1 files changed, 3 insertions, 2822 deletions
diff --git a/phpBB/phpbb/db/tools.php b/phpBB/phpbb/db/tools.php
index 832a0c510c..4d1b91f7b4 100644
--- a/phpBB/phpbb/db/tools.php
+++ b/phpBB/phpbb/db/tools.php
@@ -14,2827 +14,8 @@
 namespace phpbb\db;
 
 /**
-* Database Tools for handling cross-db actions such as altering columns, etc.
-* Currently not supported is returning SQL for creating tables.
-*/
-class tools
+ * @deprecated	3.2.0-dev	(To be removed 3.3.0) use \phpbb\db\tools\tools instead
+ */
+class tools extends \phpbb\db\tools\tools
 {
-	/**
-	* Current sql layer
-	*/
-	var $sql_layer = '';
-
-	/**
-	* @var object DB object
-	*/
-	var $db = null;
-
-	/**
-	* The Column types for every database we support
-	* @var array
-	*/
-	var $dbms_type_map = array();
-
-	/**
-	* Is the used MS SQL Server a SQL Server 2000?
-	* @var bool
-	*/
-	protected $is_sql_server_2000;
-
-	/**
-	* Get the column types for every database we support
-	*
-	* @return array
-	*/
-	public static function get_dbms_type_map()
-	{
-		return array(
-			'mysql_41'	=> array(
-				'INT:'		=> 'int(%d)',
-				'BINT'		=> 'bigint(20)',
-				'UINT'		=> 'mediumint(8) UNSIGNED',
-				'UINT:'		=> 'int(%d) UNSIGNED',
-				'TINT:'		=> 'tinyint(%d)',
-				'USINT'		=> 'smallint(4) UNSIGNED',
-				'BOOL'		=> 'tinyint(1) UNSIGNED',
-				'VCHAR'		=> 'varchar(255)',
-				'VCHAR:'	=> 'varchar(%d)',
-				'CHAR:'		=> 'char(%d)',
-				'XSTEXT'	=> 'text',
-				'XSTEXT_UNI'=> 'varchar(100)',
-				'STEXT'		=> 'text',
-				'STEXT_UNI'	=> 'varchar(255)',
-				'TEXT'		=> 'text',
-				'TEXT_UNI'	=> 'text',
-				'MTEXT'		=> 'mediumtext',
-				'MTEXT_UNI'	=> 'mediumtext',
-				'TIMESTAMP'	=> 'int(11) UNSIGNED',
-				'DECIMAL'	=> 'decimal(5,2)',
-				'DECIMAL:'	=> 'decimal(%d,2)',
-				'PDECIMAL'	=> 'decimal(6,3)',
-				'PDECIMAL:'	=> 'decimal(%d,3)',
-				'VCHAR_UNI'	=> 'varchar(255)',
-				'VCHAR_UNI:'=> 'varchar(%d)',
-				'VCHAR_CI'	=> 'varchar(255)',
-				'VARBINARY'	=> 'varbinary(255)',
-			),
-
-			'mysql_40'	=> array(
-				'INT:'		=> 'int(%d)',
-				'BINT'		=> 'bigint(20)',
-				'UINT'		=> 'mediumint(8) UNSIGNED',
-				'UINT:'		=> 'int(%d) UNSIGNED',
-				'TINT:'		=> 'tinyint(%d)',
-				'USINT'		=> 'smallint(4) UNSIGNED',
-				'BOOL'		=> 'tinyint(1) UNSIGNED',
-				'VCHAR'		=> 'varbinary(255)',
-				'VCHAR:'	=> 'varbinary(%d)',
-				'CHAR:'		=> 'binary(%d)',
-				'XSTEXT'	=> 'blob',
-				'XSTEXT_UNI'=> 'blob',
-				'STEXT'		=> 'blob',
-				'STEXT_UNI'	=> 'blob',
-				'TEXT'		=> 'blob',
-				'TEXT_UNI'	=> 'blob',
-				'MTEXT'		=> 'mediumblob',
-				'MTEXT_UNI'	=> 'mediumblob',
-				'TIMESTAMP'	=> 'int(11) UNSIGNED',
-				'DECIMAL'	=> 'decimal(5,2)',
-				'DECIMAL:'	=> 'decimal(%d,2)',
-				'PDECIMAL'	=> 'decimal(6,3)',
-				'PDECIMAL:'	=> 'decimal(%d,3)',
-				'VCHAR_UNI'	=> 'blob',
-				'VCHAR_UNI:'=> array('varbinary(%d)', 'limit' => array('mult', 3, 255, 'blob')),
-				'VCHAR_CI'	=> 'blob',
-				'VARBINARY'	=> 'varbinary(255)',
-			),
-
-			'mssql'		=> array(
-				'INT:'		=> '[int]',
-				'BINT'		=> '[float]',
-				'UINT'		=> '[int]',
-				'UINT:'		=> '[int]',
-				'TINT:'		=> '[int]',
-				'USINT'		=> '[int]',
-				'BOOL'		=> '[int]',
-				'VCHAR'		=> '[varchar] (255)',
-				'VCHAR:'	=> '[varchar] (%d)',
-				'CHAR:'		=> '[char] (%d)',
-				'XSTEXT'	=> '[varchar] (1000)',
-				'STEXT'		=> '[varchar] (3000)',
-				'TEXT'		=> '[varchar] (8000)',
-				'MTEXT'		=> '[text]',
-				'XSTEXT_UNI'=> '[varchar] (100)',
-				'STEXT_UNI'	=> '[varchar] (255)',
-				'TEXT_UNI'	=> '[varchar] (4000)',
-				'MTEXT_UNI'	=> '[text]',
-				'TIMESTAMP'	=> '[int]',
-				'DECIMAL'	=> '[float]',
-				'DECIMAL:'	=> '[float]',
-				'PDECIMAL'	=> '[float]',
-				'PDECIMAL:'	=> '[float]',
-				'VCHAR_UNI'	=> '[varchar] (255)',
-				'VCHAR_UNI:'=> '[varchar] (%d)',
-				'VCHAR_CI'	=> '[varchar] (255)',
-				'VARBINARY'	=> '[varchar] (255)',
-			),
-
-			'mssqlnative'	=> array(
-				'INT:'		=> '[int]',
-				'BINT'		=> '[float]',
-				'UINT'		=> '[int]',
-				'UINT:'		=> '[int]',
-				'TINT:'		=> '[int]',
-				'USINT'		=> '[int]',
-				'BOOL'		=> '[int]',
-				'VCHAR'		=> '[varchar] (255)',
-				'VCHAR:'	=> '[varchar] (%d)',
-				'CHAR:'		=> '[char] (%d)',
-				'XSTEXT'	=> '[varchar] (1000)',
-				'STEXT'		=> '[varchar] (3000)',
-				'TEXT'		=> '[varchar] (8000)',
-				'MTEXT'		=> '[text]',
-				'XSTEXT_UNI'=> '[varchar] (100)',
-				'STEXT_UNI'	=> '[varchar] (255)',
-				'TEXT_UNI'	=> '[varchar] (4000)',
-				'MTEXT_UNI'	=> '[text]',
-				'TIMESTAMP'	=> '[int]',
-				'DECIMAL'	=> '[float]',
-				'DECIMAL:'	=> '[float]',
-				'PDECIMAL'	=> '[float]',
-				'PDECIMAL:'	=> '[float]',
-				'VCHAR_UNI'	=> '[varchar] (255)',
-				'VCHAR_UNI:'=> '[varchar] (%d)',
-				'VCHAR_CI'	=> '[varchar] (255)',
-				'VARBINARY'	=> '[varchar] (255)',
-			),
-
-			'oracle'	=> array(
-				'INT:'		=> 'number(%d)',
-				'BINT'		=> 'number(20)',
-				'UINT'		=> 'number(8)',
-				'UINT:'		=> 'number(%d)',
-				'TINT:'		=> 'number(%d)',
-				'USINT'		=> 'number(4)',
-				'BOOL'		=> 'number(1)',
-				'VCHAR'		=> 'varchar2(255)',
-				'VCHAR:'	=> 'varchar2(%d)',
-				'CHAR:'		=> 'char(%d)',
-				'XSTEXT'	=> 'varchar2(1000)',
-				'STEXT'		=> 'varchar2(3000)',
-				'TEXT'		=> 'clob',
-				'MTEXT'		=> 'clob',
-				'XSTEXT_UNI'=> 'varchar2(300)',
-				'STEXT_UNI'	=> 'varchar2(765)',
-				'TEXT_UNI'	=> 'clob',
-				'MTEXT_UNI'	=> 'clob',
-				'TIMESTAMP'	=> 'number(11)',
-				'DECIMAL'	=> 'number(5, 2)',
-				'DECIMAL:'	=> 'number(%d, 2)',
-				'PDECIMAL'	=> 'number(6, 3)',
-				'PDECIMAL:'	=> 'number(%d, 3)',
-				'VCHAR_UNI'	=> 'varchar2(765)',
-				'VCHAR_UNI:'=> array('varchar2(%d)', 'limit' => array('mult', 3, 765, 'clob')),
-				'VCHAR_CI'	=> 'varchar2(255)',
-				'VARBINARY'	=> 'raw(255)',
-			),
-
-			'sqlite'	=> array(
-				'INT:'		=> 'int(%d)',
-				'BINT'		=> 'bigint(20)',
-				'UINT'		=> 'INTEGER UNSIGNED', //'mediumint(8) UNSIGNED',
-				'UINT:'		=> 'INTEGER UNSIGNED', // 'int(%d) UNSIGNED',
-				'TINT:'		=> 'tinyint(%d)',
-				'USINT'		=> 'INTEGER UNSIGNED', //'mediumint(4) UNSIGNED',
-				'BOOL'		=> 'INTEGER UNSIGNED', //'tinyint(1) UNSIGNED',
-				'VCHAR'		=> 'varchar(255)',
-				'VCHAR:'	=> 'varchar(%d)',
-				'CHAR:'		=> 'char(%d)',
-				'XSTEXT'	=> 'text(65535)',
-				'STEXT'		=> 'text(65535)',
-				'TEXT'		=> 'text(65535)',
-				'MTEXT'		=> 'mediumtext(16777215)',
-				'XSTEXT_UNI'=> 'text(65535)',
-				'STEXT_UNI'	=> 'text(65535)',
-				'TEXT_UNI'	=> 'text(65535)',
-				'MTEXT_UNI'	=> 'mediumtext(16777215)',
-				'TIMESTAMP'	=> 'INTEGER UNSIGNED', //'int(11) UNSIGNED',
-				'DECIMAL'	=> 'decimal(5,2)',
-				'DECIMAL:'	=> 'decimal(%d,2)',
-				'PDECIMAL'	=> 'decimal(6,3)',
-				'PDECIMAL:'	=> 'decimal(%d,3)',
-				'VCHAR_UNI'	=> 'varchar(255)',
-				'VCHAR_UNI:'=> 'varchar(%d)',
-				'VCHAR_CI'	=> 'varchar(255)',
-				'VARBINARY'	=> 'blob',
-			),
-
-			'sqlite3'	=> array(
-				'INT:'		=> 'INT(%d)',
-				'BINT'		=> 'BIGINT(20)',
-				'UINT'		=> 'INTEGER UNSIGNED',
-				'UINT:'		=> 'INTEGER UNSIGNED',
-				'TINT:'		=> 'TINYINT(%d)',
-				'USINT'		=> 'INTEGER UNSIGNED',
-				'BOOL'		=> 'INTEGER UNSIGNED',
-				'VCHAR'		=> 'VARCHAR(255)',
-				'VCHAR:'	=> 'VARCHAR(%d)',
-				'CHAR:'		=> 'CHAR(%d)',
-				'XSTEXT'	=> 'TEXT(65535)',
-				'STEXT'		=> 'TEXT(65535)',
-				'TEXT'		=> 'TEXT(65535)',
-				'MTEXT'		=> 'MEDIUMTEXT(16777215)',
-				'XSTEXT_UNI'=> 'TEXT(65535)',
-				'STEXT_UNI'	=> 'TEXT(65535)',
-				'TEXT_UNI'	=> 'TEXT(65535)',
-				'MTEXT_UNI'	=> 'MEDIUMTEXT(16777215)',
-				'TIMESTAMP'	=> 'INTEGER UNSIGNED', //'int(11) UNSIGNED',
-				'DECIMAL'	=> 'DECIMAL(5,2)',
-				'DECIMAL:'	=> 'DECIMAL(%d,2)',
-				'PDECIMAL'	=> 'DECIMAL(6,3)',
-				'PDECIMAL:'	=> 'DECIMAL(%d,3)',
-				'VCHAR_UNI'	=> 'VARCHAR(255)',
-				'VCHAR_UNI:'=> 'VARCHAR(%d)',
-				'VCHAR_CI'	=> 'VARCHAR(255)',
-				'VARBINARY'	=> 'BLOB',
-			),
-
-			'postgres'	=> array(
-				'INT:'		=> 'INT4',
-				'BINT'		=> 'INT8',
-				'UINT'		=> 'INT4', // unsigned
-				'UINT:'		=> 'INT4', // unsigned
-				'USINT'		=> 'INT2', // unsigned
-				'BOOL'		=> 'INT2', // unsigned
-				'TINT:'		=> 'INT2',
-				'VCHAR'		=> 'varchar(255)',
-				'VCHAR:'	=> 'varchar(%d)',
-				'CHAR:'		=> 'char(%d)',
-				'XSTEXT'	=> 'varchar(1000)',
-				'STEXT'		=> 'varchar(3000)',
-				'TEXT'		=> 'varchar(8000)',
-				'MTEXT'		=> 'TEXT',
-				'XSTEXT_UNI'=> 'varchar(100)',
-				'STEXT_UNI'	=> 'varchar(255)',
-				'TEXT_UNI'	=> 'varchar(4000)',
-				'MTEXT_UNI'	=> 'TEXT',
-				'TIMESTAMP'	=> 'INT4', // unsigned
-				'DECIMAL'	=> 'decimal(5,2)',
-				'DECIMAL:'	=> 'decimal(%d,2)',
-				'PDECIMAL'	=> 'decimal(6,3)',
-				'PDECIMAL:'	=> 'decimal(%d,3)',
-				'VCHAR_UNI'	=> 'varchar(255)',
-				'VCHAR_UNI:'=> 'varchar(%d)',
-				'VCHAR_CI'	=> 'varchar_ci',
-				'VARBINARY'	=> 'bytea',
-			),
-		);
-	}
-
-	/**
-	* A list of types being unsigned for better reference in some db's
-	* @var array
-	*/
-	var $unsigned_types = array('UINT', 'UINT:', 'USINT', 'BOOL', 'TIMESTAMP');
-
-	/**
-	* A list of supported DBMS. We change this class to support more DBMS, the DBMS itself only need to follow some rules.
