source: trunk/www.guidonia.net/wp/wp-includes/wp-db.php@ 44

Last change on this file since 44 was 44, checked in by luciano, 14 years ago
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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 */
15define('EZSQL_VERSION', 'WP1.25');
16
17/**
18 * @since 0.71
19 */
20define('OBJECT', 'OBJECT', true);
21
22/**
23 * @since {@internal Version Unknown}}
24 */
25define('OBJECT_K', 'OBJECT_K', false);
26
27/**
28 * @since 0.71
29 */
30define('ARRAY_A', 'ARRAY_A', false);
31
32/**
33 * @since 0.71
34 */
35define('ARRAY_N', 'ARRAY_N', false);
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 with your class. You can name it wpdb also, since
43 * this file will not be included, if the other file is
44 * available.
45 *
46 * @link http://codex.wordpress.org/Function_Reference/wpdb_Class
47 *
48 * @package WordPress
49 * @subpackage Database
50 * @since 0.71
51 * @final
52 */
53class wpdb {
54
55 /**
56 * Whether to show SQL/DB errors
57 *
58 * @since 0.71
59 * @access private
60 * @var bool
61 */
62 var $show_errors = false;
63
64 /**
65 * Whether to suppress errors during the DB bootstrapping.
66 *
67 * @access private
68 * @since {@internal Version Unknown}}
69 * @var bool
70 */
71 var $suppress_errors = false;
72
73 /**
74 * The last error during query.
75 *
76 * @since {@internal Version Unknown}}
77 * @var string
78 */
79 var $last_error = '';
80
81 /**
82 * Amount of queries made
83 *
84 * @since 1.2.0
85 * @access private
86 * @var int
87 */
88 var $num_queries = 0;
89
90 /**
91 * Saved result of the last query made
92 *
93 * @since 1.2.0
94 * @access private
95 * @var array
96 */
97 var $last_query;
98
99 /**
100 * Saved info on the table column
101 *
102 * @since 1.2.0
103 * @access private
104 * @var array
105 */
106 var $col_info;
107
108 /**
109 * Saved queries that were executed
110 *
111 * @since 1.5.0
112 * @access private
113 * @var array
114 */
115 var $queries;
116
117 /**
118 * WordPress table prefix
119 *
120 * You can set this to have multiple WordPress installations
121 * in a single database. The second reason is for possible
122 * security precautions.
123 *
124 * @since 0.71
125 * @access private
126 * @var string
127 */
128 var $prefix = '';
129
130 /**
131 * Whether the database queries are ready to start executing.
132 *
133 * @since 2.5.0
134 * @access private
135 * @var bool
136 */
137 var $ready = false;
138
139 /**
140 * WordPress Posts table
141 *
142 * @since 1.5.0
143 * @access public
144 * @var string
145 */
146 var $posts;
147
148 /**
149 * WordPress Users table
150 *
151 * @since 1.5.0
152 * @access public
153 * @var string
154 */
155 var $users;
156
157 /**
158 * WordPress Categories table
159 *
160 * @since 1.5.0
161 * @access public
162 * @var string
163 */
164 var $categories;
165
166 /**
167 * WordPress Post to Category table
168 *
169 * @since 1.5.0
170 * @access public
171 * @var string
172 */
173 var $post2cat;
174
175 /**
176 * WordPress Comments table
177 *
178 * @since 1.5.0
179 * @access public
180 * @var string
181 */
182 var $comments;
183
184 /**
185 * WordPress Links table
186 *
187 * @since 1.5.0
188 * @access public
189 * @var string
190 */
191 var $links;
192
193 /**
194 * WordPress Options table
195 *
196 * @since 1.5.0
197 * @access public
198 * @var string
199 */
200 var $options;
201
202 /**
203 * WordPress Post Metadata table
204 *
205 * @since {@internal Version Unknown}}
206 * @access public
207 * @var string
208 */
209 var $postmeta;
210
211 /**
212 * WordPress User Metadata table
213 *
214 * @since 2.3.0
215 * @access public
216 * @var string
217 */
218 var $usermeta;
219
220 /**
221 * WordPress Terms table
222 *
223 * @since 2.3.0
224 * @access public
225 * @var string
226 */
227 var $terms;
228
229 /**
230 * WordPress Term Taxonomy table
231 *
232 * @since 2.3.0
233 * @access public
234 * @var string
235 */
236 var $term_taxonomy;
237
238 /**
239 * WordPress Term Relationships table
240 *
241 * @since 2.3.0
242 * @access public
243 * @var string
244 */
245 var $term_relationships;
246
247 /**
248 * List of WordPress tables
249 *
250 * @since {@internal Version Unknown}}
251 * @access private
252 * @var array
253 */
254 var $tables = array('users', 'usermeta', 'posts', 'categories', 'post2cat', 'comments', 'links', 'link2cat', 'options',
255 'postmeta', 'terms', 'term_taxonomy', 'term_relationships');
256
257 /**
258 * Format specifiers for DB columns. Columns not listed here default to %s. Initialized in wp-settings.php.
