mssql.php
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	<?php
	// vim: set et ts=4 sw=4 fdm=marker:
	// +----------------------------------------------------------------------+
	// \| PHP versions 4 and 5 \|
	// +----------------------------------------------------------------------+
	// \| Copyright (c) 1998-2008 Manuel Lemos, Tomas V.V.Cox, \|
	// \| Stig. S. Bakken, Lukas Smith, Frank M. Kromann \|
	// \| All rights reserved. \|
	// +----------------------------------------------------------------------+
	// \| MDB2 is a merge of PEAR DB and Metabases that provides a unified DB \|
	// \| API as well as database abstraction for PHP applications. \|
	// \| This LICENSE is in the BSD license style. \|
	// \| \|
	// \| Redistribution and use in source and binary forms, with or without \|
	// \| modification, are permitted provided that the following conditions \|
	// \| are met: \|
	// \| \|
	// \| Redistributions of source code must retain the above copyright \|
	// \| notice, this list of conditions and the following disclaimer. \|
	// \| \|
	// \| Redistributions in binary form must reproduce the above copyright \|
	// \| notice, this list of conditions and the following disclaimer in the \|
	// \| documentation and/or other materials provided with the distribution. \|
	// \| \|
	// \| Neither the name of Manuel Lemos, Tomas V.V.Cox, Stig. S. Bakken, \|
	// \| Lukas Smith nor the names of his contributors may be used to endorse \|
	// \| or promote products derived from this software without specific prior\|
	// \| written permission. \|
	// \| \|
	// \| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS \|
	// \| "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT \|
	// \| LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS \|
	// \| FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE \|
	// \| REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, \|
	// \| INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, \|
	// \| BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS\|
	// \| OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED \|
	// \| AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT \|
	// \| LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY\|
	// \| WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE \|
	// \| POSSIBILITY OF SUCH DAMAGE. \|
	// +----------------------------------------------------------------------+
	// \| Author: Frank M. Kromann <frank@kromann.info> \|
	// +----------------------------------------------------------------------+
	//
	// $Id: mssql.php 295587 2010-02-28 17:16:38Z quipo $
	//
	// {{{ Class MDB2_Driver_mssql
	/**
	* MDB2 MSSQL Server driver
	*
	* @package MDB2
	* @category Database
	* @author Frank M. Kromann <frank@kromann.info>
	*/
	class MDB2_Driver_mssql extends MDB2_Driver_Common
	{
	// {{{ properties

	var $string_quoting = array('start' => "'", 'end' => "'", 'escape' => "'", 'escape_pattern' => false);

	var $identifier_quoting = array('start' => '[', 'end' => ']', 'escape' => ']');

	// }}}
	// {{{ constructor

	/**
	* Constructor
	*/
	function __construct()
	{
	parent::__construct();

	$this->phptype = 'mssql';
	$this->dbsyntax = 'mssql';

	$this->supported['sequences'] = 'emulated';
	$this->supported['indexes'] = true;
	$this->supported['affected_rows'] = true;
	$this->supported['transactions'] = true;
	$this->supported['savepoints'] = false;
	$this->supported['summary_functions'] = true;
	$this->supported['order_by_text'] = true;
	$this->supported['current_id'] = 'emulated';
	$this->supported['limit_queries'] = 'emulated';
	$this->supported['LOBs'] = true;
	$this->supported['replace'] = 'emulated';
	$this->supported['sub_selects'] = true;
	$this->supported['triggers'] = true;
	$this->supported['auto_increment'] = true;
	$this->supported['primary_key'] = true;
	$this->supported['result_introspection'] = true;
	$this->supported['prepared_statements'] = 'emulated';
	$this->supported['pattern_escaping'] = true;
	$this->supported['new_link'] = true;

	$this->options['DBA_username'] = false;
	$this->options['DBA_password'] = false;
	$this->options['database_device'] = false;
	$this->options['database_size'] = false;
	$this->options['max_identifiers_length'] = 128; // MS Access: 64
	}

	// }}}
	// {{{ errorInfo()

	/**
	* This method is used to collect information about an error
	*
	* @param integer $error
	* @return array
	* @access public
	*/
	function errorInfo($error = null, $connection = null)
	{
	if (null === $connection) {
	$connection = $this->connection;
	}

