mysqli.php
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mysqli.php
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	<?php

	/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

	/**
	* The PEAR DB driver for PHP's mysqli extension
	* for interacting with MySQL databases
	*
	* PHP versions 4 and 5
	*
	* LICENSE: This source file is subject to version 3.0 of the PHP license
	* that is available through the world-wide-web at the following URI:
	* http://www.php.net/license/3_0.txt. If you did not receive a copy of
	* the PHP License and are unable to obtain it through the web, please
	* send a note to license@php.net so we can mail you a copy immediately.
	*
	* @category Database
	* @package DB
	* @author Daniel Convissor <danielc@php.net>
	* @copyright 1997-2005 The PHP Group
	* @license http://www.php.net/license/3_0.txt PHP License 3.0
	* @version CVS: $Id$
	* @link http://pear.php.net/package/DB
	*/

	/**
	* Obtain the DB_common class so it can be extended from
	*/
	require_once 'DB/common.php';

	/**
	* The methods PEAR DB uses to interact with PHP's mysqli extension
	* for interacting with MySQL databases
	*
	* This is for MySQL versions 4.1 and above. Requires PHP 5.
	*
	* Note that persistent connections no longer exist.
	*
	* These methods overload the ones declared in DB_common.
	*
	* @category Database
	* @package DB
	* @author Daniel Convissor <danielc@php.net>
	* @copyright 1997-2005 The PHP Group
	* @license http://www.php.net/license/3_0.txt PHP License 3.0
	* @version Release: @package_version@
	* @link http://pear.php.net/package/DB
	* @since Class functional since Release 1.6.3
	*/
	class DB_mysqli extends DB_common
	{
	// {{{ properties

	/**
	* The DB driver type (mysql, oci8, odbc, etc.)
	* @var string
	*/
	var $phptype = 'mysqli';

	/**
	* The database syntax variant to be used (db2, access, etc.), if any
	* @var string
	*/
	var $dbsyntax = 'mysqli';

	/**
	* The capabilities of this DB implementation
	*
	* The 'new_link' element contains the PHP version that first provided
	* new_link support for this DBMS. Contains false if it's unsupported.
	*
	* Meaning of the 'limit' element:
	* + 'emulate' = emulate with fetch row by number
	* + 'alter' = alter the query
	* + false = skip rows
	*
	* @var array
	*/
	var $features = array(
	'limit' => 'alter',
	'new_link' => false,
	'numrows' => true,
	'pconnect' => false,
	'prepare' => false,
	'ssl' => true,
	'transactions' => true,
	);

	/**
	* A mapping of native error codes to DB error codes
	* @var array
	*/
	var $errorcode_map = array(
	1004 => DB_ERROR_CANNOT_CREATE,
	1005 => DB_ERROR_CANNOT_CREATE,
	1006 => DB_ERROR_CANNOT_CREATE,
	1007 => DB_ERROR_ALREADY_EXISTS,
	1008 => DB_ERROR_CANNOT_DROP,
	1022 => DB_ERROR_ALREADY_EXISTS,
	1044 => DB_ERROR_ACCESS_VIOLATION,
	1046 => DB_ERROR_NODBSELECTED,
	1048 => DB_ERROR_CONSTRAINT,
	1049 => DB_ERROR_NOSUCHDB,
	1050 => DB_ERROR_ALREADY_EXISTS,
	1051 => DB_ERROR_NOSUCHTABLE,
	1054 => DB_ERROR_NOSUCHFIELD,
	1061 => DB_ERROR_ALREADY_EXISTS,
	1062 => DB_ERROR_ALREADY_EXISTS,
	1064 => DB_ERROR_SYNTAX,
	1091 => DB_ERROR_NOT_FOUND,
	1100 => DB_ERROR_NOT_LOCKED,
	1136 => DB_ERROR_VALUE_COUNT_ON_ROW,
	1142 => DB_ERROR_ACCESS_VIOLATION,
	1146 => DB_ERROR_NOSUCHTABLE,
	1216 => DB_ERROR_CONSTRAINT,
	1217 => DB_ERROR_CONSTRAINT,
	);