259 *
260 * Keys are colmn names, values are format types: 'ID' => '%d'
261 *
262 * @since 2.8.0
263 * @see wpdb:prepare()
264 * @see wpdb:insert()
265 * @see wpdb:update()
266 * @access public
267 * @war array
268 */
269 var $field_types = array();
270
271 /**
272 * Database table columns charset
273 *
274 * @since 2.2.0
275 * @access public
276 * @var string
277 */
278 var $charset;
279
280 /**
281 * Database table columns collate
282 *
283 * @since 2.2.0
284 * @access public
285 * @var string
286 */
287 var $collate;
288
289 /**
290 * Whether to use mysql_real_escape_string
291 *
292 * @since 2.8.0
293 * @access public
294 * @var bool
295 */
296 var $real_escape = false;
297
298 /**
299 * Connects to the database server and selects a database
300 *
301 * PHP4 compatibility layer for calling the PHP5 constructor.
302 *
303 * @uses wpdb::__construct() Passes parameters and returns result
304 * @since 0.71
305 *
306 * @param string $dbuser MySQL database user
307 * @param string $dbpassword MySQL database password
308 * @param string $dbname MySQL database name
309 * @param string $dbhost MySQL database host
310 */
311 function wpdb($dbuser, $dbpassword, $dbname, $dbhost) {
312 return $this->__construct($dbuser, $dbpassword, $dbname, $dbhost);
313 }
314
315 /**
316 * Connects to the database server and selects a database
317 *
318 * PHP5 style constructor for compatibility with PHP5. Does
319 * the actual setting up of the class properties and connection
320 * to the database.
321 *
322 * @since 2.0.8
323 *
324 * @param string $dbuser MySQL database user
325 * @param string $dbpassword MySQL database password
326 * @param string $dbname MySQL database name
327 * @param string $dbhost MySQL database host
328 */
329 function __construct($dbuser, $dbpassword, $dbname, $dbhost) {
330 register_shutdown_function(array(&$this, "__destruct"));
331
332 if ( defined('WP_DEBUG') and WP_DEBUG == true )
333 $this->show_errors();
334
335 if ( defined('DB_CHARSET') )
336 $this->charset = DB_CHARSET;
337
338 if ( defined('DB_COLLATE') )
339 $this->collate = DB_COLLATE;
340
341 $this->dbh = @mysql_connect($dbhost, $dbuser, $dbpassword, true);
342 if (!$this->dbh) {
343 $this->bail(sprintf(/*WP_I18N_DB_CONN_ERROR*/'
344<h1>Errore nello stabilire una connessione al database</h1>
345<p>Ciò significa che le informazioni sul nome utente o sulla password presenti nel file <code>wp-config.php</code> non sono corrette o che non Ú possibile contattare il server del database a <code>%s</code>. Il che potrebbe voler dire che il database server del fornitore di hosting non Ú attivo.</p>
346<ul>
347 <li>Si Ú sicuri di disporre del nome utente e della password corretti?</li>
348 <li>Si Ú sicuri di aver digitato correttamente il nome dell\'host?</li>
349 <li>Si Ú sicuri che il server del database sia funzionante?</li>
350</ul>
351<p>Nel caso non si abbia certezza sul significato di questi termini Ú opportuno contattare il proprio host. Se si ha bisogno di ulteriore aiuto Ú sempre possibile visitare il <a href=\'http://www.wordpress-it.it/forumt/\'>Forum di supporto italiano su WordPress</a>.</p>
352'/*/WP_I18N_DB_CONN_ERROR*/, $dbhost));
353 return;
354 }
355
356 $this->ready = true;
357
358 if ( $this->has_cap( 'collation' ) ) {
359 if ( !empty($this->charset) ) {
360 if ( function_exists('mysql_set_charset') ) {
361 mysql_set_charset($this->charset, $this->dbh);
362 $this->real_escape = true;
363 } else {
364 $collation_query = "SET NAMES '{$this->charset}'";
365 if ( !empty($this->collate) )
366 $collation_query .= " COLLATE '{$this->collate}'";
367 $this->query($collation_query);
368 }
369 }
370 }
371
372 $this->select($dbname);
373 }
374
375 /**
376 * PHP5 style destructor and will run when database object is destroyed.
