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Ticket #21359: wp-db.php

File wp-db.php, 45.1 KB (added by planetzuda, 12 years ago)
Wp-db.php with htmlentities() instead of htmlspecialchars()

Line
1	<?php
2	/**
3	* WordPress DB Class
4	*
5	* Original code from {@link http://php.justinvincent.com Justin Vincent (justin@visunet.ie)}
6	*
7	* @package WordPress
8	* @subpackage Database
9	* @since 0.71
10	*/
11
12	/**
13	* @since 0.71
14	*/
15	define( 'EZSQL_VERSION', 'WP1.25' );
16
17	/**
18	* @since 0.71
19	*/
20	define( 'OBJECT', 'OBJECT', true );
21
22	/**
23	* @since 2.5.0
24	*/
25	define( 'OBJECT_K', 'OBJECT_K' );
26
27	/**
28	* @since 0.71
29	*/
30	define( 'ARRAY_A', 'ARRAY_A' );
31
32	/**
33	* @since 0.71
34	*/
35	define( 'ARRAY_N', 'ARRAY_N' );
36
37	/**
38	* WordPress Database Access Abstraction Object
39	*
40	* It is possible to replace this class with your own
41	* by setting the $wpdb global variable in wp-content/db.php
42	* file to your class. The wpdb class will still be included,
43	* so you can extend it or simply use your own.
44	*
45	* @link http://codex.wordpress.org/Function_Reference/wpdb_Class
46	*
47	* @package WordPress
48	* @subpackage Database
49	* @since 0.71
50	*/
51	class wpdb {
52
53	/**
54	* Whether to show SQL/DB errors
55	*
56	* @since 0.71
57	* @access private
58	* @var bool
59	*/
60	var $show_errors = false;
61
62	/**
63	* Whether to suppress errors during the DB bootstrapping.
64	*
65	* @access private
66	* @since 2.5.0
67	* @var bool
68	*/
69	var $suppress_errors = false;
70
71	/**
72	* The last error during query.
73	*
74	* @since 2.5.0
75	* @var string
76	*/
77	var $last_error = '';
78
79	/**
80	* Amount of queries made
81	*
82	* @since 1.2.0
83	* @access private
84	* @var int
85	*/
86	var $num_queries = 0;
87
88	/**
89	* Count of rows returned by previous query
90	*
91	* @since 1.2.0
92	* @access private
93	* @var int
94	*/
95	var $num_rows = 0;
96
97	/**
98	* Count of affected rows by previous query
99	*
100	* @since 0.71
101	* @access private
102	* @var int
103	*/
104	var $rows_affected = 0;
105
106	/**
107	* The ID generated for an AUTO_INCREMENT column by the previous query (usually INSERT).
108	*
109	* @since 0.71
110	* @access public
111	* @var int
112	*/
113	var $insert_id = 0;
114
115	/**
116	* Saved result of the last query made
117	*
118	* @since 1.2.0
119	* @access private
120	* @var array
121	*/
122	var $last_query;
123
124	/**
125	* Results of the last query made
126	*
127	* @since 1.0.0
128	* @access private
129	* @var array\|null
130	*/
131	var $last_result;
132
133	/**
134	* Saved info on the table column
135	*
136	* @since 1.2.0
137	* @access private
138	* @var array
139	*/
140	var $col_info;
141
142	/**
143	* Saved queries that were executed
144	*
145	* @since 1.5.0
146	* @access private
147	* @var array
148	*/
149	var $queries;
150
151	/**
152	* WordPress table prefix
153	*
154	* You can set this to have multiple WordPress installations
155	* in a single database. The second reason is for possible
156	* security precautions.
157	*
158	* @since 0.71
159	* @access private
160	* @var string
161	*/
162	var $prefix = '';
163
164	/**
165	* Whether the database queries are ready to start executing.
166	*
167	* @since 2.5.0
168	* @access private
169	* @var bool
170	*/
171	var $ready = false;
172
173	/**
174	* {@internal Missing Description}}
175	*
176	* @since 3.0.0
177	* @access public
178	* @var int
179	*/
180	var $blogid = 0;
181
182	/**
183	* {@internal Missing Description}}
184	*
185	* @since 3.0.0
186	* @access public
187	* @var int
188	*/
189	var $siteid = 0;
190
191	/**
192	* List of WordPress per-blog tables
193	*
194	* @since 2.5.0
195	* @access private
196	* @see wpdb::tables()
197	* @var array
198	*/
199	var $tables = array( 'posts', 'comments', 'links', 'options', 'postmeta',
200	'terms', 'term_taxonomy', 'term_relationships', 'commentmeta' );
201
202	/**
203	* List of deprecated WordPress tables
204	*
205	* categories, post2cat, and link2cat were deprecated in 2.3.0, db version 5539
206	*
207	* @since 2.9.0
208	* @access private
209	* @see wpdb::tables()
210	* @var array
211	*/
212	var $old_tables = array( 'categories', 'post2cat', 'link2cat' );
213
214	/**
215	* List of WordPress global tables
216	*
217	* @since 3.0.0
218	* @access private
219	* @see wpdb::tables()
220	* @var array
221	*/
222	var $global_tables = array( 'users', 'usermeta' );
223
224	/**
225	* List of Multisite global tables
226	*
227	* @since 3.0.0
228	* @access private
229	* @see wpdb::tables()
230	* @var array
231	*/
232	var $ms_global_tables = array( 'blogs', 'signups', 'site', 'sitemeta',
233	'sitecategories', 'registration_log', 'blog_versions' );
234
235	/**
236	* WordPress Comments table
237	*
238	* @since 1.5.0
239	* @access public
240	* @var string
241	*/
242	var $comments;
243
244	/**
245	* WordPress Comment Metadata table
246	*
247	* @since 2.9.0
248	* @access public
249	* @var string
250	*/
251	var $commentmeta;
252
253	/**
254	* WordPress Links table
255	*
256	* @since 1.5.0
257	* @access public
258	* @var string
259	*/
260	var $links;
261
262	/**
263	* WordPress Options table
264	*
265	* @since 1.5.0
266	* @access public
267	* @var string
268	*/
269	var $options;
270
271	/**
272	* WordPress Post Metadata table
273	*
274	* @since 1.5.0
275	* @access public
276	* @var string
277	*/
278	var $postmeta;
279
280	/**
281	* WordPress Posts table
282	*
283	* @since 1.5.0
284	* @access public
285	* @var string
286	*/
287	var $posts;
288
289	/**
290	* WordPress Terms table
291	*
292	* @since 2.3.0
293	* @access public
294	* @var string
295	*/
296	var $terms;
297
298	/**
299	* WordPress Term Relationships table
300	*
301	* @since 2.3.0
302	* @access public
303	* @var string
304	*/
305	var $term_relationships;
306
307	/**
308	* WordPress Term Taxonomy table
309	*
310	* @since 2.3.0
311	* @access public
312	* @var string
313	*/
314	var $term_taxonomy;
315
316	/*
317	* Global and Multisite tables
318	*/
319
320	/**
321	* WordPress User Metadata table
322	*
323	* @since 2.3.0
324	* @access public
325	* @var string
326	*/
327	var $usermeta;
328
329	/**
330	* WordPress Users table
331	*
332	* @since 1.5.0
333	* @access public
334	* @var string
335	*/
336	var $users;
337
338	/**
339	* Multisite Blogs table
340	*
341	* @since 3.0.0
342	* @access public
343	* @var string
344	*/
345	var $blogs;
346
347	/**
348	* Multisite Blog Versions table
349	*
350	* @since 3.0.0
351	* @access public
352	* @var string
353	*/
354	var $blog_versions;
355
356	/**
357	* Multisite Registration Log table
358	*
359	* @since 3.0.0
360	* @access public
361	* @var string
362	*/
363	var $registration_log;
364
365	/**
366	* Multisite Signups table
367	*
368	* @since 3.0.0
369	* @access public
370	* @var string
371	*/
372	var $signups;
373
374	/**
375	* Multisite Sites table
376	*
377	* @since 3.0.0
378	* @access public
379	* @var string
380	*/
381	var $site;
382
383	/**
384	* Multisite Sitewide Terms table
385	*
386	* @since 3.0.0
387	* @access public
388	* @var string
389	*/
390	var $sitecategories;
391
392	/**
393	* Multisite Site Metadata table
394	*
395	* @since 3.0.0
396	* @access public
397	* @var string
398	*/
399	var $sitemeta;
400
401	/**
402	* Format specifiers for DB columns. Columns not listed here default to %s. Initialized during WP load.