	/**
	* The raw database connection created by PHP
	* @var resource
	*/
	var $connection;

	/**
	* The DSN information for connecting to a database
	* @var array
	*/
	var $dsn = array();


	/**
	* Should data manipulation queries be committed automatically?
	* @var bool
	* @access private
	*/
	var $autocommit = true;

	/**
	* The quantity of transactions begun
	*
	* {@internal While this is private, it can't actually be designated
	* private in PHP 5 because it is directly accessed in the test suite.}}
	*
	* @var integer
	* @access private
	*/
	var $transaction_opcount = 0;

	/**
	* The database specified in the DSN
	*
	* It's a fix to allow calls to different databases in the same script.
	*
	* @var string
	* @access private
	*/
	var $_db = '';

	/**
	* Array for converting MYSQLI_*_FLAG constants to text values
	* @var array
	* @access public
	* @since Property available since Release 1.6.5
	*/
	var $mysqli_flags = array(
	MYSQLI_NOT_NULL_FLAG => 'not_null',
	MYSQLI_PRI_KEY_FLAG => 'primary_key',
	MYSQLI_UNIQUE_KEY_FLAG => 'unique_key',
	MYSQLI_MULTIPLE_KEY_FLAG => 'multiple_key',
	MYSQLI_BLOB_FLAG => 'blob',
	MYSQLI_UNSIGNED_FLAG => 'unsigned',
	MYSQLI_ZEROFILL_FLAG => 'zerofill',
	MYSQLI_AUTO_INCREMENT_FLAG => 'auto_increment',
	MYSQLI_TIMESTAMP_FLAG => 'timestamp',
	MYSQLI_SET_FLAG => 'set',
	// MYSQLI_NUM_FLAG => 'numeric', // unnecessary
	// MYSQLI_PART_KEY_FLAG => 'multiple_key', // duplicatvie
	MYSQLI_GROUP_FLAG => 'group_by'
	);

	/**
	* Array for converting MYSQLI_TYPE_* constants to text values
	* @var array
	* @access public
	* @since Property available since Release 1.6.5
	*/
	var $mysqli_types = array(
	MYSQLI_TYPE_DECIMAL => 'decimal',
	MYSQLI_TYPE_TINY => 'tinyint',
	MYSQLI_TYPE_SHORT => 'int',
	MYSQLI_TYPE_LONG => 'int',
	MYSQLI_TYPE_FLOAT => 'float',
	MYSQLI_TYPE_DOUBLE => 'double',
	// MYSQLI_TYPE_NULL => 'DEFAULT NULL', // let flags handle it
	MYSQLI_TYPE_TIMESTAMP => 'timestamp',
	MYSQLI_TYPE_LONGLONG => 'bigint',
	MYSQLI_TYPE_INT24 => 'mediumint',
	MYSQLI_TYPE_DATE => 'date',
	MYSQLI_TYPE_TIME => 'time',
	MYSQLI_TYPE_DATETIME => 'datetime',
	MYSQLI_TYPE_YEAR => 'year',
	MYSQLI_TYPE_NEWDATE => 'date',
	MYSQLI_TYPE_ENUM => 'enum',
	MYSQLI_TYPE_SET => 'set',
	MYSQLI_TYPE_TINY_BLOB => 'tinyblob',
	MYSQLI_TYPE_MEDIUM_BLOB => 'mediumblob',
	MYSQLI_TYPE_LONG_BLOB => 'longblob',
	MYSQLI_TYPE_BLOB => 'blob',
	MYSQLI_TYPE_VAR_STRING => 'varchar',
	MYSQLI_TYPE_STRING => 'char',
	MYSQLI_TYPE_GEOMETRY => 'geometry',
	);


