'%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 */ public $field_types = array(); /** * Database table columns charset * * @since 2.2.0 * @access public * @var string */ public $charset; /** * Database table columns collate * * @since 2.2.0 * @access public * @var string */ public $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 */ public $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; /** * A list of incompatible SQL modes. * * @since 3.9.0 * @access protected * @var array */ protected $incompatible_modes = array( 'NO_ZERO_DATE', 'ONLY_FULL_GROUP_BY', 'STRICT_TRANS_TABLES', 'STRICT_ALL_TABLES', 'TRADITIONAL' ); /** * Whether to use mysqli over mysql. * * @since 3.9.0 * @access private * @var bool */ private $use_mysqli = false; /** * Whether we've managed to successfully connect at some point * * @since 3.9.0 * @access private * @var bool */ private $has_connected = false; /** * 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 https://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 */ public function __construct( $dbuser, $dbpassword, $dbname, $dbhost ) { register_shutdown_function( array( $this, '__destruct' ) ); if ( WP_DEBUG && WP_DEBUG_DISPLAY ) $this->show_errors(); /* Use ext/mysqli if it exists and: * - WP_USE_EXT_MYSQL is defined as false, or * - We are a development version of WordPress, or * - We are running PHP 5.5 or greater, or * - ext/mysql is not loaded. */ if ( function_exists( 'mysqli_connect' ) ) { if ( defined( 'WP_USE_EXT_MYSQL' ) ) { $this->use_mysqli = ! WP_USE_EXT_MYSQL; } elseif ( version_compare( phpversion(), '5.5', '>=' ) || ! function_exists( 'mysql_connect' ) ) { $this->use_mysqli = true; } elseif ( false !== strpos( $GLOBALS['wp_version'], '-' ) ) { $this->use_mysqli = true; } } $this->init_charset(); $this->dbuser = $dbuser; $this->dbpassword = $dbpassword; $this->dbname = $dbname; $this->dbhost = $dbhost; // wp-config.php creation will manually connect when ready. if ( defined( 'WP_SETUP_CONFIG' ) ) { return; } $this->db_connect(); } /** * PHP5 style destructor and will run when database object is destroyed. * * @see wpdb::__construct() * @since 2.0.8 * @return bool true */ public 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 */ public 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 */ public 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 */ public function __isset( $name ) { return isset( $this->$name ); } /** * Magic function, for backwards compatibility. * * @since 3.5.0 * * @param string $name The private member to unset */ public function __unset( $name ) { unset( $this->$name ); } /** * Set $this->charset and $this->collate * * @since 3.1.0 */ public 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 Optional. The character set. Default null. * @param string $collate Optional. The collation. Default null. */ public 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 ( $this->use_mysqli ) { if ( function_exists( 'mysqli_set_charset' ) && $this->has_cap( 'set_charset' ) ) { mysqli_set_charset( $dbh, $charset ); } else { $query = $this->prepare( 'SET NAMES %s', $charset ); if ( ! empty( $collate ) ) $query .= $this->prepare( ' COLLATE %s', $collate ); mysqli_query( $query, $dbh ); } } else { 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 ); } } } } /** * Change the current SQL mode, and ensure its WordPress compatibility. * * If no modes are passed, it will ensure the current MySQL server * modes are compatible. * * @since 3.9.0 * * @param array $modes Optional. A list of SQL modes to set. */ public function set_sql_mode( $modes = array() ) { if ( empty( $modes ) ) { if ( $this->use_mysqli ) { $res = mysqli_query( $this->dbh, 'SELECT @@SESSION.sql_mode' ); } else { $res = mysql_query( 'SELECT @@SESSION.sql_mode', $this->dbh ); } if ( empty( $res ) ) { return; } if ( $this->use_mysqli ) { $modes_array = mysqli_fetch_array( $res ); if ( empty( $modes_array[0] ) ) { return; } $modes_str = $modes_array[0]; } else { $modes_str = mysql_result( $res, 0 ); } if ( empty( $modes_str ) ) { return; } $modes = explode( ',', $modes_str ); } $modes = array_change_key_case( $modes, CASE_UPPER ); /** * Filter the list of incompatible SQL modes to exclude. * * @since 3.9.0 * * @param array $incompatible_modes An array of incompatible modes. */ $incompatible_modes = (array) apply_filters( 'incompatible_sql_modes', $this->incompatible_modes ); foreach( $modes as $i => $mode ) { if ( in_array( $mode, $incompatible_modes ) ) { unset( $modes[ $i ] ); } } $modes_str = implode( ',', $modes ); if ( $this->use_mysqli ) { mysqli_query( $this->dbh, "SET SESSION sql_mode='$modes_str'" ); } else { mysql_query( "SET SESSION sql_mode='$modes_str'", $this->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 */ public 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 int previous blog id */ public 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. * * @since 3.0.0 * @param int $blog_id Optional. * @return string Blog prefix. */ public 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 * * @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. */ public 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(); } 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. */ public function select( $db, $dbh = null ) { if ( is_null($dbh) ) $dbh = $this->dbh; if ( $this->use_mysqli ) { $success = @mysqli_select_db( $dbh, $db ); } else { $success = @mysql_select_db( $db, $dbh ); } if ( ! $success ) { $this->ready = false; if ( ! did_action( 'template_redirect' ) ) { wp_load_translations_early(); $this->bail( sprintf( __( '

Can’t select database

We were able to connect to the database server (which means your username and password is okay) but not able to select the %1$s database.

