--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/wp-db.php Wed Nov 06 03:21:17 2013 +0000
@@ -0,0 +1,1752 @@
+<?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.
+ *
+ * @since 2.5.0
+ * @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 0.71
+ * @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;
+
+ /**
+ * Last query made
+ *
+ * @since 0.71
+ * @access private
+ * @var array
+ */
+ var $last_query;
+
+ /**
+ * Results of the last query made
+ *
+ * @since 0.71
+ * @access private
+ * @var array|null
+ */
+ var $last_result;
+
+ /**
+ * MySQL result, which is either a resource or boolean.
+ *
+ * @since 0.71
+ * @access protected
+ * @var mixed
+ */
+ protected $result;
+
+ /**
+ * Saved info on the table column
+ *
+ * @since 0.71
+ * @access protected
+ * @var array
+ */
+ protected $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 2.5.0
+ * @access private
+ * @var string
+ */
+ var $prefix = '';
+
+ /**
+ * Whether the database queries are ready to start executing.
+ *
+ * @since 2.3.2
+ * @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 wpdb::delete()
+ * @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;
+
+ /**
+ * Database Username
+ *
+ * @since 2.9.0
+ * @access protected
+ * @var string
+ */
+ protected $dbuser;
+
+ /**
+ * Database Password
+ *
+ * @since 3.1.0
+ * @access protected
+ * @var string
+ */
+ protected $dbpassword;
+
+ /**
+ * Database Name
+ *
+ * @since 3.1.0
+ * @access protected
+ * @var string
+ */
+ protected $dbname;
+
+ /**
+ * Database Host
+ *
+ * @since 3.1.0
+ * @access protected
+ * @var string
+ */
+ protected $dbhost;
+
+ /**
+ * Database Handle
+ *
+ * @since 0.71
+ * @access protected
+ * @var string
+ */
+ protected $dbh;
+
+ /**
+ * A textual description of the last query/get_row/get_var call
+ *
+ * @since 3.0.0
+ * @access public
+ * @var string
+ */
+ var $func_call;
+
+ /**
+ * Whether MySQL is used as the database engine.
+ *
+ * Set in WPDB::db_connect() to true, by default. This is used when checking
+ * against the required MySQL version for WordPress. Normally, a replacement
+ * database drop-in (db.php) will skip these checks, but setting this to true
+ * will force the checks to occur.
+ *
+ * @since 3.3.0
+ * @access public
+ * @var bool
+ */
+ public $is_mysql = null;
+
+ /**
+ * 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 && WP_DEBUG_DISPLAY )
+ $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;
+ }
+
+ /**
+ * PHP5 style magic getter, used to lazy-load expensive data.
+ *
+ * @since 3.5.0
+ *
+ * @param string $name The private member to get, and optionally process
+ * @return mixed The private member
+ */
+ function __get( $name ) {
+ if ( 'col_info' == $name )
+ $this->load_col_info();
+
+ return $this->$name;
+ }
+
+ /**
+ * Magic function, for backwards compatibility
+ *
+ * @since 3.5.0
+ *
+ * @param string $name The private member to set
+ * @param mixed $value The value to set
+ */
+ function __set( $name, $value ) {
+ $this->$name = $value;
+ }
+
+ /**
+ * Magic function, for backwards compatibility
+ *
+ * @since 3.5.0
+ *
+ * @param string $name The private member to check
+ *
+ * @return bool If the member is set or not
+ */
+ function __isset( $name ) {
+ return isset( $this->$name );
+ }
+
+ /**
+ * Magic function, for backwards compatibility
+ *
+ * @since 3.5.0
+ *
+ * @param string $name The private member to unset
+ */
+ function __unset( $name ) {
+ unset( $this->$name );
+ }
+
+ /**
+ * 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' ) && ! empty( $charset ) ) {
+ if ( function_exists( 'mysql_set_charset' ) && $this->has_cap( 'set_charset' ) ) {
+ mysql_set_charset( $charset, $dbh );
+ } 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.
