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wpdb.php

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<?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 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;
 
/**
* 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 )
$this->show_errors();
 
 
 
$this->dbuser = $dbuser;
$this->dbpassword = $dbpassword;
$this->dbname = $dbname;
$this->dbhost = $dbhost;
 
$this->init_charset();
 
$this->db_connect();
}
 
/**
* 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;
}
 
/**
* 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;
}
 
/**
* 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.
* @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', /*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 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;
$this->bail( sprintf( /*WP_I18N_DB_SELECT_DB*/'<h1>Can&#8217;t select database</h1>
<p>We were able to connect to the database server (which means your username and password is okay) but not able to select the <code>%1$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 (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 = 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' ) )
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() {
 
$this->is_mysql = true;
 
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', '%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;
$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 ) ) ) );
}
 
/**
* 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(/*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 ) {
$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;
}
 
/**
* 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 = $message;
return false;
}
die($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 ) );
}
}
 
?>

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