403	*
404	* Keys are column names, values are format types: 'ID' => '%d'
405	*
406	* @since 2.8.0
407	* @see wpdb::prepare()
408	* @see wpdb::insert()
409	* @see wpdb::update()
410	* @see wpdb::delete()
411	* @see wp_set_wpdb_vars()
412	* @access public
413	* @var array
414	*/
415	var $field_types = array();
416
417	/**
418	* Database table columns charset
419	*
420	* @since 2.2.0
421	* @access public
422	* @var string
423	*/
424	var $charset;
425
426	/**
427	* Database table columns collate
428	*
429	* @since 2.2.0
430	* @access public
431	* @var string
432	*/
433	var $collate;
434
435	/**
436	* Whether to use mysql_real_escape_string
437	*
438	* @since 2.8.0
439	* @access public
440	* @var bool
441	*/
442	var $real_escape = false;
443
444	/**
445	* Database Username
446	*
447	* @since 2.9.0
448	* @access private
449	* @var string
450	*/
451	var $dbuser;
452
453	/**
454	* A textual description of the last query/get_row/get_var call
455	*
456	* @since 3.0.0
457	* @access public
458	* @var string
459	*/
460	var $func_call;
461
462	/**
463	* Whether MySQL is used as the database engine.
464	*
465	* Set in WPDB::db_connect() to true, by default. This is used when checking
466	* against the required MySQL version for WordPress. Normally, a replacement
467	* database drop-in (db.php) will skip these checks, but setting this to true
468	* will force the checks to occur.
469	*
470	* @since 3.3.0
471	* @access public
472	* @var bool
473	*/
474	public $is_mysql = null;
475
476	/**
477	* Connects to the database server and selects a database
478	*
479	* PHP5 style constructor for compatibility with PHP5. Does
480	* the actual setting up of the class properties and connection
481	* to the database.
482	*
483	* @link http://core.trac.wordpress.org/ticket/3354
484	* @since 2.0.8
485	*
486	* @param string $dbuser MySQL database user
487	* @param string $dbpassword MySQL database password
488	* @param string $dbname MySQL database name
489	* @param string $dbhost MySQL database host
490	*/
491	function __construct( $dbuser, $dbpassword, $dbname, $dbhost ) {
492	register_shutdown_function( array( &$this, '__destruct' ) );
493
494	if ( WP_DEBUG )
495	$this->show_errors();
496
497	$this->init_charset();
498
499	$this->dbuser = $dbuser;
500	$this->dbpassword = $dbpassword;
501	$this->dbname = $dbname;
502	$this->dbhost = $dbhost;
503
504	$this->db_connect();
505	}
506
507	/**
508	* PHP5 style destructor and will run when database object is destroyed.
509	*
510	* @see wpdb::__construct()
511	* @since 2.0.8
512	* @return bool true
513	*/
514	function __destruct() {
515	return true;
516	}
517
518	/**
519	* Set $this->charset and $this->collate
520	*
521	* @since 3.1.0
522	*/
523	function init_charset() {
524	if ( function_exists('is_multisite') && is_multisite() ) {
525	$this->charset = 'utf8';
526	if ( defined( 'DB_COLLATE' ) && DB_COLLATE )
527	$this->collate = DB_COLLATE;
528	else
529	$this->collate = 'utf8_general_ci';
530	} elseif ( defined( 'DB_COLLATE' ) ) {
531	$this->collate = DB_COLLATE;
532	}
533
534	if ( defined( 'DB_CHARSET' ) )
535	$this->charset = DB_CHARSET;
536	}
537
538	/**
539	* Sets the connection's character set.
540	*
541	* @since 3.1.0
542	*
543	* @param resource $dbh The resource given by mysql_connect
544	* @param string $charset The character set (optional)
545	* @param string $collate The collation (optional)
546	*/
547	function set_charset($dbh, $charset = null, $collate = null) {
548	if ( !isset($charset) )
549	$charset = $this->charset;
550	if ( !isset($collate) )
551	$collate = $this->collate;
552	if ( $this->has_cap( 'collation', $dbh ) && !empty( $charset ) ) {
553	if ( function_exists( 'mysql_set_charset' ) && $this->has_cap( 'set_charset', $dbh ) ) {
554	mysql_set_charset( $charset, $dbh );
555	$this->real_escape = true;
556	} else {
557	$query = $this->prepare( 'SET NAMES %s', $charset );
558	if ( ! empty( $collate ) )
559	$query .= $this->prepare( ' COLLATE %s', $collate );
560	mysql_query( $query, $dbh );
561	}
562	}
563	}
564
565	/**
566	* Sets the table prefix for the WordPress tables.
567	*
568	* @since 2.5.0
569	*
570	* @param string $prefix Alphanumeric name for the new prefix.
571	* @param bool $set_table_names Optional. Whether the table names, e.g. wpdb::$posts, should be updated or not.
