子查询 ActiveRecord Yii

Sub-queries ActiveRecord Yii(子查询 ActiveRecord Yii)

问题描述

Yii 中的 ActiveRecord 是否可以进行子查询?

Is it possible to make sub-queries in ActiveRecord in Yii?

我有一个这样的查询:

select * from table1where table1.field1 in (select table2.field2 from table2)

我目前正在使用空闲代码:

i'm currently using the fallowing code:

object1::model()->findAll(array('condition'=>'t.field1 in (select table2.field2 from table2)'))

我想知道是否有一种方法可以在不使用 SQL 和不使用连接的情况下构造子查询.

i would like to know if there is a manner to construct the sub-query without using SQL, and without using joins.

有什么解决办法吗?

提前致谢.

推荐答案

首先通过 db 字段查找 doublets:

First find doublets by db fields:

$model=new MyModel('search');
$model->unsetAttributes();

$criteria=new CDbCriteria();
$criteria->select='col1,col2,col3';
$criteria->group = 'col1,col2,col3';
$criteria->having = 'COUNT(col1) > 1 AND COUNT(col2) > 1 AND COUNT(col3) > 1';

获取子查询:

$subQuery=$model->getCommandBuilder()->createFindCommand($model->getTableSchema(),$criteria)->getText();

添加子查询条件:

$mainCriteria=new CDbCriteria();
$mainCriteria->condition=' (col1,col2,col3) in ('.$subQuery.') ';
$mainCriteria->order = 'col1,col2,col3';

使用方法:

$result = MyModel::model()->findAll($mainCriteria);

或者:

$dataProvider = new CActiveDataProvider('MyModel', array(
        'criteria'=>$mainCriteria,
));

来源:http://www.yiiframework.com/wiki/364/using-sub-query-for-doubletts/

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