' . sprintf(
/* translators: %s: database name */
__( 'We were able to connect to the database server (which means your username and password is okay) but not able to select the %s database.' ),
'' . htmlspecialchars( $db, ENT_QUOTES ) . ''
) . "
' . htmlspecialchars( $this->dbuser, ENT_QUOTES ) . '',
'' . htmlspecialchars( $db, ENT_QUOTES ) . ''
) . "username_%1$s. Could that be the problem?' ),
htmlspecialchars( $db, ENT_QUOTES )
). "' . sprintf( /* translators: %s: support forums URL */ __( '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.' ), __( 'https://wordpress.org/support/' ) ) . "
\n"; $this->bail( $message, 'db_select_fail' ); } } } /** * Do not use, deprecated. * * Use esc_sql() or wpdb::prepare() instead. * * @since 2.8.0 * @deprecated 3.6.0 Use wpdb::prepare() * @see wpdb::prepare * @see esc_sql() * * @param string $string * @return string */ function _weak_escape( $string ) { if ( func_num_args() === 1 && function_exists( '_deprecated_function' ) ) _deprecated_function( __METHOD__, '3.6.0', '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 * * @param string $string to escape * @return string escaped */ function _real_escape( $string ) { if ( $this->dbh ) { if ( $this->use_mysqli ) { $escaped = mysqli_real_escape_string( $this->dbh, $string ); } else { $escaped = mysql_real_escape_string( $string, $this->dbh ); } } else { $class = get_class( $this ); if ( function_exists( '__' ) ) { /* translators: %s: database access abstraction class, usually wpdb or a class extending wpdb */ _doing_it_wrong( $class, sprintf( __( '%s must set a database connection for use with escaping.' ), $class ), '3.6.0' ); } else { _doing_it_wrong( $class, sprintf( '%s must set a database connection for use with escaping.', $class ), '3.6.0' ); } $escaped = addslashes( $string ); } return $this->add_placeholder_escape( $escaped ); } /** * Escape data. Works on arrays. * * @uses wpdb::_real_escape() * @since 2.8.0 * * @param string|array $data * @return string|array escaped */ public 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 Use wpdb::prepare() * @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__, '3.6.0', '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 $string to escape */ public function escape_by_ref( &$string ) { if ( ! is_float( $string ) ) $string = $this->_real_escape( $string ); } /** * Prepares a SQL query for safe execution. Uses sprintf()-like syntax. * * The following placeholders can be used in the query string: * %d (integer) * %f (float) * %s (string) * * All placeholders MUST be left unquoted in the query string. A corresponding argument MUST be passed for each placeholder. * * For compatibility with old behavior, numbered or formatted string placeholders (eg, %1$s, %5s) will not have quotes * added by this function, so should be passed with appropriate quotes around them for your usage. * * Literal percentage signs (%) in the query string must be written as %%. Percentage wildcards (for example, * to use in LIKE syntax) must be passed via a substitution argument containing the complete LIKE string, these * cannot be inserted directly in the query string. Also see {@see esc_like()}. * * Arguments may be passed as individual arguments to the method, or as a single array containing all arguments. A combination * of the two is not supported. * * Examples: * $wpdb->prepare( "SELECT * FROM `table` WHERE `column` = %s AND `field` = %d OR `other_field` LIKE %s", array( 'foo', 1337, '%bar' ) ); * $wpdb->prepare( "SELECT DATE_FORMAT(`field`, '%%c') FROM `table` WHERE `column` = %s", 'foo' ); * * @link https://secure.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 with an array of arguments, * or the first variable to substitute into the query's placeholders if being called with individual arguments. * @param mixed $args,... further variables to substitute into the query's placeholders if being called wih individual arguments. * @return string|void Sanitized query string, if there is a query 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 ) { wp_load_translations_early(); _doing_it_wrong( 'wpdb::prepare', sprintf( __( 'The query argument of %s must have a placeholder.' ), 'wpdb::prepare()' ), '3.9.0' ); } $args = func_get_args(); array_shift( $args ); // If args were passed as an array (as in vsprintf), move them up. $passed_as_array = false; if ( is_array( $args[0] ) && count( $args ) == 1 ) { $passed_as_array = true; $args = $args[0]; } foreach ( $args as $arg ) { if ( ! is_scalar( $arg ) && ! is_null( $arg ) ) { wp_load_translations_early(); _doing_it_wrong( 'wpdb::prepare', sprintf( __( 'Unsupported value type (%s).' ), gettype( $arg ) ), '4.8.2' ); } } /* * Specify the formatting allowed in a placeholder. The following are allowed: * * - Sign specifier. eg, $+d * - Numbered placeholders. eg, %1$s * - Padding specifier, including custom padding characters. eg, %05s, %'#5s * - Alignment specifier. eg, %05-s * - Precision specifier. eg, %.2f */ $allowed_format = '(?:[1-9][0-9]*[$])?[-+0-9]*(?: |0|\'.)?[-+0-9]*(?:\.