-	* @var array
-	*/
-	var $supported_dbms = array('mssql', 'mssqlnative', 'mysql_40', 'mysql_41', 'oracle', 'postgres', 'sqlite', 'sqlite3');
-
-	/**
-	* This is set to true if user only wants to return the 'to-be-executed' SQL statement(s) (as an array).
-	* This mode has no effect on some methods (inserting of data for example). This is expressed within the methods command.
-	*/
-	var $return_statements = false;
-
-	/**
-	* Constructor. Set DB Object and set {@link $return_statements return_statements}.
-	*
-	* @param \phpbb\db\driver\driver_interface	$db					Database connection
-	* @param bool		$return_statements	True if only statements should be returned and no SQL being executed
-	*/
-	public function __construct(\phpbb\db\driver\driver_interface $db, $return_statements = false)
-	{
-		$this->db = $db;
-		$this->return_statements = $return_statements;
-
-		$this->dbms_type_map = self::get_dbms_type_map();
-
-		// Determine mapping database type
-		switch ($this->db->get_sql_layer())
-		{
-			case 'mysql':
-				$this->sql_layer = 'mysql_40';
-			break;
-
-			case 'mysql4':
-				if (version_compare($this->db->sql_server_info(true), '4.1.3', '>='))
-				{
-					$this->sql_layer = 'mysql_41';
-				}
-				else
-				{
-					$this->sql_layer = 'mysql_40';
-				}
-			break;
-
-			case 'mysqli':
-				$this->sql_layer = 'mysql_41';
-			break;
-
-			case 'mssql':
-			case 'mssql_odbc':
-				$this->sql_layer = 'mssql';
-			break;
-
-			case 'mssqlnative':
-				$this->sql_layer = 'mssqlnative';
-			break;
-
-			default:
-				$this->sql_layer = $this->db->get_sql_layer();
-			break;
-		}
-	}
-
-	/**
-	* Setter for {@link $return_statements return_statements}.
-	*
-	* @param bool $return_statements True if SQL should not be executed but returned as strings
-	* @return null
-	*/
-	public function set_return_statements($return_statements)
-	{
-		$this->return_statements = $return_statements;
-	}
-
-	/**
-	* Gets a list of tables in the database.
-	*
-	* @return array		Array of table names  (all lower case)
-	*/
-	function sql_list_tables()
-	{
-		switch ($this->db->get_sql_layer())
-		{
-			case 'mysql':
-			case 'mysql4':
-			case 'mysqli':
-				$sql = 'SHOW TABLES';
-			break;
-
-			case 'sqlite':
-				$sql = 'SELECT name
-					FROM sqlite_master
-					WHERE type = "table"';
-			break;
-
-			case 'sqlite3':
-				$sql = 'SELECT name
-					FROM sqlite_master
-					WHERE type = "table"
-						AND name <> "sqlite_sequence"';
-			break;
-
-			case 'mssql':
-			case 'mssql_odbc':
-			case 'mssqlnative':
-				$sql = "SELECT name
-					FROM sysobjects
-					WHERE type='U'";
-			break;
-
-			case 'postgres':
-				$sql = 'SELECT relname
-					FROM pg_stat_user_tables';
-			break;
-
-			case 'oracle':
-				$sql = 'SELECT table_name
-					FROM USER_TABLES';
-			break;
-		}
-
-		$result = $this->db->sql_query($sql);
-
-		$tables = array();
-		while ($row = $this->db->sql_fetchrow($result))
-		{
-			$name = current($row);
-			$tables[$name] = $name;
-		}
-		$this->db->sql_freeresult($result);
-
-		return $tables;
-	}
-
-	/**
-	* Check if table exists
-	*
-	*
-	* @param string	$table_name	The table name to check for
-	* @return bool true if table exists, else false
-	*/
-	function sql_table_exists($table_name)
-	{
-		$this->db->sql_return_on_error(true);
-		$result = $this->db->sql_query_limit('SELECT * FROM ' . $table_name, 1);
-		$this->db->sql_return_on_error(false);
-
-		if ($result)
-		{
-			$this->db->sql_freeresult($result);
-			return true;
-		}
-
-		return false;
-	}
-
-	/**
-	* Create SQL Table
-	*
-	* @param string	$table_name	The table name to create
-	* @param array	$table_data	Array containing table data.
-	* @return array	Statements if $return_statements is true.
-	*/
-	function sql_create_table($table_name, $table_data)
-	{
-		// holds the DDL for a column
-		$columns = $statements = array();
-
-		if ($this->sql_table_exists($table_name))
-		{
-			return $this->_sql_run_sql($statements);
-		}
-
-		// Begin transaction
-		$statements[] = 'begin';
-
-		// Determine if we have created a PRIMARY KEY in the earliest
-		$primary_key_gen = false;
-
-		// Determine if the table requires a sequence
-		$create_sequence = false;
-
-		// Begin table sql statement
-		switch ($this->sql_layer)
-		{
-			case 'mssql':
-			case 'mssqlnative':
-				$table_sql = 'CREATE TABLE [' . $table_name . '] (' . "\n";
-			break;
-
-			default:
-				$table_sql = 'CREATE TABLE ' . $table_name . ' (' . "\n";
-			break;
-		}
-
-		if ($this->sql_layer == 'mssql' || $this->sql_layer == 'mssqlnative')
-		{
-			if (!isset($table_data['PRIMARY_KEY']))
-			{
-				$table_data['COLUMNS']['mssqlindex'] = array('UINT', null, 'auto_increment');
-				$table_data['PRIMARY_KEY'] = 'mssqlindex';
-			}
-		}
-
-		// Iterate through the columns to create a table
-		foreach ($table_data['COLUMNS'] as $column_name => $column_data)
-		{
-			// here lies an array, filled with information compiled on the column's data
-			$prepared_column = $this->sql_prepare_column_data($table_name, $column_name, $column_data);
-
-			if (isset($prepared_column['auto_increment']) && $prepared_column['auto_increment'] && strlen($column_name) > 26) // "${column_name}_gen"
-			{
-				trigger_error("Index name '${column_name}_gen' on table '$table_name' is too long. The maximum auto increment column length is 26 characters.", E_USER_ERROR);
-			}
-
-			// here we add the definition of the new column to the list of columns
-			switch ($this->sql_layer)
-			{
-				case 'mssql':
-				case 'mssqlnative':
-					$columns[] = "\t [{$column_name}] " . $prepared_column['column_type_sql_default'];
-				break;
-
-				default:
-					$columns[] = "\t {$column_name} " . $prepared_column['column_type_sql'];
-				break;
-			}
-
-			// see if we have found a primary key set due to a column definition if we have found it, we can stop looking
-			if (!$primary_key_gen)
-			{
-				$primary_key_gen = isset($prepared_column['primary_key_set']) && $prepared_column['primary_key_set'];
-			}
-
-			// create sequence DDL based off of the existance of auto incrementing columns
-			if (!$create_sequence && isset($prepared_column['auto_increment']) && $prepared_column['auto_increment'])
-			{
-				$create_sequence = $column_name;
-			}
-		}
-
-		// this makes up all the columns in the create table statement
-		$table_sql .= implode(",\n", $columns);
-
-		// Close the table for two DBMS and add to the statements
-		switch ($this->sql_layer)
-		{
-			case 'mssql':
-			case 'mssqlnative':
-				$table_sql .= "\n);";
-				$statements[] = $table_sql;
-			break;
-		}
-
-		// we have yet to create a primary key for this table,
-		// this means that we can add the one we really wanted instead
-		if (!$primary_key_gen)
-		{
-			// Write primary key
-			if (isset($table_data['PRIMARY_KEY']))
-			{
-				if (!is_array($table_data['PRIMARY_KEY']))
-				{
-					$table_data['PRIMARY_KEY'] = array($table_data['PRIMARY_KEY']);
-				}
-
-				switch ($this->sql_layer)
-				{
-					case 'mysql_40':
-					case 'mysql_41':
-					case 'postgres':
-					case 'sqlite':
-					case 'sqlite3':
-						$table_sql .= ",\n\t PRIMARY KEY (" . implode(', ', $table_data['PRIMARY_KEY']) . ')';
-					break;
-
-					case 'mssql':
-					case 'mssqlnative':
-						// We need the data here
-						$old_return_statements = $this->return_statements;
-						$this->return_statements = true;
-
-						$primary_key_stmts = $this->sql_create_primary_key($table_name, $table_data['PRIMARY_KEY']);
-						foreach ($primary_key_stmts as $pk_stmt)
-						{
-							$statements[] = $pk_stmt;
-						}
-
-						$this->return_statements = $old_return_statements;
-					break;
-
-					case 'oracle':
-						$table_sql .= ",\n\t CONSTRAINT pk_{$table_name} PRIMARY KEY (" . implode(', ', $table_data['PRIMARY_KEY']) . ')';
-					break;
-				}
-			}
-		}
-
-		// close the table
-		switch ($this->sql_layer)
-		{
-			case 'mysql_41':
-				// make sure the table is in UTF-8 mode
-				$table_sql .= "\n) CHARACTER SET `utf8` COLLATE `utf8_bin`;";
-				$statements[] = $table_sql;
-			break;
-
-			case 'mysql_40':
-			case 'sqlite':
-			case 'sqlite3':
-				$table_sql .= "\n);";
-				$statements[] = $table_sql;
-			break;
-
-			case 'postgres':
-				// do we need to add a sequence for auto incrementing columns?
