512 lines
15 KiB
PHP
512 lines
15 KiB
PHP
<?php
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// WordPress DB Class
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// ORIGINAL CODE FROM:
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// Justin Vincent (justin@visunet.ie)
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// http://php.justinvincent.com
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define('EZSQL_VERSION', 'WP1.25');
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define('OBJECT', 'OBJECT', true);
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define('ARRAY_A', 'ARRAY_A', false);
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define('ARRAY_N', 'ARRAY_N', false);
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if (!defined('SAVEQUERIES'))
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define('SAVEQUERIES', false);
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class wpdb {
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var $show_errors = true;
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var $num_queries = 0;
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var $last_query;
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var $col_info;
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var $queries;
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var $prefix = '';
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// Our tables
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var $posts;
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var $users;
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var $categories;
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var $post2cat;
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var $comments;
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var $links;
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var $options;
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var $postmeta;
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var $usermeta;
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var $terms;
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var $term_taxonomy;
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var $term_relationships;
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var $tables = array('users', 'usermeta', 'posts', 'categories', 'post2cat', 'comments', 'links', 'link2cat', 'options',
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'postmeta', 'terms', 'term_taxonomy', 'term_relationships');
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var $charset;
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var $collate;
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/**
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* Connects to the database server and selects a database
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* @param string $dbuser
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* @param string $dbpassword
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* @param string $dbname
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* @param string $dbhost
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*/
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function wpdb($dbuser, $dbpassword, $dbname, $dbhost) {
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return $this->__construct($dbuser, $dbpassword, $dbname, $dbhost);
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}
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function __construct($dbuser, $dbpassword, $dbname, $dbhost) {
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register_shutdown_function(array(&$this, "__destruct"));
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if ( defined('DB_CHARSET') )
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$this->charset = DB_CHARSET;
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if ( defined('DB_COLLATE') )
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$this->collate = DB_COLLATE;
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$this->dbh = @mysql_connect($dbhost, $dbuser, $dbpassword);
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if (!$this->dbh) {
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$this->bail("
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<h1>Error establishing a database connection</h1>
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<p>This either means that the username and password information in your <code>wp-config.php</code> file is incorrect or we can't contact the database server at <code>$dbhost</code>. This could mean your host's database server is down.</p>
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<ul>
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<li>Are you sure you have the correct username and password?</li>
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<li>Are you sure that you have typed the correct hostname?</li>
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<li>Are you sure that the database server is running?</li>
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</ul>
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<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>
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");
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}
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if ( !empty($this->charset) && version_compare(mysql_get_server_info(), '4.1.0', '>=') )
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$this->query("SET NAMES '$this->charset'");
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$this->select($dbname);
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}
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function __destruct() {
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return true;
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}
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function set_prefix($prefix) {
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if ( preg_match('|[^a-z0-9_]|i', $prefix) )
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return new WP_Error('invalid_db_prefix', 'Invalid database prefix'); // No gettext here
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$old_prefix = $this->prefix;
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$this->prefix = $prefix;
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foreach ( $this->tables as $table )
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$this->$table = $this->prefix . $table;
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if ( defined('CUSTOM_USER_TABLE') )
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$this->users = CUSTOM_USER_TABLE;
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if ( defined('CUSTOM_USER_META_TABLE') )
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$this->usermeta = CUSTOM_USER_META_TABLE;
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return $old_prefix;
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}
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/**
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* Selects a database using the current class's $this->dbh
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* @param string $db name
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*/
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function select($db) {
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if (!@mysql_select_db($db, $this->dbh)) {
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$this->bail("
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<h1>Can’t select database</h1>
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<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>$db</code> database.</p>
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<ul>
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<li>Are you sure it exists?</li>
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<li>On some systems the name of your database is prefixed with your username, so it would be like username_wordpress. Could that be the problem?</li>
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</ul>
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<p>If you don't know how to setup 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>");
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}
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}
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/**
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* Escapes content for insertion into the database, for security
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*
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* @param string $string
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* @return string query safe string
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*/
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function escape($string) {
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return addslashes( $string ); // Disable rest for now, causing problems
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if( !$this->dbh || version_compare( phpversion(), '4.3.0' ) == '-1' )
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return mysql_escape_string( $string );
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else
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return mysql_real_escape_string( $string, $this->dbh );
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}
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/**
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* Escapes content by reference for insertion into the database, for security
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* @param string $s
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*/
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function escape_by_ref(&$s) {
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$s = $this->escape($s);
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}
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/**
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* Prepares a SQL query for safe use, using sprintf() syntax
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*/
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function prepare($args=NULL) {
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if ( NULL === $args )
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return;
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$args = func_get_args();
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$query = array_shift($args);
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$query = str_replace("'%s'", '%s', $query); // in case someone mistakenly already singlequoted it
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$query = str_replace('"%s"', '%s', $query); // doublequote unquoting
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$query = str_replace('%s', "'%s'", $query); // quote the strings
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array_walk($args, array(&$this, 'escape_by_ref'));
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return @vsprintf($query, $args);
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}
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// ==================================================================
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// Print SQL/DB error.
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function print_error($str = '') {
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global $EZSQL_ERROR;
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if (!$str) $str = mysql_error($this->dbh);
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$EZSQL_ERROR[] =
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array ('query' => $this->last_query, 'error_str' => $str);
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$str = htmlspecialchars($str, ENT_QUOTES);
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$query = htmlspecialchars($this->last_query, ENT_QUOTES);
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// Is error output turned on or not..
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if ( $this->show_errors ) {
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// If there is an error then take note of it
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print "<div id='error'>
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<p class='wpdberror'><strong>WordPress database error:</strong> [$str]<br />
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<code>$query</code></p>
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</div>";
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} else {
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return false;
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}
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}
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// ==================================================================
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// Turn error handling on or off..
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function show_errors() {
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$this->show_errors = true;
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}
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function hide_errors() {
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$this->show_errors = false;
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}
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// ==================================================================
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// Kill cached query results
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function flush() {
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$this->last_result = array();
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$this->col_info = null;
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$this->last_query = null;
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}
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// ==================================================================
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// Basic Query - see docs for more detail
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function query($query) {
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// filter the query, if filters are available
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// NOTE: some queries are made before the plugins have been loaded, and thus cannot be filtered with this method
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if ( function_exists('apply_filters') )
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$query = apply_filters('query', $query);
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// initialise return
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$return_val = 0;
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$this->flush();
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// Log how the function was called
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$this->func_call = "\$db->query(\"$query\")";
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// Keep track of the last query for debug..
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$this->last_query = $query;
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// Perform the query via std mysql_query function..
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if (SAVEQUERIES)
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$this->timer_start();
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$this->result = @mysql_query($query, $this->dbh);
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++$this->num_queries;
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if (SAVEQUERIES)
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$this->queries[] = array( $query, $this->timer_stop(), $this->get_caller() );
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// If there is an error then take note of it..
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if ( mysql_error($this->dbh) ) {
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$this->print_error();
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return false;
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}
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if ( preg_match("/^\\s*(insert|delete|update|replace) /i",$query) ) {
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$this->rows_affected = mysql_affected_rows($this->dbh);
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// Take note of the insert_id
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if ( preg_match("/^\\s*(insert|replace) /i",$query) ) {
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$this->insert_id = mysql_insert_id($this->dbh);
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}
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// Return number of rows affected
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$return_val = $this->rows_affected;
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} else {
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$i = 0;
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while ($i < @mysql_num_fields($this->result)) {
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$this->col_info[$i] = @mysql_fetch_field($this->result);
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$i++;
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}
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$num_rows = 0;
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while ( $row = @mysql_fetch_object($this->result) ) {
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$this->last_result[$num_rows] = $row;
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$num_rows++;
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}
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@mysql_free_result($this->result);
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// Log number of rows the query returned
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$this->num_rows = $num_rows;
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// Return number of rows selected
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$return_val = $this->num_rows;
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}
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return $return_val;
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}
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/**
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* Insert an array of data into a table
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* @param string $table WARNING: not sanitized!
