Doctrine\DBAL\Connection::getExpressionBuilder PHP Method

    public function getExpressionBuilder()
    {
        return $this->_expr;
    }

 /**
  * Construtor
  *
  * @param Connection $connection
  * @param array $rootAliases
  * @param array $fieldMap
  */
 public function __construct(Connection $connection, array $rootAliases, array $fieldMap = array())
 {
     $this->rootAliases = $rootAliases;
     $this->fieldMap = $fieldMap;
     $this->conn = $connection;
     $this->expr = $this->conn->getExpressionBuilder();
 }