<?php
/** 
*
* @package dbal
* @version $Id$
* @copyright (c) 2005 phpBB Group 
* @license http://opensource.org/licenses/gpl-license.php GNU Public License 
*
*/

/**
*/
if (!defined('IN_PHPBB'))
{
	exit;
}

/**
* @ignore
*/
if (!defined('SQL_LAYER'))
{

	define('SQL_LAYER', 'firebird');
	include($phpbb_root_path . 'includes/db/dbal.' . $phpEx);

/**
* @package dbal
* Firebird/Interbase Database Abstraction Layer
* Minimum Requirement is Firebird 1.5+/Interbase 7.1+
*/
class dbal_firebird extends dbal
{
	var $last_query_text = '';

	/**
	* Connect to server
	*/
	function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false)
	{
		$this->persistency = $persistency;
		$this->user = $sqluser;
		$this->server = $sqlserver . (($port) ? ':' . $port : '');
		$this->dbname = $database;

		$this->db_connect_id = ($this->persistency) ? @ibase_pconnect($this->server . ':' . $this->dbname, $this->user, $sqlpassword, false, false, 3) : @ibase_connect($this->server . ':' . $this->dbname, $this->user, $sqlpassword, false, false, 3);

		return ($this->db_connect_id) ? $this->db_connect_id : $this->sql_error('');
	}

	/**
	* sql transaction
	*/
	function sql_transaction($status = 'begin')
	{
		switch ($status)
		{
			case 'begin':
				$this->transaction = true;
				break;

			case 'commit':
				$result = @ibase_commit();
				$this->transaction = false;

				if (!$result)
				{
					@ibase_rollback();
				}
				break;

			case 'rollback':
				$result = @ibase_rollback();
				$this->transaction = false;
				break;

			default:
				$result = true;
		}

		return $result;
	}

	/**
	* Base query method
	*/
	function sql_query($query = '', $cache_ttl = 0)
	{
		if ($query != '')
		{
			global $cache;

			$query = preg_replace('#FROM \(([^)]*)\)(,|[\n\r\t ]+(?:WHERE|LEFT JOIN)) #', 'FROM \1\2 ', $query);

			$this->last_query_text = $query;
			$this->query_result = ($cache_ttl && method_exists($cache, 'sql_load')) ? $cache->sql_load($query) : false;

			if (!$this->query_result)
			{
				$this->num_queries++;

				if (($this->query_result = @ibase_query($this->db_connect_id, $query)) === false)
				{
					$this->sql_error($query);
				}

				// TODO: have to debug the commit states in firebird
				if (!$this->transaction)
				{
					@ibase_commit_ret();
				}

				if ($cache_ttl && method_exists($cache, 'sql_save'))
				{
					$this->open_queries[(int) $this->query_result] = $this->query_result;
					$cache->sql_save($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
		{
			return false;
		}

		return ($this->query_result) ? $this->query_result : false;
	}

	/**
	* Build LIMIT query
	*/
	function sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0) 
	{ 
		if ($query != '') 
		{
			$this->query_result = false; 

			$query = 'SELECT FIRST ' . $total . ((!empty($offset)) ? ' SKIP ' . $offset : '') . substr($query, 6);

			return $this->sql_query($query, $cache_ttl); 
		} 
		else 
		{ 
			return false; 
		} 
	}

	/**
	* Return number of rows
	* Not used within core code
	*/
	function sql_numrows($query_id = false)
	{
		return false;
	}

	/**
	* 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->query_result) ? true : false;
		}
	}

	/**
	* Fetch current row
	*/
	function sql_fetchrow($query_id = false)
	{
		global $cache;

		if (!$query_id)
		{
			$query_id = $this->query_result;
		}

		if (isset($cache->sql_rowset[$query_id]))
		{
			return $cache->sql_fetchrow($query_id);
		}

		$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)] = trim(str_replace("\\0", "\0", str_replace("\\n", "\n", $value)));
		}

		return (sizeof($row)) ? $row : false;
	}

	/**
	* 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, $query_id = false)
	{
		if (!$query_id)
		{
			$query_id = $this->query_result;
		}

		if ($query_id)
		{
			if ($rownum !== false)
			{
				$this->sql_rowseek($rownum, $query_id);
			}
			
			$row = $this->sql_fetchrow($query_id);
			return isset($row[$field]) ? $row[$field] : false;
		}

		return false;
	}

	/**
	* Seek to given row number
	* rownum is zero-based
	*/
	function sql_rowseek($rownum, $query_id = false)
	{
		if (!$query_id)
		{
			$query_id = $this->query_result;
		}

/*
		$this->sql_freeresult($query_id);
		$query_id = $this->sql_query($this->last_query_text);

		if (!$query_id)
		{
			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;
	}

	/**
	* Get last inserted id after insert statement
	*/
	function sql_nextid()
	{
		$query_id = $this->query_result;

		if ($query_id && $this->last_query_text != '')
		{
			if ($this->query_result && preg_match('#^INSERT[\t\n ]+INTO[\t\n ]+([a-z0-9\_\-]+)#is', $this->last_query_text, $tablename))
			{
				$query = "SELECT GEN_ID(" . $tablename[1] . "_gen, 0) AS new_id  
					FROM RDB\$DATABASE";
				if (!($temp_q_id =  @ibase_query($this->db_connect_id, $query)))
				{
					return false;
				}

				$temp_result = @ibase_fetch_object($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($query_id = false)
	{
		if (!$query_id)
		{
			$query_id = $this->query_result;
		}

		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($msg)
	{
		return (@ini_get('magic_quotes_sybase') || strtolower(@ini_get('magic_quotes_sybase')) == 'on') ? str_replace('\\\'', '\'', addslashes($msg)) : str_replace('\'', '\'\'', stripslashes($msg));
	}

	/**
	* return sql error array
	* @private
	*/
	function _sql_error()
	{
		return array(
			'message'	=> @ibase_errmsg(),
			'code'		=> (@function_exists('ibase_errcode') ? @ibase_errcode() : '')
		);
	}

	/**
	* Close sql connection
	* @private
	*/
	function _sql_close()
	{
		return @ibase_close($this->db_connect_id);
	}

	/**
	* Build db-specific report
	* @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($result, IBASE_TEXT))
				{
					// Take the time spent on parsing rows into account
				}
				@ibase_freeresult($result);

				$splittime = explode(' ', microtime());
				$splittime = $splittime[0] + $splittime[1];

				$this->sql_report('record_fromcache', $query, $endtime, $splittime);

			break;
		}
	}

}

} // if ... define

?>