-				if ($create_sequence)
-				{
-					$statements[] = "CREATE SEQUENCE {$table_name}_seq;";
-				}
-
-				$table_sql .= "\n);";
-				$statements[] = $table_sql;
-			break;
-
-			case 'oracle':
-				$table_sql .= "\n)";
-				$statements[] = $table_sql;
-
-				// do we need to add a sequence and a tigger for auto incrementing columns?
-				if ($create_sequence)
-				{
-					// create the actual sequence
-					$statements[] = "CREATE SEQUENCE {$table_name}_seq";
-
-					// the trigger is the mechanism by which we increment the counter
-					$trigger = "CREATE OR REPLACE TRIGGER t_{$table_name}\n";
-					$trigger .= "BEFORE INSERT ON {$table_name}\n";
-					$trigger .= "FOR EACH ROW WHEN (\n";
-					$trigger .= "\tnew.{$create_sequence} IS NULL OR new.{$create_sequence} = 0\n";
-					$trigger .= ")\n";
-					$trigger .= "BEGIN\n";
-					$trigger .= "\tSELECT {$table_name}_seq.nextval\n";
-					$trigger .= "\tINTO :new.{$create_sequence}\n";
-					$trigger .= "\tFROM dual;\n";
-					$trigger .= "END;";
-
-					$statements[] = $trigger;
-				}
-			break;
-		}
-
-		// Write Keys
-		if (isset($table_data['KEYS']))
-		{
-			foreach ($table_data['KEYS'] as $key_name => $key_data)
-			{
-				if (!is_array($key_data[1]))
-				{
-					$key_data[1] = array($key_data[1]);
-				}
-
-				$old_return_statements = $this->return_statements;
-				$this->return_statements = true;
-
-				$key_stmts = ($key_data[0] == 'UNIQUE') ? $this->sql_create_unique_index($table_name, $key_name, $key_data[1]) : $this->sql_create_index($table_name, $key_name, $key_data[1]);
-
-				foreach ($key_stmts as $key_stmt)
-				{
-					$statements[] = $key_stmt;
-				}
-
-				$this->return_statements = $old_return_statements;
-			}
-		}
-
-		// Commit Transaction
-		$statements[] = 'commit';
-
-		return $this->_sql_run_sql($statements);
-	}
-
-	/**
-	* Handle passed database update array.
-	* Expected structure...
-	* Key being one of the following
-	*	drop_tables: Drop tables
-	*	add_tables: Add tables
-	*	change_columns: Column changes (only type, not name)
-	*	add_columns: Add columns to a table
-	*	drop_keys: Dropping keys
-	*	drop_columns: Removing/Dropping columns
-	*	add_primary_keys: adding primary keys
-	*	add_unique_index: adding an unique index
-	*	add_index: adding an index (can be column:index_size if you need to provide size)
-	*
-	* The values are in this format:
-	*		{TABLE NAME}		=> array(
-	*			{COLUMN NAME}		=> array({COLUMN TYPE}, {DEFAULT VALUE}, {OPTIONAL VARIABLES}),
-	*			{KEY/INDEX NAME}	=> array({COLUMN NAMES}),
-	*		)
-	*
-	* For more information have a look at /develop/create_schema_files.php (only available through SVN)
-	*/
-	function perform_schema_changes($schema_changes)
-	{
-		if (empty($schema_changes))
-		{
-			return;
-		}
-
-		$statements = array();
-		$sqlite = false;
-
-		// For SQLite we need to perform the schema changes in a much more different way
-		if (($this->db->get_sql_layer() == 'sqlite' || $this->db->get_sql_layer() == 'sqlite3') && $this->return_statements)
-		{
-			$sqlite_data = array();
-			$sqlite = true;
-		}
-
-		// Drop tables?
-		if (!empty($schema_changes['drop_tables']))
-		{
-			foreach ($schema_changes['drop_tables'] as $table)
-			{
-				// only drop table if it exists
-				if ($this->sql_table_exists($table))
-				{
-					$result = $this->sql_table_drop($table);
-					if ($this->return_statements)
-					{
-						$statements = array_merge($statements, $result);
-					}
-				}
-			}
-		}
-
-		// Add tables?
-		if (!empty($schema_changes['add_tables']))
-		{
-			foreach ($schema_changes['add_tables'] as $table => $table_data)
-			{
-				$result = $this->sql_create_table($table, $table_data);
-				if ($this->return_statements)
-				{
-					$statements = array_merge($statements, $result);
-				}
-			}
-		}
-
-		// Change columns?
-		if (!empty($schema_changes['change_columns']))
-		{
-			foreach ($schema_changes['change_columns'] as $table => $columns)
-			{
-				foreach ($columns as $column_name => $column_data)
-				{
-					// If the column exists we change it, else we add it ;)
-					if ($column_exists = $this->sql_column_exists($table, $column_name))
-					{
-						$result = $this->sql_column_change($table, $column_name, $column_data, true);
-					}
-					else
-					{
-						$result = $this->sql_column_add($table, $column_name, $column_data, true);
-					}
-
-					if ($sqlite)
-					{
-						if ($column_exists)
-						{
-							$sqlite_data[$table]['change_columns'][] = $result;
-						}
-						else
-						{
-							$sqlite_data[$table]['add_columns'][] = $result;
-						}
-					}
-					else if ($this->return_statements)
-					{
-						$statements = array_merge($statements, $result);
-					}
-				}
-			}
-		}
-
-		// Add columns?
-		if (!empty($schema_changes['add_columns']))
-		{
-			foreach ($schema_changes['add_columns'] as $table => $columns)
-			{
-				foreach ($columns as $column_name => $column_data)
-				{
-					// Only add the column if it does not exist yet
-					if ($column_exists = $this->sql_column_exists($table, $column_name))
-					{
-						continue;
-						// This is commented out here because it can take tremendous time on updates
-//						$result = $this->sql_column_change($table, $column_name, $column_data, true);
-					}
-					else
-					{
-						$result = $this->sql_column_add($table, $column_name, $column_data, true);
-					}
-
-					if ($sqlite)
-					{
-						if ($column_exists)
-						{
-							continue;
-//							$sqlite_data[$table]['change_columns'][] = $result;
-						}
-						else
-						{
-							$sqlite_data[$table]['add_columns'][] = $result;
-						}
-					}
-					else if ($this->return_statements)
-					{
-						$statements = array_merge($statements, $result);
-					}
-				}
-			}
-		}
-
-		// Remove keys?
-		if (!empty($schema_changes['drop_keys']))
-		{
-			foreach ($schema_changes['drop_keys'] as $table => $indexes)
-			{
-				foreach ($indexes as $index_name)
-				{
-					if (!$this->sql_index_exists($table, $index_name))
-					{
-						continue;
-					}
-
-					$result = $this->sql_index_drop($table, $index_name);
-
-					if ($this->return_statements)
-					{
-						$statements = array_merge($statements, $result);
-					}
-				}
-			}
-		}
-
-		// Drop columns?
-		if (!empty($schema_changes['drop_columns']))
-		{
-			foreach ($schema_changes['drop_columns'] as $table => $columns)
-			{
-				foreach ($columns as $column)
-				{
-					// Only remove the column if it exists...
-					if ($this->sql_column_exists($table, $column))
-					{
-						$result = $this->sql_column_remove($table, $column, true);
-
-						if ($sqlite)
-						{
-							$sqlite_data[$table]['drop_columns'][] = $result;
-						}
-						else if ($this->return_statements)
-						{
-							$statements = array_merge($statements, $result);
-						}
-					}
-				}
-			}
-		}
-
-		// Add primary keys?
-		if (!empty($schema_changes['add_primary_keys']))
-		{
-			foreach ($schema_changes['add_primary_keys'] as $table => $columns)
-			{
-				$result = $this->sql_create_primary_key($table, $columns, true);
-
-				if ($sqlite)
-				{
-					$sqlite_data[$table]['primary_key'] = $result;
-				}
-				else if ($this->return_statements)
-				{
-					$statements = array_merge($statements, $result);
-				}
-			}
-		}
-
-		// Add unique indexes?
-		if (!empty($schema_changes['add_unique_index']))
-		{
-			foreach ($schema_changes['add_unique_index'] as $table => $index_array)
-			{
-				foreach ($index_array as $index_name => $column)
-				{
-					if ($this->sql_unique_index_exists($table, $index_name))
-					{
-						continue;
-					}
-
-					$result = $this->sql_create_unique_index($table, $index_name, $column);
-
-					if ($this->return_statements)
-					{
-						$statements = array_merge($statements, $result);
-					}
-				}
-			}
-		}
-
-		// Add indexes?
-		if (!empty($schema_changes['add_index']))
-		{
-			foreach ($schema_changes['add_index'] as $table => $index_array)
-			{
-				foreach ($index_array as $index_name => $column)
-				{
-					if ($this->sql_index_exists($table, $index_name))
-					{
-						continue;
-					}
-
-					$result = $this->sql_create_index($table, $index_name, $column);
-
-					if ($this->return_statements)
-					{
-						$statements = array_merge($statements, $result);
-					}
-				}
-			}
-		}
-
-		if ($sqlite)
-		{
-			foreach ($sqlite_data as $table_name => $sql_schema_changes)
-			{
-				// Create temporary table with original data
-				$statements[] = 'begin';
-
-				$sql = "SELECT sql
-					FROM sqlite_master
-					WHERE type = 'table'
-						AND name = '{$table_name}'
-					ORDER BY type DESC, name;";
-				$result = $this->db->sql_query($sql);
-
-				if (!$result)
-				{
-					continue;
-				}
-
-				$row = $this->db->sql_fetchrow($result);
-				$this->db->sql_freeresult($result);
-
-				// Create a backup table and populate it, destroy the existing one
-				$statements[] = preg_replace('#CREATE\s+TABLE\s+"?' . $table_name . '"?#i', 'CREATE TEMPORARY TABLE ' . $table_name . '_temp', $row['sql']);
-				$statements[] = 'INSERT INTO ' . $table_name . '_temp SELECT * FROM ' . $table_name;
-				$statements[] = 'DROP TABLE ' . $table_name;
-
-				// Get the columns...
-				preg_match('#\((.*)\)#s', $row['sql'], $matches);
-
-				$plain_table_cols = trim($matches[1]);
-				$new_table_cols = preg_split('/,(?![\s\w]+\))/m', $plain_table_cols);
-				$column_list = array();
-
-				foreach ($new_table_cols as $declaration)
-				{
-					$entities = preg_split('#\s+#', trim($declaration));
-					if ($entities[0] == 'PRIMARY')
-					{
-						continue;
-					}
-					$column_list[] = $entities[0];
-				}
-
-				// note down the primary key notation because sqlite only supports adding it to the end for the new table
-				$primary_key = false;
-				$_new_cols = array();
-
-				foreach ($new_table_cols as $key => $declaration)
-				{
-					$entities = preg_split('#\s+#', trim($declaration));
-					if ($entities[0] == 'PRIMARY')
-					{
-						$primary_key = $declaration;
-						continue;
-					}
-					$_new_cols[] = $declaration;
-				}
-
-				$new_table_cols = $_new_cols;
-
-				// First of all... change columns
-				if (!empty($sql_schema_changes['change_columns']))
-				{
-					foreach ($sql_schema_changes['change_columns'] as $column_sql)
-					{
-						foreach ($new_table_cols as $key => $declaration)
-						{
-							$entities = preg_split('#\s+#', trim($declaration));
-							if (strpos($column_sql, $entities[0] . ' ') === 0)
-							{
-								$new_table_cols[$key] = $column_sql;
-							}
-						}
-					}
-				}
-
-				if (!empty($sql_schema_changes['add_columns']))
-				{
-					foreach ($sql_schema_changes['add_columns'] as $column_sql)
-					{
-						$new_table_cols[] = $column_sql;
-					}
-				}
-
-				// Now drop them...
-				if (!empty($sql_schema_changes['drop_columns']))
-				{
-					foreach ($sql_schema_changes['drop_columns'] as $column_name)
-					{
-						// Remove from column list...
