/**

*

* @package dbal

* @version $Id: mysql.php 8815 2008-09-04 13:37:01Z acydburn $

* @copyright (c) 2005 phpBB Group

* @license http://opensource.org/licenses/gpl-license.php GNU Public License

*

*/

/**

* @ignore

*/

if (!defined('IN_PHPBB'))

{

	exit;

}

include_once($phpbb_root_path . 'includes/db/dbal.' . $phpEx);

/**

* MySQL4 Database Abstraction Layer

* Compatible with:

* MySQL 3.23+

* MySQL 4.0+

* MySQL 4.1+

* MySQL 5.0+

* @package dbal

*/

class dbal_mysql extends dbal

{

	var $multi_insert = true;

	/**

	* 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';

		$this->db_connect_id = ($this->persistency) ? @mysql_pconnect($this->server, $this->user, $sqlpassword, $new_link) : @mysql_connect($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), '4.1.3', '>='))

				{

					@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

	* @return string sql server version

	*/

	function sql_server_info($raw = false)

	{

		global $cache;

		if (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))

			{

				$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_EXTRA'))

			{

				$this->sql_report('start', $query);

			}

			$this->query_result = ($cache_ttl && method_exists($cache, 'sql_load')) ? $cache->sql_load($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_EXTRA'))

				{

					$this->sql_report('stop', $query);

				}

				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 if (defined('DEBUG_EXTRA'))

			{

				$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)

		{

			// Having a value of -1 was always a bug

			$total = '18446744073709551615';

		}

		$query .= "\n LIMIT " . ((!empty($offset)) ? $offset . ', ' . $total : $total);

		return $this->sql_query($query, $cache_ttl);

	}

	/**

	* Return number of affected rows

	*/

	function sql_affectedrows()

	{

		return ($this->db_connect_id) ? @mysql_affected_rows($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 (isset($cache->sql_rowset[$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 (isset($cache->sql_rowset[$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 (isset($cache->sql_rowset[$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);

	}

	/**

	* 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;

	}

	/**

	* return sql error array

	* @access private

	*/

	function _sql_error()

	{

		if (!$this->db_connect_id)

		{

			return array(

				'message'	=> @mysql_error(),

				'code'		=> @mysql_errno()

			);

		}

		return array(

			'message'	=> @mysql_error($this->db_connect_id),

			'code'		=> @mysql_errno($this->db_connect_id)

		);

	}

	/**

	* 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 .= '';

					}

					if ($test_prof)

					{

						$html_table = false;

						// get the last profile

						if ($result = @mysql_query('SHOW PROFILE ALL;', $this->db_connect_id))

						{

							$this->html_hold .= '
';

							while ($row = @mysql_fetch_assoc($result))

							{

								// make <unknown> HTML safe

								if (!empty($row['Source_function']))

								{

									$row['Source_function'] = str_replace(array('<', '>'), array('<', '>'), $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 .= '';

						}

						@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;

		}

	}

}

?>