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* @param array $data should not already be SQL-escaped
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* @return mixed results of $this->query()
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*/
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function insert($table, $data) {
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$data = add_magic_quotes($data);
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$fields = array_keys($data);
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return $this->query("INSERT INTO $table (`" . implode('`,`',$fields) . "`) VALUES ('".implode("','",$data)."')");
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}
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/**
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* Update a row in the table with an array of data
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* @param string $table WARNING: not sanitized!
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* @param array $data should not already be SQL-escaped
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* @param array $where a named array of WHERE column => value relationships. Multiple member pairs will be joined with ANDs. WARNING: the column names are not currently sanitized!
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* @return mixed results of $this->query()
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*/
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function update($table, $data, $where){
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$data = add_magic_quotes($data);
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$bits = $wheres = array();
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foreach ( array_keys($data) as $k )
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$bits[] = "`$k` = '$data[$k]'";
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if ( is_array( $where ) )
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foreach ( $where as $c => $v )
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$wheres[] = "$c = '" . $this->escape( $v ) . "'";
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else
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return false;
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return $this->query( "UPDATE $table SET " . implode( ', ', $bits ) . ' WHERE ' . implode( ' AND ', $wheres ) . ' LIMIT 1' );
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}
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/**
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* Get one variable from the database
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* @param string $query (can be null as well, for caching, see codex)
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* @param int $x = 0 row num to return
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* @param int $y = 0 col num to return
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* @return mixed results
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*/
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function get_var($query=null, $x = 0, $y = 0) {
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$this->func_call = "\$db->get_var(\"$query\",$x,$y)";
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if ( $query )
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$this->query($query);
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// Extract var out of cached results based x,y vals
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if ( $this->last_result[$y] ) {
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$values = array_values(get_object_vars($this->last_result[$y]));
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}
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// If there is a value return it else return null
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return (isset($values[$x]) && $values[$x]!=='') ? $values[$x] : null;
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}
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/**
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* Get one row from the database
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* @param string $query
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* @param string $output ARRAY_A | ARRAY_N | OBJECT
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* @param int $y row num to return
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* @return mixed results
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*/
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function get_row($query = null, $output = OBJECT, $y = 0) {
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$this->func_call = "\$db->get_row(\"$query\",$output,$y)";
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if ( $query )
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$this->query($query);
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else
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return null;
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if ( !isset($this->last_result[$y]) )
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return null;
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if ( $output == OBJECT ) {
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return $this->last_result[$y] ? $this->last_result[$y] : null;
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} elseif ( $output == ARRAY_A ) {
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return $this->last_result[$y] ? get_object_vars($this->last_result[$y]) : null;
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} elseif ( $output == ARRAY_N ) {
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return $this->last_result[$y] ? array_values(get_object_vars($this->last_result[$y])) : null;
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} else {
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$this->print_error(" \$db->get_row(string query, output type, int offset) -- Output type must be one of: OBJECT, ARRAY_A, ARRAY_N");
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}
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}
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/**
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* Gets one column from the database
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* @param string $query (can be null as well, for caching, see codex)
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* @param int $x col num to return
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* @return array results
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*/
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function get_col($query = null , $x = 0) {
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if ( $query )
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$this->query($query);
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$new_array = array();
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// Extract the column values
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for ( $i=0; $i < count($this->last_result); $i++ ) {
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$new_array[$i] = $this->get_var(null, $x, $i);
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}
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return $new_array;
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}
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/**
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* Return an entire result set from the database
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* @param string $query (can also be null to pull from the cache)
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* @param string $output ARRAY_A | ARRAY_N | OBJECT
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* @return mixed results
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*/
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function get_results($query = null, $output = OBJECT) {
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$this->func_call = "\$db->get_results(\"$query\", $output)";
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if ( $query )
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$this->query($query);
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else
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return null;
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// Send back array of objects. Each row is an object
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if ( $output == OBJECT ) {
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return $this->last_result;
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} elseif ( $output == ARRAY_A || $output == ARRAY_N ) {
