mysqli.php
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	<?php
	// vim: set et ts=4 sw=4 fdm=marker:
	// +----------------------------------------------------------------------+
	// \| PHP versions 4 and 5 \|
	// +----------------------------------------------------------------------+
	// \| Copyright (c) 1998-2006 Manuel Lemos, Tomas V.V.Cox, \|
	// \| Stig. S. Bakken, Lukas Smith \|
	// \| 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: Lukas Smith <smith@pooteeweet.org> \|
	// +----------------------------------------------------------------------+
	//
	// $Id: mysqli.php,v 1.188 2008/03/13 03:31:55 afz Exp $
	//

	/**
	* MDB2 MySQLi driver
	*
	* @package MDB2
	* @category Database
	* @author Lukas Smith <smith@pooteeweet.org>
	*/
	class MDB2_Driver_mysqli extends MDB2_Driver_Common
	{
	// {{{ properties

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

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

	var $sql_comments = array(
	array('start' => '-- ', 'end' => "\n", 'escape' => false),
	array('start' => '#', 'end' => "\n", 'escape' => false),
	array('start' => '/', 'end' => '/', 'escape' => false),
	);

	var $server_capabilities_checked = false;

	var $start_transaction = false;

	var $varchar_max_length = 255;

	// }}}
	// {{{ constructor

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

	$this->phptype = 'mysqli';
	$this->dbsyntax = 'mysql';

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

	$this->options['DBA_username'] = false;
	$this->options['DBA_password'] = false;
	$this->options['default_table_type'] = '';
	$this->options['multi_query'] = false;
	$this->options['max_identifiers_length'] = 64;

	$this->_reCheckSupportedOptions();
	}

	// }}}
	// {{{ _reCheckSupportedOptions()

	/**
	* If the user changes certain options, other capabilities may depend
	* on the new settings, so we need to check them (again).
	*
	* @access private
	*/
	function _reCheckSupportedOptions()
	{
	$this->supported['transactions'] = $this->options['use_transactions'];
	$this->supported['savepoints'] = $this->options['use_transactions'];
	if ($this->options['default_table_type']) {
	switch (strtoupper($this->options['default_table_type'])) {
	case 'BLACKHOLE':
	case 'MEMORY':
	case 'ARCHIVE':
	case 'CSV':
	case 'HEAP':
	case 'ISAM':
	case 'MERGE':
	case 'MRG_ISAM':
	case 'ISAM':
	case 'MRG_MYISAM':
	case 'MYISAM':
	$this->supported['savepoints'] = false;
	$this->supported['transactions'] = false;
	$this->warnings[] = $this->options['default_table_type'] .
	' is not a supported default table type';
	break;
	}
	}
	}

	// }}}
	// {{{ function setOption($option, $value)

	/**
	* set the option for the db class
	*
	* @param string option name
	* @param mixed value for the option
	*
	* @return mixed MDB2_OK or MDB2 Error Object
	*
	* @access public
	*/
	function setOption($option, $value)
	{
	$res = parent::setOption($option, $value);
	$this->_reCheckSupportedOptions();
	}