-						$new_column_list = array();
-						foreach ($column_list as $key => $value)
-						{
-							if ($value === $column_name)
-							{
-								continue;
-							}
-
-							$new_column_list[] = $value;
-						}
-
-						$column_list = $new_column_list;
-
-						// Remove from table...
-						$_new_cols = array();
-						foreach ($new_table_cols as $key => $declaration)
-						{
-							$entities = preg_split('#\s+#', trim($declaration));
-							if (strpos($column_name . ' ', $entities[0] . ' ') === 0)
-							{
-								continue;
-							}
-							$_new_cols[] = $declaration;
-						}
-						$new_table_cols = $_new_cols;
-					}
-				}
-
-				// Primary key...
-				if (!empty($sql_schema_changes['primary_key']))
-				{
-					$new_table_cols[] = 'PRIMARY KEY (' . implode(', ', $sql_schema_changes['primary_key']) . ')';
-				}
-				// Add a new one or the old primary key
-				else if ($primary_key !== false)
-				{
-					$new_table_cols[] = $primary_key;
-				}
-
-				$columns = implode(',', $column_list);
-
-				// create a new table and fill it up. destroy the temp one
-				$statements[] = 'CREATE TABLE ' . $table_name . ' (' . implode(',', $new_table_cols) . ');';
-				$statements[] = 'INSERT INTO ' . $table_name . ' (' . $columns . ') SELECT ' . $columns . ' FROM ' . $table_name . '_temp;';
-				$statements[] = 'DROP TABLE ' . $table_name . '_temp';
-
-				$statements[] = 'commit';
-			}
-		}
-
-		if ($this->return_statements)
-		{
-			return $statements;
-		}
-	}
-
-	/**
-	* Gets a list of columns of a table.
-	*
-	* @param string $table		Table name
-	*
-	* @return array				Array of column names (all lower case)
-	*/
-	function sql_list_columns($table)
-	{
-		$columns = array();
-
-		switch ($this->sql_layer)
-		{
-			case 'mysql_40':
-			case 'mysql_41':
-				$sql = "SHOW COLUMNS FROM $table";
-			break;
-
-			// PostgreSQL has a way of doing this in a much simpler way but would
-			// not allow us to support all versions of PostgreSQL
-			case 'postgres':
-				$sql = "SELECT a.attname
-					FROM pg_class c, pg_attribute a
-					WHERE c.relname = '{$table}'
-						AND a.attnum > 0
-						AND a.attrelid = c.oid";
-			break;
-
-			// same deal with PostgreSQL, we must perform more complex operations than
-			// we technically could
-			case 'mssql':
-			case 'mssqlnative':
-				$sql = "SELECT c.name
-					FROM syscolumns c
-					LEFT JOIN sysobjects o ON c.id = o.id
-					WHERE o.name = '{$table}'";
-			break;
-
-			case 'oracle':
-				$sql = "SELECT column_name
-					FROM user_tab_columns
-					WHERE LOWER(table_name) = '" . strtolower($table) . "'";
-			break;
-
-			case 'sqlite':
-			case 'sqlite3':
-				$sql = "SELECT sql
-					FROM sqlite_master
-					WHERE type = 'table'
-						AND name = '{$table}'";
-
-				$result = $this->db->sql_query($sql);
-
-				if (!$result)
-				{
-					return false;
-				}
-
-				$row = $this->db->sql_fetchrow($result);
-				$this->db->sql_freeresult($result);
-
-				preg_match('#\((.*)\)#s', $row['sql'], $matches);
-
-				$cols = trim($matches[1]);
-				$col_array = preg_split('/,(?![\s\w]+\))/m', $cols);
-
-				foreach ($col_array as $declaration)
-				{
-					$entities = preg_split('#\s+#', trim($declaration));
-					if ($entities[0] == 'PRIMARY')
-					{
-						continue;
-					}
-
-					$column = strtolower($entities[0]);
-					$columns[$column] = $column;
-				}
-
-				return $columns;
-			break;
-		}
-
-		$result = $this->db->sql_query($sql);
-
-		while ($row = $this->db->sql_fetchrow($result))
-		{
-			$column = strtolower(current($row));
-			$columns[$column] = $column;
-		}
-		$this->db->sql_freeresult($result);
-
-		return $columns;
-	}
-
-	/**
-	* Check whether a specified column exist in a table
-	*
-	* @param string	$table			Table to check
-	* @param string	$column_name	Column to check
-	*
-	* @return bool		True if column exists, false otherwise
-	*/
-	function sql_column_exists($table, $column_name)
-	{
-		$columns = $this->sql_list_columns($table);
-
-		return isset($columns[$column_name]);
-	}
-
-	/**
-	* Check if a specified index exists in table. Does not return PRIMARY KEY and UNIQUE indexes.
-	*
-	* @param string	$table_name		Table to check the index at
-	* @param string	$index_name		The index name to check
-	*
-	* @return bool True if index exists, else false
-	*/
-	function sql_index_exists($table_name, $index_name)
-	{
-		if ($this->sql_layer == 'mssql' || $this->sql_layer == 'mssqlnative')
-		{
-			$sql = "EXEC sp_statistics '$table_name'";
-			$result = $this->db->sql_query($sql);
-
-			while ($row = $this->db->sql_fetchrow($result))
-			{
-				if ($row['TYPE'] == 3)
-				{
-					if (strtolower($row['INDEX_NAME']) == strtolower($index_name))
-					{
-						$this->db->sql_freeresult($result);
-						return true;
-					}
-				}
-			}
-			$this->db->sql_freeresult($result);
-
-			return false;
-		}
-
-		switch ($this->sql_layer)
-		{
-			case 'postgres':
-				$sql = "SELECT ic.relname as index_name
-					FROM pg_class bc, pg_class ic, pg_index i
-					WHERE (bc.oid = i.indrelid)
-						AND (ic.oid = i.indexrelid)
-						AND (bc.relname = '" . $table_name . "')
-						AND (i.indisunique != 't')
-						AND (i.indisprimary != 't')";
-				$col = 'index_name';
-			break;
-
-			case 'mysql_40':
-			case 'mysql_41':
-				$sql = 'SHOW KEYS
-					FROM ' . $table_name;
-				$col = 'Key_name';
-			break;
-
-			case 'oracle':
-				$sql = "SELECT index_name
-					FROM user_indexes
-					WHERE table_name = '" . strtoupper($table_name) . "'
-						AND generated = 'N'
-						AND uniqueness = 'NONUNIQUE'";
-				$col = 'index_name';
-			break;
-
-			case 'sqlite':
-			case 'sqlite3':
-				$sql = "PRAGMA index_list('" . $table_name . "');";
-				$col = 'name';
-			break;
-		}
-
-		$result = $this->db->sql_query($sql);
-		while ($row = $this->db->sql_fetchrow($result))
-		{
-			if (($this->sql_layer == 'mysql_40' || $this->sql_layer == 'mysql_41') && !$row['Non_unique'])
-			{
-				continue;
-			}
-
-			// These DBMS prefix index name with the table name
-			switch ($this->sql_layer)
-			{
-				case 'oracle':
-				case 'postgres':
-				case 'sqlite':
-				case 'sqlite3':
-					$row[$col] = substr($row[$col], strlen($table_name) + 1);
-				break;
-			}
-
-			if (strtolower($row[$col]) == strtolower($index_name))
-			{
-				$this->db->sql_freeresult($result);
-				return true;
-			}
-		}
-		$this->db->sql_freeresult($result);
-
-		return false;
-	}
-
-	/**
-	* Check if a specified index exists in table. Does not return PRIMARY KEY indexes.
-	*
-	* @param string	$table_name		Table to check the index at
-	* @param string	$index_name		The index name to check
-	*
-	* @return bool True if index exists, else false
-	*/
-	function sql_unique_index_exists($table_name, $index_name)
-	{
-		if ($this->sql_layer == 'mssql' || $this->sql_layer == 'mssqlnative')
-		{
-			$sql = "EXEC sp_statistics '$table_name'";
-			$result = $this->db->sql_query($sql);
-
-			while ($row = $this->db->sql_fetchrow($result))
-			{
-				// Usually NON_UNIQUE is the column we want to check, but we allow for both
-				if ($row['TYPE'] == 3)
-				{
-					if (strtolower($row['INDEX_NAME']) == strtolower($index_name))
-					{
-						$this->db->sql_freeresult($result);
-						return true;
-					}
-				}
-			}
-			$this->db->sql_freeresult($result);
-			return false;
-		}
-
-		switch ($this->sql_layer)
-		{
-			case 'postgres':
-				$sql = "SELECT ic.relname as index_name, i.indisunique
-					FROM pg_class bc, pg_class ic, pg_index i
-					WHERE (bc.oid = i.indrelid)
-						AND (ic.oid = i.indexrelid)
-						AND (bc.relname = '" . $table_name . "')
-						AND (i.indisprimary != 't')";
-				$col = 'index_name';
-			break;
-
-			case 'mysql_40':
-			case 'mysql_41':
-				$sql = 'SHOW KEYS
-					FROM ' . $table_name;
-				$col = 'Key_name';
-			break;
-
-			case 'oracle':
-				$sql = "SELECT index_name, table_owner
-					FROM user_indexes
-					WHERE table_name = '" . strtoupper($table_name) . "'
-						AND generated = 'N'
-						AND uniqueness = 'UNIQUE'";
-				$col = 'index_name';
-			break;
-
-			case 'sqlite':
-			case 'sqlite3':
-				$sql = "PRAGMA index_list('" . $table_name . "');";
-				$col = 'name';
-			break;
-		}
-
-		$result = $this->db->sql_query($sql);
-		while ($row = $this->db->sql_fetchrow($result))
-		{
-			if (($this->sql_layer == 'mysql_40' || $this->sql_layer == 'mysql_41') && ($row['Non_unique'] || $row[$col] == 'PRIMARY'))
-			{
-				continue;
-			}
-
-			if (($this->sql_layer == 'sqlite' || $this->sql_layer == 'sqlite3') && !$row['unique'])
-			{
-				continue;
-			}
-
-			if ($this->sql_layer == 'postgres' && $row['indisunique'] != 't')
-			{
-				continue;
-			}
-
-			// These DBMS prefix index name with the table name
-			switch ($this->sql_layer)
-			{
-				case 'oracle':
-					// Two cases here... prefixed with U_[table_owner] and not prefixed with table_name
-					if (strpos($row[$col], 'U_') === 0)
-					{
-						$row[$col] = substr($row[$col], strlen('U_' . $row['table_owner']) + 1);
-					}
-					else if (strpos($row[$col], strtoupper($table_name)) === 0)
-					{
-						$row[$col] = substr($row[$col], strlen($table_name) + 1);
-					}
-				break;
-
-				case 'postgres':
-				case 'sqlite':
-				case 'sqlite3':
-					$row[$col] = substr($row[$col], strlen($table_name) + 1);
-				break;
-			}
-
-			if (strtolower($row[$col]) == strtolower($index_name))
-			{
-				$this->db->sql_freeresult($result);
-				return true;
-			}
-		}
-		$this->db->sql_freeresult($result);
-
-		return false;
-	}
-
-	/**
-	* Private method for performing sql statements (either execute them or return them)
-	* @access private
-	*/
-	function _sql_run_sql($statements)
-	{
-		if ($this->return_statements)
-		{
-			return $statements;
-		}
-
-		// We could add error handling here...
