Comments on: Flextrine Tutorial – CRUD in a simple Flex 4 address book: Creating new entities

By: Andrea Rodríguez

Andrea Rodríguez — Wed, 07 Sep 2011 23:02:56 +0000

You can do this:
var contactGroup:ContactGroup = new ContactGroup();
contactGroup.name =”New group”;
em.callRemoteMethod(“getServerTime”, contactGroup).ad..
And as I receive it in PHP?

By: devdave

devdave — Tue, 10 Aug 2010 13:17:01 +0000

Hey Arnaud,

You are very welcome, and thanks for your questions.

As you point out, in this particular application a failure on flush() does completely reload the database so any changes in Flextrine will indeed be lost. However, I was keeping things as simple as possible for the sake of the tutorial and Flextrine doesn’t put any demands on you to do things like this.

For example, for editing an existing entity you can use em.detach(entity) to get a copy of the entity you want to work on, and then use em.merge(entity); em.flush(); to save it. On an error you can then reload the particular entity without having to reload the whole repository. Alternatively you can can detach the original entity and store it somewhere in case of an error. Note that calling em.remove() on a persisted entity that has not successfully flushed will juse cancel the persist operation, so on a failed persist you can use remove to get the repository back to its correct state.

At present there is no support for concurrency – the record will just get overwritten by whoever flushes it last. However, support for optimistic locking will be definitely coming in later versions of Flextrine.

Cheers,

Dave

By: Arnaud

Arnaud — Tue, 10 Aug 2010 12:49:38 +0000

Hello,

Thank you for this huge work.
2 questions on the flush :
- in case on error, when you clear the Entity Manager, this means that all user changes are lost ? – or at least those which has been saved to database before the error occurs ?)
- what about concurrency ? what happens when 2 users are working on the same record (while updating or deleting one)?

Regards