我如何获得Hibernate逆向工程工具来生成< bag>或< list>反向关联？ [英] How do I get the Hibernate reverse engineering tools to generate <bag> or <list> for inverse associations?

问题描述

我想将元素添加到集合中，最终得到像这样映射：

 < set name =others inverse =truelazy =truetable =otherfetch =select> 
< key> 
< column name =otherIdnot-null =true/> 
< / key> 
<一对多课程=my.pkg.OtherEntity/> 
< / set> 
  

我希望使用Hibernate，因为我不关心它们的顺序检索到，我只是想保持该协会的一面最新。根据 https://www.hibernate.org/117.html ，Hibernate可以添加到< bag>，< idbag>或< list>以inverse =true声明并且未初始化集合。 我的问题是我不'不知道如何强制（或建议）逆向工程工具（hibernate-tools.jar）来使用< bag>或< list> - 它总是使用< set>。

谢谢！

解决方案

您可以使用反向工程配置文件自定义逆向工程过程，该文件使用XML语法。我没有尝试过这个，但这个例子可能适合你：

 <？xml version =1.0编码= UTF-8 >？; 
<！DOCTYPE hibernate-reverse-engineering SYSTEM 
http://hibernate.sourceforge.net/hibernate-reverse-engineering-3.0.dtd\"> 
< hibernate-reverse-engineering> 
< table name =MYTABLE> 
< column name =otherstype =bag/> 
< / table> 
< / hibernate-reverse-engineering> 
  

如果它不能正常工作，您可能会发现更多关于控制逆向工程过程的细节< here 。

I want to add elements to a collection that ends up getting mapped like this:

<set name="others" inverse="true" lazy="true" table="other" fetch="select">
  <key>
    <column name="otherId" not-null="true" />
  </key>
  <one-to-many class="my.pkg.OtherEntity" />
</set>

I'd like Hibernate to use instead, because I don't care about the order they're retrieved in, I just want to keep that side of the association up-to-date. According to https://www.hibernate.org/117.html, "Hibernate can add to a <bag>, <idbag> or <list> declared with inverse="true" without initializing the collection."

My problem is I don't know how to force (or suggest to) the reverse engineering tools (hibernate-tools.jar) to use <bag> or <list>--it ALWAYS uses <set>.

Thanks!

解决方案

You can customize the reverse engineering procedure with a reverse-engineering configuration file, which uses an XML syntax. I haven't tried this myself, but this example may work for you:

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE hibernate-reverse-engineering SYSTEM
    "http://hibernate.sourceforge.net/hibernate-reverse-engineering-3.0.dtd">
<hibernate-reverse-engineering>
    <table name="MYTABLE">
        <column name="others" type="bag"/>
    </table>
</hibernate-reverse-engineering>

If it does not work as it is, you may find more details about controlling the reverse engineering process here.

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