在Spring Data JPA中，如何在运行时添加实体? [英] In Spring Data JPA, How to add an Entity during runtime ?

问题描述

在我的企业中，我将为MySQL动态创建模型和存储库. 我已经成功创建了Java文件并进行了编译.然后使用beanfactory为存储库和服务注册bean. 但是我不知道如何映射实体.我搜索了一些类似的问题，但是没有一个干净的解决方案. 谁能帮我看看一些代码示例?

In my business, I will to dynamically create model and repository for MySQL. I have successfully create the java file and complied it. then register the bean for repository and service using beanfactory. But I don't have an idea about how to map the Entity. I have searched some similar questions but do not have a clean solution. can anyone help and show me some code samples ?

推荐答案

JPA主要与静态模式一起使用.这样做有充分的理由，请参见www.java.net/node/666078上的讨论.

JPA works mostly with static schema. There are good reasons for this, see discussion on www.java.net/node/666078 .

我只知道3种解决方案:

I know only about 3 solutions:

1)将域模型重构/更改为静态(最好的方法，但在现实世界中，您实际上至少需要1或2个动态表)

1) refactor/ change your domain model to be static ( best way but there are some real world situations where you really need at least 1 or 2 dynamic tables)

2)对动态表使用本机查询和@SqlResultSetMapping(这是我在这种特殊情况下使用的解决方案)

2) use native queries and @SqlResultSetMapping for dynamic tables ( this is solution I am using in such special cases)

3)使用Jpa提供程序的非便携式特定方式(实际上不是JPA)，例如，参见 http://www.infoq.com/articles/hibernate-custom-fields

3) use Jpa provider non portable specific ways ( in fact not JPA) see for example http://www.infoq.com/articles/hibernate-custom-fields

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