JPA自动增量的差异

Question

When I want to set my PK auto increment(MySQL), I can do it by table settings in database, or by anotation 当我要设置PK自动增量（MySQL）时，可以通过数据库中的表设置或注释来完成

@GeneratedValue(strategy=GenerationType.IDENTITY)

My question is, what is difference and why use which access. 我的问题是，有什么区别，为什么要使用哪个访问权限。 Is one of them better? 其中之一更好吗？ Thanx for answers! 谢谢答案！

Answer 1

I would have thought that the docs for any JPA implementation would explain all of that http://wiki.eclipse.org/EclipseLink/UserGuide/JPA/Basic_JPA_Development/Entities/Ids/GeneratedValue 我以为任何JPA实施的文档都可以解释所有这些http://wiki.eclipse.org/EclipseLink/UserGuide/JPA/Basic_JPA_Development/Entities/Ids/GeneratedValue

http://www.datanucleus.org/products/accessplatform_4_0/jpa/value_generation.html http://www.datanucleus.org/products/accessplatform_4_0/jpa/value_generation.html

JPA自动增量的差异

问题描述

1 个解决方案

解决方案1
0 已采纳 2015-02-02 18:47:29

JPA自动增量的差异

问题描述

1 个解决方案

解决方案1 0 已采纳 2015-02-02 18:47:29

解决方案1
0 已采纳 2015-02-02 18:47:29