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Unique Constraints

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LORDs_diakonos

Post subject: Unique Constraints

Posted: Thu Jan 12, 2006 9:22 am

Beginner

Joined: Sun Dec 05, 2004 10:25 am
Posts: 23

I am using Hibernate 3.0 and was wondering if Hibernate had support for applying a contraint on multiple columns/attributes?

In other works I have a table that has 4 columns an id and the other 3 have a unique constraint in the database. I am wondering if Hibernate could handle this constraint for me in Java?

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urs_b

Post subject:

Posted: Thu Jan 12, 2006 12:33 pm

Regular

Joined: Tue Jan 03, 2006 9:52 am
Posts: 52
Location: Zurich

I think your are looking for something like this:

Code:

  <class name="eg.TTest" table="TTest">
    <id name="id" column="id" type="long"> 
      <generator class="native"></generator>
    </id>
    <properties name="group"  unique="true">
      <property name="one"/>
      <property name="two"/>
      <property name="three"/>
    </properties>

  </class>

which creates: