Question

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!

Answer 1

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.