Java JpaRepository 上的 @Transactional
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@Transactional on a JpaRepository
提问by t0mmyw
I'm using a read only database to get some data in to my project. We use Spring v3 with jpa and hibernate
我正在使用只读数据库将一些数据输入到我的项目中。我们使用带有 jpa 和 hibernate 的 Spring v3
Will the following annotation have the effect of making all calls to my repository a read only transaction? Or do I need the annotation on the service layer calling the repository
以下注释是否会使对我的存储库的所有调用都成为只读事务？或者我需要在调用存储库的服务层上的注释
package com.blah.jpa;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.transaction.annotation.Transactional;
@Transactional(readOnly = true)
public interface ServiceToServerRepository extends JpaRepository<ServiceToServerJPA, String> {
}
So we get all the findOne, findAll for free. But any updates should fail as it is a read only transaction
所以我们免费获得了所有的 findOne 和 findAll。但是任何更新都应该失败，因为它是只读事务
采纳答案by Wojtek Owczarczyk
That should basically do it. But I usually opt for marking service-layer artifacts with Transactionalannotation. Anyway, please also check this post for more information of using transactionality together with Spring Data: How to use @Transactional with Spring Data?
基本上应该可以做到。但我通常选择使用Transactional注释标记服务层工件。无论如何，请同时查看此帖子以获取有关将事务性与 Spring Data 一起使用的更多信息：How to use @Transactional with Spring Data？
回答by Niels Bech Nielsen
The readOnly flag only hints that it is sufficient with a read only transaction while calling the method.
readOnly 标志仅提示在调用方法时使用只读事务就足够了。
If you have a nested transaction from your service layer which is not read only, then it would use that one, and you will effectively disregard this annotation.
如果您的服务层中有一个不是只读的嵌套事务，那么它将使用该事务，并且您将有效地忽略此注释。
