/**

*

* @package dbal

* @version $Id: mssql.php 8967 2008-10-02 12:04:12Z 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);

/**

* MSSQL Database Abstraction Layer

* Minimum Requirement is MSSQL 2000+

* @package dbal

*/

class dbal_mssql extends dbal

{

	/**

	* Connect to server

	*/

	function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false)

	{

		$this->persistency = $persistency;

		$this->user = $sqluser;

		$this->dbname = $database;

		$port_delimiter = (defined('PHP_OS') && substr(PHP_OS, 0, 3) === 'WIN') ? ',' : ':';

		$this->server = $sqlserver . (($port) ? $port_delimiter . $port : '');

		@ini_set('mssql.charset', 'UTF-8');

		@ini_set('mssql.textlimit', 2147483647);

		@ini_set('mssql.textsize', 2147483647);

		if (version_compare(PHP_VERSION, '5.1.0', '>=') || (version_compare(PHP_VERSION, '5.0.0-dev', '<=') && version_compare(PHP_VERSION, '4.4.1', '>=')))

		{

			$this->db_connect_id = ($this->persistency) ? @mssql_pconnect($this->server, $this->user, $sqlpassword, $new_link) : @mssql_connect($this->server, $this->user, $sqlpassword, $new_link);

		}

		else

		{

			$this->db_connect_id = ($this->persistency) ? @mssql_pconnect($this->server, $this->user, $sqlpassword) : @mssql_connect($this->server, $this->user, $sqlpassword);

		}

		if ($this->db_connect_id && $this->dbname != '')

		{

			if (!@mssql_select_db($this->dbname, $this->db_connect_id))

			{

				@mssql_close($this->db_connect_id);

				return false;

			}

		}

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

	}

	/**

	* Version information about used database

	* @param bool $raw if true, only return the fetched sql_server_version

	* @return string sql server version

	*/

	function sql_server_info($raw = false)

	{

		global $cache;

		if (empty($cache) || ($this->sql_server_version = $cache->get('mssql_version')) === false)

		{

			$result_id = @mssql_query("SELECT SERVERPROPERTY('productversion'), SERVERPROPERTY('productlevel'), SERVERPROPERTY('edition')", $this->db_connect_id);

			$row = false;

			if ($result_id)

			{

				$row = @mssql_fetch_assoc($result_id);

				@mssql_free_result($result_id);

			}

			$this->sql_server_version = ($row) ? trim(implode(' ', $row)) : 0;

			if (!empty($cache))

			{

				$cache->put('mssql_version', $this->sql_server_version);

			}

		}

		if ($raw)

		{

			return $this->sql_server_version;

		}

		return ($this->sql_server_version) ? 'MSSQL
' . $this->sql_server_version : 'MSSQL';

	}

	/**

	* SQL Transaction

	* @access private

	*/

	function _sql_transaction($status = 'begin')

	{

		switch ($status)

		{

			case 'begin':

				return @mssql_query('BEGIN TRANSACTION', $this->db_connect_id);

			break;

			case 'commit':

				return @mssql_query('COMMIT TRANSACTION', $this->db_connect_id);

			break;

			case 'rollback':

				return @mssql_query('ROLLBACK TRANSACTION', $this->db_connect_id);

			break;

		}

		return true;

	}

	/**

	* Base query method

	*

	* @param	string	$query		Contains the SQL query which shall be executed

	* @param	int		$cache_ttl	Either 0 to avoid caching or the time in seconds which the result shall be kept in cache

	* @return	mixed				When casted to bool the returned value returns true on success and false on failure

	*

	* @access	public

	*/

	function sql_query($query = '', $cache_ttl = 0)

	{

		if ($query != '')

		{

			global $cache;

			// EXPLAIN only in extra debug mode

			if (defined('DEBUG_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 (($this->query_result = @mssql_query($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;

		// Since TOP is only returning a set number of rows we won't need it if total is set to 0 (return all rows)

		if ($total)

		{

			// We need to grab the total number of rows + the offset number of rows to get the correct result

			if (strpos($query, 'SELECT DISTINCT') === 0)

			{

				$query = 'SELECT DISTINCT TOP ' . ($total + $offset) . ' ' . substr($query, 15);

			}

			else

			{

				$query = 'SELECT TOP ' . ($total + $offset) . ' ' . substr($query, 6);

			}

		}

		$result = $this->sql_query($query, $cache_ttl);

		// Seek by $offset rows

		if ($offset)

		{

			$this->sql_rowseek($offset, $result);

		}

		return $result;

	}

	/**

	* Return number of affected rows

	*/

	function sql_affectedrows()

	{

		return ($this->db_connect_id) ? @mssql_rows_affected($this->db_connect_id) : false;