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

	/**
	* This method is used to collect information about an error
	*
	* @param integer $error
	* @return array
	* @access public
	*/
	function errorInfo($error = null)
	{
	if ($this->connection) {
	$native_code = @mysqli_errno($this->connection);
	$native_msg = @mysqli_error($this->connection);
	} else {
	$native_code = @mysqli_connect_errno();
	$native_msg = @mysqli_connect_error();
	}
	if (is_null($error)) {
	static $ecode_map;
	if (empty($ecode_map)) {
	$ecode_map = array(
	1000 => MDB2_ERROR_INVALID, //hashchk
	1001 => MDB2_ERROR_INVALID, //isamchk
	1004 => MDB2_ERROR_CANNOT_CREATE,
	1005 => MDB2_ERROR_CANNOT_CREATE,
	1006 => MDB2_ERROR_CANNOT_CREATE,
	1007 => MDB2_ERROR_ALREADY_EXISTS,
	1008 => MDB2_ERROR_CANNOT_DROP,
	1009 => MDB2_ERROR_CANNOT_DROP,
	1010 => MDB2_ERROR_CANNOT_DROP,
	1011 => MDB2_ERROR_CANNOT_DELETE,
	1022 => MDB2_ERROR_ALREADY_EXISTS,
	1029 => MDB2_ERROR_NOT_FOUND,
	1032 => MDB2_ERROR_NOT_FOUND,
	1044 => MDB2_ERROR_ACCESS_VIOLATION,
	1045 => MDB2_ERROR_ACCESS_VIOLATION,
	1046 => MDB2_ERROR_NODBSELECTED,
	1048 => MDB2_ERROR_CONSTRAINT,
	1049 => MDB2_ERROR_NOSUCHDB,
	1050 => MDB2_ERROR_ALREADY_EXISTS,
	1051 => MDB2_ERROR_NOSUCHTABLE,
	1054 => MDB2_ERROR_NOSUCHFIELD,
	1060 => MDB2_ERROR_ALREADY_EXISTS,
	1061 => MDB2_ERROR_ALREADY_EXISTS,
	1062 => MDB2_ERROR_ALREADY_EXISTS,
	1064 => MDB2_ERROR_SYNTAX,
	1067 => MDB2_ERROR_INVALID,
	1072 => MDB2_ERROR_NOT_FOUND,
	1086 => MDB2_ERROR_ALREADY_EXISTS,
	1091 => MDB2_ERROR_NOT_FOUND,
	1100 => MDB2_ERROR_NOT_LOCKED,
	1109 => MDB2_ERROR_NOT_FOUND,
	1125 => MDB2_ERROR_ALREADY_EXISTS,
	1136 => MDB2_ERROR_VALUE_COUNT_ON_ROW,
	1138 => MDB2_ERROR_INVALID,
	1142 => MDB2_ERROR_ACCESS_VIOLATION,
	1143 => MDB2_ERROR_ACCESS_VIOLATION,
	1146 => MDB2_ERROR_NOSUCHTABLE,
	1149 => MDB2_ERROR_SYNTAX,
	1169 => MDB2_ERROR_CONSTRAINT,
	1176 => MDB2_ERROR_NOT_FOUND,
	1177 => MDB2_ERROR_NOSUCHTABLE,
	1213 => MDB2_ERROR_DEADLOCK,
	1216 => MDB2_ERROR_CONSTRAINT,
	1217 => MDB2_ERROR_CONSTRAINT,
	1227 => MDB2_ERROR_ACCESS_VIOLATION,
	1235 => MDB2_ERROR_CANNOT_CREATE,
	1299 => MDB2_ERROR_INVALID_DATE,
	1300 => MDB2_ERROR_INVALID,
	1304 => MDB2_ERROR_ALREADY_EXISTS,
	1305 => MDB2_ERROR_NOT_FOUND,
	1306 => MDB2_ERROR_CANNOT_DROP,
	1307 => MDB2_ERROR_CANNOT_CREATE,
	1334 => MDB2_ERROR_CANNOT_ALTER,
	1339 => MDB2_ERROR_NOT_FOUND,
	1356 => MDB2_ERROR_INVALID,
	1359 => MDB2_ERROR_ALREADY_EXISTS,
	1360 => MDB2_ERROR_NOT_FOUND,
	1363 => MDB2_ERROR_NOT_FOUND,
	1365 => MDB2_ERROR_DIVZERO,
	1451 => MDB2_ERROR_CONSTRAINT,
	1452 => MDB2_ERROR_CONSTRAINT,
	1542 => MDB2_ERROR_CANNOT_DROP,
	1546 => MDB2_ERROR_CONSTRAINT,
	1582 => MDB2_ERROR_CONSTRAINT,
	2003 => MDB2_ERROR_CONNECT_FAILED,
	2019 => MDB2_ERROR_INVALID,
	);
	}
	if ($this->options['portability'] & MDB2_PORTABILITY_ERRORS) {
	$ecode_map[1022] = MDB2_ERROR_CONSTRAINT;
	$ecode_map[1048] = MDB2_ERROR_CONSTRAINT_NOT_NULL;
	$ecode_map[1062] = MDB2_ERROR_CONSTRAINT;
	} else {
	// Doing this in case mode changes during runtime.
	$ecode_map[1022] = MDB2_ERROR_ALREADY_EXISTS;
	$ecode_map[1048] = MDB2_ERROR_CONSTRAINT;
	$ecode_map[1062] = MDB2_ERROR_ALREADY_EXISTS;
	}
	if (isset($ecode_map[$native_code])) {
	$error = $ecode_map[$native_code];
	}
	}
	return array($error, $native_code, $native_msg);
	}

	// }}}
	// {{{ 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 the input string to quote
	* @param bool escape wildcards
	*
	* @return string quoted string
	*
	* @access public
	*/
	function escape($text, $escape_wildcards = false)
	{
	if ($escape_wildcards) {
	$text = $this->escapePattern($text);
	}
	$connection = $this->getConnection();
	if (PEAR::isError($connection)) {
	return $connection;
	}
	$text = @mysqli_real_escape_string($connection, $text);
	return $text;
	}

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

	/**
	* Start a transaction or set a savepoint.
	*
	* @param string 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));
	$this->_getServerCapabilities();
	if (!is_null($savepoint)) {
	if (!$this->supports('savepoints')) {
	return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
	'savepoints are not supported', __FUNCTION__);
	}
	if (!$this->in_transaction) {
	return $this->raiseError(MDB2_ERROR_INVALID, null, null,
	'savepoint cannot be released when changes are auto committed', __FUNCTION__);
	}
	$query = 'SAVEPOINT '.$savepoint;
	return $this->_doQuery($query, true);
	} elseif ($this->in_transaction) {
	return MDB2_OK; //nothing to do
	}
	$query = $this->start_transaction ? 'START TRANSACTION' : 'SET AUTOCOMMIT = 1';
	$result =& $this->_doQuery($query, 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 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 $this->raiseError(MDB2_ERROR_INVALID, null, null,
	'commit/release savepoint cannot be done changes are auto committed', __FUNCTION__);
	}
	if (!is_null($savepoint)) {
	if (!$this->supports('savepoints')) {
	return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
	'savepoints are not supported', __FUNCTION__);
	}
	$server_info = $this->getServerVersion();
	if (version_compare($server_info['major'].'.'.$server_info['minor'].'.'.$server_info['patch'], '5.0.3', '<')) {
	return MDB2_OK;
	}
	$query = 'RELEASE SAVEPOINT '.$savepoint;
	return $this->_doQuery($query, true);
	}

	if (!$this->supports('transactions')) {
	return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
	'transactions are not supported', __FUNCTION__);
	}