572	* @return string\|WP_Error Old prefix or WP_Error on error
573	*/
574	function set_prefix( $prefix, $set_table_names = true ) {
575
576	if ( preg_match( '\|[^a-z0-9_]\|i', $prefix ) )
577	return new WP_Error('invalid_db_prefix', 'Invalid database prefix' );
578
579	$old_prefix = is_multisite() ? '' : $prefix;
580
581	if ( isset( $this->base_prefix ) )
582	$old_prefix = $this->base_prefix;
583
584	$this->base_prefix = $prefix;
585
586	if ( $set_table_names ) {
587	foreach ( $this->tables( 'global' ) as $table => $prefixed_table )
588	$this->$table = $prefixed_table;
589
590	if ( is_multisite() && empty( $this->blogid ) )
591	return $old_prefix;
592
593	$this->prefix = $this->get_blog_prefix();
594
595	foreach ( $this->tables( 'blog' ) as $table => $prefixed_table )
596	$this->$table = $prefixed_table;
597
598	foreach ( $this->tables( 'old' ) as $table => $prefixed_table )
599	$this->$table = $prefixed_table;
600	}
601	return $old_prefix;
602	}
603
604	/**
605	* Sets blog id.
606	*
607	* @since 3.0.0
608	* @access public
609	* @param int $blog_id
610	* @param int $site_id Optional.
611	* @return string previous blog id
612	*/
613	function set_blog_id( $blog_id, $site_id = 0 ) {
614	if ( ! empty( $site_id ) )
615	$this->siteid = $site_id;
616
617	$old_blog_id = $this->blogid;
618	$this->blogid = $blog_id;
619
620	$this->prefix = $this->get_blog_prefix();
621
622	foreach ( $this->tables( 'blog' ) as $table => $prefixed_table )
623	$this->$table = $prefixed_table;
624
625	foreach ( $this->tables( 'old' ) as $table => $prefixed_table )
626	$this->$table = $prefixed_table;
627
628	return $old_blog_id;
629	}
630
631	/**
632	* Gets blog prefix.
633	*
634	* @uses is_multisite()
635	* @since 3.0.0
636	* @param int $blog_id Optional.
637	* @return string Blog prefix.
638	*/
639	function get_blog_prefix( $blog_id = null ) {
640	if ( is_multisite() ) {
641	if ( null === $blog_id )
642	$blog_id = $this->blogid;
643	$blog_id = (int) $blog_id;
644	if ( defined( 'MULTISITE' ) && ( 0 == $blog_id \|\| 1 == $blog_id ) )
645	return $this->base_prefix;
646	else
647	return $this->base_prefix . $blog_id . '_';
648	} else {
649	return $this->base_prefix;
650	}
651	}
652
653	/**
654	* Returns an array of WordPress tables.
655	*
656	* Also allows for the CUSTOM_USER_TABLE and CUSTOM_USER_META_TABLE to
657	* override the WordPress users and usermeta tables that would otherwise
658	* be determined by the prefix.
659	*
660	* The scope argument can take one of the following:
661	*
662	* 'all' - returns 'all' and 'global' tables. No old tables are returned.
663	* 'blog' - returns the blog-level tables for the queried blog.
664	* 'global' - returns the global tables for the installation, returning multisite tables only if running multisite.
665	* 'ms_global' - returns the multisite global tables, regardless if current installation is multisite.
666	* 'old' - returns tables which are deprecated.
667	*
668	* @since 3.0.0
669	* @uses wpdb::$tables
670	* @uses wpdb::$old_tables
671	* @uses wpdb::$global_tables
672	* @uses wpdb::$ms_global_tables
673	* @uses is_multisite()
674	*
675	* @param string $scope Optional. Can be all, global, ms_global, blog, or old tables. Defaults to all.
676	* @param bool $prefix Optional. Whether to include table prefixes. Default true. If blog
677	* prefix is requested, then the custom users and usermeta tables will be mapped.
678	* @param int $blog_id Optional. The blog_id to prefix. Defaults to wpdb::$blogid. Used only when prefix is requested.
679	* @return array Table names. When a prefix is requested, the key is the unprefixed table name.
680	*/
681	function tables( $scope = 'all', $prefix = true, $blog_id = 0 ) {
682	switch ( $scope ) {
683	case 'all' :
684	$tables = array_merge( $this->global_tables, $this->tables );
685	if ( is_multisite() )
686	$tables = array_merge( $tables, $this->ms_global_tables );
687	break;
688	case 'blog' :
689	$tables = $this->tables;
690	break;
691	case 'global' :
692	$tables = $this->global_tables;
693	if ( is_multisite() )
694	$tables = array_merge( $tables, $this->ms_global_tables );
695	break;
696	case 'ms_global' :
697	$tables = $this->ms_global_tables;
698	break;
699	case 'old' :
700	$tables = $this->old_tables;
701	break;
702	default :
703	return array();
704	break;
705	}
706
707	if ( $prefix ) {
708	if ( ! $blog_id )
709	$blog_id = $this->blogid;
710	$blog_prefix = $this->get_blog_prefix( $blog_id );
711	$base_prefix = $this->base_prefix;
712	$global_tables = array_merge( $this->global_tables, $this->ms_global_tables );
713	foreach ( $tables as $k => $table ) {
714	if ( in_array( $table, $global_tables ) )
715	$tables[ $table ] = $base_prefix . $table;
716	else
717	$tables[ $table ] = $blog_prefix . $table;
718	unset( $tables[ $k ] );
719	}
720
721	if ( isset( $tables['users'] ) && defined( 'CUSTOM_USER_TABLE' ) )
722	$tables['users'] = CUSTOM_USER_TABLE;
723
724	if ( isset( $tables['usermeta'] ) && defined( 'CUSTOM_USER_META_TABLE' ) )
725	$tables['usermeta'] = CUSTOM_USER_META_TABLE;
726	}
727
728	return $tables;
729	}
730
731	/**
732	* Selects a database using the current database connection.
733	*
734	* The database name will be changed based on the current database
735	* connection. On failure, the execution will bail and display an DB error.
736	*
737	* @since 0.71
738	*
739	* @param string $db MySQL database name
740	* @param resource $dbh Optional link identifier.
741	* @return null Always null.