	$native_code = null;
	if ($connection) {
	$result = @mssql_query('select @@ERROR as ErrorCode', $connection);
	if ($result) {
	$native_code = @mssql_result($result, 0, 0);
	@mssql_free_result($result);
	}
	}
	$native_msg = @mssql_get_last_message();
	if (null === $error) {
	static $ecode_map;
	if (empty($ecode_map)) {
	$ecode_map = array(
	102 => MDB2_ERROR_SYNTAX,
	110 => MDB2_ERROR_VALUE_COUNT_ON_ROW,
	155 => MDB2_ERROR_NOSUCHFIELD,
	156 => MDB2_ERROR_SYNTAX,
	170 => MDB2_ERROR_SYNTAX,
	207 => MDB2_ERROR_NOSUCHFIELD,
	208 => MDB2_ERROR_NOSUCHTABLE,
	245 => MDB2_ERROR_INVALID_NUMBER,
	319 => MDB2_ERROR_SYNTAX,
	321 => MDB2_ERROR_NOSUCHFIELD,
	325 => MDB2_ERROR_SYNTAX,
	336 => MDB2_ERROR_SYNTAX,
	515 => MDB2_ERROR_CONSTRAINT_NOT_NULL,
	547 => MDB2_ERROR_CONSTRAINT,
	911 => MDB2_ERROR_NOT_FOUND,
	1018 => MDB2_ERROR_SYNTAX,
	1035 => MDB2_ERROR_SYNTAX,
	1801 => MDB2_ERROR_ALREADY_EXISTS,
	1913 => MDB2_ERROR_ALREADY_EXISTS,
	2209 => MDB2_ERROR_SYNTAX,
	2223 => MDB2_ERROR_SYNTAX,
	2248 => MDB2_ERROR_SYNTAX,
	2256 => MDB2_ERROR_SYNTAX,
	2257 => MDB2_ERROR_SYNTAX,
	2627 => MDB2_ERROR_CONSTRAINT,
	2714 => MDB2_ERROR_ALREADY_EXISTS,
	3607 => MDB2_ERROR_DIVZERO,
	3701 => MDB2_ERROR_NOSUCHTABLE,
	7630 => MDB2_ERROR_SYNTAX,
	8134 => MDB2_ERROR_DIVZERO,
	9303 => MDB2_ERROR_SYNTAX,
	9317 => MDB2_ERROR_SYNTAX,
	9318 => MDB2_ERROR_SYNTAX,
	9331 => MDB2_ERROR_SYNTAX,
	9332 => MDB2_ERROR_SYNTAX,
	15253 => MDB2_ERROR_SYNTAX,
	);
	}
	if (isset($ecode_map[$native_code])) {
	if ($native_code == 3701
	&& preg_match('/Cannot drop the index/i', $native_msg)
	) {
	$error = MDB2_ERROR_NOT_FOUND;
	} else {
	$error = $ecode_map[$native_code];
	}
	}
	}
	return array($error, $native_code, $native_msg);
	}

	// }}}
	// {{{ function escapePattern($text)

	/**
	* Quotes pattern (% and _) characters in a string)
	*
	* @param string the input string to quote
	*
	* @return string quoted string
	*
	* @access public
	*/
	function escapePattern($text)
	{
	$text = str_replace("[", "[ [ ]", $text);
	foreach ($this->wildcards as $wildcard) {
	$text = str_replace($wildcard, '[' . $wildcard . ']', $text);
	}
	return $text;
	}

	// }}}
	// {{{ escape()

	/**
	* Quotes a string so it can be safely used in a query. It will quote
	* the text so it can safely be used within a query.
	*
	* @param string $text the input string to quote
	* @param bool $escape_wildcards flag
	*
	* @return string quoted string
	* @access public
	*/
	function escape($text, $escape_wildcards = false)
	{
	$text = parent::escape($text, $escape_wildcards);
	// http://pear.php.net/bugs/bug.php?id=16118
	// http://support.microsoft.com/kb/164291
	return preg_replace("/\\\\(\r\n\|\r\|\n)/", '\\\\$1', $text);
	}

	// }}}
	// {{{ beginTransaction()