If you don\'t know how to set up a database you should contact your host. If all else fails you may find help at the WordPress Support Forums.

' ), 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 mysqli_real_escape_string() or mysql_real_escape_string() * * @see mysqli_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 ) { if ( $this->use_mysqli ) { return mysqli_real_escape_string( $this->dbh, $string ); } else { return mysql_real_escape_string( $string, $this->dbh ); } } $class = get_class( $this ); if ( function_exists( '__' ) ) { _doing_it_wrong( $class, sprintf( __( '%s must set a database connection for use with escaping.' ), $class ), E_USER_NOTICE ); } else { _doing_it_wrong( $class, sprintf( '%s must set a database connection for use with escaping.', $class ), 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 */ public 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 $string to escape * @return void */ public function escape_by_ref( &$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. * * 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' ); * * @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 */ public function prepare( $query, $args ) { if ( is_null( $query ) ) return; // This is not meant to be foolproof -- but it will catch obviously incorrect usage. if ( strpos( $query, '%' ) === false ) { _doing_it_wrong( 'wpdb::prepare', sprintf( __( 'The query argument of %s must have a placeholder.' ), 'wpdb::prepare()' ), '3.9' ); } $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( '|(?esc_like( $find ) . $wild; * $sql = $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE post_content LIKE %s", $like ); * * Example Escape Chain: * $sql = esc_sql( $wpdb->esc_like( $input ) ); * * @since 4.0.0 * @access public * * @param string $text The raw text to be escaped. The input typed by the user should have no * extra or deleted slashes. * @return string Text in the form of a LIKE phrase. The output is not SQL safe. Call $wpdb::prepare() * or real_escape next. */ public function esc_like( $text ) { return addcslashes( $text, '_%\\' ); } /** * 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 false|null False if the showing of errors is disabled. */ public function print_error( $str = '' ) { global $EZSQL_ERROR; if ( !$str ) { if ( $this->use_mysqli ) { $str = mysqli_error( $this->dbh ); } else { $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 "

WordPress database error: [$str]
$query

"; } } /** * 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. */ public 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 */ public 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 */ public 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 */ public 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 ( $this->use_mysqli && $this->result instanceof mysqli_result ) { mysqli_free_result( $this->result ); $this->result = null; // Sanity check before using the handle if ( empty( $this->dbh ) || !( $this->dbh instanceof mysqli ) ) { return; } // Clear out any results from a multi-query while ( mysqli_more_results( $this->dbh ) ) { mysqli_next_result( $this->dbh ); } } else if ( is_resource( $this->result ) ) { mysql_free_result( $this->result ); } } /** * Connect to and select database. * * If $allow_bail is false, the lack of database connection will need * to be handled manually. * * @since 3.0.0 * @since 3.9.0 $allow_bail parameter added. * * @param bool $allow_bail Optional. Allows the function to bail. Default true. * @return null|bool True with a successful connection, false on failure. */ public function db_connect( $allow_bail = true ) { $this->is_mysql = true; /* * Deprecated in 3.9+ when using MySQLi. No equivalent * $new_link parameter exists for mysqli_* functions. */ $new_link = defined( 'MYSQL_NEW_LINK' ) ? MYSQL_NEW_LINK : true; $client_flags = defined( 'MYSQL_CLIENT_FLAGS' ) ? MYSQL_CLIENT_FLAGS : 0; if ( $this->use_mysqli ) { $this->dbh = mysqli_init(); // mysqli_real_connect doesn't support the host param including a port or socket // like mysql_connect does. This duplicates how mysql_connect detects a port and/or socket file. $port = null; $socket = null; $host = $this->dbhost; $port_or_socket = strstr( $host, ':' ); if ( ! empty( $port_or_socket ) ) { $host = substr( $host, 0, strpos( $host, ':' ) ); $port_or_socket = substr( $port_or_socket, 1 ); if ( 0 !== strpos( $port_or_socket, '/' ) ) { $port = intval( $port_or_socket ); $maybe_socket = strstr( $port_or_socket, ':' ); if ( ! empty( $maybe_socket ) ) { $socket = substr( $maybe_socket, 1 ); } } else { $socket = $port_or_socket; } } if ( WP_DEBUG ) { mysqli_real_connect( $this->dbh, $host, $this->dbuser, $this->dbpassword, null, $port, $socket, $client_flags ); } else { @mysqli_real_connect( $this->dbh, $host, $this->dbuser, $this->dbpassword, null, $port, $socket, $client_flags ); } if ( $this->dbh->connect_errno ) { $this->dbh = null; /* It's possible ext/mysqli is misconfigured. Fall back to ext/mysql if: * - We haven't previously connected, and * - WP_USE_EXT_MYSQL isn't set to false, and * - ext/mysql is loaded. */ $attempt_fallback = true; if ( $this->has_connected ) { $attempt_fallback = false; } else if ( defined( 'WP_USE_EXT_MYSQL' ) && ! WP_USE_EXT_MYSQL ) { $attempt_fallback = false; } else if ( ! function_exists( 'mysql_connect' ) ) { $attempt_fallback = false; } if ( $attempt_fallback ) { $this->use_mysqli = false; $this->db_connect(); } } } else { 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 && $allow_bail ) { wp_load_translations_early(); // Load custom DB error template, if present. if ( file_exists( WP_CONTENT_DIR . '/db-error.php' ) ) { require_once( WP_CONTENT_DIR . '/db-error.php' ); die(); } $this->bail( sprintf( __( "