377 *
378 * @since 2.0.8
379 *
380 * @return bool Always true
381 */
382 function __destruct() {
383 return true;
384 }
385
386 /**
387 * Sets the table prefix for the WordPress tables.
388 *
389 * Also allows for the CUSTOM_USER_TABLE and CUSTOM_USER_META_TABLE to
390 * override the WordPress users and usersmeta tables that would otherwise be determined by the $prefix.
391 *
392 * @since 2.5.0
393 *
394 * @param string $prefix Alphanumeric name for the new prefix.
395 * @return string|WP_Error Old prefix or WP_Error on error
396 */
397 function set_prefix($prefix) {
398
399 if ( preg_match('|[^a-z0-9_]|i', $prefix) )
400 return new WP_Error('invalid_db_prefix', /*WP_I18N_DB_BAD_PREFIX*/'Prefisso database non valido'/*/WP_I18N_DB_BAD_PREFIX*/);
401
402 $old_prefix = $this->prefix;
403 $this->prefix = $prefix;
404
405 foreach ( (array) $this->tables as $table )
406 $this->$table = $this->prefix . $table;
407
408 if ( defined('CUSTOM_USER_TABLE') )
409 $this->users = CUSTOM_USER_TABLE;
410
411 if ( defined('CUSTOM_USER_META_TABLE') )
412 $this->usermeta = CUSTOM_USER_META_TABLE;
413
414 return $old_prefix;
415 }
416
417 /**
418 * Selects a database using the current database connection.
419 *
420 * The database name will be changed based on the current database
421 * connection. On failure, the execution will bail and display an DB error.
422 *
423 * @since 0.71
424 *
425 * @param string $db MySQL database name
426 * @return null Always null.
427 */
428 function select($db) {
429 if (!@mysql_select_db($db, $this->dbh)) {
430 $this->ready = false;
431 $this->bail(sprintf(/*WP_I18N_DB_SELECT_DB*/'
432<h1>Impossibile selesionare il database</h1>
433<p>&Egrave; stato possibile connettersi al server del database (il che significa che il nome utente e la password sono ok) ma non Ú stato possibile selezionare il database <code>%1$s</code>.</p>
434<ul>
435<li>Si Ú certi che esista?</li>
436<li>L\'utente <code>%2$s</code> ha i permessi di usare il database <code>%1$s</code>?</li>
437<li>Su alcuni sistemi il nome del database va fatto precedere dal nome utente, così da avere un formato simile a username_wordpress. Potrebbe essere questo il problema?</li>
438</ul>
439<p>Se non si sa come impostare un database sarebbe opportuno <strong>contattare il proprio host</strong>. Se tutto questo fallisce Ú possibile trovare aiuto sul <a href=\'http://www.wordpress-it.it/forumt/\'>Forum di supporto italiano su WordPress</a>.</p>'/*/WP_I18N_DB_SELECT_DB*/, $db, DB_USER));
440 return;
441 }
442 }
443
444 function _weak_escape($string) {
445 return addslashes($string);
446 }
447
448 function _real_escape($string) {
449 if ( $this->dbh && $this->real_escape )
450 return mysql_real_escape_string( $string, $this->dbh );
451 else
452 return addslashes( $string );
453 }
454
455 function _escape($data) {
456 if ( is_array($data) ) {
457 foreach ( (array) $data as $k => $v ) {
458 if ( is_array($v) )
459 $data[$k] = $this->_escape( $v );
460 else
461 $data[$k] = $this->_real_escape( $v );
462 }
463 } else {
464 $data = $this->_real_escape( $data );
465 }
466
467 return $data;
468 }
469
470 /**
471 * Escapes content for insertion into the database using addslashes(), for security
472 *
473 * @since 0.71
474 *
475 * @param string|array $data
476 * @return string query safe string
477 */
478 function escape($data) {
479 if ( is_array($data) ) {
480 foreach ( (array) $data as $k => $v ) {
481 if ( is_array($v) )
482 $data[$k] = $this->escape( $v );
483 else
484 $data[$k] = $this->_weak_escape( $v );
485 }
486 } else {
487 $data = $this->_weak_escape( $data );
488 }
489
490 return $data;
491 }
492
493 /**
494 * Escapes content by reference for insertion into the database, for security
495 *
496 * @since 2.3.0
497 *
498 * @param string $s
499 */
500 function escape_by_ref(&$string) {
501 $string = $this->_real_escape( $string );
502 }
503
504 /**
505 * Prepares a SQL query for safe execution. Uses sprintf()-like syntax.