	/**
	* Start a transaction or set a savepoint.
	*
	* @param string $savepoint name of a savepoint to set
	*
	* @return mixed MDB2_OK on success, a MDB2 error on failure
	* @access public
	*/
	function beginTransaction($savepoint = null)
	{
	$this->debug('Starting transaction/savepoint', __FUNCTION__, array('is_manip' => true, 'savepoint' => $savepoint));
	if (null !== $savepoint) {
	if (!$this->in_transaction) {
	return $this->raiseError(MDB2_ERROR_INVALID, null, null,
	'savepoint cannot be released when changes are auto committed', __FUNCTION__);
	}
	$query = 'SAVE TRANSACTION '.$savepoint;
	return $this->_doQuery($query, true);
	}
	if ($this->in_transaction) {
	return MDB2_OK; //nothing to do
	}
	if (!$this->destructor_registered && $this->opened_persistent) {
	$this->destructor_registered = true;
	register_shutdown_function('MDB2_closeOpenTransactions');
	}
	$result =& $this->_doQuery('BEGIN TRANSACTION', true);
	if (PEAR::isError($result)) {
	return $result;
	}
	$this->in_transaction = true;
	return MDB2_OK;
	}

	// }}}
	// {{{ commit()

	/**
	* Commit the database changes done during a transaction that is in
	* progress or release a savepoint. This function may only be called when
	* auto-committing is disabled, otherwise it will fail. Therefore, a new
	* transaction is implicitly started after committing the pending changes.
	*
	* @param string $savepoint name of a savepoint to release
	*
	* @return mixed MDB2_OK on success, a MDB2 error on failure
	* @access public
	*/
	function commit($savepoint = null)
	{
	$this->debug('Committing transaction/savepoint', __FUNCTION__, array('is_manip' => true, 'savepoint' => $savepoint));
	if (!$this->in_transaction) {
	return $this->raiseError(MDB2_ERROR_INVALID, null, null,
	'commit/release savepoint cannot be done changes are auto committed', __FUNCTION__);
	}
	if (null !== $savepoint) {
	return MDB2_OK;
	}

	$result =& $this->_doQuery('COMMIT TRANSACTION', true);
	if (PEAR::isError($result)) {
	return $result;
	}
	$this->in_transaction = false;
	return MDB2_OK;
	}

	// }}}
	// {{{ rollback()

	/**
	* Cancel any database changes done during a transaction or since a specific
	* savepoint that is in progress. This function may only be called when
	* auto-committing is disabled, otherwise it will fail. Therefore, a new
	* transaction is implicitly started after canceling the pending changes.
	*
	* @param string $savepoint name of a savepoint to rollback to
	*
	* @return mixed MDB2_OK on success, a MDB2 error on failure
	* @access public
	*/
	function rollback($savepoint = null)
	{
	$this->debug('Rolling back transaction/savepoint', __FUNCTION__, array('is_manip' => true, 'savepoint' => $savepoint));
	if (!$this->in_transaction) {
	return $this->raiseError(MDB2_ERROR_INVALID, null, null,
	'rollback cannot be done changes are auto committed', __FUNCTION__);
	}
	if (null !== $savepoint) {
	$query = 'ROLLBACK TRANSACTION '.$savepoint;
	return $this->_doQuery($query, true);
	}

	$result =& $this->_doQuery('ROLLBACK TRANSACTION', true);
	if (PEAR::isError($result)) {
	return $result;
	}
	$this->in_transaction = false;
	return MDB2_OK;
	}

	// }}}
	// {{{ _doConnect()

	/**
	* do the grunt work of the connect
	*
	* @param string $username
	* @param string $password
	* @param boolean $persistent
	*
	* @return connection on success or MDB2 Error Object on failure
	* @access protected
	*/
	function _doConnect($username, $password, $persistent = false)
	{
	if ( !PEAR::loadExtension($this->phptype)
	&& !PEAR::loadExtension('sybase_ct')
	&& !PEAR::loadExtension('odbtp')
	&& !function_exists('mssql_connect')
	) {
	return $this->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
	'extension '.$this->phptype.' is not compiled into PHP', __FUNCTION__);
	}

	$params = array(
	$this->dsn['hostspec'] ? $this->dsn['hostspec'] : 'localhost',
	$username ? $username : null,
	$password ? $password : null,
	);
	if ($this->dsn['port']) {
	$params[0].= ((substr(PHP_OS, 0, 3) == 'WIN') ? ',' : ':').$this->dsn['port'];
	}
	if (!$persistent) {
	if ($this->_isNewLinkSet()) {
	$params[] = true;
	} else {
	$params[] = false;
	}
	}

	$connect_function = $persistent ? 'mssql_pconnect' : 'mssql_connect';

