_base.php
+++ /dev/null
@@ -1,145 +0,0 @@
-<?php
-/**
-*
-* @package dbal
-* @copyright (c) 2013 phpBB Group
-* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
-*
-*/
-
-/**
-* @ignore
-*/
-if (!defined('IN_PHPBB'))
-{
-	exit;
-}
-
-/**
-* Abstract MySQL Database Base Abstraction Layer
-* @package dbal
-*/
-abstract class phpbb_db_driver_mysql_base extends phpbb_db_driver
-{
-	/**
-	* {@inheritDoc}
-	*/
-	public function sql_concatenate($expr1, $expr2)
-	{
-		return 'CONCAT(' . $expr1 . ', ' . $expr2 . ')';
-	}
-
-	/**
-	* Build LIMIT query
-	*/
-	function _sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)
-	{
-		$this->query_result = false;
-
-		// if $total is set to 0 we do not want to limit the number of rows
-		if ($total == 0)
-		{
-			// MySQL 4.1+ no longer supports -1 in limit queries
-			$total = '18446744073709551615';
-		}
-
-		$query .= "\n LIMIT " . ((!empty($offset)) ? $offset . ', ' . $total : $total);
-
-		return $this->sql_query($query, $cache_ttl);
-	}
-
-	/**
-	* Gets the estimated number of rows in a specified table.
-	*
-	* @param string $table_name		Table name
-	*
-	* @return string				Number of rows in $table_name.
-	*								Prefixed with ~ if estimated (otherwise exact).
-	*
-	* @access public
-	*/
-	function get_estimated_row_count($table_name)
-	{
-		$table_status = $this->get_table_status($table_name);
-
-		if (isset($table_status['Engine']))
-		{
-			if ($table_status['Engine'] === 'MyISAM')
-			{
-				return $table_status['Rows'];
-			}
-			else if ($table_status['Engine'] === 'InnoDB' && $table_status['Rows'] > 100000)
-			{
-				return '~' . $table_status['Rows'];
-			}
-		}
-
-		return parent::get_row_count($table_name);
-	}
-
-	/**
-	* Gets the exact number of rows in a specified table.
-	*
-	* @param string $table_name		Table name
-	*
-	* @return string				Exact number of rows in $table_name.
-	*
-	* @access public
-	*/
-	function get_row_count($table_name)
-	{
-		$table_status = $this->get_table_status($table_name);
-
-		if (isset($table_status['Engine']) && $table_status['Engine'] === 'MyISAM')
-		{
-			return $table_status['Rows'];
-		}
-
-		return parent::get_row_count($table_name);
-	}
-
-	/**
-	* Gets some information about the specified table.
-	*
-	* @param string $table_name		Table name
-	*
-	* @return array
-	*
-	* @access protected
-	*/
-	function get_table_status($table_name)
-	{
-		$sql = "SHOW TABLE STATUS
-			LIKE '" . $this->sql_escape($table_name) . "'";
-		$result = $this->sql_query($sql);
-		$table_status = $this->sql_fetchrow($result);
-		$this->sql_freeresult($result);
-
-		return $table_status;
-	}
-
-	/**
-	* Build LIKE expression
-	* @access private
-	*/
-	function _sql_like_expression($expression)
-	{
-		return $expression;
-	}
-
-	/**
-	* Build db-specific query data
-	* @access private
-	*/
-	function _sql_custom_build($stage, $data)
-	{
-		switch ($stage)
-		{
-			case 'FROM':
-				$data = '(' . $data . ')';
-			break;
-		}
-
-		return $data;
-	}
-}
diff --git a/phpBB/includes/db/driver/mysqli.php b/phpBB/includes/db/driver/mysqli.php
deleted file mode 100644
index 0f7a73ee6e..0000000000
--- a/phpBB/includes/db/driver/mysqli.php
+++ /dev/null
@@ -1,463 +0,0 @@
-<?php
-/**
-*
-* @package dbal
-* @copyright (c) 2005 phpBB Group
-* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
-*
-*/
-
-/**
-* @ignore
-*/
-if (!defined('IN_PHPBB'))
-{
-	exit;
-}
-
-/**
-* MySQLi Database Abstraction Layer
-* mysqli-extension has to be compiled with:
-* MySQL 4.1+ or MySQL 5.0+
-* @package dbal
-*/
-class phpbb_db_driver_mysqli extends phpbb_db_driver_mysql_base
-{
-	var $multi_insert = true;
-	var $connect_error = '';
-
-	/**
-	* Connect to server
-	*/
-	function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false , $new_link = false)
-	{
-		if (!function_exists('mysqli_connect'))
-		{
-			$this->connect_error = 'mysqli_connect function does not exist, is mysqli extension installed?';
-			return $this->sql_error('');
-		}
-
-		// Mysqli extension supports persistent connection since PHP 5.3.0
-		$this->persistency = (version_compare(PHP_VERSION, '5.3.0', '>=')) ? $persistency : false;
-		$this->user = $sqluser;
-
-		// If persistent connection, set dbhost to localhost when empty and prepend it with 'p:' prefix
-		$this->server = ($this->persistency) ? 'p:' . (($sqlserver) ? $sqlserver : 'localhost') : $sqlserver;
-
-		$this->dbname = $database;
-		$port = (!$port) ? NULL : $port;
-
-		// If port is set and it is not numeric, most likely mysqli socket is set.
-		// Try to map it to the $socket parameter.
-		$socket = NULL;
-		if ($port)
-		{
-			if (is_numeric($port))
-			{
-				$port = (int) $port;
-			}
-			else
-			{
-				$socket = $port;
-				$port = NULL;
-			}
-		}
-
-		$this->db_connect_id = @mysqli_connect($this->server, $this->user, $sqlpassword, $this->dbname, $port, $socket);
-
-		if ($this->db_connect_id && $this->dbname != '')
-		{
-			@mysqli_query($this->db_connect_id, "SET NAMES 'utf8'");
-
-			// enforce strict mode on databases that support it
-			if (version_compare($this->sql_server_info(true), '5.0.2', '>='))
-			{
-				$result = @mysqli_query($this->db_connect_id, 'SELECT @@session.sql_mode AS sql_mode');
-				$row = @mysqli_fetch_assoc($result);
-				@mysqli_free_result($result);
-
-				$modes = array_map('trim', explode(',', $row['sql_mode']));
-
-				// TRADITIONAL includes STRICT_ALL_TABLES and STRICT_TRANS_TABLES
-				if (!in_array('TRADITIONAL', $modes))
-				{
-					if (!in_array('STRICT_ALL_TABLES', $modes))
-					{
-						$modes[] = 'STRICT_ALL_TABLES';
-					}
-
-					if (!in_array('STRICT_TRANS_TABLES', $modes))
-					{
-						$modes[] = 'STRICT_TRANS_TABLES';
-					}
-				}
-
-				$mode = implode(',', $modes);
-				@mysqli_query($this->db_connect_id, "SET SESSION sql_mode='{$mode}'");
-			}
-			return $this->db_connect_id;
-		}
-
-		return $this->sql_error('');
-	}
-
-	/**
-	* Version information about used database
-	* @param bool $raw if true, only return the fetched sql_server_version
-	* @param bool $use_cache If true, it is safe to retrieve the value from the cache
-	* @return string sql server version
-	*/
-	function sql_server_info($raw = false, $use_cache = true)
-	{
-		global $cache;
-
-		if (!$use_cache || empty($cache) || ($this->sql_server_version = $cache->get('mysqli_version')) === false)
-		{
-			$result = @mysqli_query($this->db_connect_id, 'SELECT VERSION() AS version');
-			$row = @mysqli_fetch_assoc($result);
-			@mysqli_free_result($result);
-
-			$this->sql_server_version = $row['version'];
-
-			if (!empty($cache) && $use_cache)
-			{
-				$cache->put('mysqli_version', $this->sql_server_version);
-			}
-		}
-
-		return ($raw) ? $this->sql_server_version : 'MySQL(i) ' . $this->sql_server_version;
-	}
-
-	/**
-	* SQL Transaction
-	* @access private
-	*/
-	function _sql_transaction($status = 'begin')
-	{
-		switch ($status)
-		{
-			case 'begin':
-				return @mysqli_autocommit($this->db_connect_id, false);
-			break;
-
-			case 'commit':
-				$result = @mysqli_commit($this->db_connect_id);
-				@mysqli_autocommit($this->db_connect_id, true);
-				return $result;
-			break;
-
-			case 'rollback':
-				$result = @mysqli_rollback($this->db_connect_id);
-				@mysqli_autocommit($this->db_connect_id, true);
-				return $result;
-			break;
-		}
-
-		return true;
-	}
-
-	/**
-	* Base query method