-		foreach ($statements as $sql)
-		{
-			if ($sql === 'begin')
-			{
-				$this->db->sql_transaction('begin');
-			}
-			else if ($sql === 'commit')
-			{
-				$this->db->sql_transaction('commit');
-			}
-			else
-			{
-				$this->db->sql_query($sql);
-			}
-		}
-
-		return true;
-	}
-
-	/**
-	* Function to prepare some column information for better usage
-	* @access private
-	*/
-	function sql_prepare_column_data($table_name, $column_name, $column_data)
-	{
-		if (strlen($column_name) > 30)
-		{
-			trigger_error("Column name '$column_name' on table '$table_name' is too long. The maximum is 30 characters.", E_USER_ERROR);
-		}
-
-		// Get type
-		list($column_type, $orig_column_type) = $this->get_column_type($column_data[0]);
-
-		// Adjust default value if db-dependent specified
-		if (is_array($column_data[1]))
-		{
-			$column_data[1] = (isset($column_data[1][$this->sql_layer])) ? $column_data[1][$this->sql_layer] : $column_data[1]['default'];
-		}
-
-		$sql = '';
-
-		$return_array = array();
-
-		switch ($this->sql_layer)
-		{
-			case 'mssql':
-			case 'mssqlnative':
-				$sql .= " {$column_type} ";
-				$sql_default = " {$column_type} ";
-
-				// For adding columns we need the default definition
-				if (!is_null($column_data[1]))
-				{
-					// For hexadecimal values do not use single quotes
-					if (strpos($column_data[1], '0x') === 0)
-					{
-						$return_array['default'] = 'DEFAULT (' . $column_data[1] . ') ';
-						$sql_default .= $return_array['default'];
-					}
-					else
-					{
-						$return_array['default'] = 'DEFAULT (' . ((is_numeric($column_data[1])) ? $column_data[1] : "'{$column_data[1]}'") . ') ';
-						$sql_default .= $return_array['default'];
-					}
-				}
-
-				if (isset($column_data[2]) && $column_data[2] == 'auto_increment')
-				{
-//					$sql .= 'IDENTITY (1, 1) ';
-					$sql_default .= 'IDENTITY (1, 1) ';
-				}
-
-				$return_array['textimage'] = $column_type === '[text]';
-
-				if (!is_null($column_data[1]) || (isset($column_data[2]) && $column_data[2] == 'auto_increment'))
-				{
-					$sql .= 'NOT NULL';
-					$sql_default .= 'NOT NULL';
-				}
-				else
-				{
-					$sql .= 'NULL';
-					$sql_default .= 'NULL';
-				}
-
-				$return_array['column_type_sql_default'] = $sql_default;
-
-			break;
-
-			case 'mysql_40':
-			case 'mysql_41':
-				$sql .= " {$column_type} ";
-
-				// For hexadecimal values do not use single quotes
-				if (!is_null($column_data[1]) && substr($column_type, -4) !== 'text' && substr($column_type, -4) !== 'blob')
-				{
-					$sql .= (strpos($column_data[1], '0x') === 0) ? "DEFAULT {$column_data[1]} " : "DEFAULT '{$column_data[1]}' ";
-				}
-
-				if (!is_null($column_data[1]) || (isset($column_data[2]) && $column_data[2] == 'auto_increment'))
-				{
-					$sql .= 'NOT NULL';
-				}
-				else
-				{
-					$sql .= 'NULL';
-				}
-
-				if (isset($column_data[2]))
-				{
-					if ($column_data[2] == 'auto_increment')
-					{
-						$sql .= ' auto_increment';
-					}
-					else if ($this->sql_layer === 'mysql_41' && $column_data[2] == 'true_sort')
-					{
-						$sql .= ' COLLATE utf8_unicode_ci';
-					}
-				}
-
-				if (isset($column_data['after']))
-				{
-					$return_array['after'] = $column_data['after'];
-				}
-
-			break;
-
-			case 'oracle':
-				$sql .= " {$column_type} ";
-				$sql .= (!is_null($column_data[1])) ? "DEFAULT '{$column_data[1]}' " : '';
-
-				// In Oracle empty strings ('') are treated as NULL.
-				// Therefore in oracle we allow NULL's for all DEFAULT '' entries
-				// Oracle does not like setting NOT NULL on a column that is already NOT NULL (this happens only on number fields)
-				if (!preg_match('/number/i', $column_type))
-				{
-					$sql .= ($column_data[1] === '' || $column_data[1] === null) ? '' : 'NOT NULL';
-				}
-
-				$return_array['auto_increment'] = false;
-				if (isset($column_data[2]) && $column_data[2] == 'auto_increment')
-				{
-					$return_array['auto_increment'] = true;
-				}
-
-			break;
-
-			case 'postgres':
-				$return_array['column_type'] = $column_type;
-
-				$sql .= " {$column_type} ";
-
-				$return_array['auto_increment'] = false;
-				if (isset($column_data[2]) && $column_data[2] == 'auto_increment')
-				{
-					$default_val = "nextval('{$table_name}_seq')";
-					$return_array['auto_increment'] = true;
-				}
-				else if (!is_null($column_data[1]))
-				{
-					$default_val = "'" . $column_data[1] . "'";
-					$return_array['null'] = 'NOT NULL';
-					$sql .= 'NOT NULL ';
-				}
-				else
-				{
-					// Integers need to have 0 instead of empty string as default
-					if (strpos($column_type, 'INT') === 0)
-					{
-						$default_val = '0';
-					}
-					else
-					{
-						$default_val = "'" . $column_data[1] . "'";
-					}
-					$return_array['null'] = 'NULL';
-					$sql .= 'NULL ';
-				}
-
-				$return_array['default'] = $default_val;
-
-				$sql .= "DEFAULT {$default_val}";
-
-				// Unsigned? Then add a CHECK contraint
-				if (in_array($orig_column_type, $this->unsigned_types))
-				{
-					$return_array['constraint'] = "CHECK ({$column_name} >= 0)";
-					$sql .= " CHECK ({$column_name} >= 0)";
-				}
-
-			break;
-
-			case 'sqlite':
-			case 'sqlite3':
-				$return_array['primary_key_set'] = false;
-				if (isset($column_data[2]) && $column_data[2] == 'auto_increment')
-				{
-					$sql .= ' INTEGER PRIMARY KEY';
-					$return_array['primary_key_set'] = true;
-
-					if ($this->sql_layer === 'sqlite3')
-					{
-						$sql .= ' AUTOINCREMENT';
-					}
-				}
-				else
-				{
-					$sql .= ' ' . $column_type;
-				}
-
-				if (!is_null($column_data[1]))
-				{
-					$sql .= ' NOT NULL ';
-					$sql .= "DEFAULT '{$column_data[1]}'";
-				}
-
-			break;
-		}
-
-		$return_array['column_type_sql'] = $sql;
-
-		return $return_array;
-	}
-
-	/**
-	* Get the column's database type from the type map
-	*
-	* @param string $column_map_type
-	* @return array		column type for this database
-	*					and map type without length
-	*/
-	function get_column_type($column_map_type)
-	{
-		if (strpos($column_map_type, ':') !== false)
-		{
-			list($orig_column_type, $column_length) = explode(':', $column_map_type);
-			if (!is_array($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']))
-			{
-				$column_type = sprintf($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':'], $column_length);
-			}
-			else
-			{
-				if (isset($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['rule']))
-				{
-					switch ($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['rule'][0])
-					{
-						case 'div':
-							$column_length /= $this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['rule'][1];
-							$column_length = ceil($column_length);
-							$column_type = sprintf($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':'][0], $column_length);
-						break;
-					}
-				}
-
-				if (isset($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['limit']))
-				{
-					switch ($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['limit'][0])
-					{
-						case 'mult':
-							$column_length *= $this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['limit'][1];
-							if ($column_length > $this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['limit'][2])
-							{
-								$column_type = $this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['limit'][3];
-							}
-							else
-							{
-								$column_type = sprintf($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':'][0], $column_length);
-							}
-						break;
-					}
-				}
-			}
-			$orig_column_type .= ':';
-		}
-		else
-		{
-			$orig_column_type = $column_map_type;
-			$column_type = $this->dbms_type_map[$this->sql_layer][$column_map_type];
-		}
-
-		return array($column_type, $orig_column_type);
-	}
-
-	/**
-	* Add new column
-	*/
-	function sql_column_add($table_name, $column_name, $column_data, $inline = false)
-	{
-		$column_data = $this->sql_prepare_column_data($table_name, $column_name, $column_data);
-		$statements = array();
-
-		switch ($this->sql_layer)
-		{
-			case 'mssql':
-			case 'mssqlnative':
-				// Does not support AFTER, only through temporary table
-				$statements[] = 'ALTER TABLE [' . $table_name . '] ADD [' . $column_name . '] ' . $column_data['column_type_sql_default'];
-			break;
-
-			case 'mysql_40':
-			case 'mysql_41':
-				$after = (!empty($column_data['after'])) ? ' AFTER ' . $column_data['after'] : '';
-				$statements[] = 'ALTER TABLE `' . $table_name . '` ADD COLUMN `' . $column_name . '` ' . $column_data['column_type_sql'] . $after;
-			break;
-
-			case 'oracle':
-				// Does not support AFTER, only through temporary table
-				$statements[] = 'ALTER TABLE ' . $table_name . ' ADD ' . $column_name . ' ' . $column_data['column_type_sql'];
-			break;
-
-			case 'postgres':
-				// Does not support AFTER, only through temporary table
-				if (version_compare($this->db->sql_server_info(true), '8.0', '>='))
-				{
-					$statements[] = 'ALTER TABLE ' . $table_name . ' ADD COLUMN "' . $column_name . '" ' . $column_data['column_type_sql'];
-				}
-				else
-				{
-					// old versions cannot add columns with default and null information
-					$statements[] = 'ALTER TABLE ' . $table_name . ' ADD COLUMN "' . $column_name . '" ' . $column_data['column_type'] . ' ' . $column_data['constraint'];
-
-					if (isset($column_data['null']))
-					{
-						if ($column_data['null'] == 'NOT NULL')
-						{
-							$statements[] = 'ALTER TABLE ' . $table_name . ' ALTER COLUMN ' . $column_name . ' SET NOT NULL';
-						}
-					}
-
-					if (isset($column_data['default']))
-					{
-						$statements[] = 'ALTER TABLE ' . $table_name . ' ALTER COLUMN ' . $column_name . ' SET DEFAULT ' . $column_data['default'];
-					}
-				}
-
-			break;
-
-			case 'sqlite':
-				if ($inline && $this->return_statements)
-				{
-					return $column_name . ' ' . $column_data['column_type_sql'];
-				}
-
-				$recreate_queries = $this->sqlite_get_recreate_table_queries($table_name);
-				if (empty($recreate_queries))
-				{
-					break;
-				}
-
-				$statements[] = 'begin';
-
-				$sql_create_table = array_shift($recreate_queries);
-
-				// Create a backup table and populate it, destroy the existing one
-				$statements[] = preg_replace('#CREATE\s+TABLE\s+"?' . $table_name . '"?#i', 'CREATE TEMPORARY TABLE ' . $table_name . '_temp', $sql_create_table);
-				$statements[] = 'INSERT INTO ' . $table_name . '_temp SELECT * FROM ' . $table_name;
-				$statements[] = 'DROP TABLE ' . $table_name;
-
-				preg_match('#\((.*)\)#s', $sql_create_table, $matches);
-
-				$new_table_cols = trim($matches[1]);
-				$old_table_cols = preg_split('/,(?![\s\w]+\))/m', $new_table_cols);
-				$column_list = array();
-
-				foreach ($old_table_cols as $declaration)
-				{
-					$entities = preg_split('#\s+#', trim($declaration));
-					if ($entities[0] == 'PRIMARY')
-					{
-						continue;
-					}
-					$column_list[] = $entities[0];
-				}
-
-				$columns = implode(',', $column_list);
-
-				$new_table_cols = $column_name . ' ' . $column_data['column_type_sql'] . ',' . $new_table_cols;
-
-				// create a new table and fill it up. destroy the temp one
-				$statements[] = 'CREATE TABLE ' . $table_name . ' (' . $new_table_cols . ');';
-				$statements = array_merge($statements, $recreate_queries);
-
-				$statements[] = 'INSERT INTO ' . $table_name . ' (' . $columns . ') SELECT ' . $columns . ' FROM ' . $table_name . '_temp;';
-				$statements[] = 'DROP TABLE ' . $table_name . '_temp';
-
-				$statements[] = 'commit';
-			break;
-
-			case 'sqlite3':
-				if ($inline && $this->return_statements)
-				{
-					return $column_name . ' ' . $column_data['column_type_sql'];
-				}
-
-				$statements[] = 'ALTER TABLE ' . $table_name . ' ADD ' . $column_name . ' ' . $column_data['column_type_sql'];
