laravel中的DB facade实现数据的CURD

/*　　　　$students=DB::select("select * from student");
        var_dump($students);*/

        //新增数据：
        /*$bool=DB::insert('insert into student(name,age) values(?,?)',['imooc',18]);
        var_dump($bool);*/

        //更新数据：
        /*$num = DB::update('update student set age=? where name=?', [20, 'sean']);
        var_dump($num);*/

        //查询数据：
        /*$students=DB::select("select * from student where id>?",[1001]);
        dd($students);*/

        //删除数据：
        $num = DB::delete('delete from student where id>?', [1001]);
        var_dump($num);