	$result =& $this->_doQuery('COMMIT', true);
	if (PEAR::isError($result)) {
	return $result;
	}
	if (!$this->start_transaction) {
	$query = 'SET AUTOCOMMIT = 0';
	$result =& $this->_doQuery($query, 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 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 $this->raiseError(MDB2_ERROR_INVALID, null, null,
	'rollback cannot be done changes are auto committed', __FUNCTION__);
	}
	if (!is_null($savepoint)) {
	if (!$this->supports('savepoints')) {
	return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
	'savepoints are not supported', __FUNCTION__);
	}
	$query = 'ROLLBACK TO SAVEPOINT '.$savepoint;
	return $this->_doQuery($query, true);
	}

	$query = 'ROLLBACK';
	$result =& $this->_doQuery($query, true);
	if (PEAR::isError($result)) {
	return $result;
	}
	if (!$this->start_transaction) {
	$query = 'SET AUTOCOMMIT = 0';
	$result =& $this->_doQuery($query, true);
	if (PEAR::isError($result)) {
	return $result;
	}
	}
	$this->in_transaction = false;
	return MDB2_OK;
	}

	// }}}
	// {{{ function setTransactionIsolation()

	/**
	* Set the transacton isolation level.
	*
	* @param string standard isolation level
	* READ UNCOMMITTED (allows dirty reads)
	* READ COMMITTED (prevents dirty reads)
	* REPEATABLE READ (prevents nonrepeatable reads)
	* SERIALIZABLE (prevents phantom reads)
	* @return mixed MDB2_OK on success, a MDB2 error on failure
	*
	* @access public
	* @since 2.1.1
	*/
	function setTransactionIsolation($isolation)
	{
	$this->debug('Setting transaction isolation level', __FUNCTION__, array('is_manip' => true));
	if (!$this->supports('transactions')) {
	return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
	'transactions are not supported', __FUNCTION__);
	}
	switch ($isolation) {
	case 'READ UNCOMMITTED':
	case 'READ COMMITTED':
	case 'REPEATABLE READ':
	case 'SERIALIZABLE':
	break;
	default:
	return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
	'isolation level is not supported: '.$isolation, __FUNCTION__);
	}

	$query = "SET SESSION TRANSACTION ISOLATION LEVEL $isolation";
	return $this->_doQuery($query, true);
	}

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

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

	$connection = @mysqli_init();
	if (!empty($this->dsn['charset']) && defined('MYSQLI_SET_CHARSET_NAME')) {
	@mysqli_options($connection, MYSQLI_SET_CHARSET_NAME, $this->dsn['charset']);
	}

	if ($this->options['ssl']) {
	@mysqli_ssl_set(
	$connection,
	empty($this->dsn['key']) ? null : $this->dsn['key'],
	empty($this->dsn['cert']) ? null : $this->dsn['cert'],
	empty($this->dsn['ca']) ? null : $this->dsn['ca'],
	empty($this->dsn['capath']) ? null : $this->dsn['capath'],
	empty($this->dsn['cipher']) ? null : $this->dsn['cipher']
	);
	}

	if (!@mysqli_real_connect(
	$connection,
	$this->dsn['hostspec'],
	$username,
	$password,
	$this->database_name,
	$this->dsn['port'],
	$this->dsn['socket']
	)) {
	if (($err = @mysqli_connect_error()) != '') {
	return $this->raiseError(null,
	null, null, $err, __FUNCTION__);
	} else {
	return $this->raiseError(MDB2_ERROR_CONNECT_FAILED, null, null,
	'unable to establish a connection', __FUNCTION__);
	}
	}

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

	return $connection;
	}

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

	/**
	* Connect to the database
	*
	* @return true on success, MDB2 Error Object on failure
	*/
	function connect()
	{
	if (is_object($this->connection)) {
	//if (count(array_diff($this->connected_dsn, $this->dsn)) == 0) {
	if (MDB2::areEquals($this->connected_dsn, $this->dsn)) {
	return MDB2_OK;
	}
	$this->connection = 0;
	}

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

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

	$this->_getServerCapabilities();

	return MDB2_OK;
	}

	// }}}
	// {{{ setCharset()

	/**
	* Set the charset on the current connection
	*
	* @param string charset (or array(charset, collation))
	* @param resource connection handle
	*
	* @return true on success, MDB2 Error Object on failure
	*/
	function setCharset($charset, $connection = null)
	{
	if (is_null($connection)) {
	$connection = $this->getConnection();
	if (PEAR::isError($connection)) {
	return $connection;
	}
	}
	$collation = null;
	if (is_array($charset) && 2 == count($charset)) {
	$collation = array_pop($charset);
	$charset = array_pop($charset);
	}
	$client_info = mysqli_get_client_version();
	if (OS_WINDOWS && ((40111 > $client_info) \|\|
	((50000 <= $client_info) && (50006 > $client_info)))
	) {
	$query = "SET NAMES '".mysqli_real_escape_string($connection, $charset)."'";
	if (!is_null($collation)) {
	$query .= " COLLATE '".mysqli_real_escape_string($connection, $collation)."'";
	}
	return $this->_doQuery($query, true, $connection);
	}
	if (!$result = mysqli_set_charset($connection, $charset)) {
	$err =& $this->raiseError(null, null, null,
	'Could not set client character set', __FUNCTION__);
	return $err;
	}
	return $result;
	}