	$connection = @call_user_func_array($connect_function, $params);
	if ($connection <= 0) {
	return $this->raiseError(MDB2_ERROR_CONNECT_FAILED, null, null,
	'unable to establish a connection', __FUNCTION__, __FUNCTION__);
	}

	@mssql_query('SET ANSI_NULL_DFLT_ON ON', $connection);

	/*
	if (!empty($this->dsn['charset'])) {
	$result = $this->setCharset($this->dsn['charset'], $connection);
	if (PEAR::isError($result)) {
	return $result;
	}
	}
	*/

	if ((bool)ini_get('mssql.datetimeconvert')) {
	// his isn't the most elegant way of doing it but it prevents from
	// breaking anything thus preserves BC. Bug #11849
	if (isset($this->options['datetimeconvert']) && (bool)$this->options['datetimeconvert'] !== false) {
	@ini_set('mssql.datetimeconvert', '1');
	} else {
	@ini_set('mssql.datetimeconvert', '0');
	}
	}

	if (empty($this->dsn['disable_iso_date'])) {
	@mssql_query('SET DATEFORMAT ymd', $connection);
	}

	return $connection;
	}

	// }}}
	// {{{ connect()

	/**
	* Connect to the database
	*
	* @return true on success, MDB2 Error Object on failure
	*/
	function connect()
	{
	if (is_resource($this->connection)) {
	//if (count(array_diff($this->connected_dsn, $this->dsn)) == 0
	if (MDB2::areEquals($this->connected_dsn, $this->dsn)
	&& $this->opened_persistent == $this->options['persistent']
	) {
	return MDB2_OK;
	}
	$this->disconnect(false);
	}

	$connection = $this->_doConnect(
	$this->dsn['username'],
	$this->dsn['password'],
	$this->options['persistent']
	);
	if (PEAR::isError($connection)) {
	return $connection;
	}

	$this->connection = $connection;
	$this->connected_dsn = $this->dsn;
	$this->connected_database_name = '';
	$this->opened_persistent = $this->options['persistent'];
	$this->dbsyntax = $this->dsn['dbsyntax'] ? $this->dsn['dbsyntax'] : $this->phptype;

	if ($this->database_name) {
	if ($this->database_name != $this->connected_database_name) {
	if (!@mssql_select_db($this->database_name, $connection)) {
	$err = $this->raiseError(null, null, null,
	'Could not select the database: '.$this->database_name, __FUNCTION__);
	return $err;
	}
	$this->connected_database_name = $this->database_name;
	}
	}

	return MDB2_OK;
	}

	// }}}
	// {{{ databaseExists()

	/**
	* check if given database name is exists?
	*
	* @param string $name name of the database that should be checked
	*
	* @return mixed true/false on success, a MDB2 error on failure
	* @access public
	*/
	function databaseExists($name)
	{
	$connection = $this->_doConnect($this->dsn['username'],
	$this->dsn['password'],
	$this->options['persistent']);
	if (PEAR::isError($connection)) {
	return $connection;
	}

	$result = @mssql_select_db($name, $connection);
	$errorInfo = $this->errorInfo(null, $connection);
	@mssql_close($connection);
	if (!$result) {
	if ($errorInfo[0] != MDB2_ERROR_NOT_FOUND) {
	exit;
	$result = $this->raiseError($errorInfo[0], null, null, $errorInfo[2], __FUNCTION__);
	return $result;
	}
	$result = false;
	}

	return $result;
	}

	// }}}
	// {{{ disconnect()

	/**
	* Log out and disconnect from the database.
	*
	* @param boolean $force if the disconnect should be forced even if the
	* connection is opened persistently
	* @return mixed true on success, false if not connected and error
	* object on error
	* @access public
	*/
	function disconnect($force = true)
	{
	if (is_resource($this->connection)) {
	if ($this->in_transaction) {
	$dsn = $this->dsn;
	$database_name = $this->database_name;
	$persistent = $this->options['persistent'];
	$this->dsn = $this->connected_dsn;
	$this->database_name = $this->connected_database_name;
	$this->options['persistent'] = $this->opened_persistent;
	$this->rollback();
	$this->dsn = $dsn;
	$this->database_name = $database_name;
	$this->options['persistent'] = $persistent;
	}

	if (!$this->opened_persistent \|\| $force) {
	$ok = @mssql_close($this->connection);
	if (!$ok) {
	return $this->raiseError(MDB2_ERROR_DISCONNECT_FAILED,
	null, null, null, __FUNCTION__);
	}
	}
	} else {
	return false;
	}
	return parent::disconnect($force);
	}

