/wp-includes/wp-db.php

<?php

/**

 * WordPress DB Class

 *

 * Original code from {@link http://php.justinvincent.com Justin Vincent (justin@visunet.ie)}

 *

 * @package WordPress

 * @subpackage Database

 * @since 0.71

 */



/**

 * @since 0.71

 */

define( 'EZSQL_VERSION', 'WP1.25' );



/**

 * @since 0.71

 */

define( 'OBJECT', 'OBJECT', true );



/**

 * @since 2.5.0

 */

define( 'OBJECT_K', 'OBJECT_K' );



/**

 * @since 0.71

 */

define( 'ARRAY_A', 'ARRAY_A' );



/**

 * @since 0.71

 */

define( 'ARRAY_N', 'ARRAY_N' );



/**

 * WordPress Database Access Abstraction Object

 *

 * It is possible to replace this class with your own

 * by setting the $wpdb global variable in wp-content/db.php

 * file to your class. The wpdb class will still be included,

 * so you can extend it or simply use your own.

 *

 * @link http://codex.wordpress.org/Function_Reference/wpdb_Class

 *

 * @package WordPress

 * @subpackage Database

 * @since 0.71

 */

class wpdb {



	/**

	 * Whether to show SQL/DB errors

	 *

	 * @since 0.71

	 * @access private

	 * @var bool

	 */

	var $show_errors = false;



	/**

	 * Whether to suppress errors during the DB bootstrapping.

	 *

	 * @access private

	 * @since 2.5.0

	 * @var bool

	 */

	var $suppress_errors = false;



	/**

	 * The last error during query.

	 *

	 * @see get_last_error()

	 * @since 2.5.0

	 * @access private

	 * @var string

	 */

	var $last_error = '';



	/**

	 * Amount of queries made

	 *

	 * @since 1.2.0

	 * @access private

	 * @var int

	 */

	var $num_queries = 0;



	/**

	 * Count of rows returned by previous query

	 *

	 * @since 1.2.0

	 * @access private

	 * @var int

	 */

	var $num_rows = 0;



	/**

	 * Count of affected rows by previous query

	 *

	 * @since 0.71

	 * @access private

	 * @var int

	 */

	var $rows_affected = 0;



	/**

	 * The ID generated for an AUTO_INCREMENT column by the previous query (usually INSERT).

	 *

	 * @since 0.71

	 * @access public

	 * @var int

	 */

	var $insert_id = 0;



	/**

	 * Saved result of the last query made

	 *

	 * @since 1.2.0

	 * @access private

	 * @var array

	 */

	var $last_query;



	/**

	 * Results of the last query made

	 *

	 * @since 1.0.0

	 * @access private

	 * @var array|null

	 */

	var $last_result;



	/**

	 * Saved info on the table column

	 *

	 * @since 1.2.0

	 * @access private

	 * @var array

	 */

	var $col_info;



	/**

	 * Saved queries that were executed

	 *

	 * @since 1.5.0

	 * @access private

	 * @var array

	 */

	var $queries;



	/**

	 * WordPress table prefix

	 *

	 * You can set this to have multiple WordPress installations

	 * in a single database. The second reason is for possible

	 * security precautions.

	 *

	 * @since 0.71

	 * @access private

	 * @var string

	 */

	var $prefix = '';



	/**

	 * Whether the database queries are ready to start executing.

	 *

	 * @since 2.5.0

	 * @access private

	 * @var bool

	 */

	var $ready = false;



	/**

	 * {@internal Missing Description}}

	 *

	 * @since 3.0.0

	 * @access public

	 * @var int

	 */

	var $blogid = 0;



	/**

	 * {@internal Missing Description}}

	 *

	 * @since 3.0.0

	 * @access public

	 * @var int

	 */

	var $siteid = 0;



	/**

	 * List of WordPress per-blog tables

	 *

	 * @since 2.5.0

	 * @access private

	 * @see wpdb::tables()

	 * @var array

	 */

	var $tables = array( 'posts', 'comments', 'links', 'options', 'postmeta',

		'terms', 'term_taxonomy', 'term_relationships', 'commentmeta' );



	/**

	 * List of deprecated WordPress tables

	 *

	 * categories, post2cat, and link2cat were deprecated in 2.3.0, db version 5539

	 *

	 * @since 2.9.0

	 * @access private

	 * @see wpdb::tables()

	 * @var array

	 */

	var $old_tables = array( 'categories', 'post2cat', 'link2cat' );



	/**

	 * List of WordPress global tables

	 *

	 * @since 3.0.0

	 * @access private

	 * @see wpdb::tables()

	 * @var array

	 */

	var $global_tables = array( 'users', 'usermeta' );



	/**

	 * List of Multisite global tables

	 *

	 * @since 3.0.0

	 * @access private

	 * @see wpdb::tables()

	 * @var array

	 */

	var $ms_global_tables = array( 'blogs', 'signups', 'site', 'sitemeta',

		'sitecategories', 'registration_log', 'blog_versions' );



	/**

	 * WordPress Comments table

	 *

	 * @since 1.5.0

	 * @access public

	 * @var string

	 */

	var $comments;



	/**

	 * WordPress Comment Metadata table

	 *

	 * @since 2.9.0

	 * @access public

	 * @var string

	 */

	var $commentmeta;



	/**

	 * WordPress Links table

	 *

	 * @since 1.5.0

	 * @access public

	 * @var string

	 */

	var $links;



	/**

	 * WordPress Options table

	 *

	 * @since 1.5.0

	 * @access public

	 * @var string

	 */

	var $options;



