Hi All!

I would like to write CLI program that can watch for a state change
of a table, i.e. when a row is inserted, updated or delete. Let's say I have a queue stored in a single table and I would like my program to watch for queue state changes and display them to the user in a GUI. Of course the program can pull for changes in a loop and display the queue state in every iteration but that is quite clumsy. Is there a way for my CLI program to be notified or to be woken up when there is any change in the table?

What DB2 feature can be used for this?

Do you guys have any ideas?

Thanks in advance.

Alexander

I would look at using triggers to update another status table any time the table in question has been changed. You could log the exact timestamp the table has been inserted, updated or deleted, as well as any other information you needed.

Thanks for your reply!

Actually my problem is not recording the changes but to have my ODBC/CLI program being notified that something has been changed. In that way the program does not need to continuesly query the database and check for changes. I am not sure what I want is possible but there might be some trick I do not know about

You can create a non-SQL UDF (in C, Java etc) that will 'alert' your program ....
For eg, write a file to a directory and your CLI program can get activated when the file is found.

Inside the trigger, call the UDF

VALUES(WRITEFILEUDF())


For information on creating UDFs, refer Appl Development manuals


HTH

Sathyaram