Customizing 1:1 querys like customized collection queries

[jo...@on-ergy.de]

Hello OJB-Users,

I have even started using OJB and so far all works fine :o) (1:1, 1:n...)
I would be pleased when you can help me with my first Problem.

I'm looking for an solution like 'Customizing collection queries' 
descriped in the Guide 'advanced O/R technique' for 1:1 references.

A short example:

I have multible tables (named parts, driver...) and for each entry of a 
table i can reference to ONE entry of a table named memo across the 
primary-key as foreign key in the memo-table.
To have a unique key, I musst save a second value in the memo-table to 
know from which table the foreign-key comes. This value is a String and is 
hardcoded in the software.
For table parts i save = "part" in the table Memo field parentTable
For table driver i save = "driv" in the table Memo field parentTable

Now, when I'm loading the memo to an item of the parts-table, I want' only 
load the memo where in table Memo parentTable="part"

With a 1:n, thats no Problem, because I can work with the query-customizer 
like this
################################
<inverse-foreignkey field-ref="parentObjId"/>
   <query-customizer
   class="de.on_ergy.lakon.data.QueryCustomizerLakonImpl">
   <attribute
   attribute-name="parentTable"
   attribute-value="TEILSTAM"
   />
</query-customizer>
################################

There I can add the value "TEILSTAM" to the Query with the written 
QueryCustomizerLakonImpl

But how can I realize this with 1:1 ??

Thank you very very much for your help.

Best Wishes

Josef Wagner
/Germany