Error establishing a database connection

This either means that the username and password information in your wp-config.php file is incorrect or we can't contact the database server at %s. This could mean your host's database server is down.

If you're unsure what these terms mean you should probably contact your host. If you still need help you can always visit the WordPress Support Forums.

" ), htmlspecialchars( $this->dbhost, ENT_QUOTES ) ), 'db_connect_fail' ); return false; } else if ( $this->dbh ) { $this->has_connected = true; $this->set_charset( $this->dbh ); $this->set_sql_mode(); $this->ready = true; $this->select( $this->dbname, $this->dbh ); return true; } return false; } /** * Check that the connection to the database is still up. If not, try to reconnect. * * If this function is unable to reconnect, it will forcibly die, or if after the * the template_redirect hook has been fired, return false instead. * * If $allow_bail is false, the lack of database connection will need * to be handled manually. * * @since 3.9.0 * * @param bool $allow_bail Optional. Allows the function to bail. Default true. * @return bool|null True if the connection is up. */ public function check_connection( $allow_bail = true ) { if ( $this->use_mysqli ) { if ( @mysqli_ping( $this->dbh ) ) { return true; } } else { if ( @mysql_ping( $this->dbh ) ) { return true; } } $error_reporting = false; // Disable warnings, as we don't want to see a multitude of "unable to connect" messages if ( WP_DEBUG ) { $error_reporting = error_reporting(); error_reporting( $error_reporting & ~E_WARNING ); } for ( $tries = 1; $tries <= $this->reconnect_retries; $tries++ ) { // On the last try, re-enable warnings. We want to see a single instance of the // "unable to connect" message on the bail() screen, if it appears. if ( $this->reconnect_retries === $tries && WP_DEBUG ) { error_reporting( $error_reporting ); } if ( $this->db_connect( false ) ) { if ( $error_reporting ) { error_reporting( $error_reporting ); } return true; } sleep( 1 ); } // If template_redirect has already happened, it's too late for wp_die()/dead_db(). // Let's just return and hope for the best. if ( did_action( 'template_redirect' ) ) { return false; } if ( ! $allow_bail ) { return false; } // We weren't able to reconnect, so we better bail. $this->bail( sprintf( ( "

Error reconnecting to the database

This means that we lost contact with the database server at %s. This could mean your host's database server is down.

If you're unsure what these terms mean you should probably contact your host. If you still need help you can always visit the WordPress Support Forums.

