Support transactions

[Omar BELKHODJA]

In some frameworks, like Spring/Java, it is possible to specify that all the database operations are executed in the same transaction, simply by adding the @transactional annotation to any method.

I would be interesting to have this feature in Angel also.

[Tobe Osakwe]

As it is right now, QueryExecutor already has a transaction method. In addition, relations are performed through joins, and therefore are all fetched with just one query.

await executor.transaction((tx) async {
  await query1.getOne(tx);
  await query2.delete(tx);
});

I am hesitant to add new annotations, because they tend to bring "magic," all while making things more complex, harder to maintain, and harder to debug. This was one thing I really disliked about Spring - annotation soup, and a lack of clear flow.

[Tobe Osakwe]

I'm going to close this, as transactions are already supported. Do let me know, though, if this is inadequate, and we can reopen this and make changes.

[Kevin Elliott]

@thosakwe Why is there no documentation on using transaction?

[Tobe Osakwe]

It can be found in the dartdocs, and is visible on the QueryExecutor interface.

Should it be in the README?