742	*/
743	function select( $db, $dbh = null ) {
744	if ( is_null($dbh) )
745	$dbh = $this->dbh;
746
747	if ( !@mysql_select_db( $db, $dbh ) ) {
748	$this->ready = false;
749	wp_load_translations_early();
750	$this->bail( sprintf( __( '<h1>Can’t select database</h1>
751	<p>We were able to connect to the database server (which means your username and password is okay) but not able to select the <code>%1$s</code> database.</p>
752	<ul>
753	<li>Are you sure it exists?</li>
754	<li>Does the user <code>%2$s</code> have permission to use the <code>%1$s</code> database?</li>
755	<li>On some systems the name of your database is prefixed with your username, so it would be like <code>username_%1$s</code>. Could that be the problem?</li>
756	</ul>
757	<p>If you don\'t know how to set up a database you should <strong>contact your host</strong>. If all else fails you may find help at the <a href="http://wordpress.org/support/">WordPress Support Forums</a>.</p>' ), htmlentities( $db, ENT_QUOTES ), htmlentities( $this->dbuser, ENT_QUOTES ) ), 'db_select_fail' );
758	return;
759	}
760	}
761
762	/**
763	* Weak escape, using addslashes()
764	*
765	* @see addslashes()
766	* @since 2.8.0
767	* @access private
768	*
769	* @param string $string
770	* @return string
771	*/
772	function _weak_escape( $string ) {
773	return addslashes( $string );
774	}
775
776	/**
777	* Real escape, using mysql_real_escape_string() or addslashes()
778	*
779	* @see mysql_real_escape_string()
780	* @see addslashes()
781	* @since 2.8.0
782	* @access private
783	*
784	* @param string $string to escape
785	* @return string escaped
786	*/
787	function _real_escape( $string ) {
788	if ( $this->dbh && $this->real_escape )
789	return mysql_real_escape_string( $string, $this->dbh );
790	else
791	return addslashes( $string );
792	}
793
794	/**
795	* Escape data. Works on arrays.
796	*
797	* @uses wpdb::_escape()
798	* @uses wpdb::_real_escape()
799	* @since 2.8.0
800	* @access private
801	*
802	* @param string\|array $data
803	* @return string\|array escaped
804	*/
805	function _escape( $data ) {
806	if ( is_array( $data ) ) {
807	foreach ( (array) $data as $k => $v ) {
808	if ( is_array($v) )
809	$data[$k] = $this->_escape( $v );
810	else
811	$data[$k] = $this->_real_escape( $v );
812	}
813	} else {
814	$data = $this->_real_escape( $data );
815	}
816
817	return $data;
818	}
819
820	/**
821	* Escapes content for insertion into the database using addslashes(), for security.
822	*
823	* Works on arrays.
824	*
825	* @since 0.71
826	* @param string\|array $data to escape
827	* @return string\|array escaped as query safe string
828	*/
829	function escape( $data ) {
830	if ( is_array( $data ) ) {
831	foreach ( (array) $data as $k => $v ) {
832	if ( is_array( $v ) )
833	$data[$k] = $this->escape( $v );
834	else
835	$data[$k] = $this->_weak_escape( $v );
836	}
837	} else {
838	$data = $this->_weak_escape( $data );
839	}
840
841	return $data;
842	}
843
844	/**
845	* Escapes content by reference for insertion into the database, for security
846	*
847	* @uses wpdb::_real_escape()
848	* @since 2.3.0
849	* @param string $string to escape
850	* @return void
851	*/
852	function escape_by_ref( &$string ) {
853	$string = $this->_real_escape( $string );
854	}
855
856	/**
857	* Prepares a SQL query for safe execution. Uses sprintf()-like syntax.
858	*
859	* The following directives can be used in the query format string:
860	* %d (integer)
861	* %f (float)
862	* %s (string)
863	* %% (literal percentage sign - no argument needed)
864	*
865	* All of %d, %f, and %s are to be left unquoted in the query string and they need an argument passed for them.
866	* Literals (%) as parts of the query must be properly written as %%.
867	*
868	* This function only supports a small subset of the sprintf syntax; it only supports %d (integer), %f (float), and %s (string).
869	* Does not support sign, padding, alignment, width or precision specifiers.
870	* Does not support argument numbering/swapping.
871	*
872	* May be called like {@link http://php.net/sprintf sprintf()} or like {@link http://php.net/vsprintf vsprintf()}.
873	*
874	* Both %d and %s should be left unquoted in the query string.
875	*
876	* <code>
877	* wpdb::prepare( "SELECT * FROM `table` WHERE `column` = %s AND `field` = %d", 'foo', 1337 )
878	* wpdb::prepare( "SELECT DATE_FORMAT(`field`, '%%c') FROM `table` WHERE `column` = %s", 'foo' );
879	* </code>
880	*
881	* @link http://php.net/sprintf Description of syntax.
882	* @since 2.3.0
883	*
884	* @param string $query Query statement with sprintf()-like placeholders
885	* @param array\|mixed $args The array of variables to substitute into the query's placeholders if being called like
886	* {@link http://php.net/vsprintf vsprintf()}, or the first variable to substitute into the query's placeholders if
887	* being called like {@link http://php.net/sprintf sprintf()}.
888	* @param mixed $args,... further variables to substitute into the query's placeholders if being called like
889	* {@link http://php.net/sprintf sprintf()}.
890	* @return null\|false\|string Sanitized query string, null if there is no query, false if there is an error and string
891	* if there was something to prepare
892	*/
893	function prepare( $query = null ) { // ( $query, *$args )
894	if ( is_null( $query ) )
895	return;
896
897	$args = func_get_args();
898	array_shift( $args );
899	// If args were passed as an array (as in vsprintf), move them up
900	if ( isset( $args[0] ) && is_array($args[0]) )
901	$args = $args[0];
902	$query = str_replace( "'%s'", '%s', $query ); // in case someone mistakenly already singlequoted it
903	$query = str_replace( '"%s"', '%s', $query ); // doublequote unquoting
904	$query = preg_replace( '\|(?<!%)%s\|', "'%s'", $query ); // quote the strings, avoiding escaped strings like %%s
905	array_walk( $args, array( &$this, 'escape_by_ref' ) );
906	return @vsprintf( $query, $args );
907	}
908
909	/**
910	* Print SQL/DB error.
911	*
912	* @since 0.71
913	* @global array $EZSQL_ERROR Stores error information of query and error string
914	*
915	* @param string $str The error to display
916	* @return bool False if the showing of errors is disabled.
917	*/
918	function print_error( $str = '' ) {
919	global $EZSQL_ERROR;
920
921	if ( !$str )
922	$str = mysql_error( $this->dbh );
923	$EZSQL_ERROR[] = array( 'query' => $this->last_query, 'error_str' => $str );
924
925	if ( $this->suppress_errors )
926	return false;
927
928	wp_load_translations_early();
929
930	if ( $caller = $this->get_caller() )
931	$error_str = sprintf( __( 'WordPress database error %1$s for query %2$s made by %3$s' ), $str, $this->last_query, $caller );
932	else
933	$error_str = sprintf( __( 'WordPress database error %1$s for query %2$s' ), $str, $this->last_query );
934
935	if ( function_exists( 'error_log' )
936	&& ( $log_file = @ini_get( 'error_log' ) )
937	&& ( 'syslog' == $log_file \|\| @is_writable( $log_file ) )
938	)
939	@error_log( $error_str );
940
941	// Are we showing errors?
