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2006-12-16 77c28206a14b5bee3f3091f10cffd531bce5649c

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1676e1	1	<?php
S	2
	3	/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
	4
	5	/**
	6	* The PEAR DB driver for PHP's mysqli extension
	7	* for interacting with MySQL databases
	8	*
	9	* PHP versions 4 and 5
	10	*
	11	* LICENSE: This source file is subject to version 3.0 of the PHP license
	12	* that is available through the world-wide-web at the following URI:
	13	* http://www.php.net/license/3_0.txt. If you did not receive a copy of
	14	* the PHP License and are unable to obtain it through the web, please
	15	* send a note to license@php.net so we can mail you a copy immediately.
	16	*
	17	* @category Database
	18	* @package DB
	19	* @author Daniel Convissor <danielc@php.net>
	20	* @copyright 1997-2005 The PHP Group
	21	* @license http://www.php.net/license/3_0.txt PHP License 3.0
	22	* @version CVS: $Id$
	23	* @link http://pear.php.net/package/DB
	24	*/
	25
	26	/**
	27	* Obtain the DB_common class so it can be extended from
	28	*/
	29	require_once 'DB/common.php';
	30
	31	/**
	32	* The methods PEAR DB uses to interact with PHP's mysqli extension
	33	* for interacting with MySQL databases
	34	*
	35	* This is for MySQL versions 4.1 and above. Requires PHP 5.
	36	*
	37	* Note that persistent connections no longer exist.
	38	*
	39	* These methods overload the ones declared in DB_common.
	40	*
	41	* @category Database
	42	* @package DB
	43	* @author Daniel Convissor <danielc@php.net>
	44	* @copyright 1997-2005 The PHP Group
	45	* @license http://www.php.net/license/3_0.txt PHP License 3.0
	46	* @version Release: @package_version@
	47	* @link http://pear.php.net/package/DB
	48	* @since Class functional since Release 1.6.3
	49	*/
	50	class DB_mysqli extends DB_common
	51	{
	52	// {{{ properties
	53
	54	/**
	55	* The DB driver type (mysql, oci8, odbc, etc.)
	56	* @var string
	57	*/
	58	var $phptype = 'mysqli';
	59
	60	/**
	61	* The database syntax variant to be used (db2, access, etc.), if any
	62	* @var string
	63	*/
	64	var $dbsyntax = 'mysqli';
	65
	66	/**
	67	* The capabilities of this DB implementation
	68	*
	69	* The 'new_link' element contains the PHP version that first provided
	70	* new_link support for this DBMS. Contains false if it's unsupported.
	71	*
	72	* Meaning of the 'limit' element:
	73	* + 'emulate' = emulate with fetch row by number
	74	* + 'alter' = alter the query
	75	* + false = skip rows
	76	*
	77	* @var array
	78	*/
	79	var $features = array(
	80	'limit' => 'alter',
	81	'new_link' => false,
	82	'numrows' => true,
	83	'pconnect' => false,
	84	'prepare' => false,
	85	'ssl' => true,
	86	'transactions' => true,
	87	);
	88
	89	/**
	90	* A mapping of native error codes to DB error codes
	91	* @var array
	92	*/
	93	var $errorcode_map = array(
	94	1004 => DB_ERROR_CANNOT_CREATE,
	95	1005 => DB_ERROR_CANNOT_CREATE,
	96	1006 => DB_ERROR_CANNOT_CREATE,
	97	1007 => DB_ERROR_ALREADY_EXISTS,
	98	1008 => DB_ERROR_CANNOT_DROP,
	99	1022 => DB_ERROR_ALREADY_EXISTS,
	100	1044 => DB_ERROR_ACCESS_VIOLATION,
	101	1046 => DB_ERROR_NODBSELECTED,
	102	1048 => DB_ERROR_CONSTRAINT,
	103	1049 => DB_ERROR_NOSUCHDB,
	104	1050 => DB_ERROR_ALREADY_EXISTS,
	105	1051 => DB_ERROR_NOSUCHTABLE,
	106	1054 => DB_ERROR_NOSUCHFIELD,
	107	1061 => DB_ERROR_ALREADY_EXISTS,
	108	1062 => DB_ERROR_ALREADY_EXISTS,
	109	1064 => DB_ERROR_SYNTAX,
	110	1091 => DB_ERROR_NOT_FOUND,
	111	1100 => DB_ERROR_NOT_LOCKED,
	112	1136 => DB_ERROR_VALUE_COUNT_ON_ROW,
	113	1142 => DB_ERROR_ACCESS_VIOLATION,
	114	1146 => DB_ERROR_NOSUCHTABLE,
	115	1216 => DB_ERROR_CONSTRAINT,
	116	1217 => DB_ERROR_CONSTRAINT,
	117	);
	118
	119	/**
	120	* The raw database connection created by PHP
	121	* @var resource
	122	*/
	123	var $connection;
	124
	125	/**
	126	* The DSN information for connecting to a database
	127	* @var array
	128	*/
	129	var $dsn = array();
	130
	131
	132	/**
	133	* Should data manipulation queries be committed automatically?
