在带有 jpa/hibernate 的 Spring 中，如何保持会话打开以避免延迟初始化异常? [英] In Spring with jpa/hibernate, how do I keep a session open to avoid lazy initialization exceptions?

问题描述

我目前将实体 bean 中的集合标记为渴望避免在使用 EntityManager 加载 bean 后尝试访问集合属性时出现延迟初始化异常.

I currently mark collections in entity beans as eager to avoid getting a lazy initialization exception when I try to access the collection properties after loading the bean with the EntityManager.

如果我将集合保留为延迟加载，我如何保持会话打开?我想尝试使用@Transactional，但即使有效，我也不想这样做，因为在很长的方法中打开事务似乎是不正确的.

If I instead leave the collection as lazy loading, how do I keep a session open? I thought about trying @Transactional, but even if that worked I wouldn't want to do it because it doesn't seem right to leave a transaction open over a long method.

推荐答案

https://www.hibernate.org/43.html

基本上，您有几个选择.

Basically, you have a few options.

-您可以使用在视图中打开会话"模式，其中使用过滤器/拦截器/AOP 样式逻辑在服务器端逻辑开始时打开会话，并在会话结束时关闭它.

-You can use the "open session in view" pattern where you use a filter/interceptor/AOP - style logic to open a session when server side logic begins, and close it when it's through.

-您可以实现跨越多个请求-响应周期的对话.

-You could implement conversations spanning several request-response cycles.

一个普通的老式 Servlet 过滤器是最简单的.

A plain old Servlet Filter is the easiest.

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