942	if ( ! $this->show_errors )
943	return false;
944
945	// If there is an error then take note of it
946	if ( is_multisite() ) {
947	$msg = "WordPress database error: [$str]\n{$this->last_query}\n";
948	if ( defined( 'ERRORLOGFILE' ) )
949	error_log( $msg, 3, ERRORLOGFILE );
950	if ( defined( 'DIEONDBERROR' ) )
951	wp_die( $msg );
952	} else {
953	$str = htmlentities( $str, ENT_QUOTES );
954	$query = htmlentities( $this->last_query, ENT_QUOTES );
955
956	print "<div id='error'>
957	<p class='wpdberror'><strong>WordPress database error:</strong> [$str]<br />
958	<code>$query</code></p>
959	</div>";
960	}
961	}
962
963	/**
964	* Enables showing of database errors.
965	*
966	* This function should be used only to enable showing of errors.
967	* wpdb::hide_errors() should be used instead for hiding of errors. However,
968	* this function can be used to enable and disable showing of database
969	* errors.
970	*
971	* @since 0.71
972	* @see wpdb::hide_errors()
973	*
974	* @param bool $show Whether to show or hide errors
975	* @return bool Old value for showing errors.
976	*/
977	function show_errors( $show = true ) {
978	$errors = $this->show_errors;
979	$this->show_errors = $show;
980	return $errors;
981	}
982
983	/**
984	* Disables showing of database errors.
985	*
986	* By default database errors are not shown.
987	*
988	* @since 0.71
989	* @see wpdb::show_errors()
990	*
991	* @return bool Whether showing of errors was active
992	*/
993	function hide_errors() {
994	$show = $this->show_errors;
995	$this->show_errors = false;
996	return $show;
997	}
998
999	/**
1000	* Whether to suppress database errors.
1001	*
1002	* By default database errors are suppressed, with a simple
1003	* call to this function they can be enabled.
1004	*
1005	* @since 2.5.0
1006	* @see wpdb::hide_errors()
1007	* @param bool $suppress Optional. New value. Defaults to true.
1008	* @return bool Old value
1009	*/
1010	function suppress_errors( $suppress = true ) {
1011	$errors = $this->suppress_errors;
1012	$this->suppress_errors = (bool) $suppress;
1013	return $errors;
1014	}
1015
1016	/**
1017	* Kill cached query results.
1018	*
1019	* @since 0.71
1020	* @return void
1021	*/
1022	function flush() {
1023	$this->last_result = array();
1024	$this->col_info = null;
1025	$this->last_query = null;
1026	}
1027
1028	/**
1029	* Connect to and select database
1030	*
1031	* @since 3.0.0
1032	*/
1033	function db_connect() {
1034
1035	$this->is_mysql = true;
1036
1037	if ( WP_DEBUG ) {
1038	$this->dbh = mysql_connect( $this->dbhost, $this->dbuser, $this->dbpassword, true );
1039	} else {
1040	$this->dbh = @mysql_connect( $this->dbhost, $this->dbuser, $this->dbpassword, true );
1041	}
1042
1043	if ( !$this->dbh ) {
1044	wp_load_translations_early();
1045	$this->bail( sprintf( __( "
1046	<h1>Error establishing a database connection</h1>
1047	<p>This either means that the username and password information in your <code>wp-config.php</code> file is incorrect or we can't contact the database server at <code>%s</code>. This could mean your host's database server is down.</p>
1048	<ul>
1049	<li>Are you sure you have the correct username and password?</li>
1050	<li>Are you sure that you have typed the correct hostname?</li>
1051	<li>Are you sure that the database server is running?</li>
1052	</ul>
1053	<p>If you're unsure what these terms mean you should probably contact your host. If you still need help you can always visit the <a href='http://wordpress.org/support/'>WordPress Support Forums</a>.</p>
1054	" ), htmlentities( $this->dbhost, ENT_QUOTES ) ), 'db_connect_fail' );
1055
1056	return;
1057	}
1058
1059	$this->set_charset( $this->dbh );
1060
1061	$this->ready = true;
1062
1063	$this->select( $this->dbname, $this->dbh );
1064	}
1065
1066	/**
1067	* Perform a MySQL database query, using current database connection.
1068	*
1069	* More information can be found on the codex page.
1070	*
1071	* @since 0.71
1072	*
1073	* @param string $query Database query
1074	* @return int\|false Number of rows affected/selected or false on error
1075	*/
1076	function query( $query ) {
1077	if ( ! $this->ready )
1078	return false;
1079
1080	// some queries are made before the plugins have been loaded, and thus cannot be filtered with this method
1081	$query = apply_filters( 'query', $query );
1082
1083	$return_val = 0;
1084	$this->flush();
1085
1086	// Log how the function was called
1087	$this->func_call = "\$db->query(\"$query\")";
1088
1089	// Keep track of the last query for debug..
1090	$this->last_query = $query;
1091
1092	if ( defined( 'SAVEQUERIES' ) && SAVEQUERIES )
1093	$this->timer_start();
1094
1095	$this->result = @mysql_query( $query, $this->dbh );
1096	$this->num_queries++;
1097
1098	if ( defined( 'SAVEQUERIES' ) && SAVEQUERIES )
1099	$this->queries[] = array( $query, $this->timer_stop(), $this->get_caller() );
1100
1101	// If there is an error then take note of it..
1102	if ( $this->last_error = mysql_error( $this->dbh ) ) {
1103	$this->print_error();
1104	return false;
1105	}
1106
1107	if ( preg_match( '/^\s*(create\|alter\|truncate\|drop) /i', $query ) ) {
1108	$return_val = $this->result;
1109	} elseif ( preg_match( '/^\s*(insert\|delete\|update\|replace) /i', $query ) ) {
1110	$this->rows_affected = mysql_affected_rows( $this->dbh );
1111	// Take note of the insert_id
1112	if ( preg_match( '/^\s*(insert\|replace) /i', $query ) ) {
1113	$this->insert_id = mysql_insert_id($this->dbh);
1114	}
1115	// Return number of rows affected
1116	$return_val = $this->rows_affected;
1117	} else {
1118	$i = 0;
1119	while ( $i < @mysql_num_fields( $this->result ) ) {
1120	$this->col_info[$i] = @mysql_fetch_field( $this->result );
1121	$i++;
1122	}
1123	$num_rows = 0;
1124	while ( $row = @mysql_fetch_object( $this->result ) ) {
1125	$this->last_result[$num_rows] = $row;
1126	$num_rows++;
1127	}
1128
1129	@mysql_free_result( $this->result );
1130
1131	// Log number of rows the query returned
1132	// and return number of rows selected
1133	$this->num_rows = $num_rows;
1134	$return_val = $num_rows;
1135	}
1136
1137	return $return_val;
1138	}
1139
1140	/**
1141	* Insert a row into a table.