506 *
507 * This function only supports a small subset of the sprintf syntax; it only supports %d (decimal number), %s (string).
508 * Does not support sign, padding, alignment, width or precision specifiers.
509 * Does not support argument numbering/swapping.
510 *
511 * May be called like {@link http://php.net/sprintf sprintf()} or like {@link http://php.net/vsprintf vsprintf()}.
512 *
513 * Both %d and %s should be left unquoted in the query string.
514 *
515 * <code>
516 * wpdb::prepare( "SELECT * FROM `table` WHERE `column` = %s AND `field` = %d", "foo", 1337 )
517 * </code>
518 *
519 * @link http://php.net/sprintf Description of syntax.
520 * @since 2.3.0
521 *
522 * @param string $query Query statement with sprintf()-like placeholders
523 * @param array|mixed $args The array of variables to substitute into the query's placeholders if being called like {@link http://php.net/vsprintf vsprintf()}, or the first variable to substitute into the query's placeholders if being called like {@link http://php.net/sprintf sprintf()}.
524 * @param mixed $args,... further variables to substitute into the query's placeholders if being called like {@link http://php.net/sprintf sprintf()}.
525 * @return null|string Sanitized query string
526 */
527 function prepare($query = null) { // ( $query, *$args )
528 if ( is_null( $query ) )
529 return;
530 $args = func_get_args();
531 array_shift($args);
532 // If args were passed as an array (as in vsprintf), move them up
533 if ( isset($args[0]) && is_array($args[0]) )
534 $args = $args[0];
535 $query = str_replace("'%s'", '%s', $query); // in case someone mistakenly already singlequoted it
536 $query = str_replace('"%s"', '%s', $query); // doublequote unquoting
537 $query = str_replace('%s', "'%s'", $query); // quote the strings
538 array_walk($args, array(&$this, 'escape_by_ref'));
539 return @vsprintf($query, $args);
540 }
541
542 /**
543 * Print SQL/DB error.
544 *
545 * @since 0.71
546 * @global array $EZSQL_ERROR Stores error information of query and error string
547 *
548 * @param string $str The error to display
549 * @return bool False if the showing of errors is disabled.
550 */
551 function print_error($str = '') {
552 global $EZSQL_ERROR;
553
554 if (!$str) $str = mysql_error($this->dbh);
555 $EZSQL_ERROR[] = array ('query' => $this->last_query, 'error_str' => $str);
556
557 if ( $this->suppress_errors )
558 return false;
559
560 if ( $caller = $this->get_caller() )
561 $error_str = sprintf(/*WP_I18N_DB_QUERY_ERROR_FULL*/'WordPress errore sul database %1$s per la query %2$s fatta da %3$s'/*/WP_I18N_DB_QUERY_ERROR_FULL*/, $str, $this->last_query, $caller);
562 else
563 $error_str = sprintf(/*WP_I18N_DB_QUERY_ERROR*/'WordPress errore database %1$s per la query %2$s'/*/WP_I18N_DB_QUERY_ERROR*/, $str, $this->last_query);
564
565 $log_error = true;
566 if ( ! function_exists('error_log') )
567 $log_error = false;
568
569 $log_file = @ini_get('error_log');
570 if ( !empty($log_file) && ('syslog' != $log_file) && !@is_writable($log_file) )
571 $log_error = false;
572
573 if ( $log_error )
574 @error_log($error_str, 0);
575
576 // Is error output turned on or not..
577 if ( !$this->show_errors )
578 return false;
579
580 $str = htmlspecialchars($str, ENT_QUOTES);
581 $query = htmlspecialchars($this->last_query, ENT_QUOTES);
582
583 // If there is an error then take note of it
584 print "<div id='error'>
585 <p class='wpdberror'><strong>WordPress database error:</strong> [$str]<br />
586 <code>$query</code></p>
587 </div>";
588 }
589
590 /**
591 * Enables showing of database errors.
592 *
593 * This function should be used only to enable showing of errors.
594 * wpdb::hide_errors() should be used instead for hiding of errors. However,
595 * this function can be used to enable and disable showing of database
596 * errors.
597 *
598 * @since 0.71
599 *
600 * @param bool $show Whether to show or hide errors
601 * @return bool Old value for showing errors.