	// }}}
	// {{{ 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'],
	$this->dsn['password']);
	if (PEAR::isError($connection)) {
	return $connection;
	}

	$result = @mysqli_select_db($connection, $name);
	@mysqli_close($connection);

	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_object($this->connection)) {
	if ($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 ($force) {
	@mysqli_close($this->connection);
	}
	}
	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, $pass);
	if (PEAR::isError($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);
	}

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

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

	if ($this->options['multi_query']) {
	$result = mysqli_multi_query($connection, $query);
	} else {
	$resultmode = $this->options['result_buffering'] ? MYSQLI_USE_RESULT : MYSQLI_USE_RESULT;
	$result = mysqli_query($connection, $query);
	}

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

	if ($this->options['multi_query']) {
	if ($this->options['result_buffering']) {
	if (!($result = @mysqli_store_result($connection))) {
	$err =& $this->raiseError(null, null, null,
	'Could not get the first result from a multi query', __FUNCTION__);
	return $err;
	}
	} elseif (!($result = @mysqli_use_result($connection))) {
	$err =& $this->raiseError(null, null, null,
	'Could not get the first result from a multi query', __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, $result = null)
	{
	if (is_null($connection)) {
	$connection = $this->getConnection();
	if (PEAR::isError($connection)) {
	return $connection;
	}
	}
	return @mysqli_affected_rows($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, $offset)
	{
	if ($this->options['portability'] & MDB2_PORTABILITY_DELETE_COUNT) {
	// "DELETE FROM table" gives 0 affected rows in MySQL.
	// This little hack lets you know how many rows were deleted.
	if (preg_match('/^\sDELETE\s+FROM\s+(\S+)\s$/i', $query)) {
	$query = preg_replace('/^\sDELETE\s+FROM\s+(\S+)\s$/',
	'DELETE FROM \1 WHERE 1=1', $query);
	}
	}
	if ($limit > 0
	&& !preg_match('/LIMIT\s\d(?:\s(?:,\|OFFSET)\s\d+)?(?:[^\)])?$/i', $query)
	) {
	$query = rtrim($query);
	if (substr($query, -1) == ';') {
	$query = substr($query, 0, -1);
	}

	// LIMIT doesn't always come last in the query
	// @see http://dev.mysql.com/doc/refman/5.0/en/select.html
	$after = '';
	if (preg_match('/(\s+INTO\s+(?:OUT\|DUMP)FILE\s.*)$/ims', $query, $matches)) {
	$after = $matches[0];
	$query = preg_replace('/(\s+INTO\s+(?:OUT\|DUMP)FILE\s.*)$/ims', '', $query);
	} elseif (preg_match('/(\s+FOR\s+UPDATE\s*)$/i', $query, $matches)) {
	$after = $matches[0];
	$query = preg_replace('/(\s+FOR\s+UPDATE\s*)$/im', '', $query);
	} elseif (preg_match('/(\s+LOCK\s+IN\s+SHARE\s+MODE\s*)$/im', $query, $matches)) {
	$after = $matches[0];
	$query = preg_replace('/(\s+LOCK\s+IN\s+SHARE\s+MODE\s*)$/im', '', $query);
	}

	if ($is_manip) {
	return $query . " LIMIT $limit" . $after;
	} else {
	return $query . " LIMIT $offset, $limit" . $after;
	}
	}
	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)
	{
	$connection = $this->getConnection();
	if (PEAR::isError($connection)) {
	return $connection;
	}
	if ($this->connected_server_info) {
	$server_info = $this->connected_server_info;
	} else {
	$server_info = @mysqli_get_server_info($connection);
	}
	if (!$server_info) {
	return $this->raiseError(null, null, null,
	'Could not get server information', __FUNCTION__);
	}
	// cache server_info
	$this->connected_server_info = $server_info;
	if (!$native) {
	$tmp = explode('.', $server_info, 3);
	if (isset($tmp[2]) && strpos($tmp[2], '-')) {
	$tmp2 = explode('-', @$tmp[2], 2);
	} else {
	$tmp2[0] = isset($tmp[2]) ? $tmp[2] : null;
	$tmp2[1] = null;
	}
	$server_info = array(
	'major' => isset($tmp[0]) ? $tmp[0] : null,
	'minor' => isset($tmp[1]) ? $tmp[1] : null,
	'patch' => $tmp2[0],
	'extra' => $tmp2[1],
	'native' => $server_info,
	);
	}
	return $server_info;
	}

	// }}}
	// {{{ _getServerCapabilities()

	/**
	* Fetch some information about the server capabilities
	* (transactions, subselects, prepared statements, etc).
	*
	* @access private
	*/
	function _getServerCapabilities()
	{
	if (!$this->server_capabilities_checked) {
	$this->server_capabilities_checked = true;

	//set defaults
	$this->supported['sub_selects'] = 'emulated';
	$this->supported['prepared_statements'] = 'emulated';
	$this->supported['triggers'] = false;
	$this->start_transaction = false;
	$this->varchar_max_length = 255;