	}

	/**

	* Fetch current row

	*/

	function sql_fetchrow($query_id = false)

	{

		global $cache;

		if ($query_id === false)

		{

			$query_id = $this->query_result;

		}

		if (isset($cache->sql_rowset[$query_id]))

		{

			return $cache->sql_fetchrow($query_id);

		}

		if ($query_id === false)

		{

			return false;

		}

		$row = @mssql_fetch_assoc($query_id);

		// I hope i am able to remove this later... hopefully only a PHP or MSSQL bug

		if ($row)

		{

			foreach ($row as $key => $value)

			{

				$row[$key] = ($value === ' ' || $value === NULL) ? '' : $value;

			}

		}

		return $row;

	}

	/**

	* Seek to given row number

	* rownum is zero-based

	*/

	function sql_rowseek($rownum, &$query_id)

	{

		global $cache;

		if ($query_id === false)

		{

			$query_id = $this->query_result;

		}

		if (isset($cache->sql_rowset[$query_id]))

		{

			return $cache->sql_rowseek($rownum, $query_id);

		}

		return ($query_id !== false) ? @mssql_data_seek($query_id, $rownum) : false;

	}

	/**

	* Get last inserted id after insert statement

	*/

	function sql_nextid()

	{

		$result_id = @mssql_query('SELECT SCOPE_IDENTITY()', $this->db_connect_id);

		if ($result_id)

		{

			if ($row = @mssql_fetch_assoc($result_id))

			{

				@mssql_free_result($result_id);

				return $row['computed'];

			}

			@mssql_free_result($result_id);

		}

		return false;

	}

	/**

	* Free sql result

	*/

	function sql_freeresult($query_id = false)

	{

		global $cache;

		if ($query_id === false)

		{

			$query_id = $this->query_result;

		}

		if (isset($cache->sql_rowset[$query_id]))

		{

			return $cache->sql_freeresult($query_id);

		}

		if (isset($this->open_queries[$query_id]))

		{

			unset($this->open_queries[$query_id]);

			return @mssql_free_result($query_id);

		}

		return false;

	}

	/**

	* Escape string used in sql query

	*/

	function sql_escape($msg)

	{

		return str_replace(array("'", "\0"), array("''", ''), $msg);

	}

	/**

	* Build LIKE expression

	* @access private

	*/

	function _sql_like_expression($expression)

	{

		return $expression . " ESCAPE '\\'";

	}

	/**

	* return sql error array

	* @access private

	*/

	function _sql_error()

	{

		$error = array(

			'message'	=> @mssql_get_last_message(),

			'code'		=> ''

		);

		// Get error code number

		$result_id = @mssql_query('SELECT @@ERROR as code', $this->db_connect_id);

		if ($result_id)

		{

			$row = @mssql_fetch_assoc($result_id);

			$error['code'] = $row['code'];

			@mssql_free_result($result_id);

		}

		// Get full error message if possible

		$sql = 'SELECT CAST(description as varchar(255)) as message

			FROM master.dbo.sysmessages

			WHERE error = ' . $error['code'];

		$result_id = @mssql_query($sql);

		if ($result_id)

		{

			$row = @mssql_fetch_assoc($result_id);

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

			{

				$error['message'] .= '
' . $row['message'];

			}

			@mssql_free_result($result_id);

		}

		return $error;

	}

	/**

	* Build db-specific query data

	* @access private

	*/

	function _sql_custom_build($stage, $data)

	{

		return $data;

	}

	/**

	* Close sql connection

	* @access private

	*/

	function _sql_close()

	{

		return @mssql_close($this->db_connect_id);

	}

	/**

	* Build db-specific report

	* @access private

	*/

	function _sql_report($mode, $query = '')

	{

		switch ($mode)

		{

			case 'start':

				$html_table = false;

				@mssql_query('SET SHOWPLAN_TEXT ON;', $this->db_connect_id);

				if ($result = @mssql_query($query, $this->db_connect_id))

				{

					@mssql_next_result($result);

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

					{

						$html_table = $this->sql_report('add_select_row', $query, $html_table, $row);

					}

				}

				@mssql_query('SET SHOWPLAN_TEXT OFF;', $this->db_connect_id);

				@mssql_free_result($result);

				if ($html_table)

				{

					$this->html_hold .= '';

				}

			break;

			case 'fromcache':

				$endtime = explode(' ', microtime());

				$endtime = $endtime[0] + $endtime[1];

				$result = @mssql_query($query, $this->db_connect_id);

				while ($void = @mssql_fetch_assoc($result))

				{

					// Take the time spent on parsing rows into account

				}

				@mssql_free_result($result);

				$splittime = explode(' ', microtime());

				$splittime = $splittime[0] + $splittime[1];

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

			break;

		}

	}

}

?>