" ), htmlspecialchars( $this->dbhost, ENT_QUOTES ) ), 'db_connect_fail' ); // Call dead_db() if bail didn't die, because this database is no more. It has ceased to be (at least temporarily). dead_db(); } /** * 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 */ public 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 ); $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; $this->_do_query( $query ); // MySQL server has gone away, try to reconnect $mysql_errno = 0; if ( ! empty( $this->dbh ) ) { if ( $this->use_mysqli ) { $mysql_errno = mysqli_errno( $this->dbh ); } else { $mysql_errno = mysql_errno( $this->dbh ); } } if ( empty( $this->dbh ) || 2006 == $mysql_errno ) { if ( $this->check_connection() ) { $this->_do_query( $query ); } else { $this->insert_id = 0; return false; } } // If there is an error then take note of it.. if ( $this->use_mysqli ) { $this->last_error = mysqli_error( $this->dbh ); } else { $this->last_error = mysql_error( $this->dbh ); } if ( $this->last_error ) { // 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 ) ) { if ( $this->use_mysqli ) { $this->rows_affected = mysqli_affected_rows( $this->dbh ); } else { $this->rows_affected = mysql_affected_rows( $this->dbh ); } // Take note of the insert_id if ( preg_match( '/^\s*(insert|replace)\s/i', $query ) ) { if ( $this->use_mysqli ) { $this->insert_id = mysqli_insert_id( $this->dbh ); } else { $this->insert_id = mysql_insert_id( $this->dbh ); } } // Return number of rows affected $return_val = $this->rows_affected; } else { $num_rows = 0; if ( $this->use_mysqli && $this->result instanceof mysqli_result ) { while ( $row = @mysqli_fetch_object( $this->result ) ) { $this->last_result[$num_rows] = $row; $num_rows++; } } else if ( is_resource( $this->result ) ) { 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; } /** * Internal function to perform the mysql_query() call. * * @since 3.9.0 * * @access private * @see wpdb::query() * * @param string $query The query to run. */ private function _do_query( $query ) { if ( defined( 'SAVEQUERIES' ) && SAVEQUERIES ) { $this->timer_start(); } if ( $this->use_mysqli ) { $this->result = @mysqli_query( $this->dbh, $query ); } else { $this->result = @mysql_query( $query, $this->dbh ); } $this->num_queries++; if ( defined( 'SAVEQUERIES' ) && SAVEQUERIES ) { $this->queries[] = array( $query, $this->timer_stop(), $this->get_caller() ); } } /** * Insert a row into a table. * * wpdb::insert( 'table', array( 'column' => 'foo', 'field' => 'bar' ) ) * wpdb::insert( 'table', array( 'column' => 'foo', 'field' => 1337 ), array( '%s', '%d' ) ) * * @since 2.5.0 * @see wpdb::prepare() * @see wpdb::$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. */ public function insert( $table, $data, $format = null ) { return $this->_insert_replace_helper( $table, $data, $format, 'INSERT' ); } /** * Replace a row into a table. * * wpdb::replace( 'table', array( 'column' => 'foo', 'field' => 'bar' ) ) * wpdb::replace( 'table', array( 'column' => 'foo', 'field' => 1337 ), array( '%s', '%d' ) ) * * @since 3.0.0 * @see wpdb::prepare() * @see wpdb::$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. */ public 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, $data ) ); } /** * Update a row in the table * * wpdb::update( 'table', array( 'column' => 'foo', 'field' => 'bar' ), array( 'ID' => 1 ) ) * wpdb::update( 'table', array( 'column' => 'foo', 'field' => 1337 ), array( 'ID' => 1 ), array( '%s', '%d' ), array( '%d' ) ) * * @since 2.5.0 * @see wpdb::prepare() * @see wpdb::$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. */ public 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( $where ) ) ) ); } /** * Delete a row in the table * * wpdb::delete( 'table', array( 'ID' => 1 ) ) * wpdb::delete( 'table', array( 'ID' => 1 ), array( '%d' ) ) * * @since 3.4.0 * @see wpdb::prepare() * @see wpdb::$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. */ public function delete( $table, $where, $where_format = null ) { if ( ! is_array( $where ) ) return false; $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 */ public 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 */ public 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; } elseif ( strtoupper( $output ) === OBJECT ) { // Back compat for OBJECT being previously case insensitive. return $this->last_result[$y] ? $this->last_result[$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. */ public 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 */ public 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; } elseif ( strtoupper( $output ) === OBJECT ) { // Back compat for OBJECT being previously case insensitive. return $this->last_result; } 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; if ( $this->use_mysqli ) { for ( $i = 0; $i < @mysqli_num_fields( $this->result ); $i++ ) { $this->col_info[ $i ] = @mysqli_fetch_field( $this->result ); } } else { 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 */ public 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 bool */ public 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 */ public 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 */ public 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 */ public 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(), $required_mysql_version, '<') ) return new WP_Error('database_version', sprintf( __( 'ERROR: WordPress %1$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 */ public 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 * @since 4.1.0 Support was added for the 'utf8mb4' feature. * * @see wpdb::db_version() * * @param string $db_cap The feature to check for. Accepts 'collation', * 'group_concat', 'subqueries', 'set_charset', * or 'utf8mb4'. * @return bool Whether the database feature is supported, false otherwise. */ public 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', '>=' ); case 'utf8mb4' : // @since 4.1.0 return version_compare( $version, '5.5.3', '>=' ); } 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 */ public function get_caller() { return wp_debug_backtrace_summary( __CLASS__ ); } /** * The database version number. * * @since 2.7.0 * * @return null|string Null on failure, version number on success. */ public function db_version() { if ( $this->use_mysqli ) { $server_info = mysqli_get_server_info( $this->dbh ); } else { $server_info = mysql_get_server_info( $this->dbh ); } return preg_replace( '/[^0-9.].*/', '', $server_info ); } }