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JOIN? ??? CakePHP ?? ???
? ??? ??? MySQL ???? CakePHP? `find` ????? JOIN ??? ???? ??? ??????

CakePHP? `find` ????? JOIN ??? ???? ??? ??????

Jan 04, 2025 pm 01:47 PM

How to Perform JOIN Queries in CakePHP's `find` Method?

JOIN? ??? CakePHP ?? ???

CakePHP?? ?? ???? ??? ?????? ??? ?????. JOIN ??? ????? ??? ?? ??? ????? ??? ?? ??? ??? ? ????.

??(??)

??? ????? ??? ???? ???. ?? ?? ??. ?? ?? ??? ??? ??? ??? ?? ?? ???? ??? ?????.

class User extends AppModel {
    public $hasMany = ['Message'];
}

class Message extends AppModel {
    public $belongsTo = ['User'];
}

??? ??? ???? ??? ??? ???? JOIN ??? ??? ? ????. ??? ??:

$messages = $this->Message->find('all', [
    'contain' => ['User'],
    'conditions' => ['Message.to' => 4],
    'order' => 'Message.datetime DESC'
]);

??? ?? ??

??? ??? ???? ?? ??? ?? find ??? ???? ?? ??? ??? ? ????.

$messages = $this->Message->find('all', [
    'joins' => [
        [
            'table' => 'users',
            'alias' => 'UserJoin',
            'type' => 'INNER',
            'conditions' => ['UserJoin.id = Message.from']
        ]
    ],
    'conditions' => ['Message.to' => 4],
    'fields' => ['UserJoin.*', 'Message.*'],
    'order' => 'Message.datetime DESC'
]);

??? ??? ????? ??? ??? ?? ??? ??? ? ?? ??? ????? ???? ???.

?? ??? ?? ?? ??

? ?? ?? ??? ??? ??? ?? ??? ??? ????. ??? ??? ??. ?? ??, ???? ?? ??? ???? ?? MessageSent ??? ?? ?? ???? ?? MessageReceived ??? ?? ? ????.

class User extends AppModel {
    public $hasMany = [
        'MessagesSent' => ['className' => 'Message', 'foreignKey' => 'from'],
        'MessagesReceived' => ['className' => 'Message', 'foreignKey' => 'to']
    ];
}

class Message extends AppModel {
    public $belongsTo = [
        'UserFrom' => ['className' => 'User', 'foreignKey' => 'from'],
        'UserTo' => ['className' => 'User', 'foreignKey' => 'to']
    ];
}

??? ??? ???? ??? ?? JOIN ??? ??? ? ????.

$messages = $this->Message->find('all', [
    'contain' => ['UserFrom'],
    'conditions' => ['Message.to' => 4],
    'order' => 'Message.datetime DESC'
]);

? ??? CakePHP? `find` ????? JOIN ??? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!

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