How to update collection entities via saveOrUpdateCopy

borak · **Posted:** Sun Feb 27, 2005 10:07 am

Class Person has list of Class House instances

and X has a business key, where as y has "sequence" id.

Suppose in one session, I save Person p
calling saveOrUpdateCopy(p) with saving person's homes with cascade=all

Then in another session, I created new Person instance with same identifier and with a new list of houses.
Then I call saveOrUpdateCopy(p), it correctly calls update for person (Since id's are same) and it inserst the houses to the House table.

I wonder that how can I delete the previous houses list?
I mean how can I map such a logic via hibernate:

If a owner of collection is updated with saveOrUpdateCopy, get List of collection entities from database, "DELETE ALL" and insert new entites? How to update collection entities via saveOrUpdateCopy????

mikr · **Joined:** Mon Mar 07, 2005 5:29 am **Posts:** 8

I have an Object ParamX which stores 2 Lists.
I can fill te list using Methodes in ParamX, when i call create the 2 Lists were stored in separate tables => All OK!
But when i modify the lists (clear and add new entries) of the ParamX-Object and call the update-Methode the new entries don't override the old entries.

The old entries still appear plus the new!

What must i do to remove the previous listentries if they are not any longer in the list when i call update??

Code:

<!DOCTYPE hibernate-mapping SYSTEM 
   "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd" >

<hibernate-mapping package="packagexy....">
   
   <class name="ParamX" table="paramx" >

      <id name="id" column="uid" type="long">
         <generator class="assigned"/>
      </id>

      <property name="date">
         <column name="date"/>
      </property>
      <property name="time">
         <column name="time"/>
      </property>
      <property name="user">
         <column name="user"/>
      </property>

      <list name ="listA" table="listA">
         <key column="uid" />
         <index column="posn" />
         <composite-element class="InfoDataA">
            <property name="name" type="string" />
            <property name="gv" type="string" />
            <property name="gvArt" type="string" />
         </composite-element>
      </list>

      <list name ="listB" table="listB">
         <key column="uid" />
         <index column="posn" />
         <composite-element class="InfoDataB">
            <property name="name" type="string" />
            <property name="gv" type="string" />
         </composite-element>
      </list>
   </class>

</hibernate-mapping>

mikr · **Joined:** Mon Mar 07, 2005 5:29 am **Posts:** 8

I had an error in my Java implementation where i clear and update my list!

Now it runs fine!

borak · **Posted:** Thu Mar 10, 2005 6:01 am

Sorry, but I can say that we are not talking about the same thing.

Your case is the simple saveOrUpdate scenario for collections.