[0-9]+)?'; /* * If a %s placeholder already has quotes around it, removing the existing quotes and re-inserting them * ensures the quotes are consistent. * * For backwards compatibility, this is only applied to %s, and not to placeholders like %1$s, which are frequently * used in the middle of longer strings, or as table name placeholders. */ $query = str_replace( "'%s'", '%s', $query ); // Strip any existing single quotes. $query = str_replace( '"%s"', '%s', $query ); // Strip any existing double quotes. $query = preg_replace( '/(?add_placeholder_escape( $query ); } /** * First half of escaping for LIKE special characters % and _ before preparing for MySQL. * * Use this only before wpdb::prepare() or esc_sql(). Reversing the order is very bad for security. * * Example Prepared Statement: * * $wild = '%'; * $find = 'only 43% of planets'; * $like = $wild . $wpdb->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 * * @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|void 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() ) { /* translators: 1: Database error message, 2: SQL query, 3: Name of the calling function */ $error_str = sprintf( __( 'WordPress database error %1$s for query %2$s made by %3$s' ), $str, $this->last_query, $caller ); } else { /* translators: 1: Database error message, 2: SQL query */ $error_str = sprintf( __( 'WordPress database error %1$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 = sprintf( "%s [%s]\n%s\n", __( 'WordPress database error:' ), $str, $this->last_query ); if ( defined( 'ERRORLOGFILE' ) ) { error_log( $msg, 3, ERRORLOGFILE ); } if ( defined( 'DIEONDBERROR' ) ) { wp_die( $msg ); } } else { $str = htmlspecialchars( $str, ENT_QUOTES ); $query = htmlspecialchars( $this->last_query, ENT_QUOTES ); printf( '%s [%s]%s
' . sprintf(
/* translators: 1: wp-config.php. 2: database host */
__( 'This either means that the username and password information in your %1$s file is incorrect or we can’t contact the database server at %2$s. This could mean your host’s database server is down.' ),
'wp-config.php',
'' . htmlspecialchars( $this->dbhost, ENT_QUOTES ) . ''
) . "
' . sprintf( /* translators: %s: support forums URL */ __( '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.' ), __( 'https://wordpress.org/support/' ) ) . "
\n"; $this->bail( $message, 'db_connect_fail' ); return false; } elseif ( $this->dbh ) { if ( ! $this->has_connected ) { $this->init_charset(); } $this->has_connected = true; $this->set_charset( $this->dbh ); $this->ready = true; $this->set_sql_mode(); $this->select( $this->dbname, $this->dbh ); return true; } return false; } /** * Parse the DB_HOST setting to interpret it for mysqli_real_connect. * * 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. * * @since 4.9.0 * * @param string $host The DB_HOST setting to parse. * @return array|bool Array containing the host, the port, the socket and whether * it is an IPv6 address, in that order. If $host couldn't be parsed, * returns false. */ public function parse_db_host( $host ) { $port = null; $socket = null; $is_ipv6 = false; // First peel off the socket parameter from the right, if it exists. $socket_pos = strpos( $host, ':/' ); if ( $socket_pos !== false ) { $socket = substr( $host, $socket_pos + 1 ); $host = substr( $host, 0, $socket_pos ); } // We need to check for an IPv6 address first. // An IPv6 address will always contain at least two colons. if ( substr_count( $host, ':' ) > 1 ) { $pattern = '#^(?:\[)?(?P' . sprintf(
/* translators: %s: database host */
__( 'This means that we lost contact with the database server at %s. This could mean your host’s database server is down.' ),
'' . htmlspecialchars( $this->dbhost, ENT_QUOTES ) . ''
) . "
' . sprintf( /* translators: %s: support forums URL */ __( '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.' ), __( 'https://wordpress.org/support/' ) ) . "
\n"; // We weren't able to reconnect, so we better bail. $this->bail( $message, '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 ) { $this->check_current_query = true; return false; } /** * Filters 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\")"; // If we're writing to the database, make sure the query will write safely. if ( $this->check_current_query && ! $this->check_ascii( $query ) ) { $stripped_query = $this->strip_invalid_text_from_query( $query ); // strip_invalid_text_from_query() can perform queries, so we need // to flush again, just to make sure everything is clear. $this->flush(); if ( $stripped_query !== $query ) { $this->insert_id = 0; return false; } } $this->check_current_query = true; // 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 ) { if ( $this->dbh instanceof mysqli ) { $mysql_errno = mysqli_errno( $this->dbh ); } else { // $dbh is defined, but isn't a real connection. // Something has gone horribly wrong, let's try a reconnect. $mysql_errno = 2006; } } else { if ( is_resource( $this->dbh ) ) { $mysql_errno = mysql_errno( $this->dbh ); } else { $mysql_errno = 2006; } } } 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 ) { if ( $this->dbh instanceof mysqli ) { $this->last_error = mysqli_error( $this->dbh ); } else { $this->last_error = __( 'Unable to retrieve the error message from MySQL' ); } } else { if ( is_resource( $this->dbh ) ) { $this->last_error = mysql_error( $this->dbh ); } else { $this->last_error = __( 'Unable to retrieve the error message from MySQL' ); } } 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++; } } elseif ( 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 * * @see