	// }}}
	// {{{ constructor

	/**
	* This constructor calls <kbd>$this->DB_common()</kbd>
	*
	* @return void
	*/
	function DB_mysqli()
	{
	$this->DB_common();
	}

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

	/**
	* Connect to the database server, log in and open the database
	*
	* Don't call this method directly. Use DB::connect() instead.
	*
	* PEAR DB's mysqli driver supports the following extra DSN options:
	* + When the 'ssl' $option passed to DB::connect() is true:
	* + key The path to the key file.
	* + cert The path to the certificate file.
	* + ca The path to the certificate authority file.
	* + capath The path to a directory that contains trusted SSL
	* CA certificates in pem format.
	* + cipher The list of allowable ciphers for SSL encryption.
	*
	* Example of how to connect using SSL:
	* <code>
	* require_once 'DB.php';
	*
	* $dsn = array(
	* 'phptype' => 'mysqli',
	* 'username' => 'someuser',
	* 'password' => 'apasswd',
	* 'hostspec' => 'localhost',
	* 'database' => 'thedb',
	* 'key' => 'client-key.pem',
	* 'cert' => 'client-cert.pem',
	* 'ca' => 'cacert.pem',
	* 'capath' => '/path/to/ca/dir',
	* 'cipher' => 'AES',
	* );
	*
	* $options = array(
	* 'ssl' => true,
	* );
	*
	* $db =& DB::connect($dsn, $options);
	* if (PEAR::isError($db)) {
	* die($db->getMessage());
	* }
	* </code>
	*
	* @param array $dsn the data source name
	* @param bool $persistent should the connection be persistent?
	*
	* @return int DB_OK on success. A DB_Error object on failure.
	*/
	function connect($dsn, $persistent = false)
	{
	if (!PEAR::loadExtension('mysqli')) {
	return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);
	}

	$this->dsn = $dsn;
	if ($dsn['dbsyntax']) {
	$this->dbsyntax = $dsn['dbsyntax'];
	}

	$ini = ini_get('track_errors');
	ini_set('track_errors', 1);
	$php_errormsg = '';

	if ($this->getOption('ssl') === true) {
	$init = mysqli_init();
	mysqli_ssl_set(
	$init,
	empty($dsn['key']) ? null : $dsn['key'],
	empty($dsn['cert']) ? null : $dsn['cert'],
	empty($dsn['ca']) ? null : $dsn['ca'],
	empty($dsn['capath']) ? null : $dsn['capath'],
	empty($dsn['cipher']) ? null : $dsn['cipher']
	);
	if ($this->connection = @mysqli_real_connect(
	$init,
	$dsn['hostspec'],
	$dsn['username'],
	$dsn['password'],
	$dsn['database'],
	$dsn['port'],
	$dsn['socket']))
	{
	$this->connection = $init;
	}
	} else {
	$this->connection = @mysqli_connect(
	$dsn['hostspec'],
	$dsn['username'],
	$dsn['password'],
	$dsn['database'],
	$dsn['port'],
	$dsn['socket']
	);
	}

	ini_set('track_errors', $ini);

	if (!$this->connection) {
	if (($err = @mysqli_connect_error()) != '') {
	return $this->raiseError(DB_ERROR_CONNECT_FAILED,
	null, null, null,
	$err);
	} else {
	return $this->raiseError(DB_ERROR_CONNECT_FAILED,
	null, null, null,
	$php_errormsg);
	}
	}

	if ($dsn['database']) {
	$this->_db = $dsn['database'];
	}

	return DB_OK;
	}

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

	/**
	* Disconnects from the database server
	*
	* @return bool TRUE on success, FALSE on failure
	*/
	function disconnect()
	{
	$ret = @mysqli_close($this->connection);
	$this->connection = null;
	return $ret;
	}

	// }}}
	// {{{ simpleQuery()