-	*
-	* @param	string	$query		Contains the SQL query which shall be executed
-	* @param	int		$cache_ttl	Either 0 to avoid caching or the time in seconds which the result shall be kept in cache
-	* @return	mixed				When casted to bool the returned value returns true on success and false on failure
-	*
-	* @access	public
-	*/
-	function sql_query($query = '', $cache_ttl = 0)
-	{
-		if ($query != '')
-		{
-			global $cache;
-
-			// EXPLAIN only in extra debug mode
-			if (defined('DEBUG'))
-			{
-				$this->sql_report('start', $query);
-			}
-
-			$this->query_result = ($cache && $cache_ttl) ? $cache->sql_load($query) : false;
-			$this->sql_add_num_queries($this->query_result);
-
-			if ($this->query_result === false)
-			{
-				if (($this->query_result = @mysqli_query($this->db_connect_id, $query)) === false)
-				{
-					$this->sql_error($query);
-				}
-
-				if (defined('DEBUG'))
-				{
-					$this->sql_report('stop', $query);
-				}
-
-				if ($cache && $cache_ttl)
-				{
-					$this->query_result = $cache->sql_save($this, $query, $this->query_result, $cache_ttl);
-				}
-			}
-			else if (defined('DEBUG'))
-			{
-				$this->sql_report('fromcache', $query);
-			}
-		}
-		else
-		{
-			return false;
-		}
-
-		return $this->query_result;
-	}
-
-	/**
-	* Return number of affected rows
-	*/
-	function sql_affectedrows()
-	{
-		return ($this->db_connect_id) ? @mysqli_affected_rows($this->db_connect_id) : false;
-	}
-
-	/**
-	* Fetch current row
-	*/
-	function sql_fetchrow($query_id = false)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache && !is_object($query_id) && $cache->sql_exists($query_id))
-		{
-			return $cache->sql_fetchrow($query_id);
-		}
-
-		if ($query_id !== false)
-		{
-			$result = @mysqli_fetch_assoc($query_id);
-			return $result !== null ? $result : false;
-		}
-
-		return false;
-	}
-
-	/**
-	* Seek to given row number
-	* rownum is zero-based
-	*/
-	function sql_rowseek($rownum, &$query_id)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache && !is_object($query_id) && $cache->sql_exists($query_id))
-		{
-			return $cache->sql_rowseek($rownum, $query_id);
-		}
-
-		return ($query_id !== false) ? @mysqli_data_seek($query_id, $rownum) : false;
-	}
-
-	/**
-	* Get last inserted id after insert statement
-	*/
-	function sql_nextid()
-	{
-		return ($this->db_connect_id) ? @mysqli_insert_id($this->db_connect_id) : false;
-	}
-
-	/**
-	* Free sql result
-	*/
-	function sql_freeresult($query_id = false)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache && !is_object($query_id) && $cache->sql_exists($query_id))
-		{
-			return $cache->sql_freeresult($query_id);
-		}
-
-		return @mysqli_free_result($query_id);
-	}
-
-	/**
-	* Escape string used in sql query
-	*/
-	function sql_escape($msg)
-	{
-		return @mysqli_real_escape_string($this->db_connect_id, $msg);
-	}
-
-	/**
-	* return sql error array
-	* @access private
-	*/
-	function _sql_error()
-	{
-		if ($this->db_connect_id)
-		{
-			$error = array(
-				'message'	=> @mysqli_error($this->db_connect_id),
-				'code'		=> @mysqli_errno($this->db_connect_id)
-			);
-		}
-		else if (function_exists('mysqli_connect_error'))
-		{
-			$error = array(
-				'message'	=> @mysqli_connect_error(),
-				'code'		=> @mysqli_connect_errno(),
-			);
-		}
-		else
-		{
-			$error = array(
-				'message'	=> $this->connect_error,
-				'code'		=> '',
-			);
-		}
-
-		return $error;
-	}
-
-	/**
-	* Close sql connection
-	* @access private
-	*/
-	function _sql_close()
-	{
-		return @mysqli_close($this->db_connect_id);
-	}
-
-	/**
-	* Build db-specific report
-	* @access private
-	*/
-	function _sql_report($mode, $query = '')
-	{
-		static $test_prof;
-
-		// current detection method, might just switch to see the existance of INFORMATION_SCHEMA.PROFILING
-		if ($test_prof === null)
-		{
-			$test_prof = false;
-			if (strpos(mysqli_get_server_info($this->db_connect_id), 'community') !== false)
-			{
-				$ver = mysqli_get_server_version($this->db_connect_id);
-				if ($ver >= 50037 && $ver < 50100)
-				{
-					$test_prof = true;
-				}
-			}
-		}
-
-		switch ($mode)
-		{
-			case 'start':
-
-				$explain_query = $query;
-				if (preg_match('/UPDATE ([a-z0-9_]+).*?WHERE(.*)/s', $query, $m))
-				{
-					$explain_query = 'SELECT * FROM ' . $m[1] . ' WHERE ' . $m[2];
-				}
-				else if (preg_match('/DELETE FROM ([a-z0-9_]+).*?WHERE(.*)/s', $query, $m))
-				{
-					$explain_query = 'SELECT * FROM ' . $m[1] . ' WHERE ' . $m[2];
-				}
-
-				if (preg_match('/^SELECT/', $explain_query))
-				{
-					$html_table = false;
-
-					// begin profiling
-					if ($test_prof)
-					{
-						@mysqli_query($this->db_connect_id, 'SET profiling = 1;');
-					}
-
-					if ($result = @mysqli_query($this->db_connect_id, "EXPLAIN $explain_query"))
-					{
-						while ($row = @mysqli_fetch_assoc($result))
-						{
-							$html_table = $this->sql_report('add_select_row', $query, $html_table, $row);
-						}
-					}
-					@mysqli_free_result($result);
-
-					if ($html_table)
-					{
-						$this->html_hold .= '</table>';
-					}
-
-					if ($test_prof)
-					{
-						$html_table = false;
-
-						// get the last profile
-						if ($result = @mysqli_query($this->db_connect_id, 'SHOW PROFILE ALL;'))
-						{
-							$this->html_hold .= '<br />';
-							while ($row = @mysqli_fetch_assoc($result))
-							{
-								// make <unknown> HTML safe
-								if (!empty($row['Source_function']))
-								{
-									$row['Source_function'] = str_replace(array('<', '>'), array('&lt;', '&gt;'), $row['Source_function']);
-								}
-
-								// remove unsupported features
-								foreach ($row as $key => $val)
-								{
-									if ($val === null)
-									{
-										unset($row[$key]);
-									}
-								}
-								$html_table = $this->sql_report('add_select_row', $query, $html_table, $row);
-							}
-						}
-						@mysqli_free_result($result);
-
-						if ($html_table)
-						{
-							$this->html_hold .= '</table>';
-						}
-
-						@mysqli_query($this->db_connect_id, 'SET profiling = 0;');
-					}
-				}
-
-			break;
-
-			case 'fromcache':
-				$endtime = explode(' ', microtime());
-				$endtime = $endtime[0] + $endtime[1];
-
-				$result = @mysqli_query($this->db_connect_id, $query);
-				while ($void = @mysqli_fetch_assoc($result))
-				{
-					// Take the time spent on parsing rows into account
-				}
-				@mysqli_free_result($result);
-
-				$splittime = explode(' ', microtime());
-				$splittime = $splittime[0] + $splittime[1];
-
-				$this->sql_report('record_fromcache', $query, $endtime, $splittime);
-
-			break;
-		}
-	}
-}
diff --git a/phpBB/includes/db/driver/oracle.php b/phpBB/includes/db/driver/oracle.php
deleted file mode 100644
index e21e07055d..0000000000
--- a/phpBB/includes/db/driver/oracle.php
+++ /dev/null
@@ -1,803 +0,0 @@
-<?php
-/**
-*
-* @package dbal
-* @copyright (c) 2005 phpBB Group
-* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
-*
-*/
-
-/**
-* @ignore
-*/
-if (!defined('IN_PHPBB'))
-{
-	exit;
-}
-
-/**
-* Oracle Database Abstraction Layer
-* @package dbal
-*/
-class phpbb_db_driver_oracle extends phpbb_db_driver
-{
-	var $last_query_text = '';
-	var $connect_error = '';
-
-	/**
-	* Connect to server
-	*/
-	function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false)
-	{
-		$this->persistency = $persistency;
-		$this->user = $sqluser;