-			break;
-		}
-
-		return $this->_sql_run_sql($statements);
-	}
-
-	/**
-	* Drop column
-	*/
-	function sql_column_remove($table_name, $column_name, $inline = false)
-	{
-		$statements = array();
-
-		switch ($this->sql_layer)
-		{
-			case 'mssql':
-			case 'mssqlnative':
-				// We need the data here
-				$old_return_statements = $this->return_statements;
-				$this->return_statements = true;
-
-				$indexes = $this->get_existing_indexes($table_name, $column_name);
-				$indexes = array_merge($indexes, $this->get_existing_indexes($table_name, $column_name, true));
-
-				// Drop any indexes
-				$recreate_indexes = array();
-				if (!empty($indexes))
-				{
-					foreach ($indexes as $index_name => $index_data)
-					{
-						$result = $this->sql_index_drop($table_name, $index_name);
-						$statements = array_merge($statements, $result);
-						if (sizeof($index_data) > 1)
-						{
-							// Remove this column from the index and recreate it
-							$recreate_indexes[$index_name] = array_diff($index_data, array($column_name));
-						}
-					}
-				}
-
-				// Drop default value constraint
-				$result = $this->mssql_get_drop_default_constraints_queries($table_name, $column_name);
-				$statements = array_merge($statements, $result);
-
-				// Remove the column
-				$statements[] = 'ALTER TABLE [' . $table_name . '] DROP COLUMN [' . $column_name . ']';
-
-				if (!empty($recreate_indexes))
-				{
-					// Recreate indexes after we removed the column
-					foreach ($recreate_indexes as $index_name => $index_data)
-					{
-						$result = $this->sql_create_index($table_name, $index_name, $index_data);
-						$statements = array_merge($statements, $result);
-					}
-				}
-
-				$this->return_statements = $old_return_statements;
-			break;
-
-			case 'mysql_40':
-			case 'mysql_41':
-				$statements[] = 'ALTER TABLE `' . $table_name . '` DROP COLUMN `' . $column_name . '`';
-			break;
-
-			case 'oracle':
-				$statements[] = 'ALTER TABLE ' . $table_name . ' DROP COLUMN ' . $column_name;
-			break;
-
-			case 'postgres':
-				$statements[] = 'ALTER TABLE ' . $table_name . ' DROP COLUMN "' . $column_name . '"';
-			break;
-
-			case 'sqlite':
-			case 'sqlite3':
-
-				if ($inline && $this->return_statements)
-				{
-					return $column_name;
-				}
-
-				$recreate_queries = $this->sqlite_get_recreate_table_queries($table_name, $column_name);
-				if (empty($recreate_queries))
-				{
-					break;
-				}
-
-				$statements[] = 'begin';
-
-				$sql_create_table = array_shift($recreate_queries);
-
-				// Create a backup table and populate it, destroy the existing one
-				$statements[] = preg_replace('#CREATE\s+TABLE\s+"?' . $table_name . '"?#i', 'CREATE TEMPORARY TABLE ' . $table_name . '_temp', $sql_create_table);
-				$statements[] = 'INSERT INTO ' . $table_name . '_temp SELECT * FROM ' . $table_name;
-				$statements[] = 'DROP TABLE ' . $table_name;
-
-				preg_match('#\((.*)\)#s', $sql_create_table, $matches);
-
-				$new_table_cols = trim($matches[1]);
-				$old_table_cols = preg_split('/,(?![\s\w]+\))/m', $new_table_cols);
-				$column_list = array();
-
-				foreach ($old_table_cols as $declaration)
-				{
-					$entities = preg_split('#\s+#', trim($declaration));
-					if ($entities[0] == 'PRIMARY' || $entities[0] === $column_name)
-					{
-						continue;
-					}
-					$column_list[] = $entities[0];
-				}
-
-				$columns = implode(',', $column_list);
-
-				$new_table_cols = trim(preg_replace('/' . $column_name . '\b[^,]+(?:,|$)/m', '', $new_table_cols));
-				if (substr($new_table_cols, -1) === ',')
-				{
-					// Remove the comma from the last entry again
-					$new_table_cols = substr($new_table_cols, 0, -1);
-				}
-
-				// create a new table and fill it up. destroy the temp one
-				$statements[] = 'CREATE TABLE ' . $table_name . ' (' . $new_table_cols . ');';
-				$statements = array_merge($statements, $recreate_queries);
-
-				$statements[] = 'INSERT INTO ' . $table_name . ' (' . $columns . ') SELECT ' . $columns . ' FROM ' . $table_name . '_temp;';
-				$statements[] = 'DROP TABLE ' . $table_name . '_temp';
-
-				$statements[] = 'commit';
-			break;
-		}
-
-		return $this->_sql_run_sql($statements);
-	}
-
-	/**
-	* Drop Index
-	*/
-	function sql_index_drop($table_name, $index_name)
-	{
-		$statements = array();
-
-		switch ($this->sql_layer)
-		{
-			case 'mssql':
-			case 'mssqlnative':
-				$statements[] = 'DROP INDEX ' . $table_name . '.' . $index_name;
-			break;
-
-			case 'mysql_40':
-			case 'mysql_41':
-				$statements[] = 'DROP INDEX ' . $index_name . ' ON ' . $table_name;
-			break;
-
-			case 'oracle':
-			case 'postgres':
-			case 'sqlite':
-			case 'sqlite3':
-				$statements[] = 'DROP INDEX ' . $table_name . '_' . $index_name;
-			break;
-		}
-
-		return $this->_sql_run_sql($statements);
-	}
-
-	/**
-	* Drop Table
-	*/
-	function sql_table_drop($table_name)
-	{
-		$statements = array();
-
-		if (!$this->sql_table_exists($table_name))
-		{
-			return $this->_sql_run_sql($statements);
-		}
-
-		// the most basic operation, get rid of the table
-		$statements[] = 'DROP TABLE ' . $table_name;
-
-		switch ($this->sql_layer)
-		{
-			case 'oracle':
-				$sql = 'SELECT A.REFERENCED_NAME
-					FROM USER_DEPENDENCIES A, USER_TRIGGERS B
-					WHERE A.REFERENCED_TYPE = \'SEQUENCE\'
-						AND A.NAME = B.TRIGGER_NAME
-						AND B.TABLE_NAME = \'' . strtoupper($table_name) . "'";
-				$result = $this->db->sql_query($sql);
-
-				// any sequences ref'd to this table's triggers?
-				while ($row = $this->db->sql_fetchrow($result))
-				{
-					$statements[] = "DROP SEQUENCE {$row['referenced_name']}";
-				}
-				$this->db->sql_freeresult($result);
-			break;
-
-			case 'postgres':
-				// PGSQL does not "tightly" bind sequences and tables, we must guess...
-				$sql = "SELECT relname
-					FROM pg_class
-					WHERE relkind = 'S'
-						AND relname = '{$table_name}_seq'";
-				$result = $this->db->sql_query($sql);
-
-				// We don't even care about storing the results. We already know the answer if we get rows back.
-				if ($this->db->sql_fetchrow($result))
-				{
-					$statements[] =  "DROP SEQUENCE {$table_name}_seq;\n";
-				}
-				$this->db->sql_freeresult($result);
-			break;
-		}
-
-		return $this->_sql_run_sql($statements);
-	}
-
-	/**
-	* Add primary key
-	*/
-	function sql_create_primary_key($table_name, $column, $inline = false)
-	{
-		$statements = array();
-
-		switch ($this->sql_layer)
-		{
-			case 'postgres':
-			case 'mysql_40':
-			case 'mysql_41':
-				$statements[] = 'ALTER TABLE ' . $table_name . ' ADD PRIMARY KEY (' . implode(', ', $column) . ')';
-			break;
-
-			case 'mssql':
-			case 'mssqlnative':
-				$sql = "ALTER TABLE [{$table_name}] WITH NOCHECK ADD ";
-				$sql .= "CONSTRAINT [PK_{$table_name}] PRIMARY KEY  CLUSTERED (";
-				$sql .= '[' . implode("],\n\t\t[", $column) . ']';
-				$sql .= ')';
-
-				$statements[] = $sql;
-			break;
-
-			case 'oracle':
-				$statements[] = 'ALTER TABLE ' . $table_name . ' add CONSTRAINT pk_' . $table_name . ' PRIMARY KEY (' . implode(', ', $column) . ')';
-			break;
-
-			case 'sqlite':
-			case 'sqlite3':
-
-				if ($inline && $this->return_statements)
-				{
-					return $column;
-				}
-
-				$recreate_queries = $this->sqlite_get_recreate_table_queries($table_name);
-				if (empty($recreate_queries))
-				{
-					break;
-				}
-
-				$statements[] = 'begin';
-
-				$sql_create_table = array_shift($recreate_queries);
-
-				// Create a backup table and populate it, destroy the existing one
-				$statements[] = preg_replace('#CREATE\s+TABLE\s+"?' . $table_name . '"?#i', 'CREATE TEMPORARY TABLE ' . $table_name . '_temp', $sql_create_table);
-				$statements[] = 'INSERT INTO ' . $table_name . '_temp SELECT * FROM ' . $table_name;
-				$statements[] = 'DROP TABLE ' . $table_name;
-
-				preg_match('#\((.*)\)#s', $sql_create_table, $matches);
-
-				$new_table_cols = trim($matches[1]);
-				$old_table_cols = preg_split('/,(?![\s\w]+\))/m', $new_table_cols);
-				$column_list = array();
-
-				foreach ($old_table_cols as $declaration)
-				{
-					$entities = preg_split('#\s+#', trim($declaration));
-					if ($entities[0] == 'PRIMARY')
-					{
-						continue;
-					}
-					$column_list[] = $entities[0];
-				}
-
-				$columns = implode(',', $column_list);
-
-				// create a new table and fill it up. destroy the temp one
-				$statements[] = 'CREATE TABLE ' . $table_name . ' (' . $new_table_cols . ', PRIMARY KEY (' . implode(', ', $column) . '));';
-				$statements = array_merge($statements, $recreate_queries);
-
-				$statements[] = 'INSERT INTO ' . $table_name . ' (' . $columns . ') SELECT ' . $columns . ' FROM ' . $table_name . '_temp;';
-				$statements[] = 'DROP TABLE ' . $table_name . '_temp';
-
-				$statements[] = 'commit';
-			break;
-		}
-
-		return $this->_sql_run_sql($statements);
-	}
-
-	/**
-	* Add unique index
-	*/
-	function sql_create_unique_index($table_name, $index_name, $column)
-	{
-		$statements = array();
-
-		$table_prefix = substr(CONFIG_TABLE, 0, -6); // strlen(config)
-		if (strlen($table_name . '_' . $index_name) - strlen($table_prefix) > 24)
-		{
-			$max_length = strlen($table_prefix) + 24;
-			trigger_error("Index name '{$table_name}_$index_name' on table '$table_name' is too long. The maximum is $max_length characters.", E_USER_ERROR);
-		}
-
-		switch ($this->sql_layer)
-		{
-			case 'postgres':
-			case 'oracle':
-			case 'sqlite':
-			case 'sqlite3':
-				$statements[] = 'CREATE UNIQUE INDEX ' . $table_name . '_' . $index_name . ' ON ' . $table_name . '(' . implode(', ', $column) . ')';
-			break;
-
-			case 'mysql_40':
-			case 'mysql_41':
-				$statements[] = 'ALTER TABLE ' . $table_name . ' ADD UNIQUE INDEX ' . $index_name . '(' . implode(', ', $column) . ')';
-			break;
-
-			case 'mssql':
-			case 'mssqlnative':
-				$statements[] = 'CREATE UNIQUE INDEX [' . $index_name . '] ON [' . $table_name . ']([' . implode('], [', $column) . '])';
-			break;
-		}
-
-		return $this->_sql_run_sql($statements);
-	}
-
-	/**
-	* Add index
-	*/
-	function sql_create_index($table_name, $index_name, $column)
-	{
-		$statements = array();
-
-		$table_prefix = substr(CONFIG_TABLE, 0, -6); // strlen(config)
-		if (strlen($table_name . $index_name) - strlen($table_prefix) > 24)
-		{
-			$max_length = strlen($table_prefix) + 24;
-			trigger_error("Index name '{$table_name}_$index_name' on table '$table_name' is too long. The maximum is $max_length characters.", E_USER_ERROR);
-		}
-
-		// remove index length unless MySQL4
-		if ('mysql_40' != $this->sql_layer)
-		{
-			$column = preg_replace('#:.*$#', '', $column);
-		}
-
-		switch ($this->sql_layer)
-		{
-			case 'postgres':
-			case 'oracle':
-			case 'sqlite':
-			case 'sqlite3':
-				$statements[] = 'CREATE INDEX ' . $table_name . '_' . $index_name . ' ON ' . $table_name . '(' . implode(', ', $column) . ')';
-			break;
-
-			case 'mysql_40':
-				// add index size to definition as required by MySQL4
-				foreach ($column as $i => $col)
-				{
-					if (false !== strpos($col, ':'))
-					{
-						list($col, $index_size) = explode(':', $col);
-						$column[$i] = "$col($index_size)";
-					}
-				}
-			// no break
-			case 'mysql_41':
-				$statements[] = 'ALTER TABLE ' . $table_name . ' ADD INDEX ' . $index_name . ' (' . implode(', ', $column) . ')';
-			break;
-
-			case 'mssql':
-			case 'mssqlnative':
-				$statements[] = 'CREATE INDEX [' . $index_name . '] ON [' . $table_name . ']([' . implode('], [', $column) . '])';
-			break;
-		}
-
-		return $this->_sql_run_sql($statements);
-	}
-
-	/**
-	* List all of the indices that belong to a table,
-	* does not count:
-	* * UNIQUE indices
-	* * PRIMARY keys
-	*/
-	function sql_list_index($table_name)
