why there's not-null property check when deleting objects ?

do1doer · **Joined:** Fri Oct 28, 2005 10:32 pm **Posts:** 13

I delete an object with a property(not the id)
which the attribute not-null is true.
I just create a transient object and set the id to the identifier.
then I called delete(obj).
it failed and throwed a PropertyValueException.

finally I need to set the not-null property to a not null value to settle
this problem.

but what is needed to delete a row
is only the identifier.why does it need this?

thank you in advance.

Principal Skinner · **Joined:** Mon May 02, 2005 6:17 pm **Posts:** 41

delete

public void delete(Object object)
throws HibernateException
Remove a persistent instance from the datastore. The argument may be an instance associated with the receiving Session or a transient instance with an identifier associated with existing persistent state. This operation cascades to associated instances if the association is mapped with cascade="delete".

You need to set the ID of that object. Or you can use query to delete

do1doer · **Joined:** Fri Oct 28, 2005 10:32 pm **Posts:** 13

but I do set the id,which is enough to query the object;
the not null property is another property other than ID.

passos · **Posted:** Wed Oct 18, 2006 4:04 pm

I have the same problem

Hibernate-Version: 3.0.final

HBM

Code:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
    <class name="br.com.teste.model.Categoria" table="CATEGORIA" select-before-update="true">
        <id name="id" type="java.lang.Long">
            <column name="ID" precision="12" scale="0" />
            <generator class="sequence">
               <param name="sequence">SQ_CATEGORIA</param>
            </generator>
        </id>
        <property name="nome" type="java.lang.String">
            <column name="NOME" length="100" not-null="true" />
        </property>
        <set name="produtos" inverse="true">
            <key column="CATEGORIA_ID" />
            <one-to-many class="br.com.teste.model.Produto" />
        </set>
    </class>
</hibernate-mapping>

App

Code:

      Categoria categoria = new Categoria();
      categoria.setId(Long.valueOf("50"));
      
      Session s = HibernateSessionFactory.getSession();
      
      Transaction tx = s.beginTransaction();
      s.delete(categoria);
      tx.commit();
      
      s.close();

Exception

Code:

org.hibernate.PropertyValueException: not-null property references a null or transient value: br.com.teste.model.Categoria.nome
   at org.hibernate.engine.Nullability.checkNullability(Nullability.java:72)