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if ( $this->last_result ) {
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$i = 0;
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foreach( $this->last_result as $row ) {
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$new_array[$i] = (array) $row;
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if ( $output == ARRAY_N ) {
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$new_array[$i] = array_values($new_array[$i]);
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}
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$i++;
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}
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return $new_array;
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} else {
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return null;
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}
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}
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}
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/**
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* Grabs column metadata from the last query
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* @param string $info_type one of name, table, def, max_length, not_null, primary_key, multiple_key, unique_key, numeric, blob, type, unsigned, zerofill
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* @param int $col_offset 0: col name. 1: which table the col's in. 2: col's max length. 3: if the col is numeric. 4: col's type
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* @return mixed results
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*/
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function get_col_info($info_type = 'name', $col_offset = -1) {
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if ( $this->col_info ) {
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if ( $col_offset == -1 ) {
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$i = 0;
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foreach($this->col_info as $col ) {
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$new_array[$i] = $col->{$info_type};
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$i++;
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}
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return $new_array;
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} else {
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return $this->col_info[$col_offset]->{$info_type};
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}
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}
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}
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/**
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* Starts the timer, for debugging purposes
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*/
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function timer_start() {
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$mtime = microtime();
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$mtime = explode(' ', $mtime);
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$this->time_start = $mtime[1] + $mtime[0];
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return true;
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}
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/**
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* Stops the debugging timer
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* @return int total time spent on the query, in milliseconds
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*/
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function timer_stop() {
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$mtime = microtime();
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$mtime = explode(' ', $mtime);
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$time_end = $mtime[1] + $mtime[0];
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$time_total = $time_end - $this->time_start;
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return $time_total;
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}
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/**
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* Wraps fatal errors in a nice header and footer and dies.
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* @param string $message
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*/
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function bail($message) { // Just wraps errors in a nice header and footer
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if ( !$this->show_errors )
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return false;
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wp_die($message);
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}
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/**
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* Checks wether of not the database version is high enough to support the features WordPress uses
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* @global $wp_version
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*/
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function check_database_version()
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{
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global $wp_version;
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// Make sure the server has MySQL 4.0
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$mysql_version = preg_replace('|[^0-9\.]|', '', @mysql_get_server_info());
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if ( version_compare($mysql_version, '4.0.0', '<') )
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return new WP_Error('database_version',sprintf(__('<strong>ERROR</strong>: WordPress %s requires MySQL 4.0.0 or higher'), $wp_version));
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}
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/**
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* This function is called when WordPress is generating the table schema to determine wether or not the current database
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* supports or needs the collation statements.
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*/
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function supports_collation()
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{
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return ( version_compare(mysql_get_server_info(), '4.1.0', '>=') );
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}
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/**
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* Get the name of the function that called wpdb.
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* @return string the name of the calling function
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*/
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function get_caller() {
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// requires PHP 4.3+
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if ( !is_callable('debug_backtrace') )
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return '';
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$bt = debug_backtrace();
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$caller = '';
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foreach ( $bt as $trace ) {
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if ( @$trace['class'] == __CLASS__ )
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continue;
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elseif ( strtolower(@$trace['function']) == 'call_user_func_array' )
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continue;
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elseif ( strtolower(@$trace['function']) == 'apply_filters' )
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continue;
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elseif ( strtolower(@$trace['function']) == 'do_action' )
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continue;
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$caller = $trace['function'];
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break;
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}
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return $caller;
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}
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}
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if ( ! isset($wpdb) )
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$wpdb = new wpdb(DB_USER, DB_PASSWORD, DB_NAME, DB_HOST);
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?>
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