-		$this->server = $sqlserver . (($port) ? ':' . $port : '');
-		$this->dbname = $database;
-
-		$connect = $database;
-
-		// support for "easy connect naming"
-		if ($sqlserver !== '' && $sqlserver !== '/')
-		{
-			if (substr($sqlserver, -1, 1) == '/')
-			{
-				$sqlserver == substr($sqlserver, 0, -1);
-			}
-			$connect = $sqlserver . (($port) ? ':' . $port : '') . '/' . $database;
-		}
-
-		if ($new_link)
-		{
-			if (!function_exists('ocinlogon'))
-			{
-				$this->connect_error = 'ocinlogon function does not exist, is oci extension installed?';
-				return $this->sql_error('');
-			}
-			$this->db_connect_id = @ocinlogon($this->user, $sqlpassword, $connect, 'UTF8');
-		}
-		else if ($this->persistency)
-		{
-			if (!function_exists('ociplogon'))
-			{
-				$this->connect_error = 'ociplogon function does not exist, is oci extension installed?';
-				return $this->sql_error('');
-			}
-			$this->db_connect_id = @ociplogon($this->user, $sqlpassword, $connect, 'UTF8');
-		}
-		else
-		{
-			if (!function_exists('ocilogon'))
-			{
-				$this->connect_error = 'ocilogon function does not exist, is oci extension installed?';
-				return $this->sql_error('');
-			}
-			$this->db_connect_id = @ocilogon($this->user, $sqlpassword, $connect, 'UTF8');
-		}
-
-		return ($this->db_connect_id) ? $this->db_connect_id : $this->sql_error('');
-	}
-
-	/**
-	* Version information about used database
-	* @param bool $raw if true, only return the fetched sql_server_version
-	* @param bool $use_cache forced to false for Oracle
-	* @return string sql server version
-	*/
-	function sql_server_info($raw = false, $use_cache = true)
-	{
-		/**
-		* force $use_cache false.  I didn't research why the caching code below is commented out
-		* but I assume its because the Oracle extension provides a direct method to access it
-		* without a query.
-		*/
-
-		$use_cache = false;
-/*
-		global $cache;
-
-		if (empty($cache) || ($this->sql_server_version = $cache->get('oracle_version')) === false)
-		{
-			$result = @ociparse($this->db_connect_id, 'SELECT * FROM v$version WHERE banner LIKE \'Oracle%\'');
-			@ociexecute($result, OCI_DEFAULT);
-			@ocicommit($this->db_connect_id);
-
-			$row = array();
-			@ocifetchinto($result, $row, OCI_ASSOC + OCI_RETURN_NULLS);
-			@ocifreestatement($result);
-			$this->sql_server_version = trim($row['BANNER']);
-
-			$cache->put('oracle_version', $this->sql_server_version);
-		}
-*/
-		$this->sql_server_version = @ociserverversion($this->db_connect_id);
-
-		return $this->sql_server_version;
-	}
-
-	/**
-	* SQL Transaction
-	* @access private
-	*/
-	function _sql_transaction($status = 'begin')
-	{
-		switch ($status)
-		{
-			case 'begin':
-				return true;
-			break;
-
-			case 'commit':
-				return @ocicommit($this->db_connect_id);
-			break;
-
-			case 'rollback':
-				return @ocirollback($this->db_connect_id);
-			break;
-		}
-
-		return true;
-	}
-
-	/**
-	* Oracle specific code to handle the fact that it does not compare columns properly
-	* @access private
-	*/
-	function _rewrite_col_compare($args)
-	{
-		if (sizeof($args) == 4)
-		{
-			if ($args[2] == '=')
-			{
-				return '(' . $args[0] . ' OR (' . $args[1] . ' is NULL AND ' . $args[3] . ' is NULL))';
-			}
-			else if ($args[2] == '<>')
-			{
-				// really just a fancy way of saying foo <> bar or (foo is NULL XOR bar is NULL) but SQL has no XOR :P
-				return '(' . $args[0] . ' OR ((' . $args[1] . ' is NULL AND ' . $args[3] . ' is NOT NULL) OR (' . $args[1] . ' is NOT NULL AND ' . $args[3] . ' is NULL)))';
-			}
-		}
-		else
-		{
-			return $this->_rewrite_where($args[0]);
-		}
-	}
-
-	/**
-	* Oracle specific code to handle it's lack of sanity
-	* @access private
-	*/
-	function _rewrite_where($where_clause)
-	{
-		preg_match_all('/\s*(AND|OR)?\s*([\w_.()]++)\s*(?:(=|<[=>]?|>=?|LIKE)\s*((?>\'(?>[^\']++|\'\')*+\'|[\d-.()]+))|((NOT )?IN\s*\((?>\'(?>[^\']++|\'\')*+\',? ?|[\d-.]+,? ?)*+\)))/', $where_clause, $result, PREG_SET_ORDER);
-		$out = '';
-		foreach ($result as $val)
-		{
-			if (!isset($val[5]))
-			{
-				if ($val[4] !== "''")
-				{
-					$out .= $val[0];
-				}
-				else
-				{
-					$out .= ' ' . $val[1] . ' ' . $val[2];
-					if ($val[3] == '=')
-					{
-						$out .= ' is NULL';
-					}
-					else if ($val[3] == '<>')
-					{
-						$out .= ' is NOT NULL';
-					}
-				}
-			}
-			else
-			{
-				$in_clause = array();
-				$sub_exp = substr($val[5], strpos($val[5], '(') + 1, -1);
-				$extra = false;
-				preg_match_all('/\'(?>[^\']++|\'\')*+\'|[\d-.]++/', $sub_exp, $sub_vals, PREG_PATTERN_ORDER);
-				$i = 0;
-				foreach ($sub_vals[0] as $sub_val)
-				{
-					// two things:
-					// 1) This determines if an empty string was in the IN clausing, making us turn it into a NULL comparison
-					// 2) This fixes the 1000 list limit that Oracle has (ORA-01795)
-					if ($sub_val !== "''")
-					{
-						$in_clause[(int) $i++/1000][] = $sub_val;
-					}
-					else
-					{
-						$extra = true;
-					}
-				}
-				if (!$extra && $i < 1000)
-				{
-					$out .= $val[0];
-				}
-				else
-				{
-					$out .= ' ' . $val[1] . '(';
-					$in_array = array();
-
-					// constuct each IN() clause
-					foreach ($in_clause as $in_values)
-					{
-						$in_array[] = $val[2] . ' ' . (isset($val[6]) ? $val[6] : '') . 'IN(' . implode(', ', $in_values) . ')';
-					}
-
-					// Join the IN() clauses against a few ORs (IN is just a nicer OR anyway)
-					$out .= implode(' OR ', $in_array);
-
-					// handle the empty string case
-					if ($extra)
-					{
-						$out .= ' OR ' . $val[2] . ' is ' . (isset($val[6]) ? $val[6] : '') . 'NULL';
-					}
-					$out .= ')';
-
-					unset($in_array, $in_clause);
-				}
-			}
-		}
-
-		return $out;
-	}
-
-	/**
-	* Base query method
-	*
-	* @param	string	$query		Contains the SQL query which shall be executed
-	* @param	int		$cache_ttl	Either 0 to avoid caching or the time in seconds which the result shall be kept in cache
-	* @return	mixed				When casted to bool the returned value returns true on success and false on failure
-	*
-	* @access	public
-	*/
-	function sql_query($query = '', $cache_ttl = 0)
-	{
-		if ($query != '')
-		{
-			global $cache;
-
-			// EXPLAIN only in extra debug mode
-			if (defined('DEBUG'))
-			{
-				$this->sql_report('start', $query);
-			}
-
-			$this->last_query_text = $query;
-			$this->query_result = ($cache && $cache_ttl) ? $cache->sql_load($query) : false;
-			$this->sql_add_num_queries($this->query_result);
-
-			if ($this->query_result === false)
-			{
-				$in_transaction = false;
-				if (!$this->transaction)
-				{
-					$this->sql_transaction('begin');
-				}
-				else
-				{
-					$in_transaction = true;
-				}
-
-				$array = array();
-
-				// We overcome Oracle's 4000 char limit by binding vars
-				if (strlen($query) > 4000)
-				{
-					if (preg_match('/^(INSERT INTO[^(]++)\\(([^()]+)\\) VALUES[^(]++\\((.*?)\\)$/sU', $query, $regs))
-					{
-						if (strlen($regs[3]) > 4000)
-						{
-							$cols = explode(', ', $regs[2]);
-
-							preg_match_all('/\'(?:[^\']++|\'\')*+\'|[\d-.]+/', $regs[3], $vals, PREG_PATTERN_ORDER);
-
-/*						The code inside this comment block breaks clob handling, but does allow the
-						database restore script to work.  If you want to allow no posts longer than 4KB
-						and/or need the db restore script, uncomment this.