	// }}}
	// {{{ standaloneQuery()

	/**
	* execute a query as DBA
	*
	* @param string $query the SQL query
	* @param mixed $types array that contains the types of the columns in
	* the result set
	* @param boolean $is_manip if the query is a manipulation query
	* @return mixed MDB2_OK on success, a MDB2 error on failure
	* @access public
	*/
	function standaloneQuery($query, $types = null, $is_manip = false)
	{
	$user = $this->options['DBA_username']? $this->options['DBA_username'] : $this->dsn['username'];
	$pass = $this->options['DBA_password']? $this->options['DBA_password'] : $this->dsn['password'];
	$connection = $this->_doConnect($user, $pass, $this->options['persistent']);
	if (PEAR::isError($connection)) {
	return $connection;
	}

	$offset = $this->offset;
	$limit = $this->limit;
	$this->offset = $this->limit = 0;
	$query = $this->_modifyQuery($query, $is_manip, $limit, $offset);

	$result = $this->_doQuery($query, $is_manip, $connection, $this->database_name);
	if (!PEAR::isError($result)) {
	$result = $this->_affectedRows($connection, $result);
	}

	@mssql_close($connection);
	return $result;
	}

	// }}}
	// {{{ _doQuery()

	/**
	* Execute a query
	* @param string $query query
	* @param boolean $is_manip if the query is a manipulation query
	* @param resource $connection
	* @param string $database_name
	* @return result or error object
	* @access protected
	*/
	function _doQuery($query, $is_manip = false, $connection = null, $database_name = null)
	{
	$this->last_query = $query;
	$result = $this->debug($query, 'query', array('is_manip' => $is_manip, 'when' => 'pre'));
	if ($result) {
	if (PEAR::isError($result)) {
	return $result;
	}
	$query = $result;
	}
	if ($this->options['disable_query']) {
	$result = $is_manip ? 0 : null;
	return $result;
	}

	if (null === $connection) {
	$connection = $this->getConnection();
	if (PEAR::isError($connection)) {
	return $connection;
	}
	}
	if (null === $database_name) {
	$database_name = $this->database_name;
	}

	if ($database_name) {
	if ($database_name != $this->connected_database_name) {
	if (!@mssql_select_db($database_name, $connection)) {
	$err = $this->raiseError(null, null, null,
	'Could not select the database: '.$database_name, __FUNCTION__);
	return $err;
	}
	$this->connected_database_name = $database_name;
	}
	}

	$result = @mssql_query($query, $connection);
	if (!$result) {
	$err = $this->raiseError(null, null, null,
	'Could not execute statement', __FUNCTION__);
	return $err;
	}

	$this->debug($query, 'query', array('is_manip' => $is_manip, 'when' => 'post', 'result' => $result));
	return $result;
	}

	// }}}
	// {{{ _affectedRows()

	/**
	* Returns the number of rows affected
	*
	* @param resource $result
	* @param resource $connection
	* @return mixed MDB2 Error Object or the number of rows affected
	* @access private
	*/
	function _affectedRows($connection, $result = null)
	{
	if (null === $connection) {
	$connection = $this->getConnection();
	if (PEAR::isError($connection)) {
	return $connection;
	}
	}
	return @mssql_rows_affected($connection);
	}

	// }}}
	// {{{ _modifyQuery()

	/**
	* Changes a query string for various DBMS specific reasons
	*
	* @param string $query query to modify
	* @param boolean $is_manip if it is a DML query
	* @param integer $limit limit the number of rows
	* @param integer $offset start reading from given offset
	* @return string modified query
	* @access protected
	*/
	function _modifyQuery($query, $is_manip, $limit, $offset)
	{
	if ($limit > 0) {
	$fetch = $offset + $limit;
	if (!$is_manip) {
	return preg_replace('/^([\s(])SELECT( DISTINCT)?(?!\sTOP\s*\()/i',
	"\\1SELECT\\2 TOP $fetch", $query);
	}
	}
	return $query;
	}

	// }}}
	// {{{ getServerVersion()