-	{
-		$index_array = array();
-
-		if ($this->sql_layer == 'mssql' || $this->sql_layer == 'mssqlnative')
-		{
-			$sql = "EXEC sp_statistics '$table_name'";
-			$result = $this->db->sql_query($sql);
-			while ($row = $this->db->sql_fetchrow($result))
-			{
-				if ($row['TYPE'] == 3)
-				{
-					$index_array[] = $row['INDEX_NAME'];
-				}
-			}
-			$this->db->sql_freeresult($result);
-		}
-		else
-		{
-			switch ($this->sql_layer)
-			{
-				case 'postgres':
-					$sql = "SELECT ic.relname as index_name
-						FROM pg_class bc, pg_class ic, pg_index i
-						WHERE (bc.oid = i.indrelid)
-							AND (ic.oid = i.indexrelid)
-							AND (bc.relname = '" . $table_name . "')
-							AND (i.indisunique != 't')
-							AND (i.indisprimary != 't')";
-					$col = 'index_name';
-				break;
-
-				case 'mysql_40':
-				case 'mysql_41':
-					$sql = 'SHOW KEYS
-						FROM ' . $table_name;
-					$col = 'Key_name';
-				break;
-
-				case 'oracle':
-					$sql = "SELECT index_name
-						FROM user_indexes
-						WHERE table_name = '" . strtoupper($table_name) . "'
-							AND generated = 'N'
-							AND uniqueness = 'NONUNIQUE'";
-					$col = 'index_name';
-				break;
-
-				case 'sqlite':
-				case 'sqlite3':
-					$sql = "PRAGMA index_info('" . $table_name . "');";
-					$col = 'name';
-				break;
-			}
-
-			$result = $this->db->sql_query($sql);
-			while ($row = $this->db->sql_fetchrow($result))
-			{
-				if (($this->sql_layer == 'mysql_40' || $this->sql_layer == 'mysql_41') && !$row['Non_unique'])
-				{
-					continue;
-				}
-
-				switch ($this->sql_layer)
-				{
-					case 'oracle':
-					case 'postgres':
-					case 'sqlite':
-					case 'sqlite3':
-						$row[$col] = substr($row[$col], strlen($table_name) + 1);
-					break;
-				}
-
-				$index_array[] = $row[$col];
-			}
-			$this->db->sql_freeresult($result);
-		}
-
-		return array_map('strtolower', $index_array);
-	}
-
-	/**
-	 * Removes table_name from the index_name if it is at the beginning
-	 *
-	 * @param $table_name
-	 * @param $index_name
-	 * @return string
-	 */
-	protected function strip_table_name_from_index_name($table_name, $index_name)
-	{
-		return (strpos(strtoupper($index_name), strtoupper($table_name)) === 0) ? substr($index_name, strlen($table_name) + 1) : $index_name;
-	}
-
-	/**
-	* Change column type (not name!)
-	*/
-	function sql_column_change($table_name, $column_name, $column_data, $inline = false)
-	{
-		$original_column_data = $column_data;
-		$column_data = $this->sql_prepare_column_data($table_name, $column_name, $column_data);
-		$statements = array();
-
-		switch ($this->sql_layer)
-		{
-			case 'mssql':
-			case 'mssqlnative':
-				// We need the data here
-				$old_return_statements = $this->return_statements;
-				$this->return_statements = true;
-
-				$indexes = $this->get_existing_indexes($table_name, $column_name);
-				$unique_indexes = $this->get_existing_indexes($table_name, $column_name, true);
-
-				// Drop any indexes
-				if (!empty($indexes) || !empty($unique_indexes))
-				{
-					$drop_indexes = array_merge(array_keys($indexes), array_keys($unique_indexes));
-					foreach ($drop_indexes as $index_name)
-					{
-						$result = $this->sql_index_drop($table_name, $index_name);
-						$statements = array_merge($statements, $result);
-					}
-				}
-
-				// Drop default value constraint
-				$result = $this->mssql_get_drop_default_constraints_queries($table_name, $column_name);
-				$statements = array_merge($statements, $result);
-
-				// Change the column
-				$statements[] = 'ALTER TABLE [' . $table_name . '] ALTER COLUMN [' . $column_name . '] ' . $column_data['column_type_sql'];
-
-				if (!empty($column_data['default']))
-				{
-					// Add new default value constraint
-					$statements[] = 'ALTER TABLE [' . $table_name . '] ADD CONSTRAINT [DF_' . $table_name . '_' . $column_name . '_1] ' . $column_data['default'] . ' FOR [' . $column_name . ']';
-				}
-
-				if (!empty($indexes))
-				{
-					// Recreate indexes after we changed the column
-					foreach ($indexes as $index_name => $index_data)
-					{
-						$result = $this->sql_create_index($table_name, $index_name, $index_data);
-						$statements = array_merge($statements, $result);
-					}
-				}
-
-				if (!empty($unique_indexes))
-				{
-					// Recreate unique indexes after we changed the column
-					foreach ($unique_indexes as $index_name => $index_data)
-					{
-						$result = $this->sql_create_unique_index($table_name, $index_name, $index_data);
-						$statements = array_merge($statements, $result);
-					}
-				}
-
-				$this->return_statements = $old_return_statements;
-			break;
-
-			case 'mysql_40':
-			case 'mysql_41':
-				$statements[] = 'ALTER TABLE `' . $table_name . '` CHANGE `' . $column_name . '` `' . $column_name . '` ' . $column_data['column_type_sql'];
-			break;
-
-			case 'oracle':
-				// We need the data here
-				$old_return_statements = $this->return_statements;
-				$this->return_statements = true;
-
-				// Get list of existing indexes
-				$indexes = $this->get_existing_indexes($table_name, $column_name);
-				$unique_indexes = $this->get_existing_indexes($table_name, $column_name, true);
-
-				// Drop any indexes
-				if (!empty($indexes) || !empty($unique_indexes))
-				{
-					$drop_indexes = array_merge(array_keys($indexes), array_keys($unique_indexes));
-					foreach ($drop_indexes as $index_name)
-					{
-						$result = $this->sql_index_drop($table_name, $this->strip_table_name_from_index_name($table_name, $index_name));
-						$statements = array_merge($statements, $result);
-					}
-				}
-
-				$temp_column_name = 'temp_' . substr(md5($column_name), 0, 25);
-				// Add a temporary table with the new type
-				$result = $this->sql_column_add($table_name, $temp_column_name, $original_column_data);
-				$statements = array_merge($statements, $result);
-
-				// Copy the data to the new column
-				$statements[] = 'UPDATE ' . $table_name . ' SET ' . $temp_column_name . ' = ' . $column_name;
-
-				// Drop the original column
-				$result = $this->sql_column_remove($table_name, $column_name);
-				$statements = array_merge($statements, $result);
-
-				// Recreate the original column with the new type
-				$result = $this->sql_column_add($table_name, $column_name, $original_column_data);
-				$statements = array_merge($statements, $result);
-
-				if (!empty($indexes))
-				{
-					// Recreate indexes after we changed the column
-					foreach ($indexes as $index_name => $index_data)
-					{
-						$result = $this->sql_create_index($table_name, $this->strip_table_name_from_index_name($table_name, $index_name), $index_data);
-						$statements = array_merge($statements, $result);
-					}
-				}
-
-				if (!empty($unique_indexes))
-				{
-					// Recreate unique indexes after we changed the column
-					foreach ($unique_indexes as $index_name => $index_data)
-					{
-						$result = $this->sql_create_unique_index($table_name, $this->strip_table_name_from_index_name($table_name, $index_name), $index_data);
-						$statements = array_merge($statements, $result);
-					}
-				}
-
-				// Copy the data to the original column
-				$statements[] = 'UPDATE ' . $table_name . ' SET ' . $column_name . ' = ' . $temp_column_name;
-
-				// Drop the temporary column again
-				$result = $this->sql_column_remove($table_name, $temp_column_name);
-				$statements = array_merge($statements, $result);
-
-				$this->return_statements = $old_return_statements;
-			break;
-
-			case 'postgres':
-				$sql = 'ALTER TABLE ' . $table_name . ' ';
-
-				$sql_array = array();
-				$sql_array[] = 'ALTER COLUMN ' . $column_name . ' TYPE ' . $column_data['column_type'];
-
-				if (isset($column_data['null']))
-				{
-					if ($column_data['null'] == 'NOT NULL')
-					{
-						$sql_array[] = 'ALTER COLUMN ' . $column_name . ' SET NOT NULL';
-					}
-					else if ($column_data['null'] == 'NULL')
-					{
-						$sql_array[] = 'ALTER COLUMN ' . $column_name . ' DROP NOT NULL';
-					}
-				}
-
-				if (isset($column_data['default']))
-				{
-					$sql_array[] = 'ALTER COLUMN ' . $column_name . ' SET DEFAULT ' . $column_data['default'];
-				}
-
-				// we don't want to double up on constraints if we change different number data types
-				if (isset($column_data['constraint']))
-				{
-					$constraint_sql = "SELECT consrc as constraint_data
-								FROM pg_constraint, pg_class bc
-								WHERE conrelid = bc.oid
-									AND bc.relname = '{$table_name}'
-									AND NOT EXISTS (
-										SELECT *
-											FROM pg_constraint as c, pg_inherits as i
-											WHERE i.inhrelid = pg_constraint.conrelid
-												AND c.conname = pg_constraint.conname
-												AND c.consrc = pg_constraint.consrc
-												AND c.conrelid = i.inhparent
-									)";
-
-					$constraint_exists = false;
-
-					$result = $this->db->sql_query($constraint_sql);
-					while ($row = $this->db->sql_fetchrow($result))
-					{
-						if (trim($row['constraint_data']) == trim($column_data['constraint']))
-						{
-							$constraint_exists = true;
-							break;
-						}
-					}
-					$this->db->sql_freeresult($result);
-
-					if (!$constraint_exists)
-					{
-						$sql_array[] = 'ADD ' . $column_data['constraint'];
-					}
-				}
-
-				$sql .= implode(', ', $sql_array);
-
-				$statements[] = $sql;
-			break;
-
-			case 'sqlite':
-			case 'sqlite3':
-
-				if ($inline && $this->return_statements)
-				{
-					return $column_name . ' ' . $column_data['column_type_sql'];
-				}
-
-				$recreate_queries = $this->sqlite_get_recreate_table_queries($table_name);
-				if (empty($recreate_queries))
-				{
-					break;
-				}
-
-				$statements[] = 'begin';
-
-				$sql_create_table = array_shift($recreate_queries);
-
-				// Create a temp table and populate it, destroy the existing one
-				$statements[] = preg_replace('#CREATE\s+TABLE\s+"?' . $table_name . '"?#i', 'CREATE TEMPORARY TABLE ' . $table_name . '_temp', $sql_create_table);
-				$statements[] = 'INSERT INTO ' . $table_name . '_temp SELECT * FROM ' . $table_name;
-				$statements[] = 'DROP TABLE ' . $table_name;
-
-				preg_match('#\((.*)\)#s', $sql_create_table, $matches);
-
-				$new_table_cols = trim($matches[1]);
-				$old_table_cols = preg_split('/,(?![\s\w]+\))/m', $new_table_cols);
-				$column_list = array();
-
-				foreach ($old_table_cols as $key => $declaration)
-				{
-					$declaration = trim($declaration);
-
-					// Check for the beginning of the constraint section and stop
-					if (preg_match('/[^\(]*\s*PRIMARY KEY\s+\(/', $declaration) ||
-						preg_match('/[^\(]*\s*UNIQUE\s+\(/', $declaration) ||
-						preg_match('/[^\(]*\s*FOREIGN KEY\s+\(/', $declaration) ||
-						preg_match('/[^\(]*\s*CHECK\s+\(/', $declaration))
-					{
-						break;
-					}
-
-					$entities = preg_split('#\s+#', $declaration);
-					$column_list[] = $entities[0];
-					if ($entities[0] == $column_name)
-					{
-						$old_table_cols[$key] = $column_name . ' ' . $column_data['column_type_sql'];
-					}
-				}
-
-				$columns = implode(',', $column_list);
-
-				// Create a new table and fill it up. destroy the temp one
-				$statements[] = 'CREATE TABLE ' . $table_name . ' (' . implode(',', $old_table_cols) . ');';
-				$statements = array_merge($statements, $recreate_queries);
-
-				$statements[] = 'INSERT INTO ' . $table_name . ' (' . $columns . ') SELECT ' . $columns . ' FROM ' . $table_name . '_temp;';
-				$statements[] = 'DROP TABLE ' . $table_name . '_temp';
-
-				$statements[] = 'commit';
-
-			break;
-		}
-
-		return $this->_sql_run_sql($statements);
-	}
-
-	/**
-	* Get queries to drop the default constraints of a column
-	*
-	* We need to drop the default constraints of a column,
-	* before being able to change their type or deleting them.