602 */
603 function show_errors( $show = true ) {
604 $errors = $this->show_errors;
605 $this->show_errors = $show;
606 return $errors;
607 }
608
609 /**
610 * Disables showing of database errors.
611 *
612 * @since 0.71
613 *
614 * @return bool Whether showing of errors was active or not
615 */
616 function hide_errors() {
617 $show = $this->show_errors;
618 $this->show_errors = false;
619 return $show;
620 }
621
622 /**
623 * Whether to suppress database errors.
624 *
625 * @param unknown_type $suppress
626 * @return unknown
627 */
628 function suppress_errors( $suppress = true ) {
629 $errors = $this->suppress_errors;
630 $this->suppress_errors = $suppress;
631 return $errors;
632 }
633
634 /**
635 * Kill cached query results.
636 *
637 * @since 0.71
638 */
639 function flush() {
640 $this->last_result = array();
641 $this->col_info = null;
642 $this->last_query = null;
643 }
644
645 /**
646 * Perform a MySQL database query, using current database connection.
647 *
648 * More information can be found on the codex page.
649 *
650 * @since 0.71
651 *
652 * @param string $query
653 * @return int|false Number of rows affected/selected or false on error
654 */
655 function query($query) {
656 if ( ! $this->ready )
657 return false;
658
659 // filter the query, if filters are available
660 // NOTE: some queries are made before the plugins have been loaded, and thus cannot be filtered with this method
661 if ( function_exists('apply_filters') )
662 $query = apply_filters('query', $query);
663
664 // initialise return
665 $return_val = 0;
666 $this->flush();
667
668 // Log how the function was called
669 $this->func_call = "\$db->query(\"$query\")";
670
671 // Keep track of the last query for debug..
672 $this->last_query = $query;
673
674 // Perform the query via std mysql_query function..
675 if ( defined('SAVEQUERIES') && SAVEQUERIES )
676 $this->timer_start();
677
678 $this->result = @mysql_query($query, $this->dbh);
679 ++$this->num_queries;
680
681 if ( defined('SAVEQUERIES') && SAVEQUERIES )
682 $this->queries[] = array( $query, $this->timer_stop(), $this->get_caller() );
683
684 // If there is an error then take note of it..
685 if ( $this->last_error = mysql_error($this->dbh) ) {
686 $this->print_error();
687 return false;
688 }
689
690 if ( preg_match("/^\\s*(insert|delete|update|replace|alter) /i",$query) ) {
691 $this->rows_affected = mysql_affected_rows($this->dbh);
692 // Take note of the insert_id
693 if ( preg_match("/^\\s*(insert|replace) /i",$query) ) {
694 $this->insert_id = mysql_insert_id($this->dbh);
695 }
696 // Return number of rows affected
697 $return_val = $this->rows_affected;
698 } else {
699 $i = 0;
700 while ($i < @mysql_num_fields($this->result)) {
701 $this->col_info[$i] = @mysql_fetch_field($this->result);
702 $i++;
703 }
704 $num_rows = 0;
705 while ( $row = @mysql_fetch_object($this->result) ) {
706 $this->last_result[$num_rows] = $row;
707 $num_rows++;
708 }
709
710 @mysql_free_result($this->result);
711
712 // Log number of rows the query returned
713 $this->num_rows = $num_rows;
714
715 // Return number of rows selected
716 $return_val = $this->num_rows;
717 }
718
719 return $return_val;
720 }
721
722 /**
723 * Insert a row into a table.
724 *
725 * <code>
726 * wpdb::insert( 'table', array( 'column' => 'foo', 'field' => 1337 ), array( '%s', '%d' ) )
727 * </code>
728 *
729 * @since 2.5.0
730 * @see wpdb::prepare()
731 *
732 * @param string $table table name
733 * @param array $data Data to insert (in column => value pairs). Both $data columns and $data values should be "raw" (neither should be SQL escaped).
734 * @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. A format is one of '%d', '%s' (decimal number, string). If omitted, all values in $data will be treated as strings.
735 * @return int|false The number of rows inserted, or false on error.
