Laravel lockforupdate (Pessimistic Locking)

Question

i\'m trying to figure out how to use/test the lockforupdate correctly, but i found is not function like what i expected

this is just testing

public f         


        

Answer 1

Read This Article Reference

Pessimistic vs Optimistic Locking in Laravel

• SharedLock:

  DB::table('users')->where('votes', '>', 100)->sharedLock()->get();
  

• LockForUpdate:

  DB::table('users')->where('votes', '>', 100)->lockForUpdate()->get();
  

Laravel Docs

Answer 2

This work, finally, but still don't understand what sharedLock(LOCK IN SHARE MODE) and lockForUpdate(FOR UPDATE) different

    public function index() {
        return dd(\DB::transaction(function() {
            if (\Auth::guard('user')->check()) {
                $model = \App\Models\User::lockForUpdate()->find(1);
                sleep(30);
                $model->point = 100000;
                $model->save();
            } else {
                $model = \App\Models\User::lockForUpdate()->find(1);
                $model->point = $model->point + 1;
                $model->save();
            }

            return $model;
        }));
    }