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SQL Server 2000 Stored Procedure Programming
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@intStatusId, @mnyLease, Select @intErrorCode = @@Error,
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@intLeaseId, @intAcquisitionTypeID)
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@intLeaseScheduleId,@intOwnerId,
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@intInventoryId = @@identity end If @intErrorCode = 0 begin -- update total update LeaseSchedule Set PeriodicTotalAmount = PeriodicTotalAmount + @mnyLease where LeaseId = @intLeaseId Select @intErrorCode = @@Error end If @@TranCount > @intTransactionCountOnEntry Begin If @@Error = 0 COMMIT TRANSACTION Else ROLLBACK TRANSACTION End return @intErrorCode
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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)
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Debugging and Error Handling
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( @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, Lease, values ( @intStatusId, @mnyLease, -- update total update LeaseSchedule Set PeriodicTotalAmount = PeriodicTotalAmount + @mnyLease where LeaseId = @intLeaseId commit transaction return (0) LocationId, LeaseId, AcquisitionTypeID) @intLeaseId, @intAcquisitionTypeID)
LeaseScheduleId, OwnerId, @intEquipmentId, @intLocationId, @intLeaseScheduleId,@intOwnerId,
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.
SQL Server 2000 Stored Procedure Programming
Raiserror
An important tool for implementing error handling is the RAISERROR statement. Its main purpose is to return a message to the user. Open Query Analyzer and execute the following statement:
Raiserror ('Error occurred!', 0, 1)
The server will display an error message in the Result pane (see Figure 7-7). The numbers specified as second and third parameters indicate the severity and state of the error. Naturally, this statement does more than return this meager result. It also sets the value of the @@error global variable (function) to the number of the error that you have raised. If you do not specify a number (as we did not in the previous example), SQL Server will assign an error number of 50000 to it.
Figure 7-7.
Using Raiserror
7:
Debugging and Error Handling
You can also display errors that are predefined in SQL Server if you reference them by their numbers, and you can also define your own errors using the sp_addmessage system stored procedure:
Exec sp_addmessage 50001, 16, 'Unable to update Total of LeaseSchedule'
Then you can display this message using the following statement:
Raiserror (50001, 16, 1)
The server will return the following:
Server: Msg 50001, Level 16, State 1, Line 1 Unable to update Total of LeaseSchedule
You can set the state and severity of the error and/or record the error in the SQL Server Error Log, and even in the Windows NT Error Log:
Raiserror (50001, 16, 1) WITH LOG
SUMMARY
Some developers consider debugging the most difficult part of the development process. However, a systematic approach, common sense, and modern debugging tools can significantly reduce the effort required to solve errors. This chapter has presented an overview of bugs and the process of debugging in general. We have presented a systematic approach to the debugging process. We have discussed the configuration and use of TSQL Debugger. We have discussed debugging without TSQL Debugger and looked at some of the most common errors found in Transact-SQL. We have demonstrated two solutions for handling errors inside Transact-SQL code. You should choose one and make a habit of using it. Personally, I do not like to use XACT_ABORT because I can exercise more control by investigating the @@error function.
SQL Server 2000 Stored Procedure Programming
Critics might object to this solution, because it adds a significant amount of code to the script, and they might add that the solution would be improved if the developer could hide error handling to emphasize the statements that are performing the real processing. But the real value of this error handling solution is that it is a coherent solution that permits the code in stored procedures to work in a uniform manner and lets developers know what to expect when the unexpected occurs. So, until Microsoft creates something new .
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