wpdb::query() * * @param string $query The query to run. */ private function _do_query( $query ) { if ( defined( 'SAVEQUERIES' ) && SAVEQUERIES ) { $this->timer_start(); } if ( ! empty( $this->dbh ) && $this->use_mysqli ) { $this->result = mysqli_query( $this->dbh, $query ); } elseif ( ! empty( $this->dbh ) ) { $this->result = mysql_query( $query, $this->dbh ); } $this->num_queries++; if ( defined( 'SAVEQUERIES' ) && SAVEQUERIES ) { $this->queries[] = array( $query, $this->timer_stop(), $this->get_caller() ); } } /** * Generates and returns a placeholder escape string for use in queries returned by ::prepare(). * * @since 4.8.3 * * @return string String to escape placeholders. */ public function placeholder_escape() { static $placeholder; if ( ! $placeholder ) { // If ext/hash is not present, compat.php's hash_hmac() does not support sha256. $algo = function_exists( 'hash' ) ? 'sha256' : 'sha1'; // Old WP installs may not have AUTH_SALT defined. $salt = defined( 'AUTH_SALT' ) && AUTH_SALT ? AUTH_SALT : (string) rand(); $placeholder = '{' . hash_hmac( $algo, uniqid( $salt, true ), $salt ) . '}'; } /* * Add the filter to remove the placeholder escaper. Uses priority 0, so that anything * else attached to this filter will recieve the query with the placeholder string removed. */ if ( ! has_filter( 'query', array( $this, 'remove_placeholder_escape' ) ) ) { add_filter( 'query', array( $this, 'remove_placeholder_escape' ), 0 ); } return $placeholder; } /** * Adds a placeholder escape string, to escape anything that resembles a printf() placeholder. * * @since 4.8.3 * * @param string $query The query to escape. * @return string The query with the placeholder escape string inserted where necessary. */ public function add_placeholder_escape( $query ) { /* * To prevent returning anything that even vaguely resembles a placeholder, * we clobber every % we can find. */ return str_replace( '%', $this->placeholder_escape(), $query ); } /** * Removes the placeholder escape strings from a query. * * @since 4.8.3 * * @param string $query The query from which the placeholder will be removed. * @return string The query with the placeholder removed. */ public function remove_placeholder_escape( $query ) { return str_replace( $this->placeholder_escape(), '%', $query ); } /** * Insert a row into a table. * * wpdb::insert( 'table', array( 'column' => 'foo', 'field' => 'bar' ) ) * wpdb::insert( 'table', array( 'column' => 'foo', 'field' => 1337 ), array( '%s', '%d' ) ) * * @since 2.5.0 * @see wpdb::prepare() * @see wpdb::$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). * Sending a null value will cause the column to be set to NULL - the corresponding format is ignored in this case. * @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). * Sending a null value will cause the column to be set to NULL - the corresponding format is ignored in this case. * @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 $type argument. * * @since 3.0.0 * @see wpdb::prepare() * @see wpdb::$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). * Sending a null value will cause the column to be set to NULL - the corresponding format is ignored in this case. * @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' ) { $this->insert_id = 0; if ( ! in_array( strtoupper( $type ), array( 'REPLACE', 'INSERT' ) ) ) { return false; } $data = $this->process_fields( $table, $data, $format ); if ( false === $data ) { return false; } $formats = $values = array(); foreach ( $data as $value ) { if ( is_null( $value['value'] ) ) { $formats[] = 'NULL'; continue; } $formats[] = $value['format']; $values[] = $value['value']; } $fields = '`' . implode( '`, `', array_keys( $data ) ) . '`'; $formats = implode( ', ', $formats ); $sql = "$type INTO `$table` ($fields) VALUES ($formats)"; $this->check_current_query = false; return $this->query( $this->prepare( $sql, $values ) ); } /** * Update a row in the table * * wpdb::update( 'table', array( 'column' => 'foo', 'field' => 'bar' ), array( 'ID' => 1 ) ) * wpdb::update( 'table', array( 'column' => 'foo', 'field' => 1337 ), array( 'ID' => 1 ), array( '%s', '%d' ), array( '%d' ) ) * * @since 2.5.0 * @see wpdb::prepare() * @see wpdb::$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). * Sending a null value will cause the column to be set to NULL - the corresponding * format is ignored in this case. * @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". * Sending a null value will create an IS NULL comparison - the corresponding format will be ignored in this case. * @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; } $data = $this->process_fields( $table, $data, $format ); if ( false === $data ) { return false; } $where = $this->process_fields( $table, $where, $where_format ); if ( false === $where ) { return false; } $fields = $conditions = $values = array(); foreach ( $data as $field => $value ) { if ( is_null( $value['value'] ) ) { $fields[] = "`$field` = NULL"; continue; } $fields[] = "`$field` = " . $value['format']; $values[] = $value['value']; } foreach ( $where as $field => $value ) { if ( is_null( $value['value'] ) ) { $conditions[] = "`$field` IS NULL"; continue; } $conditions[] = "`$field` = " . $value['format']; $values[] = $value['value']; } $fields = implode( ', ', $fields ); $conditions = implode( ' AND ', $conditions ); $sql = "UPDATE `$table` SET $fields WHERE $conditions"; $this->check_current_query = false; return $this->query( $this->prepare( $sql, $values ) ); } /** * Delete a row in the table * * wpdb::delete( 'table', array( 'ID' => 1 ) ) * wpdb::delete( 'table', array( 'ID' => 1 ), array( '%d' ) ) * * @since 3.4.0 * @see wpdb::prepare() * @see wpdb::$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". * Sending a null value will create an IS NULL comparison - the corresponding format will be ignored in this case. * @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; } $where = $this->process_fields( $table, $where, $where_format ); if ( false === $where ) { return false; } $conditions = $values = array(); foreach ( $where as $field => $value ) { if ( is_null( $value['value'] ) ) { $conditions[] = "`$field` IS NULL"; continue; } $conditions[] = "`$field` = " . $value['format']; $values[] = $value['value']; } $conditions = implode( ' AND ', $conditions ); $sql = "DELETE FROM `$table` WHERE $conditions"; $this->check_current_query = false; return $this->query( $this->prepare( $sql, $values ) ); } /** * Processes arrays of field/value pairs and field formats. * * This is a helper method for wpdb's CRUD methods, which take field/value * pairs for inserts, updates, and where clauses. This method first pairs * each value with a format. Then it determines the charset of that field, * using that to determine if any invalid text would be stripped. If text is * stripped, then field processing is rejected and the query fails. * * @since 4.2.0 * * @param string $table Table name. * @param array $data Field/value pair. * @param mixed $format Format for each field. * @return array|false Returns an array of fields that contain paired values * and formats. Returns false for invalid values. */ protected function process_fields( $table, $data, $format ) { $data = $this->process_field_formats( $data, $format ); if ( false === $data ) { return false; } $data = $this->process_field_charsets( $data, $table ); if ( false === $data ) { return false; } $data = $this->process_field_lengths( $data, $table ); if ( false === $data ) { return false; } $converted_data = $this->strip_invalid_text( $data ); if ( $data !== $converted_data ) { return false; } return $data; } /** * Prepares arrays of value/format pairs as passed to wpdb CRUD methods. * * @since 4.2.0 * * @param array $data Array of fields to values. * @param mixed $format Formats to be mapped to the values in $data. * @return array Array, keyed by field names with values being an array * of 'value' and 'format' keys. */ protected function process_field_formats( $data, $format ) { $formats = $original_formats = (array) $format; foreach ( $data as $field => $value ) { $value = array( 'value' => $value, 'format' => '%s', ); if ( ! empty( $format ) ) { $value['format'] = array_shift( $formats ); if ( ! $value['format'] ) { $value['format'] = reset( $original_formats ); } } elseif ( isset( $this->field_types[ $field ] ) ) { $value['format'] = $this->field_types[ $field ]; } $data[ $field ] = $value; } return $data; } /** * Adds field charsets to field/value/format arrays generated by * the wpdb::process_field_formats() method. * * @since 4.2.0 * * @param array $data As it comes from the wpdb::process_field_formats() method. * @param string $table Table name. * @return array|false The same array as $data with additional 'charset' keys. */ protected function process_field_charsets( $data, $table ) { foreach ( $data as $field => $value ) { if ( '%d' === $value['format'] || '%f' === $value['format'] ) { /* * We can skip this field if we know it isn't a string. * This checks %d/%f versus ! %s because its sprintf() could take more. */ $value['charset'] = false; } else { $value['charset'] = $this->get_col_charset( $table, $field ); if ( is_wp_error( $value['charset'] ) ) { return false; } } $data[ $field ] = $value; } return $data; } /** * For string fields, record the maximum string length that field can safely save. * * @since 4.2.1 * * @param array $data As it comes from the wpdb::process_field_charsets() method. * @param string $table Table name. * @return array|false The same array as $data with additional 'length' keys, or false if * any of the values were too long for their corresponding field. */ protected function process_field_lengths( $data, $table ) { foreach ( $data as $field => $value ) { if ( '%d' === $value['format'] || '%f' === $value['format'] ) { /* * We can skip this field if we know it isn't a string. * This checks %d/%f versus ! %s because its sprintf() could take more. */ $value['length'] = false; } else { $value['length'] = $this->get_col_length( $table, $field ); if ( is_wp_error( $value['length'] ) ) { return false; } } $data[ $field ] = $value; } return $data; } /** * 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 ( $this->check_current_query && $this->check_safe_collation( $query ) ) { $this->check_current_query = false; } 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. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to * an stdClass object, an associative array, or a numeric array, respectively. Default OBJECT. * @param int $y Optional. Row to return. Indexed from 0. * @return array|object|null|void 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 ( $this->check_current_query && $this->check_safe_collation( $query ) ) { $this->check_current_query = false; } 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 ( $this->check_current_query && $this->check_safe_collation( $query ) ) { $this->check_current_query = false; } 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 array|object|null Database query results */ public function get_results( $query = null, $output = OBJECT ) { $this->func_call = "\$db->get_results(\"$query\", $output)"; if ( $this->check_current_query && $this->check_safe_collation( $query ) ) { $this->check_current_query = false; } 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; } /** * Retrieves the character set for the given table. * * @since 4.2.0 * * @param string $table Table name. * @return string|WP_Error Table character set, WP_Error object if it couldn't be found. */ protected function get_table_charset( $table ) { $tablekey = strtolower( $table ); /** * Filters the table charset value before the DB is checked. * * Passing a non-null value to the filter will effectively short-circuit * checking the DB for the charset, returning that value instead. * * @since 4.2.0 * * @param string $charset The character set to use. Default null. * @param string $table The name of the table being checked. */ $charset = apply_filters( 'pre_get_table_charset', null, $table ); if ( null !== $charset ) { return $charset; } if ( isset( $this->table_charset[ $tablekey ] ) ) { return $this->table_charset[ $tablekey ]; } $charsets = $columns = array(); $table_parts = explode( '.', $table ); $table = '`' . implode( '`.`', $table_parts ) . '`'; $results = $this->get_results( "SHOW FULL COLUMNS FROM $table" ); if ( ! $results ) { return new WP_Error( 'wpdb_get_table_charset_failure' ); } foreach ( $results as $column ) { $columns[ strtolower( $column->Field ) ] = $column; } $this->col_meta[ $tablekey ] = $columns; foreach ( $columns as $column ) { if ( ! empty( $column->Collation ) ) { list( $charset ) = explode( '_', $column->Collation ); // If the current connection can't support utf8mb4 characters, let's only send 3-byte utf8 characters. if ( 'utf8mb4' === $charset && ! $this->has_cap( 'utf8mb4' ) ) { $charset = 'utf8'; } $charsets[ strtolower( $charset ) ] = true; } list( $type ) = explode( '(', $column->Type ); // A binary/blob means the whole query gets treated like this. if ( in_array( strtoupper( $type ), array( 'BINARY', 'VARBINARY', 'TINYBLOB', 'MEDIUMBLOB', 'BLOB', 'LONGBLOB' ) ) ) { $this->table_charset[ $tablekey ] = 'binary'; return 'binary'; } } // utf8mb3 is an alias for utf8. if ( isset( $charsets['utf8mb3'] ) ) { $charsets['utf8'] = true; unset( $charsets['utf8mb3'] ); } // Check if we have more than one charset in play. $count = count( $charsets ); if ( 1 === $count ) { $charset = key( $charsets ); } elseif ( 0 === $count ) { // No charsets, assume this table can store whatever. $charset = false; } else { // More than one charset. Remove latin1 if present and recalculate. unset( $charsets['latin1'] ); $count = count( $charsets ); if ( 1 === $count ) { // Only one charset (besides latin1). $charset = key( $charsets ); } elseif ( 2 === $count && isset( $charsets['utf8'], $charsets['utf8mb4'] ) ) { // Two charsets, but they're utf8 and utf8mb4, use utf8. $charset = 'utf8'; } else { // Two mixed character sets. ascii. $charset = 'ascii'; } } $this->table_charset[ $tablekey ] = $charset; return $charset; } /** * Retrieves the character set for the given column. * * @since 4.2.0 * * @param string $table Table name. * @param string $column Column name. * @return string|false|WP_Error Column character set as a string. False if the column has no * character set. WP_Error object if there was an error. */ public function get_col_charset( $table, $column ) { $tablekey = strtolower( $table ); $columnkey = strtolower( $column ); /** * Filters the column charset value before the DB is checked. * * Passing a non-null value to the filter will short-circuit * checking the DB for the charset, returning that value instead. * * @since 4.2.0 * * @param string $charset The character set to use. Default null. * @param string $table The name of the table being checked. * @param string $column The name of the column being checked. */ $charset = apply_filters( 'pre_get_col_charset', null, $table, $column ); if ( null !== $charset ) { return $charset; } // Skip this entirely if this isn't a MySQL database. if ( empty( $this->is_mysql ) ) { return false; } if ( empty( $this->table_charset[ $tablekey ] ) ) { // This primes column information for us. $table_charset = $this->get_table_charset( $table ); if ( is_wp_error( $table_charset ) ) { return $table_charset; } } // If still no column information, return the table charset. if ( empty( $this->col_meta[ $tablekey ] ) ) { return $this->table_charset[ $tablekey ]; } // If this column doesn't exist, return the table charset. if ( empty( $this->col_meta[ $tablekey ][ $columnkey ] ) ) { return $this->table_charset[ $tablekey ]; } // Return false when it's not a string column. if ( empty( $this->col_meta[ $tablekey ][ $columnkey ]->Collation ) ) { return false; } list( $charset ) = explode( '_', $this->col_meta[ $tablekey ][ $columnkey ]->Collation ); return $charset; } /** * Retrieve the maximum string length allowed in a given column. * The length may either be specified as a byte length or a character length. * * @since 4.2.1 * * @param string $table Table name. * @param string $column Column name. * @return array|false|WP_Error array( 'length' => (int), 'type' => 'byte' | 'char' ) * false if the column has no length (for example, numeric column) * WP_Error object if there was an error. */ public function get_col_length( $table, $column ) { $tablekey = strtolower( $table ); $columnkey = strtolower( $column ); // Skip this entirely if this isn't a MySQL database. if ( empty( $this->is_mysql ) ) { return false; } if ( empty( $this->col_meta[ $tablekey ] ) ) { // This primes column information for us. $table_charset = $this->get_table_charset( $table ); if ( is_wp_error( $table_charset ) ) { return $table_charset; } } if ( empty( $this->col_meta[ $tablekey ][ $columnkey ] ) ) { return false; } $typeinfo = explode( '(', $this->col_meta[ $tablekey ][ $columnkey ]->Type ); $type = strtolower( $typeinfo[0] ); if ( ! empty( $typeinfo[1] ) ) { $length = trim( $typeinfo[1], ')' ); } else { $length = false; } switch( $type ) { case 'char': case 'varchar': return array( 'type' => 'char', 'length' => (int) $length, ); case 'binary': case 'varbinary': return array( 'type' => 'byte', 'length' => (int) $length, ); case 'tinyblob': case 'tinytext': return array( 'type' => 'byte', 'length' => 255, // 2^8 - 1 ); case 'blob': case 'text': return array( 'type' => 'byte', 'length' => 65535, // 2^16 - 1 ); case 'mediumblob': case 'mediumtext': return array( 'type' => 'byte', 'length' => 16777215, // 2^24 - 1 ); case 'longblob': case 'longtext': return array( 'type' => 'byte', 'length' => 4294967295, // 2^32 - 1 ); default: return false; } } /** * Check if a string is ASCII. * * The negative regex is faster for non-ASCII strings, as it allows * the search to finish as soon as it encounters a non-ASCII character. * * @since 4.2.0 * * @param string $string String to check. * @return bool True if ASCII, false if not. */ protected function check_ascii( $string ) { if ( function_exists( 'mb_check_encoding' ) ) { if ( mb_check_encoding( $string, 'ASCII' ) ) { return true; } } elseif ( ! preg_match( '/[^\x00-\x7F]/', $string ) ) { return true; } return false; } /** * Check if the query is accessing a collation considered safe on the current version of MySQL. * * @since 4.2.0 * * @param string $query The query to check. * @return bool True if the collation is safe, false if it isn't. */ protected function check_safe_collation( $query ) { if ( $this->checking_collation ) { return true; } // We don't need to check the collation for queries that don't read data. $query = ltrim( $query, "\r\n\t (" ); if ( preg_match( '/^(?:SHOW|DESCRIBE|DESC|EXPLAIN|CREATE)\s/i', $query ) ) { return true; } // All-ASCII queries don't need extra checking. if ( $this->check_ascii( $query ) ) { return true; } $table = $this->get_table_from_query( $query ); if ( ! $table ) { return false; } $this->checking_collation = true; $collation = $this->get_table_charset( $table ); $this->checking_collation = false; // Tables with no collation, or latin1 only, don't need extra checking. if ( false === $collation || 'latin1' === $collation ) { return true; } $table = strtolower( $table ); if ( empty( $this->col_meta[ $table ] ) ) { return false; } // If any of the columns don't have one of these collations, it needs more sanity checking. foreach ( $this->col_meta[ $table ] as $col ) { if ( empty( $col->Collation ) ) { continue; } if ( ! in_array( $col->Collation, array( 'utf8_general_ci', 'utf8_bin', 'utf8mb4_general_ci', 'utf8mb4_bin' ), true ) ) { return false; } } return true; } /** * Strips any invalid characters based on value/charset pairs. * * @since 4.2.0 * * @param array $data Array of value arrays. Each value array has the keys * 'value' and 'charset'. An optional 'ascii' key can be * set to false to avoid redundant ASCII checks. * @return array|WP_Error The $data parameter, with invalid characters removed from * each value. This works as a passthrough: any additional keys * such as 'field' are retained in each value array. If we cannot * remove invalid characters, a WP_Error object is returned. */ protected function strip_invalid_text( $data ) { $db_check_string = false; foreach ( $data as &$value ) { $charset = $value['charset']; if ( is_array( $value['length'] ) ) { $length = $value['length']['length']; $truncate_by_byte_length = 'byte' === $value['length']['type']; } else { $length = false; // Since we have no length, we'll never truncate. // Initialize the variable to false. true would take us // through an unnecessary (for this case) codepath below. $truncate_by_byte_length = false; } // There's no charset to work with. if ( false === $charset ) { continue; } // Column isn't a string. if ( ! is_string( $value['value'] ) ) { continue; } $needs_validation = true; if ( // latin1 can store any byte sequence 'latin1' === $charset || // ASCII is always OK. ( ! isset( $value['ascii'] ) && $this->check_ascii( $value['value'] ) ) ) { $truncate_by_byte_length = true; $needs_validation = false; } if ( $truncate_by_byte_length ) { mbstring_binary_safe_encoding(); if ( false !