736 */
737 function insert($table, $data, $format = null) {
738 $formats = $format = (array) $format;
739 $fields = array_keys($data);
740 $formatted_fields = array();
741 foreach ( $fields as $field ) {
742 if ( !empty($format) )
743 $form = ( $form = array_shift($formats) ) ? $form : $format[0];
744 elseif ( isset($this->field_types[$field]) )
745 $form = $this->field_types[$field];
746 else
747 $form = '%s';
748 $formatted_fields[] = $form;
749 }
750 $sql = "INSERT INTO `$table` (`" . implode( '`,`', $fields ) . "`) VALUES ('" . implode( "','", $formatted_fields ) . "')";
751 return $this->query( $this->prepare( $sql, $data) );
752 }
753
754
755 /**
756 * Update a row in the table
757 *
758 * <code>
759 * wpdb::update( 'table', array( 'column' => 'foo', 'field' => 1337 ), array( 'ID' => 1 ), array( '%s', '%d' ), array( '%d' ) )
760 * </code>
761 *
762 * @since 2.5.0
763 * @see wpdb::prepare()
764 *
765 * @param string $table table name
766 * @param array $data Data to update (in column => value pairs). Both $data columns and $data values should be "raw" (neither should be SQL escaped).
767 * @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".
768 * @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. A format is one of '%d', '%s' (decimal number, string). If omitted, all values in $data will be treated as strings.
769 * @param array|string $format_where (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', '%s' (decimal number, string). If omitted, all values in $where will be treated as strings.
770 * @return int|false The number of rows updated, or false on error.
771 */
772 function update($table, $data, $where, $format = null, $where_format = null) {
773 if ( !is_array( $where ) )
774 return false;
775
776 $formats = $format = (array) $format;
777 $bits = $wheres = array();
778 foreach ( (array) array_keys($data) as $field ) {
779 if ( !empty($format) )
780 $form = ( $form = array_shift($formats) ) ? $form : $format[0];
781 elseif ( isset($this->field_types[$field]) )
782 $form = $this->field_types[$field];
783 else
784 $form = '%s';
785 $bits[] = "`$field` = {$form}";
786 }
787
788 $where_formats = $where_format = (array) $where_format;
789 foreach ( (array) array_keys($where) as $field ) {
790 if ( !empty($where_format) )
791 $form = ( $form = array_shift($where_formats) ) ? $form : $where_format[0];
792 elseif ( isset($this->field_types[$field]) )
793 $form = $this->field_types[$field];
794 else
795 $form = '%s';
796 $wheres[] = "`$field` = {$form}";
797 }
798
799 $sql = "UPDATE `$table` SET " . implode( ', ', $bits ) . ' WHERE ' . implode( ' AND ', $wheres );
800 return $this->query( $this->prepare( $sql, array_merge(array_values($data), array_values($where))) );
801 }
802
803 /**
804 * Retrieve one variable from the database.
805 *
806 * Executes a SQL query and returns the value from the SQL result.
807 * 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.
808 * If $query is null, this function returns the value in the specified column and row from the previous SQL result.
809 *
810 * @since 0.71
811 *
812 * @param string|null $query SQL query. If null, use the result from the previous query.
813 * @param int $x (optional) Column of value to return. Indexed from 0.
814 * @param int $y (optional) Row of value to return. Indexed from 0.
815 * @return string Database query result
816 */
817 function get_var($query=null, $x = 0, $y = 0) {
818 $this->func_call = "\$db->get_var(\"$query\",$x,$y)";
819 if ( $query )
820 $this->query($query);
821
822 // Extract var out of cached results based x,y vals
823 if ( !empty( $this->last_result[$y] ) ) {
824 $values = array_values(get_object_vars($this->last_result[$y]));
825 }
826
827 // If there is a value return it else return null
828 return (isset($values[$x]) && $values[$x]!=='') ? $values[$x] : null;
829 }
830
831 /**
832 * Retrieve one row from the database.
833 *
834 * Executes a SQL query and returns the row from the SQL result.
835 *
836 * @since 0.71
837 *
838 * @param string|null $query SQL query.
839 * @param string $output (optional) one of ARRAY_A | ARRAY_N | OBJECT constants. Return an associative array (column => value, ...), a numerically indexed array (0 => value, ...) or an object ( ->column = value ), respectively.
840 * @param int $y (optional) Row to return. Indexed from 0.
841 * @return mixed Database query result in format specifed by $output
842 */
843 function get_row($query = null, $output = OBJECT, $y = 0) {
844 $this->func_call = "\$db->get_row(\"$query\",$output,$y)";
845 if ( $query )
846 $this->query($query);
847 else
848 return null;
849
850 if ( !isset($this->last_result[$y]) )
851 return null;
852
853 if ( $output == OBJECT ) {
854 return $this->last_result[$y] ? $this->last_result[$y] : null;
855 } elseif ( $output == ARRAY_A ) {
856 return $this->last_result[$y] ? get_object_vars($this->last_result[$y]) : null;
857 } elseif ( $output == ARRAY_N ) {
858 return $this->last_result[$y] ? array_values(get_object_vars($this->last_result[$y])) : null;
859 } else {
860 $this->print_error(/*WP_I18N_DB_GETROW_ERROR*/' $db->get_row(string query, output type, int offset) -- Il risultato deve essere uno fra questi: OBJECT, ARRAY_A, ARRAY_N'/*/WP_I18N_DB_GETROW_ERROR*/);
861 }
862 }
863
864 /**
865 * Retrieve one column from the database.