-
-
-							if (sizeof($cols) !== sizeof($vals))
-							{
-								// Try to replace some common data we know is from our restore script or from other sources
-								$regs[3] = str_replace("'||chr(47)||'", '/', $regs[3]);
-								$_vals = explode(', ', $regs[3]);
-
-								$vals = array();
-								$is_in_val = false;
-								$i = 0;
-								$string = '';
-
-								foreach ($_vals as $value)
-								{
-									if (strpos($value, "'") === false && !$is_in_val)
-									{
-										$vals[$i++] = $value;
-										continue;
-									}
-
-									if (substr($value, -1) === "'")
-									{
-										$vals[$i] = $string . (($is_in_val) ? ', ' : '') . $value;
-										$string = '';
-										$is_in_val = false;
-
-										if ($vals[$i][0] !== "'")
-										{
-											$vals[$i] = "''" . $vals[$i];
-										}
-										$i++;
-										continue;
-									}
-									else
-									{
-										$string .= (($is_in_val) ? ', ' : '') . $value;
-										$is_in_val = true;
-									}
-								}
-
-								if ($string)
-								{
-									// New value if cols != value
-									$vals[(sizeof($cols) !== sizeof($vals)) ? $i : $i - 1] .= $string;
-								}
-
-								$vals = array(0 => $vals);
-							}
-*/
-
-							$inserts = $vals[0];
-							unset($vals);
-
-							foreach ($inserts as $key => $value)
-							{
-								if (!empty($value) && $value[0] === "'" && strlen($value) > 4002) // check to see if this thing is greater than the max + 'x2
-								{
-									$inserts[$key] = ':' . strtoupper($cols[$key]);
-									$array[$inserts[$key]] = str_replace("''", "'", substr($value, 1, -1));
-								}
-							}
-
-							$query = $regs[1] . '(' . $regs[2] . ') VALUES (' . implode(', ', $inserts) . ')';
-						}
-					}
-					else if (preg_match_all('/^(UPDATE [\\w_]++\\s+SET )([\\w_]++\\s*=\\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]+)(?:,\\s*[\\w_]++\\s*=\\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]+))*+)\\s+(WHERE.*)$/s', $query, $data, PREG_SET_ORDER))
-					{
-						if (strlen($data[0][2]) > 4000)
-						{
-							$update = $data[0][1];
-							$where = $data[0][3];
-							preg_match_all('/([\\w_]++)\\s*=\\s*(\'(?:[^\']++|\'\')*+\'|[\d-.]++)/', $data[0][2], $temp, PREG_SET_ORDER);
-							unset($data);
-
-							$cols = array();
-							foreach ($temp as $value)
-							{
-								if (!empty($value[2]) && $value[2][0] === "'" && strlen($value[2]) > 4002) // check to see if this thing is greater than the max + 'x2
-								{
-									$cols[] = $value[1] . '=:' . strtoupper($value[1]);
-									$array[$value[1]] = str_replace("''", "'", substr($value[2], 1, -1));
-								}
-								else
-								{
-									$cols[] = $value[1] . '=' . $value[2];
-								}
-							}
-
-							$query = $update . implode(', ', $cols) . ' ' . $where;
-							unset($cols);
-						}
-					}
-				}
-
-				switch (substr($query, 0, 6))
-				{
-					case 'DELETE':
-						if (preg_match('/^(DELETE FROM [\w_]++ WHERE)((?:\s*(?:AND|OR)?\s*[\w_]+\s*(?:(?:=|<>)\s*(?>\'(?>[^\']++|\'\')*+\'|[\d-.]+)|(?:NOT )?IN\s*\((?>\'(?>[^\']++|\'\')*+\',? ?|[\d-.]+,? ?)*+\)))*+)$/', $query, $regs))
-						{
-							$query = $regs[1] . $this->_rewrite_where($regs[2]);
-							unset($regs);
-						}
-					break;
-
-					case 'UPDATE':
-						if (preg_match('/^(UPDATE [\\w_]++\\s+SET [\\w_]+\s*=\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]++|:\w++)(?:, [\\w_]+\s*=\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]++|:\w++))*+\\s+WHERE)(.*)$/s',  $query, $regs))
-						{
-							$query = $regs[1] . $this->_rewrite_where($regs[2]);
-							unset($regs);
-						}
-					break;
-
-					case 'SELECT':
-						$query = preg_replace_callback('/([\w_.]++)\s*(?:(=|<>)\s*(?>\'(?>[^\']++|\'\')*+\'|[\d-.]++|([\w_.]++))|(?:NOT )?IN\s*\((?>\'(?>[^\']++|\'\')*+\',? ?|[\d-.]++,? ?)*+\))/', array($this, '_rewrite_col_compare'), $query);
-					break;
-				}
-
-				$this->query_result = @ociparse($this->db_connect_id, $query);
-
-				foreach ($array as $key => $value)
-				{
-					@ocibindbyname($this->query_result, $key, $array[$key], -1);
-				}
-
-				$success = @ociexecute($this->query_result, OCI_DEFAULT);
-
-				if (!$success)
-				{
-					$this->sql_error($query);
-					$this->query_result = false;
-				}
-				else
-				{
-					if (!$in_transaction)
-					{
-						$this->sql_transaction('commit');
-					}
-				}
-
-				if (defined('DEBUG'))
-				{
-					$this->sql_report('stop', $query);
-				}
-
-				if ($cache && $cache_ttl)
-				{
-					$this->open_queries[(int) $this->query_result] = $this->query_result;
-					$this->query_result = $cache->sql_save($this, $query, $this->query_result, $cache_ttl);
-				}
-				else if (strpos($query, 'SELECT') === 0 && $this->query_result)
-				{
-					$this->open_queries[(int) $this->query_result] = $this->query_result;
-				}
-			}
-			else if (defined('DEBUG'))
-			{
-				$this->sql_report('fromcache', $query);
-			}
-		}
-		else
-		{
-			return false;
-		}
-
-		return $this->query_result;
-	}
-
-	/**
-	* Build LIMIT query
-	*/
-	function _sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)
-	{
-		$this->query_result = false;
-
-		$query = 'SELECT * FROM (SELECT /*+ FIRST_ROWS */ rownum AS xrownum, a.* FROM (' . $query . ') a WHERE rownum <= ' . ($offset + $total) . ') WHERE xrownum >= ' . $offset;
-
-		return $this->sql_query($query, $cache_ttl);
-	}
-
-	/**
-	* Return number of affected rows
-	*/
-	function sql_affectedrows()
-	{
-		return ($this->query_result) ? @ocirowcount($this->query_result) : false;
-	}
-
-	/**
-	* Fetch current row
-	*/
-	function sql_fetchrow($query_id = false)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache && $cache->sql_exists($query_id))
-		{
-			return $cache->sql_fetchrow($query_id);
-		}
-
-		if ($query_id !== false)
-		{
-			$row = array();
-			$result = @ocifetchinto($query_id, $row, OCI_ASSOC + OCI_RETURN_NULLS);
-
-			if (!$result || !$row)
-			{
-				return false;
-			}
-
-			$result_row = array();
-			foreach ($row as $key => $value)
-			{
-				// Oracle treats empty strings as null
-				if (is_null($value))
-				{
-					$value = '';
-				}
-
-				// OCI->CLOB?
