Updating record through cursor


12-Jan-2018 17:06

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When you're using a cursor in SQL you use the FETCH statement to move the cursor to a particular record.

This part of the series examines the FETCH statement in more detail.

- How do I ensure that the row is locked during the above activity?

Sorry for the basic questions, but I'm not a database guy. Hi All, I've been tasked with writing a z/OS C program to read and update a table (DB/2 v8).

My question is this I am updating the qty in pos system everything is working fine but cursor is not holding the same updating record which i am updating untill i insert a next record cursor is moving to the next record cursor should be on 2222 record but moved to next record as I mentioned in uploaded.

updating record through cursor-51

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"ABCE") 3) Write the incremented value back to the table In my code, I'm doing the following: EXEC SQL DECLARE C2 SENSITIVE STATIC SCROLL CURSOR FOR SELECT NEXT_MAILBOX_ID FROM BTMFE_MB_NEXT_AVL FOR UPDATE OF NEXT_MAILBOX_ID; EXEC SQL OPEN C2; EXEC SQL FETCH FROM C2 INTO : OLD_MAILBOXID; // the next value is calculated here and stored in : NEW_MAILBOXID // the new value is then written back to the table EXEC SQL UPDATE BTMFE_MB_NEXT_AVL SET NEXT_MAILBOX_ID = : NEW_MAILBOXID WHERE CURRENT OF C2; EXEC SQL CLOSE C2; It seems a little overkill to use a Cursor for something so simple, but our DBA recommended we use one.

The end of a transaction (commit or rollback) is completely independent of cursors.

So you have to use your own explicit COMMIT statement (or the respective API call).

Where a connection does exist is that all cursors are closed at ROLLBACK and non-holdable cursors are closed at COMMIT (holdable cursors are kept open after the commit).

-- Knut Stolze DB2 Information Integration Development IBM Germany Thanks, Mark. The following is the best solution and will avoid deadlocks: -- increment the sequence number and hold exclusive lock on the row UPDATE sequence_table SET seq_number = seq_number 1 WHERE seq_key = ?

This program (which will run as a Stored Proc) needs to implement a strategy for concurrency as the Stored Proc can be called concurrently by several different users.



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