	134	* @var bool
	135	* @access private
	136	*/
	137	var $autocommit = true;
	138
	139	/**
	140	* The quantity of transactions begun
	141	*
	142	* {@internal While this is private, it can't actually be designated
	143	* private in PHP 5 because it is directly accessed in the test suite.}}
	144	*
	145	* @var integer
	146	* @access private
	147	*/
	148	var $transaction_opcount = 0;
	149
	150	/**
	151	* The database specified in the DSN
	152	*
	153	* It's a fix to allow calls to different databases in the same script.
	154	*
	155	* @var string
	156	* @access private
	157	*/
	158	var $_db = '';
	159
	160	/**
	161	* Array for converting MYSQLI_*_FLAG constants to text values
	162	* @var array
	163	* @access public
	164	* @since Property available since Release 1.6.5
	165	*/
	166	var $mysqli_flags = array(
	167	MYSQLI_NOT_NULL_FLAG => 'not_null',
	168	MYSQLI_PRI_KEY_FLAG => 'primary_key',
	169	MYSQLI_UNIQUE_KEY_FLAG => 'unique_key',
	170	MYSQLI_MULTIPLE_KEY_FLAG => 'multiple_key',
	171	MYSQLI_BLOB_FLAG => 'blob',
	172	MYSQLI_UNSIGNED_FLAG => 'unsigned',
	173	MYSQLI_ZEROFILL_FLAG => 'zerofill',
	174	MYSQLI_AUTO_INCREMENT_FLAG => 'auto_increment',
	175	MYSQLI_TIMESTAMP_FLAG => 'timestamp',
	176	MYSQLI_SET_FLAG => 'set',
	177	// MYSQLI_NUM_FLAG => 'numeric', // unnecessary
	178	// MYSQLI_PART_KEY_FLAG => 'multiple_key', // duplicatvie
	179	MYSQLI_GROUP_FLAG => 'group_by'
	180	);
	181
	182	/**
	183	* Array for converting MYSQLI_TYPE_* constants to text values
	184	* @var array
	185	* @access public
	186	* @since Property available since Release 1.6.5
	187	*/
	188	var $mysqli_types = array(
	189	MYSQLI_TYPE_DECIMAL => 'decimal',
	190	MYSQLI_TYPE_TINY => 'tinyint',
	191	MYSQLI_TYPE_SHORT => 'int',
	192	MYSQLI_TYPE_LONG => 'int',
	193	MYSQLI_TYPE_FLOAT => 'float',
	194	MYSQLI_TYPE_DOUBLE => 'double',
	195	// MYSQLI_TYPE_NULL => 'DEFAULT NULL', // let flags handle it
	196	MYSQLI_TYPE_TIMESTAMP => 'timestamp',
	197	MYSQLI_TYPE_LONGLONG => 'bigint',
	198	MYSQLI_TYPE_INT24 => 'mediumint',
	199	MYSQLI_TYPE_DATE => 'date',
	200	MYSQLI_TYPE_TIME => 'time',
	201	MYSQLI_TYPE_DATETIME => 'datetime',
	202	MYSQLI_TYPE_YEAR => 'year',
	203	MYSQLI_TYPE_NEWDATE => 'date',
	204	MYSQLI_TYPE_ENUM => 'enum',
	205	MYSQLI_TYPE_SET => 'set',
	206	MYSQLI_TYPE_TINY_BLOB => 'tinyblob',
	207	MYSQLI_TYPE_MEDIUM_BLOB => 'mediumblob',
	208	MYSQLI_TYPE_LONG_BLOB => 'longblob',
	209	MYSQLI_TYPE_BLOB => 'blob',
	210	MYSQLI_TYPE_VAR_STRING => 'varchar',
	211	MYSQLI_TYPE_STRING => 'char',
	212	MYSQLI_TYPE_GEOMETRY => 'geometry',
	213	);
	214
	215
	216	// }}}
	217	// {{{ constructor
	218
	219	/**
	220	* This constructor calls <kbd>$this->DB_common()</kbd>
	221	*
	222	* @return void
	223	*/
	224	function DB_mysqli()
	225	{
	226	$this->DB_common();
	227	}
	228
	229	// }}}
	230	// {{{ connect()
	231
	232	/**
	233	* Connect to the database server, log in and open the database
	234	*
	235	* Don't call this method directly. Use DB::connect() instead.