== $length && strlen( $value['value'] ) > $length ) { $value['value'] = substr( $value['value'], 0, $length ); } reset_mbstring_encoding(); if ( ! $needs_validation ) { continue; } } // utf8 can be handled by regex, which is a bunch faster than a DB lookup. if ( ( 'utf8' === $charset || 'utf8mb3' === $charset || 'utf8mb4' === $charset ) && function_exists( 'mb_strlen' ) ) { $regex = '/ ( (?: [\x00-\x7F] # single-byte sequences 0xxxxxxx | [\xC2-\xDF][\x80-\xBF] # double-byte sequences 110xxxxx 10xxxxxx | \xE0[\xA0-\xBF][\x80-\xBF] # triple-byte sequences 1110xxxx 10xxxxxx * 2 | [\xE1-\xEC][\x80-\xBF]{2} | \xED[\x80-\x9F][\x80-\xBF] | [\xEE-\xEF][\x80-\xBF]{2}'; if ( 'utf8mb4' === $charset ) { $regex .= ' | \xF0[\x90-\xBF][\x80-\xBF]{2} # four-byte sequences 11110xxx 10xxxxxx * 3 | [\xF1-\xF3][\x80-\xBF]{3} | \xF4[\x80-\x8F][\x80-\xBF]{2} '; } $regex .= '){1,40} # ...one or more times ) | . # anything else /x'; $value['value'] = preg_replace( $regex, '$1', $value['value'] ); if ( false !== $length && mb_strlen( $value['value'], 'UTF-8' ) > $length ) { $value['value'] = mb_substr( $value['value'], 0, $length, 'UTF-8' ); } continue; } // We couldn't use any local conversions, send it to the DB. $value['db'] = $db_check_string = true; } unset( $value ); // Remove by reference. if ( $db_check_string ) { $queries = array(); foreach ( $data as $col => $value ) { if ( ! empty( $value['db'] ) ) { // We're going to need to truncate by characters or bytes, depending on the length value we have. if ( 'byte' === $value['length']['type'] ) { // Using binary causes LEFT() to truncate by bytes. $charset = 'binary'; } else { $charset = $value['charset']; } if ( $this->charset ) { $connection_charset = $this->charset; } else { if ( $this->use_mysqli ) { $connection_charset = mysqli_character_set_name( $this->dbh ); } else { $connection_charset = mysql_client_encoding(); } } if ( is_array( $value['length'] ) ) { $length = sprintf( '%.0f', $value['length']['length'] ); $queries[ $col ] = $this->prepare( "CONVERT( LEFT( CONVERT( %s USING $charset ), $length ) USING $connection_charset )", $value['value'] ); } else if ( 'binary' !== $charset ) { // If we don't have a length, there's no need to convert binary - it will always return the same result. $queries[ $col ] = $this->prepare( "CONVERT( CONVERT( %s USING $charset ) USING $connection_charset )", $value['value'] ); } unset( $data[ $col ]['db'] ); } } $sql = array(); foreach ( $queries as $column => $query ) { if ( ! $query ) { continue; } $sql[] = $query . " AS x_$column"; } $this->check_current_query = false; $row = $this->get_row( "SELECT " . implode( ', ', $sql ), ARRAY_A ); if ( ! $row ) { return new WP_Error( 'wpdb_strip_invalid_text_failure' ); } foreach ( array_keys( $data ) as $column ) { if ( isset( $row["x_$column"] ) ) { $data[ $column ]['value'] = $row["x_$column"]; } } } return $data; } /** * Strips any invalid characters from the query. * * @since 4.2.0 * * @param string $query Query to convert. * @return string|WP_Error The converted query, or a WP_Error object if the conversion fails. */ protected function strip_invalid_text_from_query( $query ) { // We don't need to check the collation for queries that don't read data. $trimmed_query = ltrim( $query, "\r\n\t (" ); if ( preg_match( '/^(?:SHOW|DESCRIBE|DESC|EXPLAIN|CREATE)\s/i', $trimmed_query ) ) { return $query; } $table = $this->get_table_from_query( $query ); if ( $table ) { $charset = $this->get_table_charset( $table ); if ( is_wp_error( $charset ) ) { return $charset; } // We can't reliably strip text from tables containing binary/blob columns if ( 'binary' === $charset ) { return $query; } } else { $charset = $this->charset; } $data = array( 'value' => $query, 'charset' => $charset, 'ascii' => false, 'length' => false, ); $data = $this->strip_invalid_text( array( $data ) ); if ( is_wp_error( $data ) ) { return $data; } return $data[0]['value']; } /** * Strips any invalid characters from the string for a given table and column. * * @since 4.2.0 * * @param string $table Table name. * @param string $column Column name. * @param string $value The text to check. * @return string|WP_Error The converted string, or a WP_Error object if the conversion fails. */ public function strip_invalid_text_for_column( $table, $column, $value ) { if ( ! is_string( $value ) ) { return $value; } $charset = $this->get_col_charset( $table, $column ); if ( ! $charset ) { // Not a string column. return $value; } elseif ( is_wp_error( $charset ) ) { // Bail on real errors. return $charset; } $data = array( $column => array( 'value' => $value, 'charset' => $charset, 'length' => $this->get_col_length( $table, $column ), ) ); $data = $this->strip_invalid_text( $data ); if ( is_wp_error( $data ) ) { return $data; } return $data[ $column ]['value']; } /** * Find the first table name referenced in a query. * * @since 4.2.0 * * @param string $query The query to search. * @return string|false $table The table name found, or false if a table couldn't be found. */ protected function get_table_from_query( $query ) { // Remove characters that can legally trail the table name. $query = rtrim( $query, ';/-#' ); // Allow (select...) union [...] style queries. Use the first query's table name. $query = ltrim( $query, "\r\n\t (" ); // Strip everything between parentheses except nested selects. $query = preg_replace( '/\((?!