laravel 查询构造器

//查询构造器
public function query()
{
    $bool = DB::table('student')->insert([
        ['name' => '王五', 'age' => 17, 'gender' => 1],
        ['name' => '王五2', 'age' => 17, 'gender' => 1]
    ]);
    var_dump($bool);

    //获取插入的数据的id
    $student_id = DB::table('student')->insertGetId(
        ['name' => '赵六', 'age' => 19, 'gender' => 2]
    );
    var_dump($student_id);

    //更新数据,返回影响的行数
    $num = DB::table('student')->where('id',1)->update(
        ['age' => 20, 'gender' => 2]
    );
    var_dump($num);

    //更新数据，自增字段，返回影响的行数
    $num = DB::table('student')->where('id',1)->increment('age');//自增1
    $num = DB::table('student')->where('id',1)->increment('age',3);//自增3
    $num = DB::table('student')->where('id',1)->decrement('age',3);//自减3
    var_dump($num);

    //更新数据，自增以及其他字段修改
    $num = DB::table('student')->where('id',1)->increment('age',3,['name'=>'haha']);

    //删除数据，返回删除的行数
    $num = DB::table('student')->where('id',1)->delete();
    $num = DB::table('student')->where('id','>=',10)->delete();

    //清空数据，不返回任何东西
    $num = DB::table('student')->truncate();

}