	/**

	 * WordPress Post Metadata table

	 *

	 * @since 1.5.0

	 * @access public

	 * @var string

	 */

	var $postmeta;



	/**

	 * WordPress Posts table

	 *

	 * @since 1.5.0

	 * @access public

	 * @var string

	 */

	var $posts;



	/**

	 * WordPress Terms table

	 *

	 * @since 2.3.0

	 * @access public

	 * @var string

	 */

	var $terms;



	/**

	 * WordPress Term Relationships table

	 *

	 * @since 2.3.0

	 * @access public

	 * @var string

	 */

	var $term_relationships;



	/**

	 * WordPress Term Taxonomy table

	 *

	 * @since 2.3.0

	 * @access public

	 * @var string

	 */

	var $term_taxonomy;



	/*

	 * Global and Multisite tables

	 */



	/**

	 * WordPress User Metadata table

	 *

	 * @since 2.3.0

	 * @access public

	 * @var string

	 */

	var $usermeta;



	/**

	 * WordPress Users table

	 *

	 * @since 1.5.0

	 * @access public

	 * @var string

	 */

	var $users;



	/**

	 * Multisite Blogs table

	 *

	 * @since 3.0.0

	 * @access public

	 * @var string

	 */

	var $blogs;



	/**

	 * Multisite Blog Versions table

	 *

	 * @since 3.0.0

	 * @access public

	 * @var string

	 */

	var $blog_versions;



	/**

	 * Multisite Registration Log table

	 *

	 * @since 3.0.0

	 * @access public

	 * @var string

	 */

	var $registration_log;



	/**

	 * Multisite Signups table

	 *

	 * @since 3.0.0

	 * @access public

	 * @var string

	 */

	var $signups;



	/**

	 * Multisite Sites table

	 *

	 * @since 3.0.0

	 * @access public

	 * @var string

	 */

	var $site;



	/**

	 * Multisite Sitewide Terms table

	 *

	 * @since 3.0.0

	 * @access public

	 * @var string

	 */

	var $sitecategories;



	/**

	 * Multisite Site Metadata table

	 *

	 * @since 3.0.0

	 * @access public

	 * @var string

	 */

	var $sitemeta;



	/**

	 * Format specifiers for DB columns. Columns not listed here default to %s. Initialized during WP load.

	 *

	 * Keys are column names, values are format types: 'ID' => '%d'

	 *

	 * @since 2.8.0

	 * @see wpdb:prepare()

	 * @see wpdb:insert()

	 * @see wpdb:update()

	 * @see wp_set_wpdb_vars()

	 * @access public

	 * @var array

	 */

	var $field_types = array();



	/**

	 * Database table columns charset

	 *

	 * @since 2.2.0

	 * @access public

	 * @var string

	 */

	var $charset;



	/**

	 * Database table columns collate

	 *

	 * @since 2.2.0

	 * @access public

	 * @var string

	 */

	var $collate;



	/**

	 * Whether to use mysql_real_escape_string

	 *

	 * @since 2.8.0

	 * @access public

	 * @var bool

	 */

	var $real_escape = false;



	/**

	 * Database Username

	 *

	 * @since 2.9.0

	 * @access private

	 * @var string

	 */

	var $dbuser;



	/**

	 * A textual description of the last query/get_row/get_var call

	 *

	 * @since 3.0.0

	 * @access public

	 * @var string

	 */

	var $func_call;



	/**

	 * Connects to the database server and selects a database

	 *

	 * PHP5 style constructor for compatibility with PHP5. Does

	 * the actual setting up of the class properties and connection

	 * to the database.

	 *

	 * @link http://core.trac.wordpress.org/ticket/3354

	 * @since 2.0.8

	 *

	 * @param string $dbuser MySQL database user

	 * @param string $dbpassword MySQL database password

	 * @param string $dbname MySQL database name

	 * @param string $dbhost MySQL database host

	 */

	function __construct( $dbuser, $dbpassword, $dbname, $dbhost ) {

		register_shutdown_function( array( &$this, '__destruct' ) );



		if ( WP_DEBUG )

			$this->show_errors();



		$this->init_charset();



		$this->dbuser = $dbuser;

		$this->dbpassword = $dbpassword;

		$this->dbname = $dbname;

		$this->dbhost = $dbhost;



		$this->db_connect();

	}



	/**

	 * PHP5 style destructor and will run when database object is destroyed.

	 *

	 * @see wpdb::__construct()

	 * @since 2.0.8

	 * @return bool true

	 */

	function __destruct() {

		return true;

	}



	/**

	 * Set $this->charset and $this->collate

	 *

	 * @since 3.1.0

	 */

	function init_charset() {

		if ( function_exists('is_multisite') && is_multisite() ) {

			$this->charset = 'utf8';

			if ( defined( 'DB_COLLATE' ) && DB_COLLATE )

				$this->collate = DB_COLLATE;

			else

				$this->collate = 'utf8_general_ci';

		} elseif ( defined( 'DB_COLLATE' ) ) {

			$this->collate = DB_COLLATE;

		}



		if ( defined( 'DB_CHARSET' ) )

			$this->charset = DB_CHARSET;

	}



	/**

	 * Sets the connection's character set.