\s*select)[^(]*?\)/is', '()', $query ); // Quickly match most common queries. if ( preg_match( '/^\s*(?:' . 'SELECT.*?\s+FROM' . '|INSERT(?:\s+LOW_PRIORITY|\s+DELAYED|\s+HIGH_PRIORITY)?(?:\s+IGNORE)?(?:\s+INTO)?' . '|REPLACE(?:\s+LOW_PRIORITY|\s+DELAYED)?(?:\s+INTO)?' . '|UPDATE(?:\s+LOW_PRIORITY)?(?:\s+IGNORE)?' . '|DELETE(?:\s+LOW_PRIORITY|\s+QUICK|\s+IGNORE)*(?:.+?FROM)?' . ')\s+((?:[0-9a-zA-Z$_.`-]|[\xC2-\xDF][\x80-\xBF])+)/is', $query, $maybe ) ) { return str_replace( '`', '', $maybe[1] ); } // SHOW TABLE STATUS and SHOW TABLES WHERE Name = 'wp_posts' if ( preg_match( '/^\s*SHOW\s+(?:TABLE\s+STATUS|(?:FULL\s+)?TABLES).+WHERE\s+Name\s*=\s*("|\')((?:[0-9a-zA-Z$_.-]|[\xC2-\xDF][\x80-\xBF])+)\\1/is', $query, $maybe ) ) { return $maybe[2]; } // SHOW TABLE STATUS LIKE and SHOW TABLES LIKE 'wp\_123\_%' // This quoted LIKE operand seldom holds a full table name. // It is usually a pattern for matching a prefix so we just // strip the trailing % and unescape the _ to get 'wp_123_' // which drop-ins can use for routing these SQL statements. if ( preg_match( '/^\s*SHOW\s+(?:TABLE\s+STATUS|(?:FULL\s+)?TABLES)\s+(?:WHERE\s+Name\s+)?LIKE\s*("|\')((?:[\\\\0-9a-zA-Z$_.-]|[\xC2-\xDF][\x80-\xBF])+)%?\\1/is', $query, $maybe ) ) { return str_replace( '\\_', '_', $maybe[2] ); } // Big pattern for the rest of the table-related queries. if ( preg_match( '/^\s*(?:' . '(?:EXPLAIN\s+(?:EXTENDED\s+)?)?SELECT.*?\s+FROM' . '|DESCRIBE|DESC|EXPLAIN|HANDLER' . '|(?:LOCK|UNLOCK)\s+TABLE(?:S)?' . '|(?:RENAME|OPTIMIZE|BACKUP|RESTORE|CHECK|CHECKSUM|ANALYZE|REPAIR).*\s+TABLE' . '|TRUNCATE(?:\s+TABLE)?' . '|CREATE(?:\s+TEMPORARY)?\s+TABLE(?:\s+IF\s+NOT\s+EXISTS)?' . '|ALTER(?:\s+IGNORE)?\s+TABLE' . '|DROP\s+TABLE(?:\s+IF\s+EXISTS)?' . '|CREATE(?:\s+\w+)?\s+INDEX.*\s+ON' . '|DROP\s+INDEX.*\s+ON' . '|LOAD\s+DATA.*INFILE.*INTO\s+TABLE' . '|(?:GRANT|REVOKE).*ON\s+TABLE' . '|SHOW\s+(?:.*FROM|.*TABLE)' . ')\s+\(*\s*((?:[0-9a-zA-Z$_.`-]|[\xC2-\xDF][\x80-\xBF])+)\s*\)*/is', $query, $maybe ) ) { return str_replace( '`', '', $maybe[1] ); } return false; } /** * Load the column metadata from the last query. * * @since 3.5.0 * */ protected function load_col_info() { if ( $this->col_info ) return; if ( $this->use_mysqli ) { $num_fields = mysqli_num_fields( $this->result ); for ( $i = 0; $i < $num_fields; $i++ ) { $this->col_info[ $i ] = mysqli_fetch_field( $this->result ); } } else { $num_fields = mysql_num_fields( $this->result ); for ( $i = 0; $i < $num_fields; $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 true */ 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', false ) ) { $this->error = new WP_Error($error_code, $message); } else { $this->error = $message; } return false; } wp_die($message); } /** * Closes the current database connection. * * @since 4.5.0 * * @return bool True if the connection was successfully closed, false if it wasn't, * or the connection doesn't exist. */ public function close() { if ( ! $this->dbh ) { return false; } if ( $this->use_mysqli ) { $closed = mysqli_close( $this->dbh ); } else { $closed = mysql_close( $this->dbh ); } if ( $closed ) { $this->dbh = null; $this->ready = false; $this->has_connected = false; } return $closed; } /** * Whether MySQL database is at least the required minimum version. * * @since 2.5.0 * * @global string $wp_version * @global string $required_mysql_version * * @return WP_Error|void */ 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(), $required_mysql_version, '<') ) { /* translators: 1: WordPress version number, 2: Minimum required MySQL version number */ return new WP_Error('database_version', sprintf( __( 'ERROR: WordPress %1$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. * * Use `wpdb::has_cap( 'collation' )`. * * @since 2.5.0 * @deprecated 3.5.0 Use wpdb::has_cap() * * @return bool True if collation is supported, false if version does not */ public function supports_collation() { _deprecated_function( __FUNCTION__, '3.5.0', '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 Added support for the 'utf8mb4' feature. * @since 4.6.0 Added support for the 'utf8mb4_520' feature. * * @see wpdb::db_version() * * @param string $db_cap The feature to check for. Accepts 'collation', * 'group_concat', 'subqueries', 'set_charset', * 'utf8mb4', or 'utf8mb4_520'. * @return int|false 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 if ( version_compare( $version, '5.5.3', '<' ) ) { return false; } if ( $this->use_mysqli ) { $client_version = mysqli_get_client_info(); } else { $client_version = mysql_get_client_info(); } /* * libmysql has supported utf8mb4 since 5.5.3, same as the MySQL server. * mysqlnd has supported utf8mb4 since 5.0.9. */ if ( false !== strpos( $client_version, 'mysqlnd' ) ) { $client_version = preg_replace( '/^\D+([\d.]+).*/', '$1', $client_version ); return version_compare( $client_version, '5.0.9', '>=' ); } else { return version_compare( $client_version, '5.5.3', '>=' ); } case 'utf8mb4_520' : // @since 4.6.0 return version_compare( $version, '5.6', '>=' ); } 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|array The name of the calling function */ public function get_caller() { return wp_debug_backtrace_summary( __CLASS__ ); } /** * Retrieves the MySQL server version. * * @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 ); } }