yii框架的简单curd

class HelloController extends Controller
{

public $enableCsrfValidation = false; //禁用csrf拦截 禁止提交重复表单

/**
* 添加
*
* @author YING
* @param void
* @return void
*/
public function actionAdd(){

$request=\Yii::$app->request; //实例化请求类

if($request->isPost){
$data=$request->post(); //接值
$res=\Yii::$app->db->createCommand()->insert('user',$data)->execute(); //执行
if($res){
$this->redirect(['hello/list']);
}else{
echo "添加失败";
}

}else{

return $this->renderPartial('register.html');

}
}

/**
* 查询
*
* @author YING
* @param void
* @return void
*/
public function actionList(){
//查询
$db=\Yii::$app->db;
$userInfo=$db->createCommand('select * from `user`')->queryAll();//执行
return $this->render('list',['userInfo'=>$userInfo]); //赋值

}

/**
* 删除
*
* @author YING
* @param id
* @return void
*/
public function actionDelete(){
$request=\Yii::$app->request; //定义类
$id=$request->get('id'); //接值
$db=\Yii::$app->db;
$res=$db->createCommand()->delete('user',"id=$id")->execute(); //执行

//判断
if($res){
$this->redirect(['hello/list']);
}else{
echo  "删除失败";
}

}

/**
* 修改
*
* @author YING
* @param void
* @return void
*/
public function  actionUpdate(){

$request=\Yii::$app->request; //请求方式

if($request->isPost){

//接值
$username=$request->post('username');
$password=$request->post('password');
$id=$request->post('id');

$result=\Yii::$app->db->createCommand()->update('user',['username'=>$username,'password'=>$password],'id=:id',[':id'=>$id])->execute();

//判断
if($result){
$this->redirect(['hello/list']);
}else{
echo "修改失败";
}

}else{

$id=$request->get('id'); //接值
$sql="select * from `user` where id='$id'"; //sql语句

$userInfo=\Yii::$app->db->createCommand($sql)->queryAll(); //执行
return $this->render('update',['userInfo'=>$userInfo[0]]); //加载视图层

}

}

}