+ * @param bool $set_table_names Optional. Whether the table names, e.g. wpdb::$posts, should be updated or not.
+ * @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', 'Invalid database 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 $this->base_prefix;
+ }
+ }
+
+ /**
+ * Returns an array of WordPress tables.
+ *
+ * Also allows for the CUSTOM_USER_TABLE and CUSTOM_USER_META_TABLE to
+ * override the WordPress users and usermeta tables that would otherwise
+ * be determined by the prefix.
+ *
+ * The scope argument can take one of the following:
+ *
+ * 'all' - returns 'all' and 'global' tables. No old tables are returned.
+ * 'blog' - returns the blog-level tables for the queried blog.
+ * 'global' - returns the global tables for the installation, returning multisite tables only if running multisite.
+ * 'ms_global' - returns the multisite global tables, regardless if current installation is multisite.
+ * 'old' - returns tables which are deprecated.
+ *
+ * @since 3.0.0
+ * @uses wpdb::$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;
+ wp_load_translations_early();
+ $this->bail( sprintf( __( '<h1>Can’t select database</h1>
+<p>We were able to connect to the database server (which means your username and password is okay) but not able to select the <code>%1$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>' ), htmlspecialchars( $db, ENT_QUOTES ), htmlspecialchars( $this->dbuser, ENT_QUOTES ) ), 'db_select_fail' );
+ return;
+ }
+ }
+
+ /**
+ * Do not use, deprecated.
+ *
+ * Use esc_sql() or wpdb::prepare() instead.
+ *
+ * @since 2.8.0
+ * @deprecated 3.6.0
+ * @see wpdb::prepare
+ * @see esc_sql()
+ * @access private
+ *
+ * @param string $string
+ * @return string
+ */
+ function _weak_escape( $string ) {
+ if ( func_num_args() === 1 && function_exists( '_deprecated_function' ) )
+ _deprecated_function( __METHOD__, '3.6', 'wpdb::prepare() or esc_sql()' );
+ return addslashes( $string );
+ }
+
+ /**
+ * Real escape, using mysql_real_escape_string()
+ *
+ * @see mysql_real_escape_string()
+ * @since 2.8.0
+ * @access private
+ *
+ * @param string $string to escape
+ * @return string escaped
+ */
+ function _real_escape( $string ) {
+ if ( $this->dbh )
+ return mysql_real_escape_string( $string, $this->dbh );
+
+ $class = get_class( $this );
+ _doing_it_wrong( $class, "$class must set a database connection for use with escaping.", E_USER_NOTICE );
+ return addslashes( $string );
+ }
+
+ /**
+ * Escape data. Works on arrays.
+ *
+ * @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 ( $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;
+ }
+
+ /**
+ * Do not use, deprecated.
+ *
+ * Use esc_sql() or wpdb::prepare() instead.
+ *
+ * @since 0.71
+ * @deprecated 3.6.0
+ * @see wpdb::prepare()
+ * @see esc_sql()
+ *
+ * @param mixed $data
+ * @return mixed
+ */
+ function escape( $data ) {
+ if ( func_num_args() === 1 && function_exists( '_deprecated_function' ) )
+ _deprecated_function( __METHOD__, '3.6', 'wpdb::prepare() or esc_sql()' );
+ if ( is_array( $data ) ) {
+ foreach ( $data as $k => $v ) {
+ if ( is_array( $v ) )
+ $data[$k] = $this->escape( $v, 'recursive' );
+ else
+ $data[$k] = $this->_weak_escape( $v, 'internal' );
+ }
+ } else {
+ $data = $this->_weak_escape( $data, 'internal' );
+ }
+
+ 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 ) {
+ if ( ! is_float( $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 (integer)
+ * %f (float)
+ * %s (string)
+ * %% (literal percentage sign - no argument needed)
+ *
+ * All of %d, %f, 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 (integer), %f (float), and %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, $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( '|(?<!%)%f|' , '%F', $query ); // Force floats to be locale unaware
+ $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;
+
+ wp_load_translations_early();
+
+ if ( $caller = $this->get_caller() )
+ $error_str = sprintf( __( 'WordPress database error %1$s for query %2$s made by %3$s' ), $str, $this->last_query, $caller );
+ else
+ $error_str = sprintf( __( 'WordPress database error %1$s for query %2$s' ), $str, $this->last_query );
+
+ 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;
+ $this->rows_affected = $this->num_rows = 0;
+ $this->last_error = '';
+
+ if ( is_resource( $this->result ) )
+ mysql_free_result( $this->result );
+ }
+
+ /**
+ * Connect to and select database
+ *
+ * @since 3.0.0
+ */
+ function db_connect() {
+
+ $this->is_mysql = true;
+
+ $new_link = defined( 'MYSQL_NEW_LINK' ) ? MYSQL_NEW_LINK : true;
+ $client_flags = defined( 'MYSQL_CLIENT_FLAGS' ) ? MYSQL_CLIENT_FLAGS : 0;
+
+ if ( WP_DEBUG ) {
+ $this->dbh = mysql_connect( $this->dbhost, $this->dbuser, $this->dbpassword, $new_link, $client_flags );
+ } else {
+ $this->dbh = @mysql_connect( $this->dbhost, $this->dbuser, $this->dbpassword, $new_link, $client_flags );
+ }
+
+ if ( !$this->dbh ) {
+ wp_load_translations_early();
+ $this->bail( sprintf( __( "
+<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>
+" ), htmlspecialchars( $this->dbhost, ENT_QUOTES ) ), '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;
+ /**
+ * Filter the database query.
+ *
+ * Some queries are made before the plugins have been loaded, and thus cannot be filtered with this method.
+ *
+ * @since 2.1.0
+ * @param string $query Database query.
+ */
+ $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 ) ) {
+ // Clear insert_id on a subsequent failed insert.
+ if ( $this->insert_id && preg_match( '/^\s*(insert|replace)\s/i', $query ) )
+ $this->insert_id = 0;
+
+ $this->print_error();
+ return false;
+ }
+
+ if ( preg_match( '/^\s*(create|alter|truncate|drop)\s/i', $query ) ) {
+ $return_val = $this->result;
+ } elseif ( preg_match( '/^\s*(insert|delete|update|replace)\s/i', $query ) ) {
+ $this->rows_affected = mysql_affected_rows( $this->dbh );
+ // Take note of the insert_id
+ if ( preg_match( '/^\s*(insert|replace)\s/i', $query ) ) {
+ $this->insert_id = mysql_insert_id($this->dbh);
+ }
+ // Return number of rows affected
+ $return_val = $this->rows_affected;
+ } else {
+ $num_rows = 0;
+ while ( $row = @mysql_fetch_object( $this->result ) ) {
+ $this->last_result[$num_rows] = $row;
+ $num_rows++;
+ }
+
+ // 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', '%f', '%s' (integer, float, 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', '%f', '%s' (integer, float, 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', '%f', '%s' (integer, float, string). If omitted, all values in $data will be treated as strings unless otherwise specified in wpdb::$field_types.
+ * @param string $type Optional. What type of operation is this? INSERT or REPLACE. Defaults to INSERT.
+ * @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;
+ $this->insert_id = 0;
+ $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', '%f', '%s' (integer, float, string). If omitted, all values in $data will be treated as strings unless otherwise specified in wpdb::$field_types.
+ * @param array|string $where_format Optional. An array of formats to be mapped to each of the values in $where. If string, that format will be used for all of the items in $where. A format is one of '%d', '%f', '%s' (integer, float, string). If omitted, all values in $where will be treated as strings.