	236	*
	237	* PEAR DB's mysqli driver supports the following extra DSN options:
	238	* + When the 'ssl' $option passed to DB::connect() is true:
	239	* + key The path to the key file.
	240	* + cert The path to the certificate file.
	241	* + ca The path to the certificate authority file.
	242	* + capath The path to a directory that contains trusted SSL
	243	* CA certificates in pem format.
	244	* + cipher The list of allowable ciphers for SSL encryption.
	245	*
	246	* Example of how to connect using SSL:
	247	* <code>
	248	* require_once 'DB.php';
	249	*
	250	* $dsn = array(
	251	* 'phptype' => 'mysqli',
	252	* 'username' => 'someuser',
	253	* 'password' => 'apasswd',
	254	* 'hostspec' => 'localhost',
	255	* 'database' => 'thedb',
	256	* 'key' => 'client-key.pem',
	257	* 'cert' => 'client-cert.pem',
	258	* 'ca' => 'cacert.pem',
	259	* 'capath' => '/path/to/ca/dir',
	260	* 'cipher' => 'AES',
	261	* );
	262	*
	263	* $options = array(
	264	* 'ssl' => true,
	265	* );
	266	*
	267	* $db =& DB::connect($dsn, $options);
	268	* if (PEAR::isError($db)) {
	269	* die($db->getMessage());
	270	* }
	271	* </code>
	272	*
	273	* @param array $dsn the data source name
	274	* @param bool $persistent should the connection be persistent?
	275	*
	276	* @return int DB_OK on success. A DB_Error object on failure.
	277	*/
	278	function connect($dsn, $persistent = false)
	279	{
	280	if (!PEAR::loadExtension('mysqli')) {
	281	return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);
	282	}
	283
	284	$this->dsn = $dsn;
	285	if ($dsn['dbsyntax']) {
	286	$this->dbsyntax = $dsn['dbsyntax'];
	287	}
	288
	289	$ini = ini_get('track_errors');
	290	ini_set('track_errors', 1);
	291	$php_errormsg = '';
	292
	293	if ($this->getOption('ssl') === true) {
	294	$init = mysqli_init();
	295	mysqli_ssl_set(
	296	$init,
	297	empty($dsn['key']) ? null : $dsn['key'],
	298	empty($dsn['cert']) ? null : $dsn['cert'],
	299	empty($dsn['ca']) ? null : $dsn['ca'],
	300	empty($dsn['capath']) ? null : $dsn['capath'],
	301	empty($dsn['cipher']) ? null : $dsn['cipher']
	302	);
	303	if ($this->connection = @mysqli_real_connect(
	304	$init,
	305	$dsn['hostspec'],
	306	$dsn['username'],
	307	$dsn['password'],
	308	$dsn['database'],
	309	$dsn['port'],
	310	$dsn['socket']))
	311	{
	312	$this->connection = $init;
	313	}
	314	} else {
	315	$this->connection = @mysqli_connect(
	316	$dsn['hostspec'],
	317	$dsn['username'],
	318	$dsn['password'],
	319	$dsn['database'],
	320	$dsn['port'],
	321	$dsn['socket']
	322	);
	323	}
	324
	325	ini_set('track_errors', $ini);
	326
	327	if (!$this->connection) {
	328	if (($err = @mysqli_connect_error()) != '') {
	329	return $this->raiseError(DB_ERROR_CONNECT_FAILED,
	330	null, null, null,
	331	$err);
	332	} else {
	333	return $this->raiseError(DB_ERROR_CONNECT_FAILED,
	334	null, null, null,
	335	$php_errormsg);
	336	}
	337	}
	338
	339	if ($dsn['database']) {
	340	$this->_db = $dsn['database'];
	341	}
	342
	343	return DB_OK;
	344	}
	345
	346	// }}}
	347	// {{{ disconnect()
	348
	349	/**
	350	* Disconnects from the database server
	351	*
	352	* @return bool TRUE on success, FALSE on failure
	353	*/
	354	function disconnect()
	355	{
	356	$ret = @mysqli_close($this->connection);
	357	$this->connection = null;
	358	return $ret;
	359	}
	360
	361	// }}}
	362	// {{{ simpleQuery()
	363
	364	/**
	365	* Sends a query to the database server
	366	*
	367	* @param string the SQL query string
	368	*
	369	* @return mixed + a PHP result resrouce for successful SELECT queries
	370	* + the DB_OK constant for other successful queries
	371	* + a DB_Error object on failure
	372	*/
	373	function simpleQuery($query)
	374	{
	375	$ismanip = DB::isManip($query);
	376	$this->last_query = $query;
	377	$query = $this->modifyQuery($query);
	378	if ($this->_db) {
	379	if (!@mysqli_select_db($this->connection, $this->_db)) {
	380	return $this->mysqliRaiseError(DB_ERROR_NODBSELECTED);
	381	}
	382	}
	383	if (!$this->autocommit && $ismanip) {
	384	if ($this->transaction_opcount == 0) {
	385	$result = @mysqli_query($this->connection, 'SET AUTOCOMMIT=0');
	386	$result = @mysqli_query($this->connection, 'BEGIN');
	387	if (!$result) {
	388	return $this->mysqliRaiseError();
	389	}
	390	}
	391	$this->transaction_opcount++;
	392	}
	393	$result = @mysqli_query($this->connection, $query);
	394	if (!$result) {
	395	return $this->mysqliRaiseError();
	396	}
	397	if (is_object($result)) {
	398	return $result;
	399	}
	400	return DB_OK;
	401	}
	402
	403	// }}}
	404	// {{{ nextResult()
	405
	406	/**
	407	* Move the internal mysql result pointer to the next available result.