	 *

	 * @since 3.1.0

	 *

	 * @param resource $dbh     The resource given by mysql_connect

	 * @param string   $charset The character set (optional)

	 * @param string   $collate The collation (optional)

	 */

	function set_charset($dbh, $charset = null, $collate = null) {

		if ( !isset($charset) )

			$charset = $this->charset;

		if ( !isset($collate) )

			$collate = $this->collate;

		if ( $this->has_cap( 'collation', $dbh ) && !empty( $charset ) ) {

			if ( function_exists( 'mysql_set_charset' ) && $this->has_cap( 'set_charset', $dbh ) ) {

				mysql_set_charset( $charset, $dbh );

				$this->real_escape = true;

			} else {

				$query = $this->prepare( 'SET NAMES %s', $charset );

				if ( ! empty( $collate ) )

					$query .= $this->prepare( ' COLLATE %s', $collate );

				mysql_query( $query, $dbh );

			}

		}

	}



	/**

	 * Sets the table prefix for the WordPress tables.

	 *

	 * @since 2.5.0

	 *

	 * @param string $prefix Alphanumeric name for the new prefix.

	 * @return string|WP_Error Old prefix or WP_Error on error

	 */

	function set_prefix( $prefix, $set_table_names = true ) {



		if ( preg_match( '|[^a-z0-9_]|i', $prefix ) )

			return new WP_Error('invalid_db_prefix', /*WP_I18N_DB_BAD_PREFIX*/'Invalid database prefix'/*/WP_I18N_DB_BAD_PREFIX*/);



		$old_prefix = is_multisite() ? '' : $prefix;



		if ( isset( $this->base_prefix ) )

			$old_prefix = $this->base_prefix;



		$this->base_prefix = $prefix;



		if ( $set_table_names ) {

			foreach ( $this->tables( 'global' ) as $table => $prefixed_table )

				$this->$table = $prefixed_table;



			if ( is_multisite() && empty( $this->blogid ) )

				return $old_prefix;



			$this->prefix = $this->get_blog_prefix();



			foreach ( $this->tables( 'blog' ) as $table => $prefixed_table )

				$this->$table = $prefixed_table;



			foreach ( $this->tables( 'old' ) as $table => $prefixed_table )

				$this->$table = $prefixed_table;

		}

		return $old_prefix;

	}



	/**

	 * Sets blog id.

	 *

	 * @since 3.0.0

	 * @access public

	 * @param int $blog_id

	 * @param int $site_id Optional.

	 * @return string previous blog id

	 */

	function set_blog_id( $blog_id, $site_id = 0 ) {

		if ( ! empty( $site_id ) )

			$this->siteid = $site_id;



		$old_blog_id  = $this->blogid;

		$this->blogid = $blog_id;



		$this->prefix = $this->get_blog_prefix();



		foreach ( $this->tables( 'blog' ) as $table => $prefixed_table )

			$this->$table = $prefixed_table;



		foreach ( $this->tables( 'old' ) as $table => $prefixed_table )

			$this->$table = $prefixed_table;



		return $old_blog_id;

	}



	/**

	 * Gets blog prefix.

	 *

	 * @uses is_multisite()

	 * @since 3.0.0

	 * @param int $blog_id Optional.

	 * @return string Blog prefix.

	 */

	function get_blog_prefix( $blog_id = null ) {

		if ( is_multisite() ) {

			if ( null === $blog_id )

				$blog_id = $this->blogid;

			$blog_id = (int) $blog_id;

			if ( defined( 'MULTISITE' ) && ( 0 == $blog_id || 1 == $blog_id ) )

				return $this->base_prefix;

			else

				return $this->base_prefix . $blog_id . '_';

		} else {

			return $this->base_prefix;

		}

	}



	/**

	 * Returns an array of WordPress tables.

	 *

	 * Also allows for the CUSTOM_USER_TABLE and CUSTOM_USER_META_TABLE to

	 * override the WordPress users and usersmeta tables that would otherwise

	 * be determined by the prefix.

	 *

	 * The scope argument can take one of the following:

	 *

	 * 'all' - returns 'all' and 'global' tables. No old tables are returned.

	 * 'blog' - returns the blog-level tables for the queried blog.

	 * 'global' - returns the global tables for the installation, returning multisite tables only if running multisite.

	 * 'ms_global' - returns the multisite global tables, regardless if current installation is multisite.

	 * 'old' - returns tables which are deprecated.

	 *

	 * @since 3.0.0

	 * @uses wpdb::$tables

	 * @uses wpdb::$old_tables

	 * @uses wpdb::$global_tables

	 * @uses wpdb::$ms_global_tables

	 * @uses is_multisite()

	 *

	 * @param string $scope Optional. Can be all, global, ms_global, blog, or old tables. Defaults to all.

	 * @param bool $prefix Optional. Whether to include table prefixes. Default true. If blog

	 * 	prefix is requested, then the custom users and usermeta tables will be mapped.

	 * @param int $blog_id Optional. The blog_id to prefix. Defaults to wpdb::$blogid. Used only when prefix is requested.

	 * @return array Table names. When a prefix is requested, the key is the unprefixed table name.

	 */

	function tables( $scope = 'all', $prefix = true, $blog_id = 0 ) {

		switch ( $scope ) {

			case 'all' :

				$tables = array_merge( $this->global_tables, $this->tables );

				if ( is_multisite() )

					$tables = array_merge( $tables, $this->ms_global_tables );

				break;

			case 'blog' :

				$tables = $this->tables;

				break;

			case 'global' :

				$tables = $this->global_tables;

				if ( is_multisite() )

					$tables = array_merge( $tables, $this->ms_global_tables );

				break;

			case 'ms_global' :

				$tables = $this->ms_global_tables;

				break;

			case 'old' :

				$tables = $this->old_tables;

				break;

			default :

				return array();

				break;

		}



		if ( $prefix ) {

			if ( ! $blog_id )

				$blog_id = $this->blogid;

			$blog_prefix = $this->get_blog_prefix( $blog_id );

			$base_prefix = $this->base_prefix;

			$global_tables = array_merge( $this->global_tables, $this->ms_global_tables );

			foreach ( $tables as $k => $table ) {

				if ( in_array( $table, $global_tables ) )

					$tables[ $table ] = $base_prefix . $table;

				else

					$tables[ $table ] = $blog_prefix . $table;

				unset( $tables[ $k ] );

			}



			if ( isset( $tables['users'] ) && defined( 'CUSTOM_USER_TABLE' ) )

				$tables['users'] = CUSTOM_USER_TABLE;



			if ( isset( $tables['usermeta'] ) && defined( 'CUSTOM_USER_META_TABLE' ) )

				$tables['usermeta'] = CUSTOM_USER_META_TABLE;

		}



		return $tables;

	}



	/**

	 * Selects a database using the current database connection.

