Hibernate - session.delete() doesn't set identifier to null

Question

I have 2 classes and they're mapped as 1-to-1

class B mapping:

<one-to-one class="ClassA" constrained="true" name="a" property-ref="bId"/>

class A mapping:

<property insert="false" name="bId" type="integer" update="false">
      <column length="200" name="BID" not-null="false"/>
 </property>
 <many-to-one class="ClassB"  name="b">
       <column name="BID" not-null="false"/>
 </many-to-one>

when i call:

A a = (A) session.load(A.class, 1);    
session.delete(a.getB());

B record gets deleted, but BID in A stays intact. Why!? Any help is appreciated.

Actually, the mapping is n-to-1 (many-to-one) not 1-to-1 (one-to-one) for class A. — Thomas
– Thomas, Commented Mar 14, 2012 at 13:51
Do you have bId in A or reverse? Which is the parent in this relationship A or B? — ManuPK
– ManuPK, Commented Mar 14, 2012 at 14:17

Johanna · Accepted Answer · 2012-03-14 15:23:45Z

1

Yes, that's correct. Hibernate does not modify the object a. Hibernate can't do it. In the call session.delete(a.getB()) you give an instance of class B. This instance does not contain any reference to the object a.

You have to change a manually and update it.

An other possibility:

You move the foreign key from A to B (in one-to-one relations it doesn't matter which table has the foreign key). When you delete an instance of B then, you don't need to update A. [Or you use cascade=all,delete-orphan, then you can set the reference in a to null and update a, which will force hibernate to delete the instance of B. But I never tried this possibility.]

answered Mar 14, 2012 at 15:23

Johanna

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1 Comment

emmma1223 Over a year ago

Thanks for response. But it seams i can't change it manually cuz i have insert=false update=false in this property. And i cant move foreign key. Please help me!

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