嵌套的Sql查询函数影响PHP事务吗？

Question

我要编写一个较长的sql事务，并考虑编写可重用的sql函数，所以我的问题是我可以这种方式编写事务吗？

try {
    // First of all, let's begin a transaction
    $db->beginTransaction();

    // A set of queries; if one fails, an exception should be thrown
    $db->query('first query');
    UpdateEmp();
      //anothre sql query function, i put him in another function so that i 
      //can use it seperately

    $db->query('second query');

    UpdateProject();

    $db->query('third query');


    // If we arrive here, it means that no exception was thrown
    // i.e. no query has failed, and we can commit the transaction
    $db->commit();
} catch (Exception $e) {
    // An exception has been thrown
    // We must rollback the transaction
    $db->rollback();
}

其他sql函数就像

  function UpdateEmp(){
     //separate sql queries for emplyee update
        UpdateEmpProject();//nested sql query function
    //Do any db error will stop and rollback the trasaction?
    }

function UpdateEmpProject(){

    //sepeate sql queries for emplyee update

    }

我的问题是，如果UpdateEmp函数中发生任何错误，事务是否会回滚？假设UpdateEmp（）还包含另一个带有sql查询的函数，那么嵌套查询也会影响事务结果吗？