	$server_info = $this->getServerVersion();
	if (is_array($server_info)) {
	$server_version = $server_info['major'].'.'.$server_info['minor'].'.'.$server_info['patch'];

	if (!version_compare($server_version, '4.1.0', '<')) {
	$this->supported['sub_selects'] = true;
	$this->supported['prepared_statements'] = true;
	}

	// SAVEPOINTS were introduced in MySQL 4.0.14 and 4.1.1 (InnoDB)
	if (version_compare($server_version, '4.1.0', '>=')) {
	if (version_compare($server_version, '4.1.1', '<')) {
	$this->supported['savepoints'] = false;
	}
	} elseif (version_compare($server_version, '4.0.14', '<')) {
	$this->supported['savepoints'] = false;
	}

	if (!version_compare($server_version, '4.0.11', '<')) {
	$this->start_transaction = true;
	}

	if (!version_compare($server_version, '5.0.3', '<')) {
	$this->varchar_max_length = 65532;
	}

	if (!version_compare($server_version, '5.0.2', '<')) {
	$this->supported['triggers'] = true;
	}
	}
	}
	}

	// }}}
	// {{{ function _skipUserDefinedVariable($query, $position)

	/**
	* Utility method, used by prepare() to avoid misinterpreting MySQL user
	* defined variables (SELECT @x:=5) for placeholders.
	* Check if the placeholder is a false positive, i.e. if it is an user defined
	* variable instead. If so, skip it and advance the position, otherwise
	* return the current position, which is valid
	*
	* @param string $query
	* @param integer $position current string cursor position
	* @return integer $new_position
	* @access protected
	*/
	function _skipUserDefinedVariable($query, $position)
	{
	$found = strpos(strrev(substr($query, 0, $position)), '@');
	if ($found === false) {
	return $position;
	}
	$pos = strlen($query) - strlen(substr($query, $position)) - $found - 1;
	$substring = substr($query, $pos, $position - $pos + 2);
	if (preg_match('/^@\w+\s*:=$/', $substring)) {
	return $position + 1; //found an user defined variable: skip it
	}
	return $position;
	}

	// }}}
	// {{{ prepare()

	/**
	* Prepares a query for multiple execution with execute().
	* With some database backends, this is emulated.
	* prepare() requires a generic query as string like
	* 'INSERT INTO numbers VALUES(?,?)' or
	* 'INSERT INTO numbers VALUES(:foo,:bar)'.
	* The ? and :name and are placeholders which can be set using
	* bindParam() and the query can be sent off using the execute() method.
	* The allowed format for :name can be set with the 'bindname_format' option.
	*
	* @param string $query the query to prepare
	* @param mixed $types array that contains the types of the placeholders
	* @param mixed $result_types array that contains the types of the columns in
	* the result set or MDB2_PREPARE_RESULT, if set to
	* MDB2_PREPARE_MANIP the query is handled as a manipulation query
	* @param mixed $lobs key (field) value (parameter) pair for all lob placeholders
	* @return mixed resource handle for the prepared query on success, a MDB2
	* error on failure
	* @access public
	* @see bindParam, execute
	*/
	function &prepare($query, $types = null, $result_types = null, $lobs = array())
	{
	if ($this->options['emulate_prepared']
	\|\| $this->supported['prepared_statements'] !== true
	) {
	$obj =& parent::prepare($query, $types, $result_types, $lobs);
	return $obj;
	}
	$is_manip = ($result_types === MDB2_PREPARE_MANIP);
	$offset = $this->offset;
	$limit = $this->limit;
	$this->offset = $this->limit = 0;
	$query = $this->_modifyQuery($query, $is_manip, $limit, $offset);
	$result = $this->debug($query, __FUNCTION__, array('is_manip' => $is_manip, 'when' => 'pre'));
	if ($result) {
	if (PEAR::isError($result)) {
	return $result;
	}
	$query = $result;
	}
	$placeholder_type_guess = $placeholder_type = null;
	$question = '?';
	$colon = ':';
	$positions = array();
	$position = 0;
	while ($position < strlen($query)) {
	$q_position = strpos($query, $question, $position);
	$c_position = strpos($query, $colon, $position);
	if ($q_position && $c_position) {
	$p_position = min($q_position, $c_position);
	} elseif ($q_position) {
	$p_position = $q_position;
	} elseif ($c_position) {
	$p_position = $c_position;
	} else {
	break;
	}
	if (is_null($placeholder_type)) {
	$placeholder_type_guess = $query[$p_position];
	}

	$new_pos = $this->_skipDelimitedStrings($query, $position, $p_position);
	if (PEAR::isError($new_pos)) {
	return $new_pos;
	}
	if ($new_pos != $position) {
	$position = $new_pos;
	continue; //evaluate again starting from the new position
	}

