Setting field to NULL using script does not work

Question

Hi,
This is a Hibernate and Oracle SQL developer-related question.
My application uses salesmeeting with customers and an officer. When the salesmeeting is active, OfficerID is set to the salesmeeting. If the officer closes the salesmeeting, officerID shall be set to NULL. Now, sometimes when explorer doesn't close correctly, the OfficerID is still set in the database. So, when another officer tries to login to the salesmeeting it's is locked by the first officer because only one officer at the time can access a salesmeeting.
Now to the problem: I'm trying to develop a script which simply updates the database and sets the officerID for a specific salesmeeting to NULL in order to "unlock" that salesmeeting.
The script looks like this:
UPDATE SALESMEETING SET OFFICERID = NULL
WHERE OFFICERID = 'XXXXX' AND SALESMEETINGID = '12345'
I commit the changes and OfficerID is set to NULL or (null) as it looks is SQL developer.
When logging in to the application, officerID is set to the active officer, so far so good. But, when running the Hibernate method saveOrUpdate() for the salesmeeting, the server hangs and nothing happens.
The thing is, when I manually set officerID to NULL by simply leaving the field blank, saveOrUpdate() works perfectly fine.
The third way of setting trying to set the value to null, by manually setting officerID
by typing (null) in the field generates another problem (I guess this is interpreted as the String "(null)")?
So, what I am wondering is what my script does wrong, is it not really setting officerID to NULL or is there something I need to understand about Hibernates saveOrUpdate()?
Thanks!
Message was edited by:
user615023

Answer 1

Hi,
To set a column to null, you have written right script.
Please make sure that 'null' & null are entirly different thing.
may be when system get hang, you might have written 'null' in stead of null.
Thanks.