-	*
-	* @param string $table_name
-	* @param string $column_name
-	* @return array		Array with SQL statements
-	*/
-	protected function mssql_get_drop_default_constraints_queries($table_name, $column_name)
-	{
-		$statements = array();
-		if ($this->mssql_is_sql_server_2000())
-		{
-			// http://msdn.microsoft.com/en-us/library/aa175912%28v=sql.80%29.aspx
-			// Deprecated in SQL Server 2005
-			$sql = "SELECT so.name AS def_name
-				FROM sysobjects so
-				JOIN sysconstraints sc ON so.id = sc.constid
-				WHERE object_name(so.parent_obj) = '{$table_name}'
-					AND so.xtype = 'D'
-					AND sc.colid = (SELECT colid FROM syscolumns
-						WHERE id = object_id('{$table_name}')
-							AND name = '{$column_name}')";
-		}
-		else
-		{
-			$sql = "SELECT dobj.name AS def_name
-				FROM sys.columns col
-					LEFT OUTER JOIN sys.objects dobj ON (dobj.object_id = col.default_object_id AND dobj.type = 'D')
-				WHERE col.object_id = object_id('{$table_name}')
-					AND col.name = '{$column_name}'
-					AND dobj.name IS NOT NULL";
-		}
-
-		$result = $this->db->sql_query($sql);
-		while ($row = $this->db->sql_fetchrow($result))
-		{
-			$statements[] = 'ALTER TABLE [' . $table_name . '] DROP CONSTRAINT [' . $row['def_name'] . ']';
-		}
-		$this->db->sql_freeresult($result);
-
-		return $statements;
-	}
-
-	/**
-	* Get a list with existing indexes for the column
-	*
-	* @param string $table_name
-	* @param string $column_name
-	* @param bool $unique Should we get unique indexes or normal ones
-	* @return array		Array with Index name => columns
-	*/
-	public function get_existing_indexes($table_name, $column_name, $unique = false)
-	{
-		switch ($this->sql_layer)
-		{
-			case 'mysql_40':
-			case 'mysql_41':
-			case 'postgres':
-			case 'sqlite':
-			case 'sqlite3':
-				// Not supported
-				throw new \Exception('DBMS is not supported');
-			break;
-		}
-
-		$sql = '';
-		$existing_indexes = array();
-
-		switch ($this->sql_layer)
-		{
-			case 'mssql':
-			case 'mssqlnative':
-				if ($this->mssql_is_sql_server_2000())
-				{
-					// http://msdn.microsoft.com/en-us/library/aa175912%28v=sql.80%29.aspx
-					// Deprecated in SQL Server 2005
-					$sql = "SELECT DISTINCT ix.name AS phpbb_index_name
-					FROM sysindexes ix
-					INNER JOIN sysindexkeys ixc
-						ON ixc.id = ix.id
-							AND ixc.indid = ix.indid
-					INNER JOIN syscolumns cols
-						ON cols.colid = ixc.colid
-							AND cols.id = ix.id
-					WHERE ix.id = object_id('{$table_name}')
-						AND cols.name = '{$column_name}'
-						AND INDEXPROPERTY(ix.id, ix.name, 'IsUnique') = " . ($unique ? '1' : '0');
-				}
-				else
-				{
-					$sql = "SELECT DISTINCT ix.name AS phpbb_index_name
-					FROM sys.indexes ix
-					INNER JOIN sys.index_columns ixc
-						ON ixc.object_id = ix.object_id
-							AND ixc.index_id = ix.index_id
-					INNER JOIN sys.columns cols
-						ON cols.column_id = ixc.column_id
-							AND cols.object_id = ix.object_id
-					WHERE ix.object_id = object_id('{$table_name}')
-						AND cols.name = '{$column_name}'
-						AND ix.is_unique = " . ($unique ? '1' : '0');
-				}
-			break;
-
-			case 'oracle':
-				$sql = "SELECT ix.index_name  AS phpbb_index_name, ix.uniqueness AS is_unique
-					FROM all_ind_columns ixc, all_indexes ix
-					WHERE ix.index_name = ixc.index_name
-						AND ixc.table_name = '" . strtoupper($table_name) . "'
-						AND ixc.column_name = '" . strtoupper($column_name) . "'";
-			break;
-		}
-
-		$result = $this->db->sql_query($sql);
-		while ($row = $this->db->sql_fetchrow($result))
-		{
-			if (!isset($row['is_unique']) || ($unique && $row['is_unique'] == 'UNIQUE') || (!$unique && $row['is_unique'] == 'NONUNIQUE'))
-			{
-				$existing_indexes[$row['phpbb_index_name']] = array();
-			}
-		}
-		$this->db->sql_freeresult($result);
-
-		if (empty($existing_indexes))
-		{
-			return array();
-		}
-
-		switch ($this->sql_layer)
-		{
-			case 'mssql':
-			case 'mssqlnative':
-				if ($this->mssql_is_sql_server_2000())
-				{
-					$sql = "SELECT DISTINCT ix.name AS phpbb_index_name, cols.name AS phpbb_column_name
-						FROM sysindexes ix
-						INNER JOIN sysindexkeys ixc
-							ON ixc.id = ix.id
-								AND ixc.indid = ix.indid
-						INNER JOIN syscolumns cols
-							ON cols.colid = ixc.colid
-								AND cols.id = ix.id
-						WHERE ix.id = object_id('{$table_name}')
-							AND " . $this->db->sql_in_set('ix.name', array_keys($existing_indexes));
-				}
-				else
-				{
-					$sql = "SELECT DISTINCT ix.name AS phpbb_index_name, cols.name AS phpbb_column_name
-						FROM sys.indexes ix
-						INNER JOIN sys.index_columns ixc
-							ON ixc.object_id = ix.object_id
-								AND ixc.index_id = ix.index_id
-						INNER JOIN sys.columns cols
-							ON cols.column_id = ixc.column_id
-								AND cols.object_id = ix.object_id
-						WHERE ix.object_id = object_id('{$table_name}')
-							AND " . $this->db->sql_in_set('ix.name', array_keys($existing_indexes));
-				}
-			break;
-
-			case 'oracle':
-				$sql = "SELECT index_name AS phpbb_index_name, column_name AS phpbb_column_name
-					FROM all_ind_columns
-					WHERE table_name = '" . strtoupper($table_name) . "'
-						AND " . $this->db->sql_in_set('index_name', array_keys($existing_indexes));
-			break;
-		}
-
-		$result = $this->db->sql_query($sql);
-		while ($row = $this->db->sql_fetchrow($result))
-		{
-			$existing_indexes[$row['phpbb_index_name']][] = $row['phpbb_column_name'];
-		}
-		$this->db->sql_freeresult($result);
-
-		return $existing_indexes;
-	}
-
-	/**
-	* Is the used MS SQL Server a SQL Server 2000?
-	*
-	* @return bool
-	*/
-	protected function mssql_is_sql_server_2000()
-	{
-		if ($this->is_sql_server_2000 === null)
-		{
-			$sql = "SELECT CAST(SERVERPROPERTY('productversion') AS VARCHAR(25)) AS mssql_version";
-			$result = $this->db->sql_query($sql);
-			$properties = $this->db->sql_fetchrow($result);
-			$this->db->sql_freeresult($result);
-			$this->is_sql_server_2000 = $properties['mssql_version'][0] == '8';
-		}
-
-		return $this->is_sql_server_2000;
-	}
-
-	/**
-	* Returns the Queries which are required to recreate a table including indexes
-	*
-	* @param string $table_name
-	* @param string $remove_column	When we drop a column, we remove the column
-	*								from all indexes. If the index has no other
-	*								column, we drop it completly.
-	* @return array
-	*/
-	protected function sqlite_get_recreate_table_queries($table_name, $remove_column = '')
-	{
-		$queries = array();
-
-		$sql = "SELECT sql
-			FROM sqlite_master
-			WHERE type = 'table'
-				AND name = '{$table_name}'";
-		$result = $this->db->sql_query($sql);
-		$sql_create_table = $this->db->sql_fetchfield('sql');
-		$this->db->sql_freeresult($result);
-
-		if (!$sql_create_table)
-		{
-			return array();
-		}
-		$queries[] = $sql_create_table;
-
-		$sql = "SELECT sql
-			FROM sqlite_master
-			WHERE type = 'index'
-				AND tbl_name = '{$table_name}'";
-		$result = $this->db->sql_query($sql);
-		while ($sql_create_index = $this->db->sql_fetchfield('sql'))
-		{
-			if ($remove_column)
-			{
-				$match = array();
-				preg_match('#(?:[\w ]+)\((.*)\)#', $sql_create_index, $match);
-				if (!isset($match[1]))
-				{
-					continue;
-				}
-
-				// Find and remove $remove_column from the index
-				$columns = explode(', ', $match[1]);
-				$found_column = array_search($remove_column, $columns);
-				if ($found_column !== false)
-				{
-					unset($columns[$found_column]);
-
-					// If the column list is not empty add the index to the list
-					if (!empty($columns))
-					{
-						$queries[] = str_replace($match[1], implode(', ', $columns), $sql_create_index);
-					}
-				}
-				else
-				{
-					$queries[] = $sql_create_index;
-				}
-			}
-			else
-			{
-				$queries[] = $sql_create_index;
-			}
-		}
-		$this->db->sql_freeresult($result);
-
-		return $queries;
-	}
 }