sql-server , Rollback Transaction when concurrency check fails
Rollback Transaction when concurrency check fails
I have a stored procedure which does a lot of probing of the database to determine if some records should be updated
Each record (Order) has a
I store the candidate record ids and RowVersions in a temporary table called
DECLARE @Ids TABLE (id int, [RowVersion] Binary(8))
I get the count of candidates with the the following
DECLARE @FoundCount int
SELECT @FoundCount = COUNT(*) FROM @Ids
Since records may change from when i
SELECT to when i eventually try to
UPDATE, i need a way to check concurrency and
ROLLBACK TRANSACTION if that check fails
What i have so far
-- create new combinable order group
INSERT INTO CombinableOrders DEFAULT VALUES
-- update orders found into new group
SET Orders.CombinableOrder_Id = SCOPE_IDENTITY()
FROM Orders AS Orders
INNER JOIN @Ids AS Ids
ON Orders.Id = Ids.Id
AND Orders.[RowVersion] = Ids.[RowVersion]
-- if the rows updated dosnt match the rows found, then there must be a concurrecy issue, roll back
IF (@@ROWCOUNT != @FoundCount)
set @Updated = -1
From the above, i'm filtering the
UPDATE with the stored
[RowVersion] this will skip any records that have since been changed (hopefully)
However i'm not quite sure if i'm using transactions or optimistic concurrency in regards to
TIMESTAMP correctly, or if there are better ways to achieve my desired goals
It's difficult to understand what logic you are trying to implement.
But, if you absolutely must perform several non-atomic actions in a procedure and make sure that the whole block of code is not executed again while it is running (for example, by another user), consider using
Places a lock on an application resource.
Your procedure may look similar to this:
CREATE PROCEDURE [dbo].[YourProcedure]
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
DECLARE @VarLockResult int;
EXEC @VarLockResult = sp_getapplock
@Resource = 'UniqueStringFor_app_lock',
@LockMode = 'Exclusive',
@LockOwner = 'Transaction',
@LockTimeout = 60000,
@DbPrincipal = 'public';
IF @VarLockResult >= 0
-- Acquired the lock
-- perform your complex processing
-- populate table with IDs
-- update other tables using IDs
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