	 *

	 * The database name will be changed based on the current database

	 * connection. On failure, the execution will bail and display an DB error.

	 *

	 * @since 0.71

	 *

	 * @param string $db MySQL database name

	 * @param resource $dbh Optional link identifier.

	 * @return null Always null.

	 */

	function select( $db, $dbh = null) {

		if ( is_null($dbh) )

			$dbh = $this->dbh;



		if ( !@mysql_select_db( $db, $dbh ) ) {

			$this->ready = false;

			$this->bail( sprintf( /*WP_I18N_DB_SELECT_DB*/'<h1>Can&#8217;t select database</h1>

<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>

<ul>

<li>Are you sure it exists?</li>

<li>Does the user <code>%2$s</code> have permission to use the <code>%1$s</code> database?</li>

<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>

</ul>

<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>'/*/WP_I18N_DB_SELECT_DB*/, $db, $this->dbuser ), 'db_select_fail' );

			return;

		}

	}



	/**

	 * Weak escape, using addslashes()

	 *

	 * @see addslashes()

	 * @since 2.8.0

	 * @access private

	 *

	 * @param string $string

	 * @return string

	 */

	function _weak_escape( $string ) {

		return addslashes( $string );

	}



	/**

	 * Real escape, using mysql_real_escape_string() or addslashes()

	 *

	 * @see mysql_real_escape_string()

	 * @see addslashes()

	 * @since 2.8.0

	 * @access private

	 *

	 * @param  string $string to escape

	 * @return string escaped

	 */

	function _real_escape( $string ) {

		if ( $this->dbh && $this->real_escape )

			return mysql_real_escape_string( $string, $this->dbh );

		else

			return addslashes( $string );

	}



	/**

	 * Escape data. Works on arrays.

	 *

	 * @uses wpdb::_escape()

	 * @uses wpdb::_real_escape()

	 * @since  2.8.0

	 * @access private

	 *

	 * @param  string|array $data

	 * @return string|array escaped

	 */

	function _escape( $data ) {

		if ( is_array( $data ) ) {

			foreach ( (array) $data as $k => $v ) {

				if ( is_array($v) )

					$data[$k] = $this->_escape( $v );

				else

					$data[$k] = $this->_real_escape( $v );

			}

		} else {

			$data = $this->_real_escape( $data );

		}



		return $data;

	}



	/**

	 * Escapes content for insertion into the database using addslashes(), for security.

	 *

	 * Works on arrays.

	 *

	 * @since 0.71

	 * @param string|array $data to escape

	 * @return string|array escaped as query safe string

	 */

	function escape( $data ) {

		if ( is_array( $data ) ) {

			foreach ( (array) $data as $k => $v ) {

				if ( is_array( $v ) )

					$data[$k] = $this->escape( $v );

				else

					$data[$k] = $this->_weak_escape( $v );

			}

		} else {

			$data = $this->_weak_escape( $data );

		}



		return $data;

	}



	/**

	 * Escapes content by reference for insertion into the database, for security

	 *

	 * @uses wpdb::_real_escape()

	 * @since 2.3.0

	 * @param string $string to escape

	 * @return void

	 */

	function escape_by_ref( &$string ) {

		$string = $this->_real_escape( $string );

	}



	/**

	 * Prepares a SQL query for safe execution. Uses sprintf()-like syntax.

	 *

	 * The following directives can be used in the query format string:

	 *   %d (decimal number)

	 *   %s (string)

	 *   %% (literal percentage sign - no argument needed)

	 *

	 * Both %d and %s are to be left unquoted in the query string and they need an argument passed for them.

	 * Literals (%) as parts of the query must be properly written as %%.

	 *

	 * This function only supports a small subset of the sprintf syntax; it only supports %d (decimal number), %s (string).

	 * Does not support sign, padding, alignment, width or precision specifiers.

	 * Does not support argument numbering/swapping.

	 *

	 * May be called like {@link http://php.net/sprintf sprintf()} or like {@link http://php.net/vsprintf vsprintf()}.

	 *

	 * Both %d and %s should be left unquoted in the query string.

	 *

	 * <code>

	 * wpdb::prepare( "SELECT * FROM `table` WHERE `column` = %s AND `field` = %d", 'foo', 1337 )

	 * wpdb::prepare( "SELECT DATE_FORMAT(`field`, '%%c') FROM `table` WHERE `column` = %s", 'foo' );

	 * </code>

	 *

	 * @link http://php.net/sprintf Description of syntax.

	 * @since 2.3.0

	 *

	 * @param string $query Query statement with sprintf()-like placeholders

	 * @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()}.

	 * @param mixed $args,... further variables to substitute into the query's placeholders if being called like

	 * 	{@link http://php.net/sprintf sprintf()}.

