table_name()} ( `id` INT(11) NOT NULL, `cache` LONGTEXT, `stage` INT(11) NOT NULL DEFAULT 0, `maintenance` bit DEFAULT 0, PRIMARY KEY ( id ) ) {$this->charset_collate( true )};"; dbDelta( $query ); } /** * Function to define our maintenance column. * * @since 3.4.0 */ public function cache_collate_fields() { // If the maintenance column has not already been defined... if ( ! $this->column_exists( 'maintenance' ) ) { global $wpdb; // Modify our table. $query = "ALTER TABLE {$this->table_name()} ADD `maintenance` bit DEFAULT 0;"; $wpdb->query( $query ); } } }