	/**
	* Sends a query to the database server
	*
	* @param string the SQL query string
	*
	* @return mixed + a PHP result resrouce for successful SELECT queries
	* + the DB_OK constant for other successful queries
	* + a DB_Error object on failure
	*/
	function simpleQuery($query)
	{
	$ismanip = DB::isManip($query);
	$this->last_query = $query;
	$query = $this->modifyQuery($query);
	if ($this->_db) {
	if (!@mysqli_select_db($this->connection, $this->_db)) {
	return $this->mysqliRaiseError(DB_ERROR_NODBSELECTED);
	}
	}
	if (!$this->autocommit && $ismanip) {
	if ($this->transaction_opcount == 0) {
	$result = @mysqli_query($this->connection, 'SET AUTOCOMMIT=0');
	$result = @mysqli_query($this->connection, 'BEGIN');
	if (!$result) {
	return $this->mysqliRaiseError();
	}
	}
	$this->transaction_opcount++;
	}
	$result = @mysqli_query($this->connection, $query);
	if (!$result) {
	return $this->mysqliRaiseError();
	}
	if (is_object($result)) {
	return $result;
	}
	return DB_OK;
	}

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

	/**
	* Move the internal mysql result pointer to the next available result.
	*
	* This method has not been implemented yet.
	*
	* @param resource $result a valid sql result resource
	* @return false
	* @access public
	*/
	function nextResult($result)
	{
	return false;
	}

	// }}}
	// {{{ fetchInto()

	/**
	* Places a row from the result set into the given array
	*
	* Formating of the array and the data therein are configurable.
	* See DB_result::fetchInto() for more information.
	*
	* This method is not meant to be called directly. Use
	* DB_result::fetchInto() instead. It can't be declared "protected"
	* because DB_result is a separate object.
	*
	* @param resource $result the query result resource
	* @param array $arr the referenced array to put the data in
	* @param int $fetchmode how the resulting array should be indexed
	* @param int $rownum the row number to fetch (0 = first row)
	*
	* @return mixed DB_OK on success, NULL when the end of a result set is
	* reached or on failure
	*
	* @see DB_result::fetchInto()
	*/
	function fetchInto($result, &$arr, $fetchmode, $rownum = null)
	{
	if ($rownum !== null) {
	if (!@mysqli_data_seek($result, $rownum)) {
	return null;
	}
	}
	if ($fetchmode & DB_FETCHMODE_ASSOC) {
	$arr = @mysqli_fetch_array($result, MYSQLI_ASSOC);
	if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE && $arr) {
	$arr = array_change_key_case($arr, CASE_LOWER);
	}
	} else {
	$arr = @mysqli_fetch_row($result);
	}
	if (!$arr) {
	return null;
	}
	if ($this->options['portability'] & DB_PORTABILITY_RTRIM) {
	/*
	* Even though this DBMS already trims output, we do this because
	* a field might have intentional whitespace at the end that
	* gets removed by DB_PORTABILITY_RTRIM under another driver.
	*/
	$this->_rtrimArrayValues($arr);
	}
	if ($this->options['portability'] & DB_PORTABILITY_NULL_TO_EMPTY) {
	$this->_convertNullArrayValuesToEmpty($arr);
	}
	return DB_OK;
	}

	// }}}
	// {{{ freeResult()

	/**
	* Deletes the result set and frees the memory occupied by the result set
	*
	* This method is not meant to be called directly. Use
	* DB_result::free() instead. It can't be declared "protected"
	* because DB_result is a separate object.
	*
	* @param resource $result PHP's query result resource
	*
	* @return bool TRUE on success, FALSE if $result is invalid
	*
	* @see DB_result::free()
	*/
	function freeResult($result)
	{
	return @mysqli_free_result($result);
	}

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

	/**
	* Gets the number of columns in a result set
	*
	* This method is not meant to be called directly. Use
	* DB_result::numCols() instead. It can't be declared "protected"
	* because DB_result is a separate object.
	*
	* @param resource $result PHP's query result resource
	*
	* @return int the number of columns. A DB_Error object on failure.
	*
	* @see DB_result::numCols()
	*/
	function numCols($result)
	{
	$cols = @mysqli_num_fields($result);
	if (!$cols) {
	return $this->mysqliRaiseError();
	}
	return $cols;
	}

