How to write UNION in Doctrine 2.0

Question

How to write this SQL query in Doctrine 2.0 (and fetch results)?

(SELECT \'group\' AS type, 
    CONCAT(u.firstname, \" \", u.surname) as fullname, 
    g.na         


        

Answer 1

$connection = $em->getConnection();
$query = $connection->prepare("SELECT field1, field2 FROM table1 
                                UNION
                                SELECT field3, field4 FROM table2 
                                UNION 
                                SELECT field5, field6 FROM table3
                                ");
$query->execute();
$result = $query->fetchAll();