Custom field mappings in query

Question

Hello
In our classes we use GregorianCalendar for date representation.
Therefore I wrote a ColumnFieldMapping class for mapping of
GregorianCalendar to SQL_DATE.
(I used the SQLDateMapping class as example).
The storing and retrieving works without problems.
Just, when I want to query for a specific date, I have to pass a
java.util.Date object as parameter:
String filter = "_dateOfSample >= startDate";
Query query = pm.newQuery(Sample.class, filter);
query.declareParameters("java.util.Date startDate");
Java.util.date startDate = ...
Collection samples = (Collection)query.execute(startDate);
Although, this works fine, I think, that the caller of the query shouldn't
have to know, the DB "internal" representation of a field.
Is there a way, that the parameter is also transformed by the mapping class?
Thanx for any help
-- Pat

Answer 1

Hi Patrick
Thanx for your reply.
What happens if you pass a GregorianCalendar parameter to the query?kodo.util.UserException: The specified parameter of type "class
java.util.GregorianCalendar" is not a valid query parameter.
Also, are you overriding the getDataStoreValue() method in your mapping?No.
I just adapted the SQLDateMapping example.
Now, I've rewritten the mapping class based on IsMaleMapping and everything
works fine.
And it's even easier.
Thanx for your help
-- Pat