	//make sure this is not part of an user defined variable
	$new_pos = $this->_skipUserDefinedVariable($query, $position);
	if ($new_pos != $position) {
	$position = $new_pos;
	continue; //evaluate again starting from the new position
	}

	if ($query[$position] == $placeholder_type_guess) {
	if (is_null($placeholder_type)) {
	$placeholder_type = $query[$p_position];
	$question = $colon = $placeholder_type;
	}
	if ($placeholder_type == ':') {
	$regexp = '/^.{'.($position+1).'}('.$this->options['bindname_format'].').*$/s';
	$parameter = preg_replace($regexp, '\\1', $query);
	if ($parameter === '') {
	$err =& $this->raiseError(MDB2_ERROR_SYNTAX, null, null,
	'named parameter name must match "bindname_format" option', __FUNCTION__);
	return $err;
	}
	$positions[$p_position] = $parameter;
	$query = substr_replace($query, '?', $position, strlen($parameter)+1);
	} else {
	$positions[$p_position] = count($positions);
	}
	$position = $p_position + 1;
	} else {
	$position = $p_position;
	}
	}
	$connection = $this->getConnection();
	if (PEAR::isError($connection)) {
	return $connection;
	}

	if (!$is_manip) {
	static $prep_statement_counter = 1;
	$statement_name = sprintf($this->options['statement_format'], $this->phptype, $prep_statement_counter++ . sha1(microtime() + mt_rand()));
	$statement_name = substr(strtolower($statement_name), 0, $this->options['max_identifiers_length']);
	$query = "PREPARE $statement_name FROM ".$this->quote($query, 'text');

	$statement =& $this->_doQuery($query, true, $connection);
	if (PEAR::isError($statement)) {
	return $statement;
	}
	$statement = $statement_name;
	} else {
	$statement = @mysqli_prepare($connection, $query);
	if (!$statement) {
	$err =& $this->raiseError(null, null, null,
	'Unable to create prepared statement handle', __FUNCTION__);
	return $err;
	}
	}

	$class_name = 'MDB2_Statement_'.$this->phptype;
	$obj = new $class_name($this, $statement, $positions, $query, $types, $result_types, $is_manip, $limit, $offset);
	$this->debug($query, __FUNCTION__, array('is_manip' => $is_manip, 'when' => 'post', 'result' => $obj));
	return $obj;
	}

	// }}}
	// {{{ replace()

	/**
	* Execute a SQL REPLACE query. A REPLACE query is identical to a INSERT
	* query, except that if there is already a row in the table with the same
	* key field values, the REPLACE query just updates its values instead of
	* inserting a new row.
	*
	* The REPLACE type of query does not make part of the SQL standards. Since
	* practically only MySQL implements it natively, this type of query is
	* emulated through this method for other DBMS using standard types of
	* queries inside a transaction to assure the atomicity of the operation.
	*
	* @access public
	*
	* @param string $table name of the table on which the REPLACE query will
	* be executed.
	* @param array $fields associative array that describes the fields and the
	* values that will be inserted or updated in the specified table. The
	* indexes of the array are the names of all the fields of the table. The
	* values of the array are also associative arrays that describe the
	* values and other properties of the table fields.
	*
	* Here follows a list of field properties that need to be specified:
	*
	* value:
	* Value to be assigned to the specified field. This value may be
	* of specified in database independent type format as this
	* function can perform the necessary datatype conversions.
	*
	* Default:
	* this property is required unless the Null property
	* is set to 1.
	*
	* type
	* Name of the type of the field. Currently, all types Metabase
	* are supported except for clob and blob.
	*
	* Default: no type conversion
	*
	* null
	* Boolean property that indicates that the value for this field
	* should be set to null.
	*
	* The default value for fields missing in INSERT queries may be
	* specified the definition of a table. Often, the default value
	* is already null, but since the REPLACE may be emulated using
	* an UPDATE query, make sure that all fields of the table are
	* listed in this function argument array.
	*
	* Default: 0
	*
	* key
	* Boolean property that indicates that this field should be
	* handled as a primary key or at least as part of the compound
	* unique index of the table that will determine the row that will
	* updated if it exists or inserted a new row otherwise.
	*
	* This function will fail if no key field is specified or if the
	* value of a key field is set to null because fields that are
	* part of unique index they may not be null.
	*
	* Default: 0
	*
	* @return mixed MDB2_OK on success, a MDB2 error on failure
	*/
	function replace($table, $fields)
	{
	$count = count($fields);
	$query = $values = '';
	$keys = $colnum = 0;
	for (reset($fields); $colnum < $count; next($fields), $colnum++) {
	$name = key($fields);
	if ($colnum > 0) {
	$query .= ',';
	$values.= ',';
	}
	$query.= $this->quoteIdentifier($name, true);
	if (isset($fields[$name]['null']) && $fields[$name]['null']) {
	$value = 'NULL';
	} else {
	$type = isset($fields[$name]['type']) ? $fields[$name]['type'] : null;
	$value = $this->quote($fields[$name]['value'], $type);
	if (PEAR::isError($value)) {
	return $value;
	}
	}
	$values.= $value;
	if (isset($fields[$name]['key']) && $fields[$name]['key']) {
	if ($value === 'NULL') {
	return $this->raiseError(MDB2_ERROR_CANNOT_REPLACE, null, null,
	'key value '.$name.' may not be NULL', __FUNCTION__);
	}
	$keys++;
	}
	}
	if ($keys == 0) {
	return $this->raiseError(MDB2_ERROR_CANNOT_REPLACE, null, null,
	'not specified which fields are keys', __FUNCTION__);
	}

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

	$table = $this->quoteIdentifier($table, true);
	$query = "REPLACE INTO $table ($query) VALUES ($values)";
	$result =& $this->_doQuery($query, true, $connection);
	if (PEAR::isError($result)) {
	return $result;
	}
	return $this->_affectedRows($connection, $result);
	}