1142	*
1143	* <code>
1144	* wpdb::insert( 'table', array( 'column' => 'foo', 'field' => 'bar' ) )
1145	* wpdb::insert( 'table', array( 'column' => 'foo', 'field' => 1337 ), array( '%s', '%d' ) )
1146	* </code>
1147	*
1148	* @since 2.5.0
1149	* @see wpdb::prepare()
1150	* @see wpdb::$field_types
1151	* @see wp_set_wpdb_vars()
1152	*
1153	* @param string $table table name
1154	* @param array $data Data to insert (in column => value pairs). Both $data columns and $data values should be "raw" (neither should be SQL escaped).
1155	* @param array\|string $format Optional. An array of formats to be mapped to each of the value in $data. If string, that format will be used for all of the values in $data.
1156	* A format is one of '%d', '%f', '%s' (integer, float, string). If omitted, all values in $data will be treated as strings unless otherwise specified in wpdb::$field_types.
1157	* @return int\|false The number of rows inserted, or false on error.
1158	*/
1159	function insert( $table, $data, $format = null ) {
1160	return $this->_insert_replace_helper( $table, $data, $format, 'INSERT' );
1161	}
1162
1163	/**
1164	* Replace a row into a table.
1165	*
1166	* <code>
1167	* wpdb::replace( 'table', array( 'column' => 'foo', 'field' => 'bar' ) )
1168	* wpdb::replace( 'table', array( 'column' => 'foo', 'field' => 1337 ), array( '%s', '%d' ) )
1169	* </code>
1170	*
1171	* @since 3.0.0
1172	* @see wpdb::prepare()
1173	* @see wpdb::$field_types
1174	* @see wp_set_wpdb_vars()
1175	*
1176	* @param string $table table name
1177	* @param array $data Data to insert (in column => value pairs). Both $data columns and $data values should be "raw" (neither should be SQL escaped).
1178	* @param array\|string $format Optional. An array of formats to be mapped to each of the value in $data. If string, that format will be used for all of the values in $data.
1179	* A format is one of '%d', '%f', '%s' (integer, float, string). If omitted, all values in $data will be treated as strings unless otherwise specified in wpdb::$field_types.
1180	* @return int\|false The number of rows affected, or false on error.
1181	*/
1182	function replace( $table, $data, $format = null ) {
1183	return $this->_insert_replace_helper( $table, $data, $format, 'REPLACE' );
1184	}
1185
1186	/**
1187	* Helper function for insert and replace.
1188	*
1189	* Runs an insert or replace query based on $type argument.
1190	*
1191	* @access private
1192	* @since 3.0.0
1193	* @see wpdb::prepare()
1194	* @see wpdb::$field_types
1195	* @see wp_set_wpdb_vars()
1196	*
1197	* @param string $table table name
1198	* @param array $data Data to insert (in column => value pairs). Both $data columns and $data values should be "raw" (neither should be SQL escaped).
1199	* @param array\|string $format Optional. An array of formats to be mapped to each of the value in $data. If string, that format will be used for all of the values in $data.
1200	* A format is one of '%d', '%f', '%s' (integer, float, string). If omitted, all values in $data will be treated as strings unless otherwise specified in wpdb::$field_types.
1201	* @param string $type Optional. What type of operation is this? INSERT or REPLACE. Defaults to INSERT.
1202	* @return int\|false The number of rows affected, or false on error.
1203	*/
1204	function _insert_replace_helper( $table, $data, $format = null, $type = 'INSERT' ) {
1205	if ( ! in_array( strtoupper( $type ), array( 'REPLACE', 'INSERT' ) ) )
1206	return false;
1207	$formats = $format = (array) $format;
1208	$fields = array_keys( $data );
1209	$formatted_fields = array();
1210	foreach ( $fields as $field ) {
1211	if ( !empty( $format ) )
1212	$form = ( $form = array_shift( $formats ) ) ? $form : $format[0];
1213	elseif ( isset( $this->field_types[$field] ) )
1214	$form = $this->field_types[$field];
1215	else
1216	$form = '%s';
1217	$formatted_fields[] = $form;
1218	}
1219	$sql = "{$type} INTO `$table` (`" . implode( '`,`', $fields ) . "`) VALUES (" . implode( ",", $formatted_fields ) . ")";
1220	return $this->query( $this->prepare( $sql, $data ) );
1221	}
1222
1223	/**
1224	* Update a row in the table
1225	*
1226	* <code>
1227	* wpdb::update( 'table', array( 'column' => 'foo', 'field' => 'bar' ), array( 'ID' => 1 ) )
1228	* wpdb::update( 'table', array( 'column' => 'foo', 'field' => 1337 ), array( 'ID' => 1 ), array( '%s', '%d' ), array( '%d' ) )
1229	* </code>
1230	*
1231	* @since 2.5.0
1232	* @see wpdb::prepare()
1233	* @see wpdb::$field_types
1234	* @see wp_set_wpdb_vars()
1235	*
1236	* @param string $table table name
1237	* @param array $data Data to update (in column => value pairs). Both $data columns and $data values should be "raw" (neither should be SQL escaped).
1238	* @param array $where A named array of WHERE clauses (in column => value pairs). Multiple clauses will be joined with ANDs. Both $where columns and $where values should be "raw".
1239	* @param array\|string $format Optional. An array of formats to be mapped to each of the values in $data. If string, that format will be used for all of the values in $data.
1240	* A format is one of '%d', '%f', '%s' (integer, float, string). If omitted, all values in $data will be treated as strings unless otherwise specified in wpdb::$field_types.
1241	* @param array\|string $where_format Optional. An array of formats to be mapped to each of the values in $where. If string, that format will be used for all of the items in $where. A format is one of '%d', '%f', '%s' (integer, float, string). If omitted, all values in $where will be treated as strings.
1242	* @return int\|false The number of rows updated, or false on error.