-				if (is_object($value))
-				{
-					$value = $value->load();
-				}
-
-				$result_row[strtolower($key)] = $value;
-			}
-
-			return $result_row;
-		}
-
-		return false;
-	}
-
-	/**
-	* Seek to given row number
-	* rownum is zero-based
-	*/
-	function sql_rowseek($rownum, &$query_id)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache && $cache->sql_exists($query_id))
-		{
-			return $cache->sql_rowseek($rownum, $query_id);
-		}
-
-		if ($query_id === false)
-		{
-			return false;
-		}
-
-		// Reset internal pointer
-		@ociexecute($query_id, OCI_DEFAULT);
-
-		// We do not fetch the row for rownum == 0 because then the next resultset would be the second row
-		for ($i = 0; $i < $rownum; $i++)
-		{
-			if (!$this->sql_fetchrow($query_id))
-			{
-				return false;
-			}
-		}
-
-		return true;
-	}
-
-	/**
-	* Get last inserted id after insert statement
-	*/
-	function sql_nextid()
-	{
-		$query_id = $this->query_result;
-
-		if ($query_id !== false && $this->last_query_text != '')
-		{
-			if (preg_match('#^INSERT[\t\n ]+INTO[\t\n ]+([a-z0-9\_\-]+)#is', $this->last_query_text, $tablename))
-			{
-				$query = 'SELECT ' . $tablename[1] . '_seq.currval FROM DUAL';
-				$stmt = @ociparse($this->db_connect_id, $query);
-				@ociexecute($stmt, OCI_DEFAULT);
-
-				$temp_result = @ocifetchinto($stmt, $temp_array, OCI_ASSOC + OCI_RETURN_NULLS);
-				@ocifreestatement($stmt);
-
-				if ($temp_result)
-				{
-					return $temp_array['CURRVAL'];
-				}
-				else
-				{
-					return false;
-				}
-			}
-		}
-
-		return false;
-	}
-
-	/**
-	* Free sql result
-	*/
-	function sql_freeresult($query_id = false)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache && $cache->sql_exists($query_id))
-		{
-			return $cache->sql_freeresult($query_id);
-		}
-
-		if (isset($this->open_queries[(int) $query_id]))
-		{
-			unset($this->open_queries[(int) $query_id]);
-			return @ocifreestatement($query_id);
-		}
-
-		return false;
-	}
-
-	/**
-	* Escape string used in sql query
-	*/
-	function sql_escape($msg)
-	{
-		return str_replace(array("'", "\0"), array("''", ''), $msg);
-	}
-
-	/**
-	* Build LIKE expression
-	* @access private
-	*/
-	function _sql_like_expression($expression)
-	{
-		return $expression . " ESCAPE '\\'";
-	}
-
-	function _sql_custom_build($stage, $data)
-	{
-		return $data;
-	}
-
-	function _sql_bit_and($column_name, $bit, $compare = '')
-	{
-		return 'BITAND(' . $column_name . ', ' . (1 << $bit) . ')' . (($compare) ? ' ' . $compare : '');
-	}
-
-	function _sql_bit_or($column_name, $bit, $compare = '')
-	{
-		return 'BITOR(' . $column_name . ', ' . (1 << $bit) . ')' . (($compare) ? ' ' . $compare : '');
-	}
-
-	/**
-	* return sql error array
-	* @access private
-	*/
-	function _sql_error()
-	{
-		if (function_exists('ocierror'))
-		{
-			$error = @ocierror();
-			$error = (!$error) ? @ocierror($this->query_result) : $error;
-			$error = (!$error) ? @ocierror($this->db_connect_id) : $error;
-
-			if ($error)
-			{
-				$this->last_error_result = $error;
-			}
-			else
-			{
-				$error = (isset($this->last_error_result) && $this->last_error_result) ? $this->last_error_result : array();
-			}
-		}
-		else
-		{
-			$error = array(
-				'message'	=> $this->connect_error,
-				'code'		=> '',
-			);
-		}
-
-		return $error;
-	}
-
-	/**
-	* Close sql connection
-	* @access private
-	*/
-	function _sql_close()
-	{
-		return @ocilogoff($this->db_connect_id);
-	}
-
-	/**
-	* Build db-specific report
-	* @access private
-	*/
-	function _sql_report($mode, $query = '')
-	{
-		switch ($mode)
-		{
-			case 'start':
-
-				$html_table = false;
-
-				// Grab a plan table, any will do
-				$sql = "SELECT table_name
-					FROM USER_TABLES
-					WHERE table_name LIKE '%PLAN_TABLE%'";
-				$stmt = ociparse($this->db_connect_id, $sql);
-				ociexecute($stmt);
-				$result = array();
-
-				if (ocifetchinto($stmt, $result, OCI_ASSOC + OCI_RETURN_NULLS))
-				{
-					$table = $result['TABLE_NAME'];
-
-					// This is the statement_id that will allow us to track the plan
-					$statement_id = substr(md5($query), 0, 30);
-
-					// Remove any stale plans
-					$stmt2 = ociparse($this->db_connect_id, "DELETE FROM $table WHERE statement_id='$statement_id'");
-					ociexecute($stmt2);
-					ocifreestatement($stmt2);
-
-					// Explain the plan
-					$sql = "EXPLAIN PLAN
-						SET STATEMENT_ID = '$statement_id'
-						FOR $query";
-					$stmt2 = ociparse($this->db_connect_id, $sql);
-					ociexecute($stmt2);
-					ocifreestatement($stmt2);
-
-					// Get the data from the plan
-					$sql = "SELECT operation, options, object_name, object_type, cardinality, cost
-						FROM plan_table
-						START WITH id = 0 AND statement_id = '$statement_id'
-						CONNECT BY PRIOR id = parent_id
-							AND statement_id = '$statement_id'";
-					$stmt2 = ociparse($this->db_connect_id, $sql);
-					ociexecute($stmt2);
-
-					$row = array();
-					while (ocifetchinto($stmt2, $row, OCI_ASSOC + OCI_RETURN_NULLS))
-					{
-						$html_table = $this->sql_report('add_select_row', $query, $html_table, $row);
-					}
-
-					ocifreestatement($stmt2);
-
-					// Remove the plan we just made, we delete them on request anyway
-					$stmt2 = ociparse($this->db_connect_id, "DELETE FROM $table WHERE statement_id='$statement_id'");
-					ociexecute($stmt2);
-					ocifreestatement($stmt2);
-				}
-
-				ocifreestatement($stmt);
-
-				if ($html_table)
-				{
-					$this->html_hold .= '</table>';
-				}
-
-			break;
-
-			case 'fromcache':
-				$endtime = explode(' ', microtime());
-				$endtime = $endtime[0] + $endtime[1];
-
-				$result = @ociparse($this->db_connect_id, $query);
-				$success = @ociexecute($result, OCI_DEFAULT);
-				$row = array();
-
-				while (@ocifetchinto($result, $row, OCI_ASSOC + OCI_RETURN_NULLS))
-				{
-					// Take the time spent on parsing rows into account
-				}
-				@ocifreestatement($result);
-
-				$splittime = explode(' ', microtime());
-				$splittime = $splittime[0] + $splittime[1];
-
-				$this->sql_report('record_fromcache', $query, $endtime, $splittime);
-
-			break;
-		}
-	}
-}
diff --git a/phpBB/includes/db/driver/postgres.php b/phpBB/includes/db/driver/postgres.php
deleted file mode 100644
index 14854d179d..0000000000
--- a/phpBB/includes/db/driver/postgres.php
+++ /dev/null
@@ -1,491 +0,0 @@
-<?php
-/**
-*
-* @package dbal
-* @copyright (c) 2005 phpBB Group
-* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
-*
-*/
-
-/**
-* @ignore
-*/
-if (!defined('IN_PHPBB'))
-{
-	exit;
-}
-
-/**
-* PostgreSQL Database Abstraction Layer
-* Minimum Requirement is Version 7.3+
-* @package dbal
-*/
-class phpbb_db_driver_postgres extends phpbb_db_driver
-{
-	var $last_query_text = '';
-	var $connect_error = '';
-
-	/**
-	* Connect to server
-	*/
-	function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false)
-	{
-		$connect_string = '';
-
-		if ($sqluser)
-		{
-			$connect_string .= "user=$sqluser ";
-		}
-
-		if ($sqlpassword)
-		{
-			$connect_string .= "password=$sqlpassword ";
-		}
-
-		if ($sqlserver)
-		{
-			// $sqlserver can carry a port separated by : for compatibility reasons
-			// If $sqlserver has more than one : it's probably an IPv6 address.
-			// In this case we only allow passing a port via the $port variable.
-			if (substr_count($sqlserver, ':') === 1)
-			{
-				list($sqlserver, $port) = explode(':', $sqlserver);
-			}
-
-			if ($sqlserver !== 'localhost')
-			{
-				$connect_string .= "host=$sqlserver ";
-			}
-
-			if ($port)
-			{
-				$connect_string .= "port=$port ";
-			}
-		}
-
-		$schema = '';
-
-		if ($database)
-		{
-			$this->dbname = $database;
-			if (strpos($database, '.') !== false)
-			{
-				list($database, $schema) = explode('.', $database);
-			}
-			$connect_string .= "dbname=$database";
-		}
-
-		$this->persistency = $persistency;
-
-		if ($this->persistency)
-		{
-			if (!function_exists('pg_pconnect'))
-			{
-				$this->connect_error = 'pg_pconnect function does not exist, is pgsql extension installed?';
-				return $this->sql_error('');
-			}
-			$collector = new phpbb_error_collector;
-			$collector->install();
-			$this->db_connect_id = (!$new_link) ? @pg_pconnect($connect_string) : @pg_pconnect($connect_string, PGSQL_CONNECT_FORCE_NEW);
-		}
-		else
-		{
-			if (!function_exists('pg_connect'))
-			{
-				$this->connect_error = 'pg_connect function does not exist, is pgsql extension installed?';
-				return $this->sql_error('');
-			}
-			$collector = new phpbb_error_collector;
-			$collector->install();
-			$this->db_connect_id = (!$new_link) ? @pg_connect($connect_string) : @pg_connect($connect_string, PGSQL_CONNECT_FORCE_NEW);
-		}
-
-		$collector->uninstall();
-
-		if ($this->db_connect_id)
-		{
-			if (version_compare($this->sql_server_info(true), '8.2', '>='))
-			{
-				$this->multi_insert = true;
-			}
-
-			if ($schema !== '')
-			{
-				@pg_query($this->db_connect_id, 'SET search_path TO ' . $schema);
-			}
-			return $this->db_connect_id;
-		}
-
-		$this->connect_error = $collector->format_errors();
-		return $this->sql_error('');
-	}
-
-	/**
-	* Version information about used database
-	* @param bool $raw if true, only return the fetched sql_server_version
-	* @param bool $use_cache If true, it is safe to retrieve the value from the cache
-	* @return string sql server version
-	*/
-	function sql_server_info($raw = false, $use_cache = true)
-	{
-		global $cache;
-
-		if (!$use_cache || empty($cache) || ($this->sql_server_version = $cache->get('pgsql_version')) === false)
-		{
-			$query_id = @pg_query($this->db_connect_id, 'SELECT VERSION() AS version');
-			$row = @pg_fetch_assoc($query_id, null);
-			@pg_free_result($query_id);
-
-			$this->sql_server_version = (!empty($row['version'])) ? trim(substr($row['version'], 10)) : 0;
-
-			if (!empty($cache) && $use_cache)
-			{
-				$cache->put('pgsql_version', $this->sql_server_version);
-			}
-		}
-
-		return ($raw) ? $this->sql_server_version : 'PostgreSQL ' . $this->sql_server_version;
-	}
-
-	/**
-	* SQL Transaction
-	* @access private
-	*/
-	function _sql_transaction($status = 'begin')
-	{
-		switch ($status)
-		{
-			case 'begin':
-				return @pg_query($this->db_connect_id, 'BEGIN');
-			break;
-
-			case 'commit':
-				return @pg_query($this->db_connect_id, 'COMMIT');
-			break;
-
-			case 'rollback':
-				return @pg_query($this->db_connect_id, 'ROLLBACK');
-			break;
-		}
-
-		return true;
-	}
-
-	/**
-	* Base query method
-	*
-	* @param	string	$query		Contains the SQL query which shall be executed
-	* @param	int		$cache_ttl	Either 0 to avoid caching or the time in seconds which the result shall be kept in cache
-	* @return	mixed				When casted to bool the returned value returns true on success and false on failure
-	*
-	* @access	public
-	*/
-	function sql_query($query = '', $cache_ttl = 0)
-	{
-		if ($query != '')
-		{
-			global $cache;
-
-			// EXPLAIN only in extra debug mode
-			if (defined('DEBUG'))
-			{
-				$this->sql_report('start', $query);
-			}
-
-			$this->last_query_text = $query;
-			$this->query_result = ($cache && $cache_ttl) ? $cache->sql_load($query) : false;
-			$this->sql_add_num_queries($this->query_result);
-
-			if ($this->query_result === false)
-			{
-				if (($this->query_result = @pg_query($this->db_connect_id, $query)) === false)
-				{
-					$this->sql_error($query);
-				}
-
-				if (defined('DEBUG'))
-				{
-					$this->sql_report('stop', $query);
-				}
-
-				if ($cache && $cache_ttl)
-				{
-					$this->open_queries[(int) $this->query_result] = $this->query_result;
-					$this->query_result = $cache->sql_save($this, $query, $this->query_result, $cache_ttl);
-				}
-				else if (strpos($query, 'SELECT') === 0 && $this->query_result)
-				{
-					$this->open_queries[(int) $this->query_result] = $this->query_result;
-				}
-			}
-			else if (defined('DEBUG'))
-			{
-				$this->sql_report('fromcache', $query);
-			}
-		}
-		else
-		{
-			return false;
-		}
-
-		return $this->query_result;
-	}
-
-	/**
-	* Build db-specific query data
-	* @access private
-	*/
-	function _sql_custom_build($stage, $data)
-	{
-		return $data;
-	}
-
-	/**
-	* Build LIMIT query
-	*/
-	function _sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)
-	{
-		$this->query_result = false;
-
-		// if $total is set to 0 we do not want to limit the number of rows
-		if ($total == 0)
-		{
-			$total = 'ALL';
-		}
-
-		$query .= "\n LIMIT $total OFFSET $offset";
-
-		return $this->sql_query($query, $cache_ttl);
-	}
-
-	/**
-	* Return number of affected rows
-	*/
-	function sql_affectedrows()
-	{
-		return ($this->query_result) ? @pg_affected_rows($this->query_result) : false;
-	}
-
-	/**
-	* Fetch current row
-	*/
-	function sql_fetchrow($query_id = false)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache && $cache->sql_exists($query_id))
