Re: non-decomposed m:n mapping deleting incorrectly

[Michael Becke]

Hi Chris,

This is because OJB uses the RemovalAwareCollection for collections by 
default.  This collection deletes all objects that are removed.  You 
want to switch to one of the Manageable collections 
<http://db.apache.org/ojb/api/org/apache/ojb/broker/util/collections/package-summary.html>. 
 You will need to add the "collection-class" attribute to your 
collection descriptor to specify which class to use. It will look 
something like:

<collection-descriptor
          name="monitors"
          element-class-ref="com.contego.arx.domain.Monitor" 
collection-class="org.apache.ojb.broker.util.collections.ManageableArrayList"
          auto-retrieve="true"
          auto-update="false"
          auto-delete="false"
          indirection-table="ccp_monitor_package_monitor">
          <fk-pointing-to-this-class column="monitor_package_id"/>
          <fk-pointing-to-element-class column="monitor_id"/>
 </collection-descriptor>

Mike

Chris Widhelm wrote:
Does anyone have any ideas on this?

It just seems odd that by removing an item from a collection that it
performs a delete on the object that is in the collection.
Thanks,

Chris

----- Original Message ----- 
From: "Chris Widhelm" <[EMAIL PROTECTED]>
To: "OJB Users List" <[EMAIL PROTECTED]>
Sent: Thursday, September 04, 2003 4:21 PM
Subject: non-decomposed m:n mapping deleting incorrectly

I have a non-decomposed m:n mapping set up with an inderection table and for
some reason when I call Collection.remove( Object ) it is deleting not only
the mapping in the inderection table, but also the object that is mapped by
the inderection table.
How do I stop this behavior?

See my configuration below:

===================================
<class-descriptor class="com.contego.arx.domain.Monitor"
table="ccp_monitor">
    <field-descriptor
        name="id"
        column="id"
        jdbc-type="INTEGER"
        primarykey="true"
        autoincrement="true"/>
    <field-descriptor
        name="monitorName"
        column="monitor_name"
        jdbc-type="VARCHAR"/>
    <field-descriptor
        name="displayName"
        column="display_name"
        jdbc-type="VARCHAR"/>
    <field-descriptor
        name="description"
        column="description"
        jdbc-type="VARCHAR"/>
    <field-descriptor
        name="configurationString"
        column="configuration_string"
        jdbc-type="VARCHAR"/>
    <field-descriptor
        name="url"
        column="url"
        jdbc-type="VARCHAR"/>
</class-descriptor>
<class-descriptor class="com.contego.arx.domain.MonitorPackage"
table="ccp_monitor_package">
    <field-descriptor
        name="id"
        column="id"
        jdbc-type="INTEGER"
        primarykey="true"
        autoincrement="true"/>
    <field-descriptor
        name="packageName"
        column="package_name"
        jdbc-type="VARCHAR"/>
    <field-descriptor
        name="description"
        column="description"
        jdbc-type="VARCHAR"/>
 <collection-descriptor
         name="monitors"
         element-class-ref="com.contego.arx.domain.Monitor"
         auto-retrieve="true"
         auto-update="false"
     auto-delete="false"
         indirection-table="ccp_monitor_package_monitor">
         <fk-pointing-to-this-class column="monitor_package_id"/>
         <fk-pointing-to-element-class column="monitor_id"/>
 </collection-descriptor>
</class-descriptor>
===================================

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