I'm trying something similar as defined in:
http://db.apache.org/ojb/tutorial3.html#Support%20for%20non-decomposed%20m:n
%20mappings
Support for non-decomposed m:n mappings, but using a user-defined collection
instead java.util.Collection as in the example with Persons and Projects.
My test example is:
- Classes A and B have id and name attributes.
- Class C is a typed collection of B objects and implements
ManageableCollection.
- Class A has a collection of B objects. (a C attribute)
In the collection descriptor of A I declare the
indirection-table="AB_Table".
Reading from database is OK, but when saving an A object I got a
ClassCastException.
Has anyone got success with something similar like this?
This is my test repository_user.xml:
<class-descriptor
class="A"
table="A_Table"
>
<field-descriptor id="1"
name="id"
column="id"
jdbc-type="INTEGER"
primarykey="true"
autoincrement="true"
/>
<field-descriptor id="2"
name="name"
column="name"
jdbc-type="VARCHAR"
/>
<collection-descriptor
name="collection"
collection-class="C"
element-class-ref="B"
indirection-table="AB_Table"
auto-delete="true"
>
<fk-pointing-to-this-class column="idA"/>
<fk-pointing-to-element-class column="idB"/>
</collection-descriptor>
</class-descriptor>
<class-descriptor
class="B"
table="B_Table"
>
<field-descriptor id="1"
name="id"
column="id"
jdbc-type="INTEGER"
primarykey="true"
autoincrement="true"
/>
<field-descriptor id="2"
name="name"
column="name"
jdbc-type="VARCHAR"
/>
</class-descriptor>
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