问题

I am trying to do a Join query using CDBCriteria in Yii framework. The issue is the join query works successfully but it does not display the columns from other tables.

I am doing in the following way

$criteria = new CDbCriteria;

$criteria->order = 't.id desc';

$criteria->select = '*';

$criteria->join = ' INNER JOIN table2 INNER JOIN table3 INNER JOIN table4';

When i run this, I can see only the mail table1 columns displayed. Other columns are not shown.

In my model class, I have the relation has

public function relations()
{
  // NOTE: you may need to adjust the relation name and the related
  // class name for the relations automatically generated below.
    return array(
      'user' => array(self::BELONGS_TO, 'DmPhoneUser', 'user_id'),
      'command' => array(self::BELONGS_TO, 'DmOtaCommand', 'command_id'),
      'partner' => array(self::BELONGS_TO, 'DmPartner', 'partner_id'),
    );
}

********************************************************

public function actionGetHistory($start, $per_page)
{
    $partner_id = '10';
    $criteria = new CDbCriteria;
    $criteria->order = 't.history_id desc';
    $criteria->select = 't.*, table2.*';
    $criteria->join = ' INNER JOIN table2 ON t.command_id = table2.command_id';
    $result = Table_1_class::model()->with('command')->findAll();
    $history_data = CJSON::encode($result);
    echo $history_data;
}

here command_id is common in table1 and table2.

This is how I am using the criteria code.

回答1:

As I said, Yii's Active Record implementation will only use columns which are defined in the table itself or the tables you are linking to through with, not arbitrary columns you return in the resultset.

Solution 1: Define a relation to table2, add that relation to with, and get rid of join. Then you'll probably need to convert each returned object to an array - CJSON::encode will not handle a model with relations well.

Solution 2: Use Yii::app()->db->createCommand("SQL query")->queryAll(); instead of Active Record. This will produce an array of arrays, which CJSON::encode will have no problem with.

来源：https://stackoverflow.com/questions/10316652/doing-join-query-using-cdbcriteria

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