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Homephp教程php手册Yii CDbCriteria

注:$c = new CDbCriteria();是ActiveRecord的一种写法,使ActiveRecord更加灵活,而不是手册中DAO(PDO)和Query Builder。 

这是Yii CDbCriteria的一些笔记和常用用法: 

一、一个sql拼装的情况

    $criteria = new CDbCriteria;           

    $criteria->addCondition("id=1"); //查询条件,即where id = 1     

    $criteria->addInCondition('id'array(1,2,3,4,5)); //代表where id IN (1,23,,4,5,);     

    $criteria->addNotInCondition('id'array(1,2,3,4,5));//与上面正好相法,是NOT IN     

    $criteria->addCondition('id=1','OR');//这是OR条件,多个条件的时候,该条件是OR而非AND     

    $criteria->addSearchCondition('name''分类');//搜索条件,其实代表了。。where name like '%分类%'     

    $criteria->addBetweenCondition('id', 1, 4);//between 1 and 4      

         

    $criteria->compare('id', 1);    //这个方法比较特殊,他会根据你的参数自动处理成addCondition或者addInCondition,     

                                    //即如果第二个参数是数组就会调用addInCondition     

        

    $criteria->addCondition("id = :id");     

    $criteria->params[':id']=1;     

      

//属性方式     

    $criteria->select = 'id,parentid,name'//代表了要查询的字段,默认select='*';     

    $criteria->join = 'xxx'//连接表     

    $criteria->with = 'xxx'//调用relations      

    $criteria->limit = 10;    //取1条数据,如果小于0,则不作处理     

    $criteria->offset = 1;   //两条合并起来,则表示 limit 10 offset 1,或者代表了。limit 1,10     

    $criteria->order = 'xxx DESC,XXX ASC' ;//排序条件     

    $criteria->group = 'group 条件';     

    $criteria->having = 'having 条件 ';     

    $criteria->distinct = FALSE; //是否唯一查询    




实例: 

Php代码  

$criteria = new CDbCriteria();   

$criteria->select = 'table_name,model_id,sum(amount) total';   

$criteria->group = 'table_name,model_id';   

$criteria->addCondition("$nIdcId=4");//也可以$criteria->condition = "$nIdcId=4";   

$aResult = accessory_info::model()->findAll($criteria);   

  

  

$c = new CDbCriteria();   

$c->select = 't.id, t.created_at, t.outsource_id, t.user_id, t.operate, t.content';   

$c->join = 'LEFT JOIN outsource ON outsource.id=t.outsource_id';   

$c->condition = 'outsource.idc_id IN(' . implode(','$idc_ids)  . ')';   

  

if($last_log_id) {   

    $c->condition .= " AND t.id > $last_log_id";   

}   

  

$c->limit = 20;   

$c->order = 't.id DESC';   

  

$logs = OutsourceProcessLog::model()->findAll($c);  



批注: 
1,与DAO方式结果区别是:DAO方式  数组中的每一个元素仍是数组。而通过CDbCriteria方式,数组中的元素是对象。 
2,即使该功能很强大,仍有一些需求不能满足,此时仍需sql语句。比如select avg(num) amount from ****。 


二、mergeWith的情况

//在ActiveRecord中,增加条件限制   

$this->getDbCriteria()->mergeWith(array(   

    'condition'=>"idc_id IN ($ids)",   

)); 

 

原文转自百度空间《Yii CDbCriteria 常用方法》

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