1243	*/
1244	function update( $table, $data, $where, $format = null, $where_format = null ) {
1245	if ( ! is_array( $data ) \|\| ! is_array( $where ) )
1246	return false;
1247
1248	$formats = $format = (array) $format;
1249	$bits = $wheres = array();
1250	foreach ( (array) array_keys( $data ) as $field ) {
1251	if ( !empty( $format ) )
1252	$form = ( $form = array_shift( $formats ) ) ? $form : $format[0];
1253	elseif ( isset($this->field_types[$field]) )
1254	$form = $this->field_types[$field];
1255	else
1256	$form = '%s';
1257	$bits[] = "`$field` = {$form}";
1258	}
1259
1260	$where_formats = $where_format = (array) $where_format;
1261	foreach ( (array) array_keys( $where ) as $field ) {
1262	if ( !empty( $where_format ) )
1263	$form = ( $form = array_shift( $where_formats ) ) ? $form : $where_format[0];
1264	elseif ( isset( $this->field_types[$field] ) )
1265	$form = $this->field_types[$field];
1266	else
1267	$form = '%s';
1268	$wheres[] = "`$field` = {$form}";
1269	}
1270
1271	$sql = "UPDATE `$table` SET " . implode( ', ', $bits ) . ' WHERE ' . implode( ' AND ', $wheres );
1272	return $this->query( $this->prepare( $sql, array_merge( array_values( $data ), array_values( $where ) ) ) );
1273	}
1274
1275	/**
1276	* Delete a row in the table
1277	*
1278	* <code>
1279	* wpdb::delete( 'table', array( 'ID' => 1 ) )
1280	* wpdb::delete( 'table', array( 'ID' => 1 ), array( '%d' ) )
1281	* </code>
1282	*
1283	* @since 3.4.0
1284	* @see wpdb::prepare()
1285	* @see wpdb::$field_types
1286	* @see wp_set_wpdb_vars()
1287	*
1288	* @param string $table table name
1289	* @param array $where A named array of WHERE clauses (in column => value pairs). Multiple clauses will be joined with ANDs. Both $where columns and $where values should be "raw".
1290	* @param array\|string $where_format Optional. An array of formats to be mapped to each of the values in $where. If string, that format will be used for all of the items in $where. A format is one of '%d', '%f', '%s' (integer, float, string). If omitted, all values in $where will be treated as strings unless otherwise specified in wpdb::$field_types.
1291	* @return int\|false The number of rows updated, or false on error.
1292	*/
1293	function delete( $table, $where, $where_format = null ) {
1294	if ( ! is_array( $where ) )
1295	return false;
1296
1297	$bits = $wheres = array();
1298
1299	$where_formats = $where_format = (array) $where_format;
1300
1301	foreach ( array_keys( $where ) as $field ) {
1302	if ( !empty( $where_format ) ) {
1303	$form = ( $form = array_shift( $where_formats ) ) ? $form : $where_format[0];
1304	} elseif ( isset( $this->field_types[ $field ] ) ) {
1305	$form = $this->field_types[ $field ];
1306	} else {
1307	$form = '%s';
1308	}
1309
1310	$wheres[] = "$field = $form";
1311	}
1312
1313	$sql = "DELETE FROM $table WHERE " . implode( ' AND ', $wheres );
1314	return $this->query( $this->prepare( $sql, $where ) );
1315	}
1316
1317
1318	/**
1319	* Retrieve one variable from the database.
1320	*
1321	* Executes a SQL query and returns the value from the SQL result.
1322	* If the SQL result contains more than one column and/or more than one row, this function returns the value in the column and row specified.
1323	* If $query is null, this function returns the value in the specified column and row from the previous SQL result.
1324	*
1325	* @since 0.71
1326	*
1327	* @param string\|null $query Optional. SQL query. Defaults to null, use the result from the previous query.
1328	* @param int $x Optional. Column of value to return. Indexed from 0.
1329	* @param int $y Optional. Row of value to return. Indexed from 0.
1330	* @return string\|null Database query result (as string), or null on failure
1331	*/
1332	function get_var( $query = null, $x = 0, $y = 0 ) {
1333	$this->func_call = "\$db->get_var(\"$query\", $x, $y)";
1334	if ( $query )
1335	$this->query( $query );
1336
1337	// Extract var out of cached results based x,y vals
1338	if ( !empty( $this->last_result[$y] ) ) {
1339	$values = array_values( get_object_vars( $this->last_result[$y] ) );
1340	}
1341
1342	// If there is a value return it else return null
1343	return ( isset( $values[$x] ) && $values[$x] !== '' ) ? $values[$x] : null;
1344	}
1345
1346	/**
1347	* Retrieve one row from the database.
1348	*
1349	* Executes a SQL query and returns the row from the SQL result.
1350	*
1351	* @since 0.71
1352	*
1353	* @param string\|null $query SQL query.
1354	* @param string $output Optional. one of ARRAY_A \| ARRAY_N \| OBJECT constants. Return an associative array (column => value, ...),
1355	* a numerically indexed array (0 => value, ...) or an object ( ->column = value ), respectively.
1356	* @param int $y Optional. Row to return. Indexed from 0.
1357	* @return mixed Database query result in format specified by $output or null on failure
1358	*/
1359	function get_row( $query = null, $output = OBJECT, $y = 0 ) {
1360	$this->func_call = "\$db->get_row(\"$query\",$output,$y)";
1361	if ( $query )
1362	$this->query( $query );
1363	else
1364	return null;
1365
1366	if ( !isset( $this->last_result[$y] ) )
1367	return null;
1368
1369	if ( $output == OBJECT ) {
1370	return $this->last_result[$y] ? $this->last_result[$y] : null;
1371	} elseif ( $output == ARRAY_A ) {
1372	return $this->last_result[$y] ? get_object_vars( $this->last_result[$y] ) : null;
1373	} elseif ( $output == ARRAY_N ) {
1374	return $this->last_result[$y] ? array_values( get_object_vars( $this->last_result[$y] ) ) : null;
1375	} else {
1376	$this->print_error( " \$db->get_row(string query, output type, int offset) -- Output type must be one of: OBJECT, ARRAY_A, ARRAY_N" );
1377	}
1378	}
1379
1380	/**
1381	* Retrieve one column from the database.
1382	*
1383	* Executes a SQL query and returns the column from the SQL result.
1384	* If the SQL result contains more than one column, this function returns the column specified.
1385	* If $query is null, this function returns the specified column from the previous SQL result.
1386	*
1387	* @since 0.71
1388	*
1389	* @param string\|null $query Optional. SQL query. Defaults to previous query.
1390	* @param int $x Optional. Column to return. Indexed from 0.
1391	* @return array Database query result. Array indexed from 0 by SQL result row number.
1392	*/
1393	function get_col( $query = null , $x = 0 ) {
1394	if ( $query )
1395	$this->query( $query );
1396
1397	$new_array = array();
1398	// Extract the column values
1399	for ( $i = 0, $j = count( $this->last_result ); $i < $j; $i++ ) {
1400	$new_array[$i] = $this->get_var( null, $x, $i );
1401	}
1402	return $new_array;
1403	}
1404
1405	/**
1406	* Retrieve an entire SQL result set from the database (i.e., many rows)
1407	*
1408	* Executes a SQL query and returns the entire SQL result.
