laravel 增删修改

1.查  public function userTest(){
        return $this->all();
      }

public function userTest(){
        return $this->get(参数);
      }

2.增 public  function  usrAdd(){

   $this->user_name ='zhanfa';
   $this->password ='21';
   $this->save();
}

public  function  usrAdd(){
   $user_data = ['username' =>'user2', 'age' => '21'];
   $this->fill($user_data);
   $this->save();
}
3.更改

public  function  userUpdata(){
   $user_data =$this->where('user_id','2');
  $user_data->update('user_name' =>"zjang".'age'=>'21');
   
}
4.删

public  function  userdete(){
  $user = $this->find(参数);
  $user->delete();
   
}