CODEWITHSUNDEEP
phpsqlmysqlcakephpunion
bancer
bancer

Reputation: 7525

UNION syntax in Cakephp

Anyone knows a good way to make UNION query in CakePHP? I would like to avoid using $this->query();.

With two tables t1, t2:

SELECT * FROM t1
LEFT JOIN t2 ON t1.id = t2.id
UNION
SELECT * FROM t1
RIGHT JOIN t2 ON t1.id = t2.id

With three tables t1, t2, t3:

SELECT * FROM t1
LEFT JOIN t2 ON t1.id = t2.id
LEFT JOIN t3 ON t2.id = t3.id
UNION
SELECT * FROM t1
RIGHT JOIN t2 ON t1.id = t2.id
LEFT JOIN t3 ON t2.id = t3.id
UNION
SELECT * FROM t1
RIGHT JOIN t2 ON t1.id = t2.id
RIGHT JOIN t3 ON t2.id = t3.id

Upvotes: 13

Views: 18149

Answers (4)

afsane
afsane

Reputation: 1919

use a code like this :

$friendsPosts= $this->Posts->find('all')
                ->contain(['Users', 'Languages', 'PostStates'])
                ->innerJoinWith('Users.Dusers', function ($q) {
                    return $q->where(['Dusers.id' => $this->Auth->user('id')]);
                });

        $posts= $this->Posts->find('all')
                ->where(['Posts.post_state_id' => 3])
                ->contain(['Users', 'Languages', 'PostStates']);

    $posts->union($friendsPosts);

Upvotes: 1

Mathieu de Lorimier
Mathieu de Lorimier

Reputation: 1015

A simple way to do this, which we currently use, is to create a view in MySQL or whatever database you use. Then, instead of using a table in your model, you use your view. You can read about view creation syntax here: http://dev.mysql.com/doc/refman/5.6/en/create-view.html. You could also use software like HeidiSQL to help you with view creation.

You would then have something like this in your model : 

class Contenu extends AppModel {
    public $useTable = 'v_contenu';

This allows you to still use the find() method in CakePHP, which is really nice to have.

To get the best performance with views you should update MySQL to at least version 5.6.

Upvotes: 5

Chuck Burgess
Chuck Burgess

Reputation: 11574

Too many coders try to limit themselves to the functionality of a framework. DON'T. Use what the framework provides. If it does not have the functionality you seek, then either:

  • Code the functionality you need into a class extension

or

  • Custom spin the code within the framework to suit your needs.

Often, developers try to hammer a square peg into a round hole and wind up doing way too much extra work that really only makes the code complicated. Take a step back and ask why you are using the framework to begin with. It brings structure to an unstructured language. It provides solid reusable foundation to build your application on. It is not intended to be a box to put yourself in and be limited.

UPDATE: I took a minute to read Complex Find Conditions and found your answer:

$joins = array(
    array(
        'table' => 'test_twos',
        'alias' => 'TestTwo',
        'type' => 'LEFT',
        'conditions' => array(
            'TestTwo.id = TestOne.id',
        )
    ),
    array(
        'table' => 'test_threes',
        'alias' => 'TestThree',
        'type' => 'LEFT',
        'conditions' => array(
        'TestThree.id = TestOne.id',
    )
    )
);

$dbo = $this->getDataSource();
$subQuery = $dbo->buildStatement(
    array(
        'fields' => array('*'),
        'table' => $dbo->fullTableName($this),
        'alias' => 'TestOne',
        'limit' => null,
        'offset' => null,
        'joins' => $joins,
        'conditions' => null,
        'order' => null,
        'group' => null
    ),
    $this->TestOne
);
$query = $subQuery;

$query .= ' UNION ';
$joins = array(
    array(
        'table' => 'test_twos',
        'alias' => 'TestTwo',
        'type' => 'LEFT',
        'conditions' => array(
            'TestTwo.id = TestOne.id',
        )
    ),
    array(
        'table' => 'test_threes',
        'alias' => 'TestThree',
        'type' => 'RIGHT',
        'conditions' => array(
        'TestThree.id = TestOne.id',
        )
    )
);

$dbo = $this->getDataSource();
$subQuery = $dbo->buildStatement(
    array(
    'fields' => array('*'),
    'table' => $dbo->fullTableName($this),
    'alias' => 'TestOne',
    'limit' => null,
    'offset' => null,
    'joins' => $joins,
    'conditions' => null,
    'order' => null,
    'group' => null
    ),
    $this->TestOne
);

$query .= $subQuery;

pr($query);

Upvotes: 13

Bohemian
Bohemian

Reputation: 425073

Use a view, then select from that:

create view my_union as
SELECT * FROM t1
LEFT JOIN t2 ON t1.id = t2.id
LEFT JOIN t3 ON t2.id = t3.id
UNION
SELECT * FROM t1
RIGHT JOIN t2 ON t1.id = t2.id
LEFT JOIN t3 ON t2.id = t3.id
UNION
SELECT * FROM t1
RIGHT JOIN t2 ON t1.id = t2.id
RIGHT JOIN t3 ON t2.id = t3.id

In your code:

select * from my_union

Upvotes: 3

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