thinkphp的增删改查

public function index()
    {
    //插入
      $res=Db::name("user")->insert([
          "id"=>"12",
           "name"=>"beijing",
           "number"=>1
       ]);
   //改
   $res=Db::name("user")->where("id",12)->update(["name"=>"thinkphp"]);
       //查
       $res=Db::name("user")->select();
//删除
       $res=Db::name("user")->where("id",12)->delete();
       return $res;
    }