	// }}}
	// {{{ 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);
	$query = "INSERT INTO $sequence_name ($seqcol_name) VALUES (NULL)";
	$this->pushErrorHandling(PEAR_ERROR_RETURN);
	$this->expectError(MDB2_ERROR_NOSUCHTABLE);
	$result =& $this->_doQuery($query, true);
	$this->popExpect();
	$this->popErrorHandling();
	if (PEAR::isError($result)) {
	if ($ondemand && $result->getCode() == MDB2_ERROR_NOSUCHTABLE) {
	$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 {
	return $this->nextID($seq_name, false);
	}
	}
	return $result;
	}
	$value = $this->lastInsertID();
	if (is_numeric($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)
	{
	// not using mysql_insert_id() due to http://pear.php.net/bugs/bug.php?id=8051
	return $this->queryOne('SELECT LAST_INSERT_ID()', 'integer');
	}

	// }}}
	// {{{ currID()

	/**
	* Returns the current id of a sequence
	*
	* @param string $seq_name name of the sequence
	* @return mixed MDB2 Error Object or id
	* @access public
	*/
	function currID($seq_name)
	{
	$sequence_name = $this->quoteIdentifier($this->getSequenceName($seq_name), true);
	$seqcol_name = $this->quoteIdentifier($this->options['seqcol_name'], true);
	$query = "SELECT MAX($seqcol_name) FROM $sequence_name";
	return $this->queryOne($query, 'integer');
	}
	}

	/**
	* MDB2 MySQLi result driver
	*
	* @package MDB2
	* @category Database
	* @author Lukas Smith <smith@pooteeweet.org>
	*/
	class MDB2_Result_mysqli extends MDB2_Result_Common
	{
	// }}}
	// {{{ 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, $rownum = null)
	{
	if (!is_null($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) {
	$row = @mysqli_fetch_assoc($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 {
	$row = @mysqli_fetch_row($this->result);
	}

	if (!$row) {
	if ($this->result === false) {
	$err =& $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
	'resultset has already been freed', __FUNCTION__);
	return $err;
	}
	$null = null;
	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 {
	$row = &new $object_class($row);
	}
	}
	++$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++) {
	$column_info = @mysqli_fetch_field_direct($this->result, $column);
	$columns[$column_info->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()
	{
	$cols = @mysqli_num_fields($this->result);
	if (is_null($cols)) {
	if ($this->result === false) {
	return $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
	'resultset has already been freed', __FUNCTION__);
	} elseif (is_null($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()
	{
	$connection = $this->db->getConnection();
	if (PEAR::isError($connection)) {
	return $connection;
	}

	if (!@mysqli_more_results($connection)) {
	return false;
	}
	if (!@mysqli_next_result($connection)) {
	return false;
	}
	if (!($this->result = @mysqli_use_result($connection))) {
	return false;
	}
	return MDB2_OK;
	}

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

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

	/**
	* MDB2 MySQLi buffered result driver
	*
	* @package MDB2
	* @category Database
	* @author Lukas Smith <smith@pooteeweet.org>
	*/
	class MDB2_BufferedResult_mysqli extends MDB2_Result_mysqli
	{
	// }}}
	// {{{ 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) && !@mysqli_data_seek($this->result, $rownum)) {
	if ($this->result === false) {
	return $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
	'resultset has already been freed', __FUNCTION__);
	} elseif (is_null($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()
	{
	$rows = @mysqli_num_rows($this->result);
	if (is_null($rows)) {
	if ($this->result === false) {
	return $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
	'resultset has already been freed', __FUNCTION__);
	} elseif (is_null($this->result)) {
	return 0;
	}
	return $this->db->raiseError(null, null, null,
	'Could not get row count', __FUNCTION__);
	}
	return $rows;
	}

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

	/**
	* Move the internal result pointer to the next available result
	*
	* @param a valid result resource
	* @return true on success, false if there is no more result set or an error object on failure
	* @access public
	*/
	function nextResult()
	{
	$connection = $this->db->getConnection();
	if (PEAR::isError($connection)) {
	return $connection;
	}

	if (!@mysqli_more_results($connection)) {
	return false;
	}
	if (!@mysqli_next_result($connection)) {
	return false;
	}
	if (!($this->result = @mysqli_store_result($connection))) {
	return false;
	}
	return MDB2_OK;
	}
	}

	/**
	* MDB2 MySQLi statement driver
	*
	* @package MDB2
	* @category Database
	* @author Lukas Smith <smith@pooteeweet.org>
	*/
	class MDB2_Statement_mysqli extends MDB2_Statement_Common
	{
	// {{{ _execute()

	/**
	* Execute a prepared query statement helper method.
	*
	* @param mixed $result_class string which specifies which result class to use
	* @param mixed $result_wrap_class string which specifies which class to wrap results in
	* @return mixed a result handle or MDB2_OK on success, a MDB2 error on failure
	* @access private
	*/
	function &_execute($result_class = true, $result_wrap_class = false)
	{
	if (is_null($this->statement)) {
	$result =& parent::_execute($result_class, $result_wrap_class);
	return $result;
	}
	$this->db->last_query = $this->query;
	$this->db->debug($this->query, 'execute', array('is_manip' => $this->is_manip, 'when' => 'pre', 'parameters' => $this->values));
	if ($this->db->getOption('disable_query')) {
	$result = $this->is_manip ? 0 : null;
	return $result;
	}

