Specify relationship in mapping using some condition not just id's.

[Sandeep Vaid]

Say i have one-to-many relationship between Product and ProductNames
Product ----> PID (PK)
ProductNames------> PID, USECODE, STARTTIME as composite ID and ENDTIME is another normal column.

Now i want to fetch product with PID='1' and USECODE='100' and STARTTIME < CURRENTTIME < ENDTIME.

CURRENTTIME value will be known at runtime.

How to specify this in mapping and fetch Product & ProductNames using eager fetching?

[Paul Sturrock]

Why do you want to specify this in the mapping rather than as a query? Doesn't that limit your model?

[Sandeep Vaid]

Paul,
As currentTime value is only known at runtime, i can;t specify it's value in mapping.

Using Filters, this problem can be resolved. Define filter, attach filter and enable filter. Filter supports specifying positional parameters value at runtime.
but i got 1 problem with filters :
Suppose i have 1 product with id as 100, it has 5 ProductNames..but when we apply filter only 2 productNames remains.

When i use just "inner join fetch" with no filters, it returns me one Product object which contains List of productNames properly
populated.
BUT When i use "select distinct product" and inner join fetch" with filter, it returns one product populated with productNames
list which contains 3 elements viz. null, first filtered productName, second filtered productName..

Why productNames list contains the first element as null? This seems to be a bug..