1409	*
1410	* @since 0.71
1411	*
1412	* @param string $query SQL query.
1413	* @param string $output Optional. Any of ARRAY_A \| ARRAY_N \| OBJECT \| OBJECT_K constants. With one of the first three, return an array of rows indexed from 0 by SQL result row number.
1414	* Each row is an associative array (column => value, ...), a numerically indexed array (0 => value, ...), or an object. ( ->column = value ), respectively.
1415	* With OBJECT_K, return an associative array of row objects keyed by the value of each row's first column's value. Duplicate keys are discarded.
1416	* @return mixed Database query results
1417	*/
1418	function get_results( $query = null, $output = OBJECT ) {
1419	$this->func_call = "\$db->get_results(\"$query\", $output)";
1420
1421	if ( $query )
1422	$this->query( $query );
1423	else
1424	return null;
1425
1426	$new_array = array();
1427	if ( $output == OBJECT ) {
1428	// Return an integer-keyed array of row objects
1429	return $this->last_result;
1430	} elseif ( $output == OBJECT_K ) {
1431	// Return an array of row objects with keys from column 1
1432	// (Duplicates are discarded)
1433	foreach ( $this->last_result as $row ) {
1434	$var_by_ref = get_object_vars( $row );
1435	$key = array_shift( $var_by_ref );
1436	if ( ! isset( $new_array[ $key ] ) )
1437	$new_array[ $key ] = $row;
1438	}
1439	return $new_array;
1440	} elseif ( $output == ARRAY_A \|\| $output == ARRAY_N ) {
1441	// Return an integer-keyed array of...
1442	if ( $this->last_result ) {
1443	foreach( (array) $this->last_result as $row ) {
1444	if ( $output == ARRAY_N ) {
1445	// ...integer-keyed row arrays
1446	$new_array[] = array_values( get_object_vars( $row ) );
1447	} else {
1448	// ...column name-keyed row arrays
1449	$new_array[] = get_object_vars( $row );
1450	}
1451	}
1452	}
1453	return $new_array;
1454	}
1455	return null;
1456	}
1457
1458	/**
1459	* Retrieve column metadata from the last query.
1460	*
1461	* @since 0.71
1462	*
1463	* @param string $info_type Optional. Type one of name, table, def, max_length, not_null, primary_key, multiple_key, unique_key, numeric, blob, type, unsigned, zerofill
1464	* @param int $col_offset Optional. 0: col name. 1: which table the col's in. 2: col's max length. 3: if the col is numeric. 4: col's type
1465	* @return mixed Column Results
1466	*/
1467	function get_col_info( $info_type = 'name', $col_offset = -1 ) {
1468	if ( $this->col_info ) {
1469	if ( $col_offset == -1 ) {
1470	$i = 0;
1471	$new_array = array();
1472	foreach( (array) $this->col_info as $col ) {
1473	$new_array[$i] = $col->{$info_type};
1474	$i++;
1475	}
1476	return $new_array;
1477	} else {
1478	return $this->col_info[$col_offset]->{$info_type};
1479	}
1480	}
1481	}
1482
1483	/**
1484	* Starts the timer, for debugging purposes.
1485	*
1486	* @since 1.5.0
1487	*
1488	* @return true
1489	*/
1490	function timer_start() {
1491	$this->time_start = microtime( true );
1492	return true;
1493	}
1494
1495	/**
1496	* Stops the debugging timer.
1497	*
1498	* @since 1.5.0
1499	*
1500	* @return float Total time spent on the query, in seconds
1501	*/
1502	function timer_stop() {
1503	return ( microtime( true ) - $this->time_start );
1504	}
1505
1506	/**
1507	* Wraps errors in a nice header and footer and dies.
1508	*
1509	* Will not die if wpdb::$show_errors is true
1510	*
1511	* @since 1.5.0
1512	*
1513	* @param string $message The Error message
1514	* @param string $error_code Optional. A Computer readable string to identify the error.
1515	* @return false\|void
1516	*/
1517	function bail( $message, $error_code = '500' ) {
1518	if ( !$this->show_errors ) {
1519	if ( class_exists( 'WP_Error' ) )
1520	$this->error = new WP_Error($error_code, $message);
1521	else
1522	$this->error = $message;
1523	return false;
1524	}
1525	wp_die($message);
1526	}
1527
1528	/**
1529	* Whether MySQL database is at least the required minimum version.
1530	*
1531	* @since 2.5.0
1532	* @uses $wp_version
1533	* @uses $required_mysql_version
1534	*
1535	* @return WP_Error
1536	*/
1537	function check_database_version() {
1538	global $wp_version, $required_mysql_version;
1539	// Make sure the server has the required MySQL version
1540	if ( version_compare($this->db_version(), $required_mysql_version, '<') )
1541	return new WP_Error('database_version', sprintf( __( '<strong>ERROR</strong>: WordPress %1$s requires MySQL %2$s or higher' ), $wp_version, $required_mysql_version ));
1542	}
1543
1544	/**
1545	* Whether the database supports collation.
1546	*
1547	* Called when WordPress is generating the table scheme.
1548	*
1549	* @since 2.5.0
1550	*
1551	* @return bool True if collation is supported, false if version does not
1552	*/
1553	function supports_collation() {
1554	return $this->has_cap( 'collation' );
1555	}
1556
1557	/**
1558	* Determine if a database supports a particular feature
1559	*
1560	* @since 2.7.0
1561	* @see wpdb::db_version()
1562	*
1563	* @param string $db_cap the feature
1564	* @return bool
1565	*/
1566	function has_cap( $db_cap ) {
1567	$version = $this->db_version();
1568
1569	switch ( strtolower( $db_cap ) ) {
1570	case 'collation' : // @since 2.5.0
1571	case 'group_concat' : // @since 2.7
1572	case 'subqueries' : // @since 2.7
1573	return version_compare( $version, '4.1', '>=' );
1574	case 'set_charset' :
1575	return version_compare($version, '5.0.7', '>=');
1576	};
1577
1578	return false;
1579	}
1580
1581	/**
1582	* Retrieve the name of the function that called wpdb.
1583	*
1584	* Searches up the list of functions until it reaches
1585	* the one that would most logically had called this method.
1586	*
1587	* @since 2.5.0
1588	*
1589	* @return string The name of the calling function
1590	*/
1591	function get_caller() {
1592	return wp_debug_backtrace_summary( __CLASS__ );
1593	}
1594
1595	/**
1596	* The database version number.
1597	*
1598	* @since 2.7.0
1599	*
1600	* @return false\|string false on failure, version number on success
1601	*/
1602	function db_version() {
1603	return preg_replace( '/[^0-9.].*/', '', mysql_get_server_info( $this->dbh ) );
1604	}
1605	}

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Ticket #21359: wp-db.php

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