	 * @return null|false|string Sanitized query string, null if there is no query, false if there is an error and string

	 * 	if there was something to prepare

	 */

	function prepare( $query = null ) { // ( $query, *$args )

		if ( is_null( $query ) )

			return;



		$args = func_get_args();

		array_shift( $args );

		// If args were passed as an array (as in vsprintf), move them up

		if ( isset( $args[0] ) && is_array($args[0]) )

			$args = $args[0];

		$query = str_replace( "'%s'", '%s', $query ); // in case someone mistakenly already singlequoted it

		$query = str_replace( '"%s"', '%s', $query ); // doublequote unquoting

		$query = preg_replace( '|(?<!%)%s|', "'%s'", $query ); // quote the strings, avoiding escaped strings like %%s

		array_walk( $args, array( &$this, 'escape_by_ref' ) );

		return @vsprintf( $query, $args );

	}



	/**

	 * Print SQL/DB error.

	 *

	 * @since 0.71

	 * @global array $EZSQL_ERROR Stores error information of query and error string

	 *

	 * @param string $str The error to display

	 * @return bool False if the showing of errors is disabled.

	 */

	function print_error( $str = '' ) {

		global $EZSQL_ERROR;



		if ( !$str )

			$str = mysql_error( $this->dbh );

		$EZSQL_ERROR[] = array( 'query' => $this->last_query, 'error_str' => $str );



		if ( $this->suppress_errors )

			return false;



		if ( $caller = $this->get_caller() )

			$error_str = sprintf( /*WP_I18N_DB_QUERY_ERROR_FULL*/'WordPress database error %1$s for query %2$s made by %3$s'/*/WP_I18N_DB_QUERY_ERROR_FULL*/, $str, $this->last_query, $caller );

		else

			$error_str = sprintf( /*WP_I18N_DB_QUERY_ERROR*/'WordPress database error %1$s for query %2$s'/*/WP_I18N_DB_QUERY_ERROR*/, $str, $this->last_query );



		if ( function_exists( 'error_log' )

			&& ( $log_file = @ini_get( 'error_log' ) )

			&& ( 'syslog' == $log_file || @is_writable( $log_file ) )

			)

			@error_log( $error_str );



		// Are we showing errors?

		if ( ! $this->show_errors )

			return false;



		// If there is an error then take note of it

		if ( is_multisite() ) {

			$msg = "WordPress database error: [$str]\n{$this->last_query}\n";

			if ( defined( 'ERRORLOGFILE' ) )

				error_log( $msg, 3, ERRORLOGFILE );

			if ( defined( 'DIEONDBERROR' ) )

				wp_die( $msg );

		} else {

			$str   = htmlspecialchars( $str, ENT_QUOTES );

			$query = htmlspecialchars( $this->last_query, ENT_QUOTES );



			print "<div id='error'>

			<p class='wpdberror'><strong>WordPress database error:</strong> [$str]<br />

			<code>$query</code></p>

			</div>";

		}

	}



	/**

	 * Enables showing of database errors.

	 *

	 * This function should be used only to enable showing of errors.

	 * wpdb::hide_errors() should be used instead for hiding of errors. However,

	 * this function can be used to enable and disable showing of database

	 * errors.

	 *

	 * @since 0.71

	 * @see wpdb::hide_errors()

	 *

	 * @param bool $show Whether to show or hide errors

	 * @return bool Old value for showing errors.

	 */

	function show_errors( $show = true ) {

		$errors = $this->show_errors;

		$this->show_errors = $show;

		return $errors;

	}



	/**

	 * Disables showing of database errors.

	 *

	 * By default database errors are not shown.

	 *

	 * @since 0.71

	 * @see wpdb::show_errors()

	 *

	 * @return bool Whether showing of errors was active

	 */

	function hide_errors() {

		$show = $this->show_errors;

		$this->show_errors = false;

		return $show;

	}



	/**

	 * Whether to suppress database errors.

	 *

	 * By default database errors are suppressed, with a simple

	 * call to this function they can be enabled.

	 *

	 * @since 2.5.0

	 * @see wpdb::hide_errors()

	 * @param bool $suppress Optional. New value. Defaults to true.

	 * @return bool Old value

	 */

	function suppress_errors( $suppress = true ) {

		$errors = $this->suppress_errors;

		$this->suppress_errors = (bool) $suppress;

		return $errors;

	}



	/**

	 * Kill cached query results.

	 *

	 * @since 0.71

	 * @return void

	 */

	function flush() {

		$this->last_result = array();

		$this->col_info    = null;

		$this->last_query  = null;

	}



	/**

	 * Connect to and select database

	 *

	 * @since 3.0.0

	 */

	function db_connect() {

		if ( WP_DEBUG ) {

			$this->dbh = mysql_connect( $this->dbhost, $this->dbuser, $this->dbpassword, true );

		} else {

			$this->dbh = @mysql_connect( $this->dbhost, $this->dbuser, $this->dbpassword, true );

		}



		if ( !$this->dbh ) {

			$this->bail( sprintf( /*WP_I18N_DB_CONN_ERROR*/"

<h1>Error establishing a database connection</h1>

<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>

<ul>

	<li>Are you sure you have the correct username and password?</li>

	<li>Are you sure that you have typed the correct hostname?</li>

	<li>Are you sure that the database server is running?</li>

</ul>

<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>

"/*/WP_I18N_DB_CONN_ERROR*/, $this->dbhost ), 'db_connect_fail' );



			return;

		}



		$this->set_charset( $this->dbh );



		$this->ready = true;



		$this->select( $this->dbname, $this->dbh );

	}



	/**

	 * Perform a MySQL database query, using current database connection.

	 *

	 * More information can be found on the codex page.

