public static function createHashColumn($table, $columnName)
 {
     // Sanitize
     $table = Sanitize::variable($table);
     $columnName = Sanitize::variable($columnName);
     $prefix = Sanitize::word(substr($table, 0, 4) . ucfirst(substr($columnName, 0, 6)));
     // Make sure table exists
     if (Database::tableExists($table)) {
         $colExists = false;
         // Add the hash column if it doesn't exist
         if (!Database::columnExists($table, $columnName)) {
             $colExists = Database::addColumn($table, $columnName . '_crc', "int(10) unsigned not null", 0);
         }
         if ($colExists) {
             // Create a Trigger
             self::exec('CREATE TRIGGER ' . $prefix . '_ins BEFORE INSERT ON ' . $table . ' FOR EACH ROW BEGIN SET NEW.' . $columnName . '_crc=crc32(NEW.' . $columnName . '); END;');
             return self::exec('CREATE TRIGGER ' . $prefix . '_upd BEFORE UPDATE ON ' . $table . ' FOR EACH ROW BEGIN SET NEW.' . $columnName . '_crc=crc32(NEW.' . $columnName . '); END; ');
         }
     }
     return false;
 }