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Hibernate Collection Fetch problem with fixed length CHAR

 
Priya Hota
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I have 2 simple tables called ITEM ( primry key ID CHAR(10)) and BID (FK ITEM_ID CHAR(10) references ID(ITEM)).

Both primary key and foreign keys are CHAR(10)

In the entity I have a bidirectional one to many relationship( Item to Bid [1..N])

Hibernate is not retrieving the list of Bids from Item instance. I am doing eager fetching.The generated sql is just fine but the list is empty.

For Example say ITEM table has got a row with Primary key "ONE"
and BID Table has got 3 rows with BID.ITEM_ID as "ONE"

itemObject.getBids("ONE"); -----> returns an Empty List


How ever if I pad the input with spaces and make its length 10, I can get the Bid collection from Item.

itemObject.getBids("ONE[7 spaces padding]"); -----> returns a list of 3 Bids

I know that this is happening for CHAR datatype, does anyone knows how to solve this?

The detailed source code is in my previous posting in Hibernate forum
http://forum.hibernate.org/viewtopic.php?t=986258&highlight=
"Topic: Hibernate problem with Fixed Length CHAR"
 
Cameron Wallace McKenzie
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Wow, this is interesting.

So, given what we would logically think this in the database:

"abc"

Then, "abc"is not a match.

"       abc" is not a match.

BUT

"abc       " IS a match.

Here's a shot in the dark. Is any part of your application setting BIDI parameters? Some languages read right to left, some left to right? Is there any way your database has a right to left BIDI setting somewhere that is effecting data before it is input into the database?

-Cameron McKenzie
[ April 30, 2008: Message edited by: Cameron Wallace McKenzie ]
 
Priya Hota
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Thanks Cameron for the quick reply.
My DB is DB2zOS version 8 where all the data with type CHAR are stored as right padded.
Hibernate does not have any problem in doing find by primary key(internally it trims the spaces)

But it is not able to retrieve the associated rows in the other(N side of an 1..N relationship) table.
 
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