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

	/**
	* Gets the number of rows in a result set
	*
	* This method is not meant to be called directly. Use
	* DB_result::numRows() instead. It can't be declared "protected"
	* because DB_result is a separate object.
	*
	* @param resource $result PHP's query result resource
	*
	* @return int the number of rows. A DB_Error object on failure.
	*
	* @see DB_result::numRows()
	*/
	function numRows($result)
	{
	$rows = @mysqli_num_rows($result);
	if ($rows === null) {
	return $this->mysqliRaiseError();
	}
	return $rows;
	}

	// }}}
	// {{{ autoCommit()

	/**
	* Enables or disables automatic commits
	*
	* @param bool $onoff true turns it on, false turns it off
	*
	* @return int DB_OK on success. A DB_Error object if the driver
	* doesn't support auto-committing transactions.
	*/
	function autoCommit($onoff = false)
	{
	// XXX if $this->transaction_opcount > 0, we should probably
	// issue a warning here.
	$this->autocommit = $onoff ? true : false;
	return DB_OK;
	}

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

	/**
	* Commits the current transaction
	*
	* @return int DB_OK on success. A DB_Error object on failure.
	*/
	function commit()
	{
	if ($this->transaction_opcount > 0) {
	if ($this->_db) {
	if (!@mysqli_select_db($this->connection, $this->_db)) {
	return $this->mysqliRaiseError(DB_ERROR_NODBSELECTED);
	}
	}
	$result = @mysqli_query($this->connection, 'COMMIT');
	$result = @mysqli_query($this->connection, 'SET AUTOCOMMIT=1');
	$this->transaction_opcount = 0;
	if (!$result) {
	return $this->mysqliRaiseError();
	}
	}
	return DB_OK;
	}

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

	/**
	* Reverts the current transaction
	*
	* @return int DB_OK on success. A DB_Error object on failure.
	*/
	function rollback()
	{
	if ($this->transaction_opcount > 0) {
	if ($this->_db) {
	if (!@mysqli_select_db($this->connection, $this->_db)) {
	return $this->mysqliRaiseError(DB_ERROR_NODBSELECTED);
	}
	}
	$result = @mysqli_query($this->connection, 'ROLLBACK');
	$result = @mysqli_query($this->connection, 'SET AUTOCOMMIT=1');
	$this->transaction_opcount = 0;
	if (!$result) {
	return $this->mysqliRaiseError();
	}
	}
	return DB_OK;
	}

	// }}}
	// {{{ affectedRows()

	/**
	* Determines the number of rows affected by a data maniuplation query
	*
	* 0 is returned for queries that don't manipulate data.
	*
	* @return int the number of rows. A DB_Error object on failure.
	*/
	function affectedRows()
	{
	if (DB::isManip($this->last_query)) {
	return @mysqli_affected_rows($this->connection);
	} else {
	return 0;
	}
	}

	// }}}
	// {{{ nextId()

	/**
	* Returns the next free id in a sequence
	*
	* @param string $seq_name name of the sequence
	* @param boolean $ondemand when true, the seqence is automatically
	* created if it does not exist
	*
	* @return int the next id number in the sequence.
	* A DB_Error object on failure.
	*
	* @see DB_common::nextID(), DB_common::getSequenceName(),
	* DB_mysqli::createSequence(), DB_mysqli::dropSequence()
	*/
	function nextId($seq_name, $ondemand = true)
	{
	$seqname = $this->getSequenceName($seq_name);
	do {
	$repeat = 0;
	$this->pushErrorHandling(PEAR_ERROR_RETURN);
	$result = $this->query('UPDATE ' . $seqname
	. ' SET id = LAST_INSERT_ID(id + 1)');
	$this->popErrorHandling();
	if ($result === DB_OK) {
	// COMMON CASE
	$id = @mysqli_insert_id($this->connection);
	if ($id != 0) {
	return $id;
	}