	408	*
	409	* This method has not been implemented yet.
	410	*
	411	* @param resource $result a valid sql result resource
	412	* @return false
	413	* @access public
	414	*/
	415	function nextResult($result)
	416	{
	417	return false;
	418	}
	419
	420	// }}}
	421	// {{{ fetchInto()
	422
	423	/**
	424	* Places a row from the result set into the given array
	425	*
	426	* Formating of the array and the data therein are configurable.
	427	* See DB_result::fetchInto() for more information.
	428	*
	429	* This method is not meant to be called directly. Use
	430	* DB_result::fetchInto() instead. It can't be declared "protected"
	431	* because DB_result is a separate object.
	432	*
	433	* @param resource $result the query result resource
	434	* @param array $arr the referenced array to put the data in
	435	* @param int $fetchmode how the resulting array should be indexed
	436	* @param int $rownum the row number to fetch (0 = first row)
	437	*
	438	* @return mixed DB_OK on success, NULL when the end of a result set is
	439	* reached or on failure
	440	*
	441	* @see DB_result::fetchInto()
	442	*/
	443	function fetchInto($result, &$arr, $fetchmode, $rownum = null)
	444	{
	445	if ($rownum !== null) {
	446	if (!@mysqli_data_seek($result, $rownum)) {
	447	return null;
	448	}
	449	}
	450	if ($fetchmode & DB_FETCHMODE_ASSOC) {
	451	$arr = @mysqli_fetch_array($result, MYSQLI_ASSOC);
	452	if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE && $arr) {
	453	$arr = array_change_key_case($arr, CASE_LOWER);
	454	}
	455	} else {
	456	$arr = @mysqli_fetch_row($result);
	457	}
	458	if (!$arr) {
	459	return null;
	460	}
	461	if ($this->options['portability'] & DB_PORTABILITY_RTRIM) {
	462	/*
	463	* Even though this DBMS already trims output, we do this because
	464	* a field might have intentional whitespace at the end that
	465	* gets removed by DB_PORTABILITY_RTRIM under another driver.
	466	*/
	467	$this->_rtrimArrayValues($arr);
	468	}
	469	if ($this->options['portability'] & DB_PORTABILITY_NULL_TO_EMPTY) {
	470	$this->_convertNullArrayValuesToEmpty($arr);
	471	}
	472	return DB_OK;
	473	}
	474
	475	// }}}
	476	// {{{ freeResult()
	477
	478	/**
	479	* Deletes the result set and frees the memory occupied by the result set
	480	*
	481	* This method is not meant to be called directly. Use
	482	* DB_result::free() instead. It can't be declared "protected"
	483	* because DB_result is a separate object.
	484	*
	485	* @param resource $result PHP's query result resource
	486	*
	487	* @return bool TRUE on success, FALSE if $result is invalid
	488	*
	489	* @see DB_result::free()
	490	*/
	491	function freeResult($result)
	492	{
	493	return @mysqli_free_result($result);
	494	}
	495
	496	// }}}
	497	// {{{ numCols()
	498
	499	/**
	500	* Gets the number of columns in a result set
	501	*
	502	* This method is not meant to be called directly. Use
	503	* DB_result::numCols() instead. It can't be declared "protected"
	504	* because DB_result is a separate object.
	505	*
	506	* @param resource $result PHP's query result resource
	507	*
	508	* @return int the number of columns. A DB_Error object on failure.
