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:
$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);
Yii使用findAll返回数据时对象,需要循环可以直接按照数据形式进行遍历。例如你返回的结果变量为$result,那么遍历的时就可以直接这么写:
foreach($result as $k =>$v)
{
echo '姓名:'.$v['name'];
}
我经常这么用,Yii还提供一种查询方式,代码如下:
Yii::app()->db->createCommand('SELECT * FROM user)->queryAll();