	// EMPTY SEQ TABLE
	// Sequence table must be empty for some reason,
	// so fill it and return 1
	// Obtain a user-level lock
	$result = $this->getOne('SELECT GET_LOCK('
	. "'${seqname}_lock', 10)");
	if (DB::isError($result)) {
	return $this->raiseError($result);
	}
	if ($result == 0) {
	return $this->mysqliRaiseError(DB_ERROR_NOT_LOCKED);
	}

	// add the default value
	$result = $this->query('REPLACE INTO ' . $seqname
	. ' (id) VALUES (0)');
	if (DB::isError($result)) {
	return $this->raiseError($result);
	}

	// Release the lock
	$result = $this->getOne('SELECT RELEASE_LOCK('
	. "'${seqname}_lock')");
	if (DB::isError($result)) {
	return $this->raiseError($result);
	}
	// We know what the result will be, so no need to try again
	return 1;

	} elseif ($ondemand && DB::isError($result) &&
	$result->getCode() == DB_ERROR_NOSUCHTABLE)
	{
	// ONDEMAND TABLE CREATION
	$result = $this->createSequence($seq_name);

	// Since createSequence initializes the ID to be 1,
	// we do not need to retrieve the ID again (or we will get 2)
	if (DB::isError($result)) {
	return $this->raiseError($result);
	} else {
	// First ID of a newly created sequence is 1
	return 1;
	}

	} elseif (DB::isError($result) &&
	$result->getCode() == DB_ERROR_ALREADY_EXISTS)
	{
	// BACKWARDS COMPAT
	// see _BCsequence() comment
	$result = $this->_BCsequence($seqname);
	if (DB::isError($result)) {
	return $this->raiseError($result);
	}
	$repeat = 1;
	}
	} while ($repeat);

	return $this->raiseError($result);
	}

	/**
	* Creates a new sequence
	*
	* @param string $seq_name name of the new sequence
	*
	* @return int DB_OK on success. A DB_Error object on failure.
	*
	* @see DB_common::createSequence(), DB_common::getSequenceName(),
	* DB_mysqli::nextID(), DB_mysqli::dropSequence()
	*/
	function createSequence($seq_name)
	{
	$seqname = $this->getSequenceName($seq_name);
	$res = $this->query('CREATE TABLE ' . $seqname
	. ' (id INTEGER UNSIGNED AUTO_INCREMENT NOT NULL,'
	. ' PRIMARY KEY(id))');
	if (DB::isError($res)) {
	return $res;
	}
	// insert yields value 1, nextId call will generate ID 2
	return $this->query("INSERT INTO ${seqname} (id) VALUES (0)");
	}

	// }}}
	// {{{ dropSequence()

	/**
	* Deletes a sequence
	*
	* @param string $seq_name name of the sequence to be deleted
	*
	* @return int DB_OK on success. A DB_Error object on failure.
	*
	* @see DB_common::dropSequence(), DB_common::getSequenceName(),
	* DB_mysql::nextID(), DB_mysql::createSequence()
	*/
	function dropSequence($seq_name)
	{
	return $this->query('DROP TABLE ' . $this->getSequenceName($seq_name));
	}

	// }}}
	// {{{ _BCsequence()

	/**
	* Backwards compatibility with old sequence emulation implementation
	* (clean up the dupes)
	*
	* @param string $seqname the sequence name to clean up
	*
	* @return bool true on success. A DB_Error object on failure.
	*
	* @access private
	*/
	function _BCsequence($seqname)
	{
	// Obtain a user-level lock... this will release any previous
	// application locks, but unlike LOCK TABLES, it does not abort
	// the current transaction and is much less frequently used.
	$result = $this->getOne("SELECT GET_LOCK('${seqname}_lock',10)");
	if (DB::isError($result)) {
	return $result;
	}
	if ($result == 0) {
	// Failed to get the lock, can't do the conversion, bail
	// with a DB_ERROR_NOT_LOCKED error
	return $this->mysqliRaiseError(DB_ERROR_NOT_LOCKED);
	}