	/**
	* return version information about the server
	*
	* @param bool $native determines if the raw version string should be returned
	* @return mixed array/string with version information or MDB2 error object
	* @access public
	*/
	function getServerVersion($native = false)
	{
	if ($this->connected_server_info) {
	$server_info = $this->connected_server_info;
	} else {
	$query = 'SELECT @@VERSION';
	$server_info = $this->queryOne($query, 'text');
	if (PEAR::isError($server_info)) {
	return $server_info;
	}
	}
	// cache server_info
	$this->connected_server_info = $server_info;
	if (!$native && !PEAR::isError($server_info)) {
	if (preg_match('/(\d+)\.(\d+)\.(\d+)/', $server_info, $tmp)) {
	$server_info = array(
	'major' => $tmp[1],
	'minor' => $tmp[2],
	'patch' => $tmp[3],
	'extra' => null,
	'native' => $server_info,
	);
	} else {
	$server_info = array(
	'major' => null,
	'minor' => null,
	'patch' => null,
	'extra' => null,
	'native' => $server_info,
	);
	}
	}
	return $server_info;
	}

	// }}}
	// {{{ _checkSequence

	/**
	* Checks if there's a sequence that exists.
	*
	* @param string $seq_name The sequence name to verify.
	* @return bool $tableExists The value if the table exists or not
	* @access private
	*/
	function _checkSequence($seq_name)
	{
	$query = "SELECT * FROM $seq_name";
	$tableExists = $this->_doQuery($query, true);
	if (PEAR::isError($tableExists)) {
	if ($tableExists->getCode() == MDB2_ERROR_NOSUCHTABLE) {
	return false;
	}
	//return $tableExists;
	return false;
	}
	return mssql_result($tableExists, 0, 0);
	}

	// }}}
	// {{{ nextID()

	/**
	* Returns the next free id of a sequence
	*
	* @param string $seq_name name of the sequence
	* @param boolean $ondemand when true the sequence is
	* automatic created, if it
	* not exists
	*
	* @return mixed MDB2 Error Object or id
	* @access public
	*/
	function nextID($seq_name, $ondemand = true)
	{
	$sequence_name = $this->quoteIdentifier($this->getSequenceName($seq_name), true);
	$seqcol_name = $this->quoteIdentifier($this->options['seqcol_name'], true);
	$this->pushErrorHandling(PEAR_ERROR_RETURN);
	$this->expectError(MDB2_ERROR_NOSUCHTABLE);

	$seq_val = $this->_checkSequence($sequence_name);

	if ($seq_val) {
	$query = "SET IDENTITY_INSERT $sequence_name OFF ".
	"INSERT INTO $sequence_name DEFAULT VALUES";
	} else {
	$query = "INSERT INTO $sequence_name ($seqcol_name) VALUES (0)";
	}
	$result = $this->_doQuery($query, true);
	$this->popExpect();
	$this->popErrorHandling();
	if (PEAR::isError($result)) {
	if ($ondemand && !$this->_checkSequence($sequence_name)) {
	$this->loadModule('Manager', null, true);
	$result = $this->manager->createSequence($seq_name);
	if (PEAR::isError($result)) {
	return $this->raiseError($result, null, null,
	'on demand sequence '.$seq_name.' could not be created', __FUNCTION__);
	} else {
	/**
	* Little off-by-one problem with the sequence emulation
	* here being fixed, that instead of re-calling nextID
	* and forcing an increment by one, we simply check if it
	* exists, then we get the last inserted id if it does.
	*
	* In theory, $seq_name should be created otherwise there would
	* have been an error thrown somewhere up there..
	*
	* @todo confirm
	*/
	if ($this->_checkSequence($seq_name)) {
	return $this->lastInsertID($seq_name);
	}

	return $this->nextID($seq_name, false);
	}
	}
	return $result;
	}
	$value = $this->lastInsertID($sequence_name);
	if (is_numeric($value)) {
	$query = "DELETE FROM $sequence_name WHERE $seqcol_name < $value";
	$result = $this->_doQuery($query, true);
	if (PEAR::isError($result)) {
	$this->warnings[] = 'nextID: could not delete previous sequence table values from '.$seq_name;
	}
	}
	return $value;
	}

	// }}}
	// {{{ lastInsertID()