866 *
867 * Executes a SQL query and returns the column from the SQL result.
868 * If the SQL result contains more than one column, this function returns the column specified.
869 * If $query is null, this function returns the specified column from the previous SQL result.
870 *
871 * @since 0.71
872 *
873 * @param string|null $query SQL query. If null, use the result from the previous query.
874 * @param int $x Column to return. Indexed from 0.
875 * @return array Database query result. Array indexed from 0 by SQL result row number.
876 */
877 function get_col($query = null , $x = 0) {
878 if ( $query )
879 $this->query($query);
880
881 $new_array = array();
882 // Extract the column values
883 for ( $i=0; $i < count($this->last_result); $i++ ) {
884 $new_array[$i] = $this->get_var(null, $x, $i);
885 }
886 return $new_array;
887 }
888
889 /**
890 * Retrieve an entire SQL result set from the database (i.e., many rows)
891 *
892 * Executes a SQL query and returns the entire SQL result.
893 *
894 * @since 0.71
895 *
896 * @param string $query SQL query.
897 * @param string $output (optional) ane of ARRAY_A | ARRAY_N | OBJECT | OBJECT_K constants. With one of the first three, return an array of rows indexed from 0 by SQL result row number. Each row is an associative array (column => value, ...), a numerically indexed array (0 => value, ...), or an object. ( ->column = value ), respectively. With OBJECT_K, return an associative array of row objects keyed by the value of each row's first column's value. Duplicate keys are discarded.
898 * @return mixed Database query results
899 */
900 function get_results($query = null, $output = OBJECT) {
901 $this->func_call = "\$db->get_results(\"$query\", $output)";
902
903 if ( $query )
904 $this->query($query);
905 else
906 return null;
907
908 if ( $output == OBJECT ) {
909 // Return an integer-keyed array of row objects
910 return $this->last_result;
911 } elseif ( $output == OBJECT_K ) {
912 // Return an array of row objects with keys from column 1
913 // (Duplicates are discarded)
914 foreach ( $this->last_result as $row ) {
915 $key = array_shift( get_object_vars( $row ) );
916 if ( !isset( $new_array[ $key ] ) )
917 $new_array[ $key ] = $row;
918 }
919 return $new_array;
920 } elseif ( $output == ARRAY_A || $output == ARRAY_N ) {
921 // Return an integer-keyed array of...
922 if ( $this->last_result ) {
923 $i = 0;
924 foreach( (array) $this->last_result as $row ) {
925 if ( $output == ARRAY_N ) {
926 // ...integer-keyed row arrays
927 $new_array[$i] = array_values( get_object_vars( $row ) );
928 } else {
929 // ...column name-keyed row arrays
930 $new_array[$i] = get_object_vars( $row );
931 }
932 ++$i;
933 }
934 return $new_array;
935 }
936 }
937 }
938
939 /**
940 * Retrieve column metadata from the last query.
941 *
942 * @since 0.71
943 *
944 * @param string $info_type one of name, table, def, max_length, not_null, primary_key, multiple_key, unique_key, numeric, blob, type, unsigned, zerofill
945 * @param int $col_offset 0: col name. 1: which table the col's in. 2: col's max length. 3: if the col is numeric. 4: col's type
946 * @return mixed Column Results
947 */
948 function get_col_info($info_type = 'name', $col_offset = -1) {
949 if ( $this->col_info ) {
950 if ( $col_offset == -1 ) {
951 $i = 0;
952 foreach( (array) $this->col_info as $col ) {
953 $new_array[$i] = $col->{$info_type};
954 $i++;
955 }
956 return $new_array;
957 } else {
958 return $this->col_info[$col_offset]->{$info_type};
959 }
960 }
961 }
962
963 /**
964 * Starts the timer, for debugging purposes.
965 *
966 * @since 1.5.0
967 *
968 * @return true
969 */
970 function timer_start() {
971 $mtime = microtime();
972 $mtime = explode(' ', $mtime);
973 $this->time_start = $mtime[1] + $mtime[0];
974 return true;
975 }
976
977 /**
978 * Stops the debugging timer.