	$highest_id = $this->getOne("SELECT MAX(id) FROM ${seqname}");
	if (DB::isError($highest_id)) {
	return $highest_id;
	}

	// This should kill all rows except the highest
	// We should probably do something if $highest_id isn't
	// numeric, but I'm at a loss as how to handle that...
	$result = $this->query('DELETE FROM ' . $seqname
	. " WHERE id <> $highest_id");
	if (DB::isError($result)) {
	return $result;
	}

	// If another thread has been waiting for this lock,
	// it will go thru the above procedure, but will have no
	// real effect
	$result = $this->getOne("SELECT RELEASE_LOCK('${seqname}_lock')");
	if (DB::isError($result)) {
	return $result;
	}
	return true;
	}

	// }}}
	// {{{ quoteIdentifier()

	/**
	* Quotes a string so it can be safely used as a table or column name
	*
	* MySQL can't handle the backtick character (<kbd>`</kbd>) in
	* table or column names.
	*
	* @param string $str identifier name to be quoted
	*
	* @return string quoted identifier string
	*
	* @see DB_common::quoteIdentifier()
	* @since Method available since Release 1.6.0
	*/
	function quoteIdentifier($str)
	{
	return '`' . $str . '`';
	}

	// }}}
	// {{{ escapeSimple()

	/**
	* Escapes a string according to the current DBMS's standards
	*
	* @param string $str the string to be escaped
	*
	* @return string the escaped string
	*
	* @see DB_common::quoteSmart()
	* @since Method available since Release 1.6.0
	*/
	function escapeSimple($str)
	{
	return @mysqli_real_escape_string($this->connection, $str);
	}

	// }}}
	// {{{ modifyLimitQuery()

	/**
	* Adds LIMIT clauses to a query string according to current DBMS standards
	*
	* @param string $query the query to modify
	* @param int $from the row to start to fetching (0 = the first row)
	* @param int $count the numbers of rows to fetch
	* @param mixed $params array, string or numeric data to be used in
	* execution of the statement. Quantity of items
	* passed must match quantity of placeholders in
	* query: meaning 1 placeholder for non-array
	* parameters or 1 placeholder per array element.
	*
	* @return string the query string with LIMIT clauses added
	*
	* @access protected
	*/
	function modifyLimitQuery($query, $from, $count, $params = array())
	{
	if (DB::isManip($query)) {
	return $query . " LIMIT $count";
	} else {
	return $query . " LIMIT $from, $count";
	}
	}

	// }}}
	// {{{ mysqliRaiseError()

	/**
	* Produces a DB_Error object regarding the current problem
	*
	* @param int $errno if the error is being manually raised pass a
	* DB_ERROR* constant here. If this isn't passed
	* the error information gathered from the DBMS.
	*
	* @return object the DB_Error object
	*
	* @see DB_common::raiseError(),
	* DB_mysqli::errorNative(), DB_common::errorCode()
	*/
	function mysqliRaiseError($errno = null)
	{
	if ($errno === null) {
	if ($this->options['portability'] & DB_PORTABILITY_ERRORS) {
	$this->errorcode_map[1022] = DB_ERROR_CONSTRAINT;
	$this->errorcode_map[1048] = DB_ERROR_CONSTRAINT_NOT_NULL;
	$this->errorcode_map[1062] = DB_ERROR_CONSTRAINT;
	} else {
	// Doing this in case mode changes during runtime.
	$this->errorcode_map[1022] = DB_ERROR_ALREADY_EXISTS;
	$this->errorcode_map[1048] = DB_ERROR_CONSTRAINT;
	$this->errorcode_map[1062] = DB_ERROR_ALREADY_EXISTS;
	}
	$errno = $this->errorCode(mysqli_errno($this->connection));
	}
	return $this->raiseError($errno, null, null, null,
	@mysqli_errno($this->connection) . ' ** ' .
	@mysqli_error($this->connection));
	}

