Hibernate Delete Problem

[Manish Jain]

Hi,
I am very new to the hibernate and I am facing some problem while deleting an object.
I have two tables : one is Person and other is Charge and their mapping is as follows:

 
<class name = "springexample.hibernate.Person"
table="Principal_Person">
 <id
            name="id"
            column="ID" 
            type="java.lang.Long"
            unsaved-value="0"
        >
         <generator class="increment"></generator>
        </id>
<property name="firstName" column = "FIRST_NAME" 
type="java.lang.String"/>
</class>
</hibernate-mapping>
-------------   and ----
<hibernate-mapping>
    <class name="springexample.hibernate.Charge" table="CHARGE">
        
        <id name="id" column="ID" type="long" unsaved-value="0">
            <generator class="increment"/>
        </id>
        <many-to-one name="payer" class="springexample.hibernate.Person"  
column="PERSON_ID" not-null="true" unique="false" lazy="false"/>
    </class>
</hibernate-mapping>
 
   

The problem I am facing with this is when i delete the person, the charge should also be deleted. But only person gets deleted not the charge. Can anyone please help me out how we can do this.

I will really appreciate if anyone can solve this problem.

Manish Jain
SCJP1.4

[Mark Spritzler]

If you want all the charges to be deleted when you delete a person, then you need to map a one to many from Person to Charges, and you must use cascade options. I suggest, "all, delete-orphan"

cascading is what determines how the related objects either get updated, inserted or deleted, when save is called on the main object.

I suggest reading up on cascade options at the hibernate website to fully understand what it means. It is a huge important concept to understand with Hibernate.

Mark

[Rashid Darvesh]

have a look at this tutorial. there is an example there on how to cascade delete
http://www.makemyinfo.com/Tutorial.do?action=getTutorial&tutId=T0005.jsp

Rashid