SQL Server 2000 Stored Procedure & XML Programming in VS .NET

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SQL Server 2000 Stored Procedure & XML Programming
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Raiserror ('Specified lease schedule has not expired yet!', 16,1) If @@Error <> 0 Begin Print 'Unable to eliminate lease amounts from the database!' Return 50000 End -- get lease number Select @chvLeaseNumber = Lease.LeaseNumber From Lease Inner Join LeaseSchedule On Lease.LeaseId = LeaseSchedule.LeaseId Where (LeaseSchedule.ScheduleId = @intLeaseScheduleId) Begin Distributed Transaction -- Set value of Lease of all equipment associated to 0 Update Inventory Set Lease = 0 Where LeaseScheduleId = @intLeaseScheduleId If @@Error <> 0 Goto PROBLEM -- Set total amount of Lease Schedule to 0 Update LeaseSchedule Set PeriodicTotalAmount = 0 Where ScheduleId = @intLeaseScheduleId If @@Error <> 0 Goto PROBLEM -- notify lease vendor Exec @intErrorCode = lease_srvr.LeaseShedules..prLeaseScheduleComplete @chvLeaseNumber, @intLeaseScheduleId If @intErrorCode <> 0 GoTo PROBLEM Commit Transaction Return 0 PROBLEM: print 'Unable to complete lease schedule!' Rollback Transaction Return 50000
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Apart from a reference to the remote stored procedure, the only thing that needed to be done was to use the Distributed keyword to start the transaction. Everything else was managed by MS DTC.
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Transactions are a powerful weapon in the hands of a programmer, but improper use can cause substantial damage. I will try to forewarn you of some typical problems.
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The worst thing that you can do is to explicitly open a transaction and then forget to close it. All changes sent to the database through that connection will become part of that transaction; resources normally released at the end of a transaction are held indefinitely; other users cannot access resources; and eventually, your server chokes.
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Spanning a Transaction over Batches
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A transaction can span batches. SQL Server counts transactions over the connection, so it is legal to issue two batches like this over one connection:
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Begin Transaction update Inventory set Lease = 0 where LeaseScheduleId = 141 Go update LeaseSchedule Set PeriodicTotalAmount = 0 where ScheduleId = 141 Commit Transaction Go
However, I cannot think of any justification for doing so, and you significantly increase the probability of error. For example, you could easily forget to finish the transaction. There are some cases in which it is justified for a transaction to span batches. For example, when a DDL statement must be in a separate batch.
Rollback Before Begin
Sometimes you might set your error handling so that all errors that occur in a stored procedure are treated in the same way. Naturally, you will include a statement to roll back the transaction. If an error occurs before the transaction starts, the stored procedure will jump to the error handling code and another error will occur:
Create Procedure prClearLeaseShedule_1 -- Set value of Lease of all equipment associated -- with expired Lease Schedule to 0
SQL Server 2000 Stored Procedure & XML Programming
-- Set total amount of Lease Schedule to 0. @intLeaseScheduleId int As -- Verify that lease has expired If GetDate() < (select EndDate from LeaseSchedule where ScheduleId = @intLeaseScheduleId) raiserror ('Specified lease schedule has not expired yet!', 16,1) -- If error occurs here, -- server will execute Rollback before transaction is started! if @@Error <> 0 goto PROBLEM Begin Transaction -- Set value of Lease of all equipment associated -- with expired Lease Schedule to 0 update Inventory set Lease = 0 where LeaseScheduleId = @intLeaseScheduleId if @@Error <> 0 goto PROBLEM -- Set total amount of Lease Schedule to 0 update LeaseSchedule Set PeriodicTotalAmount = 0 where ScheduleId = @intLeaseScheduleId if @@Error <> 0 goto PROBLEM commit transaction return 0 PROBLEM: print 'Unable to eliminate lease amounts from the database!' rollback transaction return 1
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