How to search on a transient attribute in a VO ?

Hi,
I want to search on a field, on my page, that's not in the database. So I created a transient attribute, in the view object, that is queriable so it appears on the find page.(with JDeveloper/JHeadstart) But when I use the attribute in the where clause of the View Object I get the following error: "SQL Query Error Message: ORA-00904 "STATUSGROEP": invalid identifier".
I also tried to use a bind variable (:1) instead of the attribute name in the where clause but then I get the runtime error: "java.sql.SQLException: ORA-01008: not all variables bound".
What am I doing wrong ?
Regards,
Chris van Dijk

Michiel / Chris
Based on the find attributes, JHeadstart automatically adds a SQL WHERE CLAUSE to the ViewObject. Since transient attribute do not map to a valid column name, this will not work.
I built a little testcase with a transient attribute, and it was simply ignored, I did not get the ORA-904. From your description, it looks like you added some bind variables to the ViewObject as well. That is not supported in combination with find pages, unless you overwrite method
DataObjectSet getDataObjectSet(String queryType, HashMap arguments, Object sessionId, int startRange , int rangeSize)
on the handler.
Anyway, if you really want to filter on a transient attribute, you will have to do that in java code, overriding the aforementioned method:
- remove the transient attribute from the arguments HashMap
- call super to execute the query without the transient attribute
- loop over the result set and remove the rows that do not match with the transient attribute value.
This might be quite slow, depending on the size of the result set returned by the query. Can't you somehow translate the transient attribute value to some SQL column values so all filtering can be done using SQL?
Steven Davelaar,
JHeadstart Team.

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