-		{
-			return $cache->sql_fetchrow($query_id);
-		}
-
-		return ($query_id !== false) ? @pg_fetch_assoc($query_id, null) : false;
-	}
-
-	/**
-	* Seek to given row number
-	* rownum is zero-based
-	*/
-	function sql_rowseek($rownum, &$query_id)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache && $cache->sql_exists($query_id))
-		{
-			return $cache->sql_rowseek($rownum, $query_id);
-		}
-
-		return ($query_id !== false) ? @pg_result_seek($query_id, $rownum) : false;
-	}
-
-	/**
-	* Get last inserted id after insert statement
-	*/
-	function sql_nextid()
-	{
-		$query_id = $this->query_result;
-
-		if ($query_id !== false && $this->last_query_text != '')
-		{
-			if (preg_match("/^INSERT[\t\n ]+INTO[\t\n ]+([a-z0-9\_\-]+)/is", $this->last_query_text, $tablename))
-			{
-				$query = "SELECT currval('" . $tablename[1] . "_seq') AS last_value";
-				$temp_q_id = @pg_query($this->db_connect_id, $query);
-
-				if (!$temp_q_id)
-				{
-					return false;
-				}
-
-				$temp_result = @pg_fetch_assoc($temp_q_id, NULL);
-				@pg_free_result($query_id);
-
-				return ($temp_result) ? $temp_result['last_value'] : false;
-			}
-		}
-
-		return false;
-	}
-
-	/**
-	* Free sql result
-	*/
-	function sql_freeresult($query_id = false)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache && $cache->sql_exists($query_id))
-		{
-			return $cache->sql_freeresult($query_id);
-		}
-
-		if (isset($this->open_queries[(int) $query_id]))
-		{
-			unset($this->open_queries[(int) $query_id]);
-			return @pg_free_result($query_id);
-		}
-
-		return false;
-	}
-
-	/**
-	* Escape string used in sql query
-	* Note: Do not use for bytea values if we may use them at a later stage
-	*/
-	function sql_escape($msg)
-	{
-		return @pg_escape_string($msg);
-	}
-
-	/**
-	* Build LIKE expression
-	* @access private
-	*/
-	function _sql_like_expression($expression)
-	{
-		return $expression;
-	}
-
-	/**
-	* @inheritdoc
-	*/
-	function cast_expr_to_bigint($expression)
-	{
-		return 'CAST(' . $expression . ' as DECIMAL(255, 0))';
-	}
-
-	/**
-	* @inheritdoc
-	*/
-	function cast_expr_to_string($expression)
-	{
-		return 'CAST(' . $expression . ' as VARCHAR(255))';
-	}
-
-	/**
-	* return sql error array
-	* @access private
-	*/
-	function _sql_error()
-	{
-		// pg_last_error only works when there is an established connection.
-		// Connection errors have to be tracked by us manually.
-		if ($this->db_connect_id)
-		{
-			$message = @pg_last_error($this->db_connect_id);
-		}
-		else
-		{
-			$message = $this->connect_error;
-		}
-
-		return array(
-			'message'	=> $message,
-			'code'		=> ''
-		);
-	}
-
-	/**
-	* Close sql connection
-	* @access private
-	*/
-	function _sql_close()
-	{
-		return @pg_close($this->db_connect_id);
-	}
-
-	/**
-	* Build db-specific report
-	* @access private
-	*/
-	function _sql_report($mode, $query = '')
-	{
-		switch ($mode)
-		{
-			case 'start':
-
-				$explain_query = $query;
-				if (preg_match('/UPDATE ([a-z0-9_]+).*?WHERE(.*)/s', $query, $m))
-				{
-					$explain_query = 'SELECT * FROM ' . $m[1] . ' WHERE ' . $m[2];
-				}
-				else if (preg_match('/DELETE FROM ([a-z0-9_]+).*?WHERE(.*)/s', $query, $m))
-				{
-					$explain_query = 'SELECT * FROM ' . $m[1] . ' WHERE ' . $m[2];
-				}
-
-				if (preg_match('/^SELECT/', $explain_query))
-				{
-					$html_table = false;
-
-					if ($result = @pg_query($this->db_connect_id, "EXPLAIN $explain_query"))
-					{
-						while ($row = @pg_fetch_assoc($result, NULL))
-						{
-							$html_table = $this->sql_report('add_select_row', $query, $html_table, $row);
-						}
-					}
-					@pg_free_result($result);
-
-					if ($html_table)
-					{
-						$this->html_hold .= '</table>';
-					}
-				}
-
-			break;
-
-			case 'fromcache':
-				$endtime = explode(' ', microtime());
-				$endtime = $endtime[0] + $endtime[1];
-
-				$result = @pg_query($this->db_connect_id, $query);
-				while ($void = @pg_fetch_assoc($result, NULL))
-				{
-					// Take the time spent on parsing rows into account
-				}
-				@pg_free_result($result);
-
-				$splittime = explode(' ', microtime());
-				$splittime = $splittime[0] + $splittime[1];
-
-				$this->sql_report('record_fromcache', $query, $endtime, $splittime);
-
-			break;
-		}
-	}
-}
diff --git a/phpBB/includes/db/driver/sqlite.php b/phpBB/includes/db/driver/sqlite.php
deleted file mode 100644
index 7188f0daa2..0000000000
--- a/phpBB/includes/db/driver/sqlite.php
+++ /dev/null
@@ -1,365 +0,0 @@
-<?php
-/**
-*
-* @package dbal
-* @copyright (c) 2005 phpBB Group
-* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
-*
-*/
-
-/**
-* @ignore
-*/
-if (!defined('IN_PHPBB'))
-{
-	exit;
-}
-
-/**
-* Sqlite Database Abstraction Layer
-* Minimum Requirement: 2.8.2+
-* @package dbal
-*/
-class phpbb_db_driver_sqlite extends phpbb_db_driver
-{
-	var $connect_error = '';
-
-	/**
-	* Connect to server
-	*/
-	function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false)
-	{
-		$this->persistency = $persistency;
-		$this->user = $sqluser;
-		$this->server = $sqlserver . (($port) ? ':' . $port : '');
-		$this->dbname = $database;
-
-		$error = '';
-		if ($this->persistency)
-		{
-			if (!function_exists('sqlite_popen'))
-			{
-				$this->connect_error = 'sqlite_popen function does not exist, is sqlite extension installed?';
-				return $this->sql_error('');
-			}
-			$this->db_connect_id = @sqlite_popen($this->server, 0666, $error);
-		}
-		else
-		{
-			if (!function_exists('sqlite_open'))
-			{
-				$this->connect_error = 'sqlite_open function does not exist, is sqlite extension installed?';
-				return $this->sql_error('');
-			}
-			$this->db_connect_id = @sqlite_open($this->server, 0666, $error);
-		}
-
-		if ($this->db_connect_id)
-		{
-			@sqlite_query('PRAGMA short_column_names = 1', $this->db_connect_id);
-//			@sqlite_query('PRAGMA encoding = "UTF-8"', $this->db_connect_id);
-		}
-
-		return ($this->db_connect_id) ? true : array('message' => $error);
-	}
-
-	/**
-	* Version information about used database
-	* @param bool $raw if true, only return the fetched sql_server_version
-	* @param bool $use_cache if true, it is safe to retrieve the stored value from the cache
-	* @return string sql server version
-	*/
-	function sql_server_info($raw = false, $use_cache = true)
-	{
-		global $cache;
-
-		if (!$use_cache || empty($cache) || ($this->sql_server_version = $cache->get('sqlite_version')) === false)