	 *

	 * @since 0.71

	 *

	 * @param string $query Database query

	 * @return int|false Number of rows affected/selected or false on error

	 */

	function query( $query ) {

		if ( ! $this->ready )

			return false;



		// some queries are made before the plugins have been loaded, and thus cannot be filtered with this method

		if ( function_exists( 'apply_filters' ) )

			$query = apply_filters( 'query', $query );



		$return_val = 0;

		$this->flush();



		// Log how the function was called

		$this->func_call = "\$db->query(\"$query\")";



		// Keep track of the last query for debug..

		$this->last_query = $query;



		if ( defined( 'SAVEQUERIES' ) && SAVEQUERIES )

			$this->timer_start();



		$this->result = @mysql_query( $query, $this->dbh );

		$this->num_queries++;



		if ( defined( 'SAVEQUERIES' ) && SAVEQUERIES )

			$this->queries[] = array( $query, $this->timer_stop(), $this->get_caller() );



		// If there is an error then take note of it..

		if ( $this->last_error = mysql_error( $this->dbh ) ) {

			$this->print_error();

			return false;

		}



		if ( preg_match( '/^\s*(create|alter|truncate|drop) /i', $query ) ) {

			$return_val = $this->result;

		} elseif ( preg_match( '/^\s*(insert|delete|update|replace) /i', $query ) ) {

			$this->rows_affected = mysql_affected_rows( $this->dbh );

			// Take note of the insert_id

			if ( preg_match( '/^\s*(insert|replace) /i', $query ) ) {

				$this->insert_id = mysql_insert_id($this->dbh);

			}

			// Return number of rows affected

			$return_val = $this->rows_affected;

		} else {

			$i = 0;

			while ( $i < @mysql_num_fields( $this->result ) ) {

				$this->col_info[$i] = @mysql_fetch_field( $this->result );

				$i++;

			}

			$num_rows = 0;

			while ( $row = @mysql_fetch_object( $this->result ) ) {

				$this->last_result[$num_rows] = $row;

				$num_rows++;

			}



			@mysql_free_result( $this->result );



			// Log number of rows the query returned

			// and return number of rows selected

			$this->num_rows = $num_rows;

			$return_val     = $num_rows;

		}



		return $return_val;

	}



	/**

	 * Insert a row into a table.

	 *

	 * <code>

	 * wpdb::insert( 'table', array( 'column' => 'foo', 'field' => 'bar' ) )

	 * wpdb::insert( 'table', array( 'column' => 'foo', 'field' => 1337 ), array( '%s', '%d' ) )

	 * </code>

	 *

	 * @since 2.5.0

	 * @see wpdb::prepare()

	 * @see wpdb::$field_types

	 * @see wp_set_wpdb_vars()

	 *

	 * @param string $table table name

	 * @param array $data Data to insert (in column => value pairs). Both $data columns and $data values should be "raw" (neither should be SQL escaped).

	 * @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 $data will be treated as strings unless otherwise specified in wpdb::$field_types.

	 * @return int|false The number of rows inserted, or false on error.

	 */

	function insert( $table, $data, $format = null ) {

		return $this->_insert_replace_helper( $table, $data, $format, 'INSERT' );

	}



	/**

	 * Replace a row into a table.

	 *

	 * <code>

	 * wpdb::replace( 'table', array( 'column' => 'foo', 'field' => 'bar' ) )

	 * wpdb::replace( 'table', array( 'column' => 'foo', 'field' => 1337 ), array( '%s', '%d' ) )

	 * </code>

	 *

	 * @since 3.0.0

	 * @see wpdb::prepare()

	 * @see wpdb::$field_types

	 * @see wp_set_wpdb_vars()

	 *

	 * @param string $table table name

	 * @param array $data Data to insert (in column => value pairs). Both $data columns and $data values should be "raw" (neither should be SQL escaped).

	 * @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 $data will be treated as strings unless otherwise specified in wpdb::$field_types.

	 * @return int|false The number of rows affected, or false on error.

	 */

	function replace( $table, $data, $format = null ) {

		return $this->_insert_replace_helper( $table, $data, $format, 'REPLACE' );

	}



	/**

	 * Helper function for insert and replace.

	 *

	 * Runs an insert or replace query based on $type argument.

	 *

	 * @access private

	 * @since 3.0.0

	 * @see wpdb::prepare()

	 * @see wpdb::$field_types

	 * @see wp_set_wpdb_vars()

	 *

	 * @param string $table table name

	 * @param array $data Data to insert (in column => value pairs).  Both $data columns and $data values should be "raw" (neither should be SQL escaped).

	 * @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 $data will be treated as strings unless otherwise specified in wpdb::$field_types.

	 * @return int|false The number of rows affected, or false on error.

	 */

	function _insert_replace_helper( $table, $data, $format = null, $type = 'INSERT' ) {

		if ( ! in_array( strtoupper( $type ), array( 'REPLACE', 'INSERT' ) ) )

			return false;

		$formats = $format = (array) $format;

		$fields = array_keys( $data );

		$formatted_fields = array();

		foreach ( $fields as $field ) {

			if ( !empty( $format ) )

				$form = ( $form = array_shift( $formats ) ) ? $form : $format[0];

			elseif ( isset( $this->field_types[$field] ) )

				$form = $this->field_types[$field];

			else

				$form = '%s';

			$formatted_fields[] = $form;

		}

		$sql = "{$type} INTO `$table` (`" . implode( '`,`', $fields ) . "`) VALUES ('" . implode( "','", $formatted_fields ) . "')";

		return $this->query( $this->prepare( $sql, $data ) );

	}



	/**

	 * Update a row in the table

	 *

	 * <code>

	 * wpdb::update( 'table', array( 'column' => 'foo', 'field' => 'bar' ), array( 'ID' => 1 ) )

	 * wpdb::update( 'table', array( 'column' => 'foo', 'field' => 1337 ), array( 'ID' => 1 ), array( '%s', '%d' ), array( '%d' ) )

	 * </code>

	 *

	 * @since 2.5.0

	 * @see wpdb::prepare()

	 * @see wpdb::$field_types

	 * @see wp_set_wpdb_vars()

	 *

	 * @param string $table table name

	 * @param array $data Data to update (in column => value pairs). Both $data columns and $data values should be "raw" (neither should be SQL escaped).

