7: Debugging and Error Handling in .NET

Generator DataMatrix in .NET 7: Debugging and Error Handling

7: Debugging and Error Handling
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@intLocationId int, @intStatusId int, @intLeaseId int, @intLeaseScheduleId int, @intOwnerId int, @mnyLease money, @intAcquisitionTypeID int, @intInventoryId int OUTPUT ) As set nocount on Declare @intErrorCode int, @intTransactionCountOnEntry int Select @intErrorCode = @@error If @intErrorCode = 0 Begin Select @intTransactionCountOnEntry = @@TranCount BEGIN TRANSACTION End If @intErrorCode = 0 begin -- insert asset insert Inventory(EquipmentId, StatusId, LeaseScheduleId, Lease, values ( @intEquipmentId, @intStatusId, @intLeaseScheduleId, @mnyLease, Select @intErrorCode = @@error, @intInventoryId = @@identity end
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LocationId, LeaseId, OwnerId, AcquisitionTypeID) @intLocationId, @intLeaseId, @intOwnerId, @intAcquisitionTypeID)
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If @intErrorCode = 0 begin -- update total update LeaseSchedule Set PeriodicTotalAmount = PeriodicTotalAmount + @mnyLease where LeaseId = @intLeaseId
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SQL Server 2000 Stored Procedure & XML Programming
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Select @intErrorCode = @@error end If @@TranCount > @intTransactionCountOnEntry Begin If @@error = 0 COMMIT TRANSACTION Else ROLLBACK TRANSACTION End return @intErrorCode
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Xact_Abort
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SQL Server does, in fact, have an equivalent to the On Error Go To command used by Visual Basic. The Set Xact_Abort statement forces SQL Server to roll back the complete transaction and stop further processing on the occurrence of any error:
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create Procedure prInsertLeasedAsset_7 -- Insert leased asset and update total in LeaseSchedule. -- (demonstration of imperfect solution) ( @intEquipmentId int, @intLocationId int, @intStatusId int, @intLeaseId int, @intLeaseScheduleId int, @intOwnerId int, @mnyLease money, @intAcquisitionTypeID int ) As set nocount on SET XACT_ABORT ON begin transaction -- insert asset insert Inventory(EquipmentId, StatusId, LeaseScheduleId, Lease, values ( @intEquipmentId,
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LocationId, LeaseId, OwnerId, AcquisitionTypeID) @intLocationId,
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7: Debugging and Error Handling
@intStatusId, @intLeaseId, @intLeaseScheduleId, @intOwnerId, @mnyLease, @intAcquisitionTypeID) -- update total update LeaseSchedule Set PeriodicTotalAmount = PeriodicTotalAmount + @mnyLease where LeaseId = @intLeaseId commit transaction return (0)
Unfortunately, this solution presents a problem. This statement will also completely stop execution of the current batch. The error can still be detected and handled from the client application, but inside the Transact-SQL code, SQL Server will treat it as a fatal error. Another problem is that the Set Xact_Abort statement does not detect compilation errors. According to SQL Server Books Online: Compile errors, such as syntax errors, are not affected by Set Xact_Abort. Unfortunately, because of deferred name resolution, compilation errors can occur at runtime as well. By editing the stored procedure from the previous example, the Update statement references a nonexistent table:
-- update total update LeaseSchedule_NON_EXISTING_TABLE Set PeriodicTotalAmount = PeriodicTotalAmount + @mnyLease where LeaseId = @intLeaseId
Next, run the stored procedure:
Exec prInsertLeasedAsset_8 @intEquipmentId = 100, @intLocationId = 1, @intStatusId = 1, @intLeaseId = 1, @intLeaseScheduleId = 1, @intOwnerId = 1, @mnyLease = 5000, @intAcquisitionTypeID = 1 -- test transaction select * from Inventory
SQL Server 2000 Stored Procedure & XML Programming
where EquipmentId = 100 and LocationId = 1
SQL Server simply stops the execution of the stored procedure without a rollback:
Server: Msg 208, Level 16, State 1, Procedure prInsertLeasedAsset_8, Line 30 Invalid object name 'LeaseSchedule_NON_EXISTING_TABLE'. Server: Msg 266, Level 16, State 1, Procedure prInsertLeasedAsset_8, Line 36 Transaction count after EXECUTE indicates that a COMMIT or ROLLBACK TRANSACTION statement is missing. Previous count = 0, current count = 1. EquipmentId LocationId StatusId Lease ----------- ----------- -------- -----------100 1 1 5000.0000
This is a potentially significant problem. The official response concerning my support question on this matter was that SQL Server is behaving as specified in SQL Server Books Online. Developers have different expectations in the case of an error, the transaction should be rolled back. This explanation makes it sound like the Set Xact_Abort statement is useless. Fortunately, the stored procedure will be promoted to production only after detailed unit testing, and therefore it should not reference nonexistent tables. However, there is an additional problem: only the stored procedure with the syntax error is aborted. Assume that the stored procedure is executed as a nested stored procedure and that the compilation error occurs in the inner stored procedure. The earlier procedure is split into two procedures to demonstrate this scenario:
Create Procedure prUpdateLeaseSchedule @intLeaseId int, @mnyLease int as update LeaseSchedule_NON_EXISTING_TABLE set PeriodicTotalAmount = PeriodicTotalAmount + @mnyLease where LeaseId = @intLeaseId return (0) GO create Procedure prInsertLeasedAsset_9 -- Insert leased asset and update total in LeaseSchedule. -- (demonstration of compilation error in nested stored procedure) ( @intEquipmentId int, @intLocationId int,
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