-		{
-			$result = @sqlite_query('SELECT sqlite_version() AS version', $this->db_connect_id);
-			$row = @sqlite_fetch_array($result, SQLITE_ASSOC);
-
-			$this->sql_server_version = (!empty($row['version'])) ? $row['version'] : 0;
-
-			if (!empty($cache) && $use_cache)
-			{
-				$cache->put('sqlite_version', $this->sql_server_version);
-			}
-		}
-
-		return ($raw) ? $this->sql_server_version : 'SQLite ' . $this->sql_server_version;
-	}
-
-	/**
-	* SQL Transaction
-	* @access private
-	*/
-	function _sql_transaction($status = 'begin')
-	{
-		switch ($status)
-		{
-			case 'begin':
-				return @sqlite_query('BEGIN', $this->db_connect_id);
-			break;
-
-			case 'commit':
-				return @sqlite_query('COMMIT', $this->db_connect_id);
-			break;
-
-			case 'rollback':
-				return @sqlite_query('ROLLBACK', $this->db_connect_id);
-			break;
-		}
-
-		return true;
-	}
-
-	/**
-	* Base query method
-	*
-	* @param	string	$query		Contains the SQL query which shall be executed
-	* @param	int		$cache_ttl	Either 0 to avoid caching or the time in seconds which the result shall be kept in cache
-	* @return	mixed				When casted to bool the returned value returns true on success and false on failure
-	*
-	* @access	public
-	*/
-	function sql_query($query = '', $cache_ttl = 0)
-	{
-		if ($query != '')
-		{
-			global $cache;
-
-			// EXPLAIN only in extra debug mode
-			if (defined('DEBUG'))
-			{
-				$this->sql_report('start', $query);
-			}
-
-			$this->query_result = ($cache && $cache_ttl) ? $cache->sql_load($query) : false;
-			$this->sql_add_num_queries($this->query_result);
-
-			if ($this->query_result === false)
-			{
-				if (($this->query_result = @sqlite_query($query, $this->db_connect_id)) === false)
-				{
-					$this->sql_error($query);
-				}
-
-				if (defined('DEBUG'))
-				{
-					$this->sql_report('stop', $query);
-				}
-
-				if ($cache && $cache_ttl)
-				{
-					$this->open_queries[(int) $this->query_result] = $this->query_result;
-					$this->query_result = $cache->sql_save($this, $query, $this->query_result, $cache_ttl);
-				}
-				else if (strpos($query, 'SELECT') === 0 && $this->query_result)
-				{
-					$this->open_queries[(int) $this->query_result] = $this->query_result;
-				}
-			}
-			else if (defined('DEBUG'))
-			{
-				$this->sql_report('fromcache', $query);
-			}
-		}
-		else
-		{
-			return false;
-		}
-
-		return $this->query_result;
-	}
-
-	/**
-	* Build LIMIT query
-	*/
-	function _sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)
-	{
-		$this->query_result = false;
-
-		// if $total is set to 0 we do not want to limit the number of rows
-		if ($total == 0)
-		{
-			$total = -1;
-		}
-
-		$query .= "\n LIMIT " . ((!empty($offset)) ? $offset . ', ' . $total : $total);
-
-		return $this->sql_query($query, $cache_ttl);
-	}
-
-	/**
-	* Return number of affected rows
-	*/
-	function sql_affectedrows()
-	{
-		return ($this->db_connect_id) ? @sqlite_changes($this->db_connect_id) : false;
-	}
-
-	/**
-	* Fetch current row
-	*/
-	function sql_fetchrow($query_id = false)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache && $cache->sql_exists($query_id))
-		{
-			return $cache->sql_fetchrow($query_id);
-		}
-
-		return ($query_id !== false) ? @sqlite_fetch_array($query_id, SQLITE_ASSOC) : false;
-	}
-
-	/**
-	* Seek to given row number
-	* rownum is zero-based
-	*/
-	function sql_rowseek($rownum, &$query_id)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache && $cache->sql_exists($query_id))
-		{
-			return $cache->sql_rowseek($rownum, $query_id);
-		}
-
-		return ($query_id !== false) ? @sqlite_seek($query_id, $rownum) : false;
-	}
-
-	/**
-	* Get last inserted id after insert statement
-	*/
-	function sql_nextid()
-	{
-		return ($this->db_connect_id) ? @sqlite_last_insert_rowid($this->db_connect_id) : false;
-	}
-
-	/**
-	* Free sql result
-	*/
-	function sql_freeresult($query_id = false)
-	{
-		global $cache;
-
-		if ($query_id === false)
-		{
-			$query_id = $this->query_result;
-		}
-
-		if ($cache && $cache->sql_exists($query_id))
-		{
-			return $cache->sql_freeresult($query_id);
-		}
-
-		return true;
-	}
-
-	/**
-	* Escape string used in sql query
-	*/
-	function sql_escape($msg)
-	{
-		return @sqlite_escape_string($msg);
-	}
-
-	/**
-	* Correctly adjust LIKE expression for special characters
-	* For SQLite an underscore is a not-known character... this may change with SQLite3
-	*/
-	function sql_like_expression($expression)
-	{
-		// Unlike LIKE, GLOB is case sensitive (unfortunatly). SQLite users need to live with it!
-		// We only catch * and ? here, not the character map possible on file globbing.
-		$expression = str_replace(array(chr(0) . '_', chr(0) . '%'), array(chr(0) . '?', chr(0) . '*'), $expression);
-
-		$expression = str_replace(array('?', '*'), array("\?", "\*"), $expression);
-		$expression = str_replace(array(chr(0) . "\?", chr(0) . "\*"), array('?', '*'), $expression);
-
-		return 'GLOB \'' . $this->sql_escape($expression) . '\'';
-	}
-
-	/**
-	* return sql error array
-	* @access private
-	*/
-	function _sql_error()
-	{
-		if (function_exists('sqlite_error_string'))
-		{
-			$error = array(
-				'message'	=> @sqlite_error_string(@sqlite_last_error($this->db_connect_id)),
-				'code'		=> @sqlite_last_error($this->db_connect_id),
-			);
-		}
-		else
-		{
-			$error = array(
-				'message'	=> $this->connect_error,
-				'code'		=> '',
-			);
-		}
-
-		return $error;
-	}
-
-	/**
-	* Build db-specific query data
-	* @access private
-	*/
-	function _sql_custom_build($stage, $data)
-	{
-		return $data;
-	}
-
-	/**
-	* Close sql connection
-	* @access private
-	*/
-	function _sql_close()
-	{
-		return @sqlite_close($this->db_connect_id);
-	}
-
-	/**
-	* Build db-specific report
-	* @access private
-	*/
-	function _sql_report($mode, $query = '')
-	{
-		switch ($mode)
-		{
-			case 'start':
-			break;
-
-			case 'fromcache':
-				$endtime = explode(' ', microtime());
-				$endtime = $endtime[0] + $endtime[1];
-
-				$result = @sqlite_query($query, $this->db_connect_id);
-				while ($void = @sqlite_fetch_array($result, SQLITE_ASSOC))
-				{
-					// Take the time spent on parsing rows into account
-				}
-
-				$splittime = explode(' ', microtime());
-				$splittime = $splittime[0] + $splittime[1];
-
-				$this->sql_report('record_fromcache', $query, $endtime, $splittime);
-
-			break;
-		}
-	}
-}