	 * @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".

	 * @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 $data will be treated as strings unless otherwise specified in wpdb::$field_types.

	 * @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.

	 * @return int|false The number of rows updated, or false on error.

	 */

	function update( $table, $data, $where, $format = null, $where_format = null ) {

		if ( ! is_array( $data ) || ! is_array( $where ) )

			return false;



		$formats = $format = (array) $format;

		$bits = $wheres = array();

		foreach ( (array) array_keys( $data ) as $field ) {

			if ( !empty( $format ) )

				$form = ( $form = array_shift( $formats ) ) ? $form : $format[0];

			elseif ( isset($this->field_types[$field]) )

				$form = $this->field_types[$field];

			else

				$form = '%s';

			$bits[] = "`$field` = {$form}";

		}



		$where_formats = $where_format = (array) $where_format;

		foreach ( (array) array_keys( $where ) as $field ) {

			if ( !empty( $where_format ) )

				$form = ( $form = array_shift( $where_formats ) ) ? $form : $where_format[0];

			elseif ( isset( $this->field_types[$field] ) )

				$form = $this->field_types[$field];

			else

				$form = '%s';

			$wheres[] = "`$field` = {$form}";

		}



		$sql = "UPDATE `$table` SET " . implode( ', ', $bits ) . ' WHERE ' . implode( ' AND ', $wheres );

		return $this->query( $this->prepare( $sql, array_merge( array_values( $data ), array_values( $where ) ) ) );

	}



	/**

	 * Retrieve one variable from the database.

	 *

	 * Executes a SQL query and returns the value from the SQL result.

	 * 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.

	 * If $query is null, this function returns the value in the specified column and row from the previous SQL result.

	 *

	 * @since 0.71

	 *

	 * @param string|null $query Optional. SQL query. Defaults to null, use the result from the previous query.

	 * @param int $x Optional. Column of value to return.  Indexed from 0.

	 * @param int $y Optional. Row of value to return.  Indexed from 0.

	 * @return string|null Database query result (as string), or null on failure

	 */

	function get_var( $query = null, $x = 0, $y = 0 ) {

		$this->func_call = "\$db->get_var(\"$query\", $x, $y)";

		if ( $query )

			$this->query( $query );



		// Extract var out of cached results based x,y vals

		if ( !empty( $this->last_result[$y] ) ) {

			$values = array_values( get_object_vars( $this->last_result[$y] ) );

		}



		// If there is a value return it else return null

		return ( isset( $values[$x] ) && $values[$x] !== '' ) ? $values[$x] : null;

	}



	/**

	 * Retrieve one row from the database.

	 *

	 * Executes a SQL query and returns the row from the SQL result.

	 *

	 * @since 0.71

	 *

	 * @param string|null $query SQL query.

	 * @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.

	 * @param int $y Optional. Row to return. Indexed from 0.

	 * @return mixed Database query result in format specifed by $output or null on failure

	 */

	function get_row( $query = null, $output = OBJECT, $y = 0 ) {

		$this->func_call = "\$db->get_row(\"$query\",$output,$y)";

		if ( $query )

			$this->query( $query );

		else

			return null;



		if ( !isset( $this->last_result[$y] ) )

			return null;



		if ( $output == OBJECT ) {

			return $this->last_result[$y] ? $this->last_result[$y] : null;

		} elseif ( $output == ARRAY_A ) {

			return $this->last_result[$y] ? get_object_vars( $this->last_result[$y] ) : null;

		} elseif ( $output == ARRAY_N ) {

			return $this->last_result[$y] ? array_values( get_object_vars( $this->last_result[$y] ) ) : null;

		} else {

			$this->print_error(/*WP_I18N_DB_GETROW_ERROR*/" \$db->get_row(string query, output type, int offset) -- Output type must be one of: OBJECT, ARRAY_A, ARRAY_N"/*/WP_I18N_DB_GETROW_ERROR*/);

		}

	}



	/**

	 * Retrieve one column from the database.

	 *

	 * Executes a SQL query and returns the column from the SQL result.

	 * If the SQL result contains more than one column, this function returns the column specified.

	 * If $query is null, this function returns the specified column from the previous SQL result.

	 *

	 * @since 0.71

	 *

	 * @param string|null $query Optional. SQL query. Defaults to previous query.

	 * @param int $x Optional. Column to return. Indexed from 0.

	 * @return array Database query result. Array indexed from 0 by SQL result row number.

	 */

	function get_col( $query = null , $x = 0 ) {

		if ( $query )

			$this->query( $query );



		$new_array = array();

		// Extract the column values

		for ( $i = 0, $j = count( $this->last_result ); $i < $j; $i++ ) {

			$new_array[$i] = $this->get_var( null, $x, $i );

		}

		return $new_array;

	}



	/**

	 * Retrieve an entire SQL result set from the database (i.e., many rows)

	 *

	 * Executes a SQL query and returns the entire SQL result.

	 *

	 * @since 0.71

	 *

	 * @param string $query SQL query.

