How to use union in zend db

Question

In sql i am using union i don\'t know how to write it in zend db.

select m.*, 0 as is_shared from test m where user_id = $userId 
union
select m.*,1 as is_sh         


        

Answer 1

For future reference, in Zend Framework 2.3 this is done with combine.

For example:

    use \Zend\Db\Sql\Select;
    use \Zend\Db\Sql\Sql;

    $sql = new Sql(/* ADAPTER HERE */);

    $tag1 = new Select( ['a' => 'articles'] );
    $tag1->columns( [ 'tag' => 'first_tag'] );
    $tag1->where->in('a.id', $articleIds);

    $tag2 = new Select( ['a' => 'articles'] );
    $tag2->columns( [ 'tag' => 'second_tag'] );
    $tag2->where->in('a.id', $articleIds);
    $tag2->combine($tag1);

    $tag3 = new Select( ['a' => 'articles'] );
    $tag3->columns( [ 'tag' => 'third_tag'] );
    $tag3->where->in('a.id', $articleIds);
    $tag3->combine($tag2);

    $statement = $sql->prepareStatementForSqlObject($tag3);