	509	*
	510	* @see DB_result::numCols()
	511	*/
	512	function numCols($result)
	513	{
	514	$cols = @mysqli_num_fields($result);
	515	if (!$cols) {
	516	return $this->mysqliRaiseError();
	517	}
	518	return $cols;
	519	}
	520
	521	// }}}
	522	// {{{ numRows()
	523
	524	/**
	525	* Gets the number of rows in a result set
	526	*
	527	* This method is not meant to be called directly. Use
	528	* DB_result::numRows() instead. It can't be declared "protected"
	529	* because DB_result is a separate object.
	530	*
	531	* @param resource $result PHP's query result resource
	532	*
	533	* @return int the number of rows. A DB_Error object on failure.
	534	*
	535	* @see DB_result::numRows()
	536	*/
	537	function numRows($result)
	538	{
	539	$rows = @mysqli_num_rows($result);
	540	if ($rows === null) {
	541	return $this->mysqliRaiseError();
	542	}
	543	return $rows;
	544	}
	545
	546	// }}}
	547	// {{{ autoCommit()
	548
	549	/**
	550	* Enables or disables automatic commits
	551	*
	552	* @param bool $onoff true turns it on, false turns it off
	553	*
	554	* @return int DB_OK on success. A DB_Error object if the driver
	555	* doesn't support auto-committing transactions.
	556	*/
	557	function autoCommit($onoff = false)
	558	{
	559	// XXX if $this->transaction_opcount > 0, we should probably
	560	// issue a warning here.
	561	$this->autocommit = $onoff ? true : false;
	562	return DB_OK;
	563	}
	564
	565	// }}}
	566	// {{{ commit()
	567
	568	/**
	569	* Commits the current transaction
	570	*
	571	* @return int DB_OK on success. A DB_Error object on failure.
	572	*/
	573	function commit()
	574	{
	575	if ($this->transaction_opcount > 0) {
	576	if ($this->_db) {
	577	if (!@mysqli_select_db($this->connection, $this->_db)) {
	578	return $this->mysqliRaiseError(DB_ERROR_NODBSELECTED);
	579	}
	580	}
	581	$result = @mysqli_query($this->connection, 'COMMIT');
	582	$result = @mysqli_query($this->connection, 'SET AUTOCOMMIT=1');
	583	$this->transaction_opcount = 0;
	584	if (!$result) {
	585	return $this->mysqliRaiseError();
	586	}
	587	}
	588	return DB_OK;
	589	}
	590
	591	// }}}
	592	// {{{ rollback()
	593
	594	/**
	595	* Reverts the current transaction
	596	*
	597	* @return int DB_OK on success. A DB_Error object on failure.
	598	*/
	599	function rollback()
	600	{
	601	if ($this->transaction_opcount > 0) {
	602	if ($this->_db) {
	603	if (!@mysqli_select_db($this->connection, $this->_db)) {
	604	return $this->mysqliRaiseError(DB_ERROR_NODBSELECTED);
	605	}
	606	}
	607	$result = @mysqli_query($this->connection, 'ROLLBACK');
	608	$result = @mysqli_query($this->connection, 'SET AUTOCOMMIT=1');
	609	$this->transaction_opcount = 0;
	610	if (!$result) {
	611	return $this->mysqliRaiseError();
	612	}
	613	}
	614	return DB_OK;
	615	}
	616
	617	// }}}
	618	// {{{ affectedRows()
	619
	620	/**
	621	* Determines the number of rows affected by a data maniuplation query
	622	*
	623	* 0 is returned for queries that don't manipulate data.
	624	*
	625	* @return int the number of rows. A DB_Error object on failure.
	626	*/
	627	function affectedRows()
	628	{
	629	if (DB::isManip($this->last_query)) {
	630	return @mysqli_affected_rows($this->connection);
	631	} else {
	632	return 0;
	633	}
	634	}
	635
	636	// }}}
	637	// {{{ nextId()
	638
	639	/**
	640	* Returns the next free id in a sequence
	641	*
	642	* @param string $seq_name name of the sequence
	643	* @param boolean $ondemand when true, the seqence is automatically
	644	* created if it does not exist
	645	*
	646	* @return int the next id number in the sequence.
	647	* A DB_Error object on failure.