	 * @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.

	 * 	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.

	 * @return mixed Database query results

	 */

	function get_results( $query = null, $output = OBJECT ) {

		$this->func_call = "\$db->get_results(\"$query\", $output)";



		if ( $query )

			$this->query( $query );

		else

			return null;



		$new_array = array();

		if ( $output == OBJECT ) {

			// Return an integer-keyed array of row objects

			return $this->last_result;

		} elseif ( $output == OBJECT_K ) {

			// Return an array of row objects with keys from column 1

			// (Duplicates are discarded)

			foreach ( $this->last_result as $row ) {

				$key = array_shift( get_object_vars( $row ) );

				if ( ! isset( $new_array[ $key ] ) )

					$new_array[ $key ] = $row;

			}

			return $new_array;

		} elseif ( $output == ARRAY_A || $output == ARRAY_N ) {

			// Return an integer-keyed array of...

			if ( $this->last_result ) {

				foreach( (array) $this->last_result as $row ) {

					if ( $output == ARRAY_N ) {

						// ...integer-keyed row arrays

						$new_array[] = array_values( get_object_vars( $row ) );

					} else {

						// ...column name-keyed row arrays

						$new_array[] = get_object_vars( $row );

					}

				}

			}

			return $new_array;

		}

		return null;

	}



	/**

	 * Retrieve column metadata from the last query.

	 *

	 * @since 0.71

	 *

	 * @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

	 * @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

	 * @return mixed Column Results

	 */

	function get_col_info( $info_type = 'name', $col_offset = -1 ) {

		if ( $this->col_info ) {

			if ( $col_offset == -1 ) {

				$i = 0;

				$new_array = array();

				foreach( (array) $this->col_info as $col ) {

					$new_array[$i] = $col->{$info_type};

					$i++;

				}

				return $new_array;

			} else {

				return $this->col_info[$col_offset]->{$info_type};

			}

		}

	}



	/**

	 * Starts the timer, for debugging purposes.

	 *

	 * @since 1.5.0

	 *

	 * @return true

	 */

	function timer_start() {

		$mtime            = explode( ' ', microtime() );

		$this->time_start = $mtime[1] + $mtime[0];

		return true;

	}



	/**

	 * Stops the debugging timer.

	 *

	 * @since 1.5.0

	 *

	 * @return int Total time spent on the query, in milliseconds

	 */

	function timer_stop() {

		$mtime      = explode( ' ', microtime() );

		$time_end   = $mtime[1] + $mtime[0];

		$time_total = $time_end - $this->time_start;

		return $time_total;

	}



	/**

	 * Wraps errors in a nice header and footer and dies.

	 *

	 * Will not die if wpdb::$show_errors is true

	 *

	 * @since 1.5.0

	 *

	 * @param string $message The Error message

	 * @param string $error_code Optional. A Computer readable string to identify the error.

	 * @return false|void

	 */

	function bail( $message, $error_code = '500' ) {

		if ( !$this->show_errors ) {

			if ( class_exists( 'WP_Error' ) )

				$this->error = new WP_Error($error_code, $message);

			else

				$this->error = $message;

			return false;

		}

		wp_die($message);

	}



	/**

	 * Whether MySQL database is at least the required minimum version.

	 *

	 * @since 2.5.0

	 * @uses $wp_version

	 * @uses $required_mysql_version

	 *

	 * @return WP_Error

	 */

	function check_database_version() {

		global $wp_version, $required_mysql_version;

		// Make sure the server has the required MySQL version

		if ( version_compare($this->db_version(), $required_mysql_version, '<') )

			return new WP_Error('database_version', sprintf( __( '<strong>ERROR</strong>: WordPress %1$s requires MySQL %2$s or higher' ), $wp_version, $required_mysql_version ));

	}



	/**

	 * Whether the database supports collation.

	 *

	 * Called when WordPress is generating the table scheme.

	 *

	 * @since 2.5.0

	 *

	 * @return bool True if collation is supported, false if version does not

	 */

	function supports_collation() {

		return $this->has_cap( 'collation' );

	}



	/**

	 * Determine if a database supports a particular feature

	 *

	 * @since 2.7.0

	 * @see   wpdb::db_version()

	 *

	 * @param string $db_cap the feature

	 * @return bool

	 */

	function has_cap( $db_cap ) {

		$version = $this->db_version();



		switch ( strtolower( $db_cap ) ) {

			case 'collation' :    // @since 2.5.0

			case 'group_concat' : // @since 2.7

			case 'subqueries' :   // @since 2.7

				return version_compare( $version, '4.1', '>=' );

			case 'set_charset' :

				return version_compare($version, '5.0.7', '>=');

		};



		return false;

	}



	/**

	 * Retrieve the name of the function that called wpdb.

	 *

	 * Searches up the list of functions until it reaches

	 * the one that would most logically had called this method.

	 *

	 * @since 2.5.0

	 *

	 * @return string The name of the calling function

	 */

	function get_caller() {

		$trace  = array_reverse( debug_backtrace() );

		$caller = array();



		foreach ( $trace as $call ) {

			if ( isset( $call['class'] ) && __CLASS__ == $call['class'] )

				continue; // Filter out wpdb calls.

			$caller[] = isset( $call['class'] ) ? "{$call['class']}->{$call['function']}" : $call['function'];

		}



		return join( ', ', $caller );

	}



	/**

	 * The database version number.

	 *

	 * @since 2.7.0

	 *

	 * @return false|string false on failure, version number on success

	 */

	function db_version() {

		return preg_replace( '/[^0-9.].*/', '', mysql_get_server_info( $this->dbh ) );

	}

}



?>