	/**
	* Returns the autoincrement ID if supported or $id or fetches the current
	* ID in a sequence called: $table.(empty($field) ? '' : '_'.$field)
	*
	* @param string $table name of the table into which a new row was inserted
	* @param string $field name of the field into which a new row was inserted
	*
	* @return mixed MDB2 Error Object or id
	* @access public
	*/
	function lastInsertID($table = null, $field = null)
	{
	$server_info = $this->getServerVersion();
	if (is_array($server_info) && (null !== $server_info['major'])
	&& $server_info['major'] >= 8
	) {
	$query = "SELECT IDENT_CURRENT('$table')";
	} else {
	$query = "SELECT @@IDENTITY";
	if (null !== $table) {
	$query .= ' FROM '.$this->quoteIdentifier($table, true);
	}
	}

	return $this->queryOne($query, 'integer');
	}

	// }}}
	}

	// }}}
	// {{{ Class MDB2_Result_mssql

	/**
	* MDB2 MSSQL Server result driver
	*
	* @package MDB2
	* @category Database
	* @author Frank M. Kromann <frank@kromann.info>
	*/
	class MDB2_Result_mssql extends MDB2_Result_Common
	{
	// {{{ _skipLimitOffset()

	/**
	* Skip the first row of a result set.
	*
	* @param resource $result
	* @return mixed a result handle or MDB2_OK on success, a MDB2 error on failure
	* @access protected
	*/
	function _skipLimitOffset()
	{
	if ($this->limit) {
	if ($this->rownum >= $this->limit) {
	return false;
	}
	}
	if ($this->offset) {
	while ($this->offset_count < $this->offset) {
	++$this->offset_count;
	if (!is_array(@mssql_fetch_row($this->result))) {
	$this->offset_count = $this->limit;
	return false;
	}
	}
	}
	return MDB2_OK;
	}

	// }}}
	// {{{ fetchRow()

	/**
	* Fetch a row and insert the data into an existing array.
	*
	* @param int $fetchmode how the array data should be indexed
	* @param int $rownum number of the row where the data can be found
	*
	* @return int data array on success, a MDB2 error on failure
	* @access public
	*/
	function fetchRow($fetchmode = MDB2_FETCHMODE_DEFAULT, $rownum = null)
	{
	if (!$this->_skipLimitOffset()) {
	return null;
	}
	if (null !== $rownum) {
	$seek = $this->seek($rownum);
	if (PEAR::isError($seek)) {
	return $seek;
	}
	}
	if ($fetchmode == MDB2_FETCHMODE_DEFAULT) {
	$fetchmode = $this->db->fetchmode;
	}
	if ($fetchmode & MDB2_FETCHMODE_ASSOC) {
	$row = @mssql_fetch_assoc($this->result);
	if (is_array($row)
	&& $this->db->options['portability'] & MDB2_PORTABILITY_FIX_CASE
	) {
	$row = array_change_key_case($row, $this->db->options['field_case']);
	}
	} else {
	$row = @mssql_fetch_row($this->result);
	}
	if (!$row) {
	if (false === $this->result) {
	$err = $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
	'resultset has already been freed', __FUNCTION__);
	return $err;
	}
	return null;
	}
	$mode = $this->db->options['portability'] & MDB2_PORTABILITY_EMPTY_TO_NULL;
	$rtrim = false;
	if ($this->db->options['portability'] & MDB2_PORTABILITY_RTRIM) {
	if (empty($this->types)) {
	$mode += MDB2_PORTABILITY_RTRIM;
	} else {
	$rtrim = true;
	}
	}
	if ($mode) {
	$this->db->_fixResultArrayValues($row, $mode);
	}
	if (!empty($this->types)) {
	$row = $this->db->datatype->convertResultRow($this->types, $row, $rtrim);
	}
	if (!empty($this->values)) {
	$this->_assignBindColumns($row);
	}
	if ($fetchmode === MDB2_FETCHMODE_OBJECT) {
	$object_class = $this->db->options['fetch_class'];
	if ($object_class == 'stdClass') {
	$row = (object) $row;
	} else {
	$rowObj = new $object_class($row);
	$row = $rowObj;
	}
	}
	++$this->rownum;
	return $row;
	}

	// }}}
	// {{{ _getColumnNames()

	/**
	* Retrieve the names of columns returned by the DBMS in a query result.
	*
	* @return mixed Array variable that holds the names of columns as keys
	* or an MDB2 error on failure.
	* Some DBMS may not return any columns when the result set
	* does not contain any rows.
	* @access private
	*/
	function _getColumnNames()
	{
	$columns = array();
	$numcols = $this->numCols();
	if (PEAR::isError($numcols)) {
	return $numcols;
	}
	for ($column = 0; $column < $numcols; $column++) {
	$column_name = @mssql_field_name($this->result, $column);
	$columns[$column_name] = $column;
	}
	if ($this->db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
	$columns = array_change_key_case($columns, $this->db->options['field_case']);
	}
	return $columns;
	}