	648	*
	649	* @see DB_common::nextID(), DB_common::getSequenceName(),
	650	* DB_mysqli::createSequence(), DB_mysqli::dropSequence()
	651	*/
	652	function nextId($seq_name, $ondemand = true)
	653	{
	654	$seqname = $this->getSequenceName($seq_name);
	655	do {
	656	$repeat = 0;
	657	$this->pushErrorHandling(PEAR_ERROR_RETURN);
	658	$result = $this->query('UPDATE ' . $seqname
	659	. ' SET id = LAST_INSERT_ID(id + 1)');
	660	$this->popErrorHandling();
	661	if ($result === DB_OK) {
	662	// COMMON CASE
	663	$id = @mysqli_insert_id($this->connection);
	664	if ($id != 0) {
	665	return $id;
	666	}
	667
	668	// EMPTY SEQ TABLE
	669	// Sequence table must be empty for some reason,
	670	// so fill it and return 1
	671	// Obtain a user-level lock
	672	$result = $this->getOne('SELECT GET_LOCK('
	673	. "'${seqname}_lock', 10)");
	674	if (DB::isError($result)) {
	675	return $this->raiseError($result);
	676	}
	677	if ($result == 0) {
	678	return $this->mysqliRaiseError(DB_ERROR_NOT_LOCKED);
	679	}
	680
	681	// add the default value
	682	$result = $this->query('REPLACE INTO ' . $seqname
	683	. ' (id) VALUES (0)');
	684	if (DB::isError($result)) {
	685	return $this->raiseError($result);
	686	}
	687
	688	// Release the lock
	689	$result = $this->getOne('SELECT RELEASE_LOCK('
	690	. "'${seqname}_lock')");
	691	if (DB::isError($result)) {
	692	return $this->raiseError($result);
	693	}
	694	// We know what the result will be, so no need to try again
	695	return 1;
	696
	697	} elseif ($ondemand && DB::isError($result) &&
	698	$result->getCode() == DB_ERROR_NOSUCHTABLE)
	699	{
	700	// ONDEMAND TABLE CREATION
	701	$result = $this->createSequence($seq_name);
	702
	703	// Since createSequence initializes the ID to be 1,
	704	// we do not need to retrieve the ID again (or we will get 2)
	705	if (DB::isError($result)) {
	706	return $this->raiseError($result);
	707	} else {
	708	// First ID of a newly created sequence is 1
	709	return 1;
	710	}
	711
	712	} elseif (DB::isError($result) &&
	713	$result->getCode() == DB_ERROR_ALREADY_EXISTS)
	714	{
	715	// BACKWARDS COMPAT
	716	// see _BCsequence() comment
	717	$result = $this->_BCsequence($seqname);
	718	if (DB::isError($result)) {
	719	return $this->raiseError($result);
	720	}
	721	$repeat = 1;
	722	}
	723	} while ($repeat);
	724
	725	return $this->raiseError($result);
	726	}
	727
	728	/**
	729	* Creates a new sequence
	730	*
	731	* @param string $seq_name name of the new sequence
	732	*
	733	* @return int DB_OK on success. A DB_Error object on failure.
	734	*
	735	* @see DB_common::createSequence(), DB_common::getSequenceName(),
	736	* DB_mysqli::nextID(), DB_mysqli::dropSequence()
	737	*/
	738	function createSequence($seq_name)
	739	{
	740	$seqname = $this->getSequenceName($seq_name);
	741	$res = $this->query('CREATE TABLE ' . $seqname
	742	. ' (id INTEGER UNSIGNED AUTO_INCREMENT NOT NULL,'
	743	. ' PRIMARY KEY(id))');
	744	if (DB::isError($res)) {
	745	return $res;
	746	}
	747	// insert yields value 1, nextId call will generate ID 2
	748	return $this->query("INSERT INTO ${seqname} (id) VALUES (0)");
	749	}
	750
	751	// }}}
	752	// {{{ dropSequence()
	753
	754	/**
	755	* Deletes a sequence
	756	*
	757	* @param string $seq_name name of the sequence to be deleted
	758	*
	759	* @return int DB_OK on success. A DB_Error object on failure.
	760	*
	761	* @see DB_common::dropSequence(), DB_common::getSequenceName(),
	762	* DB_mysql::nextID(), DB_mysql::createSequence()
	763	*/
	764	function dropSequence($seq_name)
	765	{
	766	return $this->query('DROP TABLE ' . $this->getSequenceName($seq_name));
	767	}
	768
	769	// }}}
	770	// {{{ _BCsequence()
	771
	772	/**
	773	* Backwards compatibility with old sequence emulation implementation
	774	* (clean up the dupes)
	775	*
	776	* @param string $seqname the sequence name to clean up
	777	*
	778	* @return bool true on success. A DB_Error object on failure.
	779	*
	780	* @access private
	781	*/
	782	function _BCsequence($seqname)
	783	{
	784	// Obtain a user-level lock... this will release any previous
	785	// application locks, but unlike LOCK TABLES, it does not abort
	786	// the current transaction and is much less frequently used.