979 *
980 * @since 1.5.0
981 *
982 * @return int Total time spent on the query, in milliseconds
983 */
984 function timer_stop() {
985 $mtime = microtime();
986 $mtime = explode(' ', $mtime);
987 $time_end = $mtime[1] + $mtime[0];
988 $time_total = $time_end - $this->time_start;
989 return $time_total;
990 }
991
992 /**
993 * Wraps errors in a nice header and footer and dies.
994 *
995 * Will not die if wpdb::$show_errors is true
996 *
997 * @since 1.5.0
998 *
999 * @param string $message
1000 * @return false|void
1001 */
1002 function bail($message) {
1003 if ( !$this->show_errors ) {
1004 if ( class_exists('WP_Error') )
1005 $this->error = new WP_Error('500', $message);
1006 else
1007 $this->error = $message;
1008 return false;
1009 }
1010 wp_die($message);
1011 }
1012
1013 /**
1014 * Whether or not MySQL database is at least the required minimum version.
1015 *
1016 * @since 2.5.0
1017 * @uses $wp_version
1018 *
1019 * @return WP_Error
1020 */
1021 function check_database_version()
1022 {
1023 global $wp_version;
1024 // Make sure the server has MySQL 4.0
1025 if ( version_compare($this->db_version(), '4.0.0', '<') )
1026 return new WP_Error('database_version',sprintf(__('<strong>ERROR</strong>: WordPress %s requires MySQL 4.0.0 or higher'), $wp_version));
1027 }
1028
1029 /**
1030 * Whether of not the database supports collation.
1031 *
1032 * Called when WordPress is generating the table scheme.
1033 *
1034 * @since 2.5.0
1035 *
1036 * @return bool True if collation is supported, false if version does not
1037 */
1038 function supports_collation()
1039 {
1040 return $this->has_cap( 'collation' );
1041 }
1042
1043 /**
1044 * Generic function to determine if a database supports a particular feature
1045 * @param string $db_cap the feature
1046 * @param false|string|resource $dbh_or_table (not implemented) Which database to test. False = the currently selected database, string = the database containing the specified table, resource = the database corresponding to the specified mysql resource.
1047 * @return bool
1048 */
1049 function has_cap( $db_cap ) {
1050 $version = $this->db_version();
1051
1052 switch ( strtolower( $db_cap ) ) :
1053 case 'collation' : // @since 2.5.0
1054 case 'group_concat' : // @since 2.7
1055 case 'subqueries' : // @since 2.7
1056 return version_compare($version, '4.1', '>=');
1057 break;
1058 endswitch;
1059
1060 return false;
1061 }
1062
1063 /**
1064 * Retrieve the name of the function that called wpdb.
1065 *
1066 * Requires PHP 4.3 and searches up the list of functions until it reaches
1067 * the one that would most logically had called this method.
1068 *
1069 * @since 2.5.0
1070 *
1071 * @return string The name of the calling function
1072 */
1073 function get_caller() {
1074 // requires PHP 4.3+
1075 if ( !is_callable('debug_backtrace') )
1076 return '';
1077
1078 $bt = debug_backtrace();
1079 $caller = array();
1080
1081 $bt = array_reverse( $bt );
1082 foreach ( (array) $bt as $call ) {
1083 if ( @$call['class'] == __CLASS__ )
1084 continue;
1085 $function = $call['function'];
1086 if ( isset( $call['class'] ) )
1087 $function = $call['class'] . "->$function";
1088 $caller[] = $function;
1089 }
1090 $caller = join( ', ', $caller );
1091
1092 return $caller;
1093 }
1094
1095 /**
1096 * The database version number
1097 * @param false|string|resource $dbh_or_table (not implemented) Which database to test. False = the currently selected database, string = the database containing the specified table, resource = the database corresponding to the specified mysql resource.
1098 * @return false|string false on failure, version number on success
1099 */
1100 function db_version() {
1101 return preg_replace('/[^0-9.].*/', '', mysql_get_server_info( $this->dbh ));
1102 }
1103}
1104
1105if ( ! isset($wpdb) ) {
1106 /**
1107 * WordPress Database Object, if it isn't set already in wp-content/db.php
1108 * @global object $wpdb Creates a new wpdb object based on wp-config.php Constants for the database
1109 * @since 0.71
1110 */
1111 $wpdb = new wpdb(DB_USER, DB_PASSWORD, DB_NAME, DB_HOST);
1112}
1113?>
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