+ * @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( $where ) ) ) );
+ }
+
+ /**
+ * Delete a row in the table
+ *
+ * <code>
+ * wpdb::delete( 'table', array( 'ID' => 1 ) )
+ * wpdb::delete( 'table', array( 'ID' => 1 ), array( '%d' ) )
+ * </code>
+ *
+ * @since 3.4.0
+ * @see wpdb::prepare()
+ * @see wpdb::$field_types
+ * @see wp_set_wpdb_vars()
+ *
+ * @param string $table table name
+ * @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 $where_format Optional. An array of formats to be mapped to each of the values in $where. If string, that format will be used for all of the items in $where. A format is one of '%d', '%f', '%s' (integer, float, string). If omitted, all values in $where will be treated as strings unless otherwise specified in wpdb::$field_types.
+ * @return int|false The number of rows updated, or false on error.
+ */
+ function delete( $table, $where, $where_format = null ) {
+ if ( ! is_array( $where ) )
+ return false;
+
+ $bits = $wheres = array();
+
+ $where_formats = $where_format = (array) $where_format;
+
+ foreach ( 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 = "DELETE FROM $table WHERE " . implode( ' AND ', $wheres );
+ return $this->query( $this->prepare( $sql, $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 specified 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( " \$db->get_row(string query, output type, int offset) -- Output type must be one of: OBJECT, ARRAY_A, ARRAY_N" );
+ }
+ }
+
+ /**
+ * 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 ) {
+ $var_by_ref = get_object_vars( $row );
+ $key = array_shift( $var_by_ref );
+ 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;
+ }
+
+ /**
+ * Load the column metadata from the last query.
+ *
+ * @since 3.5.0
+ *
+ * @access protected
+ */
+ protected function load_col_info() {
+ if ( $this->col_info )
+ return;
+
+ for ( $i = 0; $i < @mysql_num_fields( $this->result ); $i++ ) {
+ $this->col_info[ $i ] = @mysql_fetch_field( $this->result, $i );
+ }
+ }
+
+ /**
+ * 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 ) {
+ $this->load_col_info();
+
+ 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() {
+ $this->time_start = microtime( true );
+ return true;
+ }
+
+ /**
+ * Stops the debugging timer.
+ *
+ * @since 1.5.0
+ *
+ * @return float Total time spent on the query, in seconds
+ */
+ function timer_stop() {
+ return ( microtime( true ) - $this->time_start );
+ }
+
+ /**
+ * Wraps errors in a nice header and footer and dies.
+ *
+ * Will not die if wpdb::$show_errors is false.
+ *
+ * @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
+ * @deprecated 3.5.0
+ * @deprecated Use wpdb::has_cap( 'collation' )
+ *
+ * @return bool True if collation is supported, false if version does not
+ */
+ function supports_collation() {
+ _deprecated_function( __FUNCTION__, '3.5', 'wpdb::has_cap( \'collation\' )' );
+ return $this->has_cap( 'collation' );
+ }
+
+ /**
+ * The database character collate.
+ *
+ * @since 3.5.0
+ *
+ * @return string The database character collate.
+ */
+ public function get_charset_collate() {
+ $charset_collate = '';
+
+ if ( ! empty( $this->charset ) )
+ $charset_collate = "DEFAULT CHARACTER SET $this->charset";
+ if ( ! empty( $this->collate ) )
+ $charset_collate .= " COLLATE $this->collate";
+
+ return $charset_collate;
+ }
+
+ /**
+ * Determine if a database supports a particular feature.
+ *
+ * @since 2.7.0
+ * @see wpdb::db_version()
+ *
+ * @param string $db_cap The feature to check for.
+ * @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 2.7.0
+ case 'subqueries' : // @since 2.7.0
+ 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() {
+ return wp_debug_backtrace_summary( __CLASS__ );
+ }
+
+ /**
+ * 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 ) );
+ }
+}