	787	$result = $this->getOne("SELECT GET_LOCK('${seqname}_lock',10)");
	788	if (DB::isError($result)) {
	789	return $result;
	790	}
	791	if ($result == 0) {
	792	// Failed to get the lock, can't do the conversion, bail
	793	// with a DB_ERROR_NOT_LOCKED error
	794	return $this->mysqliRaiseError(DB_ERROR_NOT_LOCKED);
	795	}
	796
	797	$highest_id = $this->getOne("SELECT MAX(id) FROM ${seqname}");
	798	if (DB::isError($highest_id)) {
	799	return $highest_id;
	800	}
	801
	802	// This should kill all rows except the highest
	803	// We should probably do something if $highest_id isn't
	804	// numeric, but I'm at a loss as how to handle that...
	805	$result = $this->query('DELETE FROM ' . $seqname
	806	. " WHERE id <> $highest_id");
	807	if (DB::isError($result)) {
	808	return $result;
	809	}
	810
	811	// If another thread has been waiting for this lock,
	812	// it will go thru the above procedure, but will have no
	813	// real effect
	814	$result = $this->getOne("SELECT RELEASE_LOCK('${seqname}_lock')");
	815	if (DB::isError($result)) {
	816	return $result;
	817	}
	818	return true;
	819	}
	820
	821	// }}}
	822	// {{{ quoteIdentifier()
	823
	824	/**
	825	* Quotes a string so it can be safely used as a table or column name
	826	*
	827	* MySQL can't handle the backtick character (<kbd>`</kbd>) in
	828	* table or column names.
	829	*
	830	* @param string $str identifier name to be quoted
	831	*
	832	* @return string quoted identifier string
	833	*
	834	* @see DB_common::quoteIdentifier()
	835	* @since Method available since Release 1.6.0
	836	*/
	837	function quoteIdentifier($str)
	838	{
	839	return '`' . $str . '`';
	840	}
	841
	842	// }}}
	843	// {{{ escapeSimple()
	844
	845	/**
	846	* Escapes a string according to the current DBMS's standards
	847	*
	848	* @param string $str the string to be escaped
	849	*
	850	* @return string the escaped string
	851	*
	852	* @see DB_common::quoteSmart()
	853	* @since Method available since Release 1.6.0
	854	*/
	855	function escapeSimple($str)
	856	{
	857	return @mysqli_real_escape_string($this->connection, $str);
	858	}
	859
	860	// }}}
	861	// {{{ modifyLimitQuery()
	862
	863	/**
	864	* Adds LIMIT clauses to a query string according to current DBMS standards
	865	*
	866	* @param string $query the query to modify
	867	* @param int $from the row to start to fetching (0 = the first row)
	868	* @param int $count the numbers of rows to fetch
	869	* @param mixed $params array, string or numeric data to be used in
	870	* execution of the statement. Quantity of items
	871	* passed must match quantity of placeholders in
	872	* query: meaning 1 placeholder for non-array
	873	* parameters or 1 placeholder per array element.
	874	*
	875	* @return string the query string with LIMIT clauses added
	876	*
	877	* @access protected
	878	*/
	879	function modifyLimitQuery($query, $from, $count, $params = array())
	880	{
	881	if (DB::isManip($query)) {
	882	return $query . " LIMIT $count";
	883	} else {
	884	return $query . " LIMIT $from, $count";
	885	}
	886	}
	887
	888	// }}}
	889	// {{{ mysqliRaiseError()
	890
	891	/**
	892	* Produces a DB_Error object regarding the current problem
	893	*
	894	* @param int $errno if the error is being manually raised pass a
	895	* DB_ERROR* constant here. If this isn't passed
	896	* the error information gathered from the DBMS.
	897	*
	898	* @return object the DB_Error object
	899	*
	900	* @see DB_common::raiseError(),
	901	* DB_mysqli::errorNative(), DB_common::errorCode()
	902	*/
	903	function mysqliRaiseError($errno = null)
	904	{
	905	if ($errno === null) {
	906	if ($this->options['portability'] & DB_PORTABILITY_ERRORS) {
	907	$this->errorcode_map[1022] = DB_ERROR_CONSTRAINT;
	908	$this->errorcode_map[1048] = DB_ERROR_CONSTRAINT_NOT_NULL;
	909	$this->errorcode_map[1062] = DB_ERROR_CONSTRAINT;
	910	} else {
	911	// Doing this in case mode changes during runtime.
	912	$this->errorcode_map[1022] = DB_ERROR_ALREADY_EXISTS;
	913	$this->errorcode_map[1048] = DB_ERROR_CONSTRAINT;
	914	$this->errorcode_map[1062] = DB_ERROR_ALREADY_EXISTS;
	915	}
	916	$errno = $this->errorCode(mysqli_errno($this->connection));
	917	}
	918	return $this->raiseError($errno, null, null, null,
	919	@mysqli_errno($this->connection) . ' ** ' .
