/**
  * Returns current database driver
  *
  * @return string
  */
 protected function databaseDriver()
 {
     return $this->connection->getDriverName();
 }
 /**
  * Create a raw database expression.
  *
  * @param  mixed  $value
  * @return Illuminate\Database\Query\Expression
  */
 public function raw($value)
 {
     return $this->connection->raw($value);
 }