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

	if (!is_object($this->statement)) {
	$query = 'EXECUTE '.$this->statement;
	}
	if (!empty($this->positions)) {
	$parameters = array(0 => $this->statement, 1 => '');
	$lobs = array();
	$i = 0;
	foreach ($this->positions as $parameter) {
	if (!array_key_exists($parameter, $this->values)) {
	return $this->db->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
	'Unable to bind to missing placeholder: '.$parameter, __FUNCTION__);
	}
	$value = $this->values[$parameter];
	$type = array_key_exists($parameter, $this->types) ? $this->types[$parameter] : null;
	if (!is_object($this->statement)) {
	if (is_resource($value) \|\| $type == 'clob' \|\| $type == 'blob' && $this->db->options['lob_allow_url_include']) {
	if (!is_resource($value) && preg_match('/^(\w+:\/\/)(.*)$/', $value, $match)) {
	if ($match[1] == 'file://') {
	$value = $match[2];
	}
	$value = @fopen($value, 'r');
	$close = true;
	}
	if (is_resource($value)) {
	$data = '';
	while (!@feof($value)) {
	$data.= @fread($value, $this->db->options['lob_buffer_length']);
	}
	if ($close) {
	@fclose($value);
	}
	$value = $data;
	}
	}
	$quoted = $this->db->quote($value, $type);
	if (PEAR::isError($quoted)) {
	return $quoted;
	}
	$param_query = 'SET @'.$parameter.' = '.$quoted;
	$result = $this->db->_doQuery($param_query, true, $connection);
	if (PEAR::isError($result)) {
	return $result;
	}
	} else {
	if (is_resource($value) \|\| $type == 'clob' \|\| $type == 'blob') {
	$parameters[] = null;
	$parameters[1].= 'b';
	$lobs[$i] = $parameter;
	} else {
	$quoted = $this->db->quote($value, $type, false);
	if (PEAR::isError($quoted)) {
	return $quoted;
	}
	$parameters[] = $quoted;
	$parameters[1].= $this->db->datatype->mapPrepareDatatype($type);
	}
	++$i;
	}
	}

	if (!is_object($this->statement)) {
	$query.= ' USING @'.implode(', @', array_values($this->positions));
	} else {
	$result = @call_user_func_array('mysqli_stmt_bind_param', $parameters);
	if ($result === false) {
	$err =& $this->db->raiseError(null, null, null,
	'Unable to bind parameters', __FUNCTION__);
	return $err;
	}

	foreach ($lobs as $i => $parameter) {
	$value = $this->values[$parameter];
	$close = false;
	if (!is_resource($value)) {
	$close = true;
	if (preg_match('/^(\w+:\/\/)(.*)$/', $value, $match)) {
	if ($match[1] == 'file://') {
	$value = $match[2];
	}
	$value = @fopen($value, 'r');
	} else {
	$fp = @tmpfile();
	@fwrite($fp, $value);
	@rewind($fp);
	$value = $fp;
	}
	}
	while (!@feof($value)) {
	$data = @fread($value, $this->db->options['lob_buffer_length']);
	@mysqli_stmt_send_long_data($this->statement, $i, $data);
	}
	if ($close) {
	@fclose($value);
	}
	}
	}
	}

	if (!is_object($this->statement)) {
	$result = $this->db->_doQuery($query, $this->is_manip, $connection);
	if (PEAR::isError($result)) {
	return $result;
	}

	if ($this->is_manip) {
	$affected_rows = $this->db->_affectedRows($connection, $result);
	return $affected_rows;
	}

	$result =& $this->db->_wrapResult($result, $this->result_types,
	$result_class, $result_wrap_class, $this->limit, $this->offset);
	} else {
	if (!@mysqli_stmt_execute($this->statement)) {
	$err =& $this->db->raiseError(null, null, null,
	'Unable to execute statement', __FUNCTION__);
	return $err;
	}

	if ($this->is_manip) {
	$affected_rows = @mysqli_stmt_affected_rows($this->statement);
	return $affected_rows;
	}

	if ($this->db->options['result_buffering']) {
	@mysqli_stmt_store_result($this->statement);
	}

	$result =& $this->db->_wrapResult($this->statement, $this->result_types,
	$result_class, $result_wrap_class, $this->limit, $this->offset);
	}

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

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

	/**
	* Release resources allocated for the specified prepared query.
	*
	* @return mixed MDB2_OK on success, a MDB2 error on failure
	* @access public
	*/
	function free()
	{
	if (is_null($this->positions)) {
	return $this->db->raiseError(MDB2_ERROR, null, null,
	'Prepared statement has already been freed', __FUNCTION__);
	}
	$result = MDB2_OK;

	if (is_object($this->statement)) {
	if (!@mysqli_stmt_close($this->statement)) {
	$result = $this->db->raiseError(null, null, null,
	'Could not free statement', __FUNCTION__);
	}
	} elseif (!is_null($this->statement)) {
	$connection = $this->db->getConnection();
	if (PEAR::isError($connection)) {
	return $connection;
	}

	$query = 'DEALLOCATE PREPARE '.$this->statement;
	$result = $this->db->_doQuery($query, true, $connection);
	}

	parent::free();
	return $result;
	}
	}
	?>

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