	920	@mysqli_error($this->connection));
	921	}
	922
	923	// }}}
	924	// {{{ errorNative()
	925
	926	/**
	927	* Gets the DBMS' native error code produced by the last query
	928	*
	929	* @return int the DBMS' error code
	930	*/
	931	function errorNative()
	932	{
	933	return @mysqli_errno($this->connection);
	934	}
	935
	936	// }}}
	937	// {{{ tableInfo()
	938
	939	/**
	940	* Returns information about a table or a result set
	941	*
	942	* @param object\|string $result DB_result object from a query or a
	943	* string containing the name of a table.
	944	* While this also accepts a query result
	945	* resource identifier, this behavior is
	946	* deprecated.
	947	* @param int $mode a valid tableInfo mode
	948	*
	949	* @return array an associative array with the information requested.
	950	* A DB_Error object on failure.
	951	*
	952	* @see DB_common::setOption()
	953	*/
	954	function tableInfo($result, $mode = null)
	955	{
	956	if (is_string($result)) {
	957	/*
	958	* Probably received a table name.
	959	* Create a result resource identifier.
	960	*/
	961	$id = @mysqli_query($this->connection,
	962	"SELECT * FROM $result LIMIT 0");
	963	$got_string = true;
	964	} elseif (isset($result->result)) {
	965	/*
	966	* Probably received a result object.
	967	* Extract the result resource identifier.
	968	*/
	969	$id = $result->result;
	970	$got_string = false;
	971	} else {
	972	/*
	973	* Probably received a result resource identifier.
	974	* Copy it.
	975	* Deprecated. Here for compatibility only.
	976	*/
	977	$id = $result;
	978	$got_string = false;
	979	}
	980
	981	if (!is_a($id, 'mysqli_result')) {
	982	return $this->mysqliRaiseError(DB_ERROR_NEED_MORE_DATA);
	983	}
	984
	985	if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE) {
	986	$case_func = 'strtolower';
	987	} else {
	988	$case_func = 'strval';
	989	}
	990
	991	$count = @mysqli_num_fields($id);
	992	$res = array();
	993
	994	if ($mode) {
	995	$res['num_fields'] = $count;
	996	}
	997
	998	for ($i = 0; $i < $count; $i++) {
	999	$tmp = @mysqli_fetch_field($id);
	1000
	1001	$flags = '';
	1002	foreach ($this->mysqli_flags as $const => $means) {
	1003	if ($tmp->flags & $const) {
	1004	$flags .= $means . ' ';
	1005	}
	1006	}
	1007	if ($tmp->def) {
	1008	$flags .= 'default_' . rawurlencode($tmp->def);
	1009	}
	1010	$flags = trim($flags);
	1011
	1012	$res[$i] = array(
	1013	'table' => $case_func($tmp->table),
	1014	'name' => $case_func($tmp->name),
	1015	'type' => isset($this->mysqli_types[$tmp->type])
	1016	? $this->mysqli_types[$tmp->type]
	1017	: 'unknown',
	1018	'len' => $tmp->max_length,
	1019	'flags' => $flags,
	1020	);
	1021
	1022	if ($mode & DB_TABLEINFO_ORDER) {
	1023	$res['order'][$res[$i]['name']] = $i;
	1024	}
	1025	if ($mode & DB_TABLEINFO_ORDERTABLE) {
	1026	$res['ordertable'][$res[$i]['table']][$res[$i]['name']] = $i;
	1027	}
	1028	}
	1029
	1030	// free the result only if we were called on a table
	1031	if ($got_string) {
	1032	@mysqli_free_result($id);
	1033	}
	1034	return $res;
	1035	}
	1036
	1037	// }}}
	1038	// {{{ getSpecialQuery()
	1039
	1040	/**
	1041	* Obtains the query string needed for listing a given type of objects
	1042	*
	1043	* @param string $type the kind of objects you want to retrieve
	1044	*
	1045	* @return string the SQL query string or null if the driver doesn't
	1046	* support the object type requested
	1047	*
	1048	* @access protected
	1049	* @see DB_common::getListOf()
	1050	*/
	1051	function getSpecialQuery($type)
	1052	{
	1053	switch ($type) {
	1054	case 'tables':
	1055	return 'SHOW TABLES';
	1056	case 'users':
	1057	return 'SELECT DISTINCT User FROM mysql.user';
	1058	case 'databases':
	1059	return 'SHOW DATABASES';
	1060	default:
	1061	return null;
	1062	}
	1063	}
	1064
	1065	// }}}
	1066
	1067	}
	1068
	1069	/*
	1070	* Local variables:
	1071	* tab-width: 4
	1072	* c-basic-offset: 4
	1073	* End:
	1074	*/
	1075
	1076	?>