众所周知
modelName::model() -> find() //找出的是一个对象
modelName::model() -> findALL() //找出的是一个对象集合的数组
如何找出我所需要的字段的数据,而不是全部字段的数据
之前我是这么做的
$criteria = new CDbCriteria; $criteria->select = "username,id,email"; $criteria->order = "id DESC"; $users = modelName::model()->findAll( $criteria );
后台无意中看到别人有这么写的,发现自己是多么的无知
$users = modelName::model()->findAll(array( "select" =>array("username","id","email"), "order" => "id DESC", ));
测试后发现果然可以用,那么find也可以这么操作
$user = modelName::model()->find(array( "select" =>array("username","id","email"), "order" => "id DESC", "condition" => "id=".$id, ));
当然了,这么做肯定不安全了,换成下面的方法同样可以
$users = $this->user->find(array( "select"=>array("id","username","email"), "order" => "id DESC", "condition" => "state=:state AND id=:id", "params" => array(":state"=>"1",":id" => "2"), ));
同理用findAll测试了也可以,结论
通过这种方法能够很方便的获取所需要的数据,当然需要分页的时候还是 需要 new 以下 CDbCriteria 的
比如我要取出videoinfo表中的"v_id","title","big_class","sub_class","upload_time","comment_num" 等字段,且条件是status=1的,按照lastmodifytime倒序,且只取出3条即可,这样操作:
$criteria = new CDbCriteria() ; $criteria -> select = array("v_id","title","big_class","sub_class","upload_time","comment_num"); $criteria -> condition = "status = 1"; $criteria -> order = "lastmodifytime desc"; $criteria -> limit = 3; $criteria ->params = array (":status" => $你的变量) ; $result = VideoInfo::model()->findAll($criteria);
其中我注释掉的那一行是可以传变量的,用占位符表示,比如你的status需要按照变量来条件赋值的话,可以在注释的那行赋值,然后在condition条件写成
$criteria -> condition = "status = :status";
即可,
这样,$result变量时你取得的结果,它是个对象列表,需要遍历一下:
foreach ($result as $ob){ print_r($ob->attributes); }
比如你想展示每个字段只需打出
$ob->attributes["title"];
等等即可
领完,CPagination类可以和CDbCriteria类以及前台的分页插件一起用来支持分页:
$count =VideoInfo::model()->count($criteria) $pages=new CPagination($count); $pages->pageSize=30; //每页分多少条 $pages->applyLimit($criteria);
$result = VideoInfo::model()->findAll($criteria);