	// }}}
	// {{{ errorNative()

	/**
	* Gets the DBMS' native error code produced by the last query
	*
	* @return int the DBMS' error code
	*/
	function errorNative()
	{
	return @mysqli_errno($this->connection);
	}

	// }}}
	// {{{ tableInfo()

	/**
	* Returns information about a table or a result set
	*
	* @param object\|string $result DB_result object from a query or a
	* string containing the name of a table.
	* While this also accepts a query result
	* resource identifier, this behavior is
	* deprecated.
	* @param int $mode a valid tableInfo mode
	*
	* @return array an associative array with the information requested.
	* A DB_Error object on failure.
	*
	* @see DB_common::setOption()
	*/
	function tableInfo($result, $mode = null)
	{
	if (is_string($result)) {
	/*
	* Probably received a table name.
	* Create a result resource identifier.
	*/
	$id = @mysqli_query($this->connection,
	"SELECT * FROM $result LIMIT 0");
	$got_string = true;
	} elseif (isset($result->result)) {
	/*
	* Probably received a result object.
	* Extract the result resource identifier.
	*/
	$id = $result->result;
	$got_string = false;
	} else {
	/*
	* Probably received a result resource identifier.
	* Copy it.
	* Deprecated. Here for compatibility only.
	*/
	$id = $result;
	$got_string = false;
	}

	if (!is_a($id, 'mysqli_result')) {
	return $this->mysqliRaiseError(DB_ERROR_NEED_MORE_DATA);
	}

	if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE) {
	$case_func = 'strtolower';
	} else {
	$case_func = 'strval';
	}

	$count = @mysqli_num_fields($id);
	$res = array();

	if ($mode) {
	$res['num_fields'] = $count;
	}

	for ($i = 0; $i < $count; $i++) {
	$tmp = @mysqli_fetch_field($id);

	$flags = '';
	foreach ($this->mysqli_flags as $const => $means) {
	if ($tmp->flags & $const) {
	$flags .= $means . ' ';
	}
	}
	if ($tmp->def) {
	$flags .= 'default_' . rawurlencode($tmp->def);
	}
	$flags = trim($flags);

	$res[$i] = array(
	'table' => $case_func($tmp->table),
	'name' => $case_func($tmp->name),
	'type' => isset($this->mysqli_types[$tmp->type])
	? $this->mysqli_types[$tmp->type]
	: 'unknown',
	'len' => $tmp->max_length,
	'flags' => $flags,
	);

	if ($mode & DB_TABLEINFO_ORDER) {
	$res['order'][$res[$i]['name']] = $i;
	}
	if ($mode & DB_TABLEINFO_ORDERTABLE) {
	$res['ordertable'][$res[$i]['table']][$res[$i]['name']] = $i;
	}
	}

	// free the result only if we were called on a table
	if ($got_string) {
	@mysqli_free_result($id);
	}
	return $res;
	}

	// }}}
	// {{{ getSpecialQuery()

	/**
	* Obtains the query string needed for listing a given type of objects
	*
	* @param string $type the kind of objects you want to retrieve
	*
	* @return string the SQL query string or null if the driver doesn't
	* support the object type requested
	*
	* @access protected
	* @see DB_common::getListOf()
	*/
	function getSpecialQuery($type)
	{
	switch ($type) {
	case 'tables':
	return 'SHOW TABLES';
	case 'users':
	return 'SELECT DISTINCT User FROM mysql.user';
	case 'databases':
	return 'SHOW DATABASES';
	default:
	return null;
	}
	}

	// }}}

	}

	/*
	* Local variables:
	* tab-width: 4
	* c-basic-offset: 4
	* End:
	*/

	?>

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