How to set null value for a date column using database adapter

Hello,
I have a table wih 3 columns
(id NUMBER,
modified_on DATE
contentText VARCHAR2)
I have a row wih theses values (1, 20/03/2010 16:30, 'coucou')
I want use a DB adapter in a BPEL process to change the value of column modified_on to (null). I'm using the out-of-he box "update" method (no custom sql, nieher "insert or update (merge)" method)
- If I only set values of "Id" and "contentText" -> insert is done but I missed the modification of "modified_on" to (null)
- If I set all values and use expression '' (2 single quote without any space) for modified_on I got an error on update
BWriteInteractionSpec Execute Failed Exception.
update failed. Descriptor name: [DBUTFORM.TForm]. [Caused by: String index out of range: 10]
Caused by Exception [TOPLINK-3001] (Oracle TopLink - 10g Release 3 (10.1.3.3.0) (Build 070608)): oracle.toplink.exceptions.ConversionException
Exception Description: The object [xs:datetime], of class [class java.lang.String], could not be converted to [class java.sql.Timestamp].
Internal Exception: java.lang.StringIndexOutOfBoundsException: String index out of range: 10.
Thanks for help

1008318 wrote:
its my personal need..then it is a very bad personal need. DATE is not an appropriate type to be using for a primary key, as it cannot be guaranteed to be unique, especially when inserting multiple rows at once.
You would be better working to business needs and implementing correct technical solutions to those needs, than to just do things based on your personal needs.

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Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact
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