JOIN과 함께 CakePHP의 find 메소드를 사용하여 여러 테이블에서 데이터를 검색하는 방법은 무엇입니까?

Retrieve Data from Multiple Tables Using CakePHP's find Method with JOIN

To execute the specified SQL query using CakePHP's find method, you can employ two approaches:

Method 1: CakePHP Standard Approach

1. Establish relationships between your models:

<code class="php">class User extends AppModel {
    public $actsAs = array('Containable');
    public $hasMany = array('Message');
}

class Message extends AppModel {
    public $actsAs = array('Containable');
    public $belongsTo = array('User');
}</code>

2. Define relationships properly:
3. Rename messages.from column to messages.user_id for auto-association.
4. Execute the query:

<code class="php">$this->Message->find('all', array(
    'contain' =&gt; array('User')
    'conditions' =&gt; array(
        'Message.to' =&gt; 4
    ),
    'order' =&gt; 'Message.datetime DESC'
));</code>

Method 2: Custom Join

1. Define custom join parameters:

<code class="php">$this->Message->find('all', array(
    'joins' =&gt; array(
        array(
            'table' =&gt; 'users',
            'alias' =&gt; 'UserJoin',
            'type' =&gt; 'INNER',
            'conditions' =&gt; array(
                'UserJoin.id = Message.from'
            )
        )
    ),
    'conditions' =&gt; array(
        'Message.to' =&gt; 4
    ),
    'fields' =&gt; array('UserJoin.*', 'Message.*'),
    'order' =&gt; 'Message.datetime DESC'
));</code>

Using Multiple Relationships to the Same Model

You can establish two relationships to the same model:

<code class="php">class User extends AppModel {
    public $actsAs = array('Containable');
    public $hasMany = array(
        'MessagesSent' =&gt; array(
            'className'  =&gt; 'Message',
            'foreignKey' =&gt; 'from'
         )
    );
    public $belongsTo = array(
        'MessagesReceived' =&gt; array(
            'className'  =&gt; 'Message',
            'foreignKey' =&gt; 'to'
         )
    );
}

class Message extends AppModel {
    public $actsAs = array('Containable');
    public $belongsTo = array(
        'UserFrom' =&gt; array(
            'className'  =&gt; 'User',
            'foreignKey' =&gt; 'from'
        )
    );
    public $hasMany = array(
        'UserTo' =&gt; array(
            'className'  =&gt; 'User',
            'foreignKey' =&gt; 'to'
        )
    );
}</code>

Example query:

<code class="php">$this->Message->find('all', array(
    'contain' =&gt; array('UserFrom')
    'conditions' =&gt; array(
        'Message.to' =&gt; 4
    ),
    'order' =&gt; 'Message.datetime DESC'
));</code>

위 내용은 JOIN과 함께 CakePHP의 find 메소드를 사용하여 여러 테이블에서 데이터를 검색하는 방법은 무엇입니까?의 상세 내용입니다. 자세한 내용은 PHP 중국어 웹사이트의 기타 관련 기사를 참조하세요!