休眠增加起始号码 [英] Hibernate increment starting number

问题描述

我正在使用hibernate将一个实体保存到我的数据库中。目前它是一个德比数据库，但我很快就会将它移动到Oracle DB中。

在我的classname.hbm.xml中我有这样定义的id ：

 < id name =idtype =long> 
< column name =ID/> 
< generator class =increment/> 
< / id> 
  

如何设置id的起始值？我希望它从10000开始，而不是1开始。 我不认为你可以， IncrementGenerator基于最高主键工作，所以除非你修复了主键（我不建议这样做），否则你会被这个功能所困扰。

会推荐一个不同的策略，它在一组机器中是不安全的...查看Hibernate文档，也许是增强的标识符生成器：

http://docs.jboss.org/ hibernate / stable / core / reference / en / html / mapping.html＃mapping-declaration-id-enhanced

I'm using hibernate to persist an entity to my database. For the moment it's a derby DB, but I will be moving it over to an oracle DB soon.

in my classname.hbm.xml I have the id defined as such:

<id name="id" type="long">
      <column name="ID"/>
      <generator class="increment"/>
</id>

How do I set the starting value for the id? I'd like it to start at something like 10000 rather than 1.

解决方案

I don't think you can, it appears that IncrementGenerator works based off the highest primary key so unless you fix your primary keys (which I wouldn't recommend) you're stuck with that functionality.

Would recommend a different strategy, it isn't safe in a cluster of machines either... Look at the Hibernate docs and maybe the enhanced identifier generators:

http://docs.jboss.org/hibernate/stable/core/reference/en/html/mapping.html#mapping-declaration-id-enhanced

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