	// }}}
	// {{{ numCols()

	/**
	* Count the number of columns returned by the DBMS in a query result.
	*
	* @return mixed integer value with the number of columns, a MDB2 error
	* on failure
	* @access public
	*/
	function numCols()
	{
	$cols = @mssql_num_fields($this->result);
	if (null === $cols) {
	if (false === $this->result) {
	return $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
	'resultset has already been freed', __FUNCTION__);
	}
	if (null === $this->result) {
	return count($this->types);
	}
	return $this->db->raiseError(null, null, null,
	'Could not get column count', __FUNCTION__);
	}
	return $cols;
	}

	// }}}
	// {{{ nextResult()

	/**
	* Move the internal result pointer to the next available result
	*
	* @return true on success, false if there is no more result set or an error object on failure
	* @access public
	*/
	function nextResult()
	{
	if (false === $this->result) {
	return $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
	'resultset has already been freed', __FUNCTION__);
	}
	if (null === $this->result) {
	return false;
	}
	return @mssql_next_result($this->result);
	}

	// }}}
	// {{{ free()

	/**
	* Free the internal resources associated with $result.
	*
	* @return boolean true on success, false if $result is invalid
	* @access public
	*/
	function free()
	{
	if (is_resource($this->result) && $this->db->connection) {
	$free = @mssql_free_result($this->result);
	if (false === $free) {
	return $this->db->raiseError(null, null, null,
	'Could not free result', __FUNCTION__);
	}
	}
	$this->result = false;
	return MDB2_OK;
	}

	// }}}
	}

	// }}}
	// {{{ class MDB2_BufferedResult_mssql

	/**
	* MDB2 MSSQL Server buffered result driver
	*
	* @package MDB2
	* @category Database
	* @author Frank M. Kromann <frank@kromann.info>
	*/
	class MDB2_BufferedResult_mssql extends MDB2_Result_mssql
	{
	// {{{ seek()

	/**
	* Seek to a specific row in a result set
	*
	* @param int $rownum number of the row where the data can be found
	*
	* @return mixed MDB2_OK on success, a MDB2 error on failure
	* @access public
	*/
	function seek($rownum = 0)
	{
	if ($this->rownum != ($rownum - 1) && !@mssql_data_seek($this->result, $rownum)) {
	if (false === $this->result) {
	return $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
	'resultset has already been freed', __FUNCTION__);
	}
	if (null === $this->result) {
	return MDB2_OK;
	}
	return $this->db->raiseError(MDB2_ERROR_INVALID, null, null,
	'tried to seek to an invalid row number ('.$rownum.')', __FUNCTION__);
	}
	$this->rownum = $rownum - 1;
	return MDB2_OK;
	}

	// }}}
	// {{{ valid()

	/**
	* Check if the end of the result set has been reached
	*
	* @return mixed true or false on sucess, a MDB2 error on failure
	* @access public
	*/
	function valid()
	{
	$numrows = $this->numRows();
	if (PEAR::isError($numrows)) {
	return $numrows;
	}
	return $this->rownum < ($numrows - 1);
	}

	// }}}
	// {{{ numRows()

	/**
	* Returns the number of rows in a result object
	*
	* @return mixed MDB2 Error Object or the number of rows
	* @access public
	*/
	function numRows()
	{
	$rows = @mssql_num_rows($this->result);
	if (null === $rows) {
	if (false === $this->result) {
	return $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
	'resultset has already been freed', __FUNCTION__);
	}
	if (null === $this->result) {
	return 0;
	}
	return $this->db->raiseError(null, null, null,
	'Could not get row count', __FUNCTION__);
	}
	if ($this->limit) {
	$rows -= $this->offset;
	if ($rows > $this->limit + 1) {
	$rows = $this->limit + 1;
	}
	if ($rows < 0) {
	$rows = 0;
	}
	}
	return $rows;
	}
	}

	// }}}
	// {{{ MDB2_Statement_mssql

	/**
	* MDB2 MSSQL Server statement driver
	*
	* @package MDB2
	* @category Database
	* @author Frank M. Kromann <frank@kromann.info>
	*/
	class MDB2_Statement_mssql extends MDB2_Statement_Common
	{

	}

	// }}}
	?>

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