Custom queries in CMP beans?

Question

Hi everyone,
I need to keep my beans in a tree-like structure...
Therefore I need to associate each bean with a path, such as "root.child.child". I would like to implement this method:
public Collection findByParent(String parent)
      throws FinderException, RemoteException;using this query:
SELECT primkey FROM {table} WHERE LOCATE(?, path) >= 0;
How could I make the EJB container send use this query? I use Orion, so I guess it should be possible to enter this query into orion-ejb-jar.xml, but I'm not sure how. I do NOT want to make the bean BMP!
I would also like to implement a search method. How can I do that?
Thanks in advance,
Nille

Answer 1

You can use EJBQL to execute the query, if you are using ejb2.0. In your ejb-jar.xml you will need to add the query you want to execute something similar to:
<query>
<query-method>
<method-name>findByParent</method-name>
<method-params>
<method-param>String</method-param>
</method-params>
</query-method>
<ejb-ql>SELECT OBJECT(b) FROM YourBean b WHERE b.path LIKE '?1%'</ejb-ql>
</query>
This tag goes after the <primkey-field> inside your beans <entity> tag.
You also need to add the method signiture to your home interface.
public Collection findByParent(String parent) throws FinderException, RemoteException;
And this method should return a Collection of Bean instances.
Hope this helps
Jeremy