@Transactional在Play 2.7中已弃用

Question

由于@Transactional在play 2.7中不建议使用，因此如何升级代码以使实体管理器成为Transactional。

Answer 1

您需要play documentation JPAApi.withTransaction：

public CompletionStage<Long> runningWithTransaction() {
    return CompletableFuture.supplyAsync(() -> {
        // lambda is an instance of Function<EntityManager, Long>
        return jpaApi.withTransaction(entityManager -> {
            Query query = entityManager.createNativeQuery("select max(age) from people");
            return (Long) query.getSingleResult();
        });
    }, executionContext);
}