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Solutions to the Exercises
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@To char(20), @Amount money AS Begin Transaction update Account Set Balance = Balance - @Amount where AccountId = @From if @@Error <> 0 GOTO ERR update Account Set Balance = Balance + @Amount where AccountId = @To if @@Error <> 0 GOTO ERR Commit Transaction return 0 ERR: Rollback Transaction Raiserror('Unable to transfer funds!', 16, 1) return 1 GO
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Exercise 6.6
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Is it okay to span a transaction over multiple batches
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Exercise 6.6 Solution
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Technically, it is possible to span a transaction over multiple batches, because SQL Server records them on the level of the user connection. However, it is not a recommended practice, because SQL Server blocks resources until the transaction is completed. It is important to complete the transaction as quickly as possible to release the blocked resources.
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SQL Server 2000 Stored Procedure Programming
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CHAPTER 7. DEBUGGING AND ERROR HANDLING
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Exercise 7.1
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Add debugging code to the following stored procedure:
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Alter Procedure prSpaceUsedByTables_1 -- loop through table names in current database -- display info about amount of space used by each table As Set nocount on declare @MaxCounter int, @Counter int, @TableName sysname Create table #Tables ( Id int identity(1,1), TableName sysname) -- collect table names insert into #Tables(TableName) select name from sysobjects where xtype = 'U' -- prepare loop Select @MaxCounter = Max(Id), @Counter = 1 from #Tables while @Counter <= @MaxCounter begin -- get table name select @TableName = TableName from #Tables where Id = @Counter -- display space used
Appendix B:
Solutions to the Exercises
exec sp_spaceused end drop table #Tables
@TableName
set @Counter = @Counter + 1
Exercise 7.1 Solution
The new stored procedure is saved under a different name:
Create Procedure prSpaceUsedByTables_2 -- loop through table names in current database -- display info about amount of space used by each table @debug int = 0 As Set nocount on declare @MaxCounter int, @Counter int, @TableName sysname Create table #Tables ( Id int identity(1,1), TableName sysname) -- collect table names insert into #Tables(TableName) select name from sysobjects where xtype = 'U' if @debug <> 0 select * from #Tables -- prepare loop Select @MaxCounter = Max(Id), @Counter = 1 from #Tables if @debug <> 0
SQL Server 2000 Stored Procedure Programming
select @MaxCounter MaxCounter while @Counter <= @MaxCounter begin -- get table name select @TableName = TableName from #Tables where Id = @Counter if @debug <> 0 select @TableName TableName -- display space used exec sp_spaceused end Drop Table #Tables @TableName set @Counter = @Counter + 1
Exercise 7.2
Execute the stored procedure through Query Analyzer to review debugging information.
Exercise 7.2 Solution
Use Query Analyzer, as shown in Figure B-6.
Exercise 7.3
Run the stored procedure through TSQL Debugger to try debugging.
Exercise 7.3 Solution
Right-click the procedure in the Object Browser of Query Analyzer. Click Debug and the program will prompt you to specify the parameters values, as shown in Figure B-7.
Appendix B:
Solutions to the Exercises
Figure B-6.
Executing a stored procedure in Query Analyzer
Figure B-7.
Debug Procedure dialog box
SQL Server 2000 Stored Procedure Programming
Set the value of @debug parameter to 0 and click on Execute. The program will launch the T-SQL Debugger window (see Figure B-8). You can now step through the procedure and investigate its local and global variables.
Exercise 7.4
What is the problem with the following code snippet
update LeaseSchedule Set PeriodicTotalAmount = PeriodicTotalAmount + @mnyLease where LeaseId = @intLeaseId If @@Error <> 0 begin Print 'Unexpected error occurred: ' + Convert(varchar, @@Error) Rollback transaction Return @@Error end
Exercise 7.4 Solution
The value of the @@Error global variable is set after every single Transact-SQL statement, including the If statement that is checking its value. Therefore, the Print statement cannot display the Error number as a part of the message. A better solution is the following:
Update LeaseSchedule Set PeriodicTotalAmount = PeriodicTotalAmount + @mnyLease Where LeaseId = @intLeaseId Select @intErrorCode = @@Error If @intErrorCode <> 0 Begin Print 'Unexpected error occurred: ' + Convert(varchar, @intErrorCode) Rollback transaction Return @intErrorCode End
Appendix B:
Solutions to the Exercises
Figure B-8.
T-SQL Debugger window
Exercise 7.5
Change the stored procedure from Exercise 6.5 so that it complies with the error handling solution proposed in this chapter.
Exercise 7.5 Solution
Use the following code:
CREATE PROCEDURE prTransferFunds_2 @From char(20), @To char(20), @Amount money, @debug int = 0 AS
SQL Server 2000 Stored Procedure Programming
set nocount on Declare @intErrorCode int, @intTransactionCountOnEntry int, @chvProcedure sysname Set @chvProcedure = 'prTransferFunds_2' If @debug <> 0 Select '**** '+ @chvProcedure + ' START ****' Select @intErrorCode = @@Error If @intErrorCode = 0 Begin Select @intTransactionCountOnEntry = @@TranCount BEGIN TRANSACTION End If @intErrorCode = 0 Begin update Account Set Balance = Balance - @Amount where AccountId = @From select @intErrorCode = @@Error End If @intErrorCode = 0 Begin Update Account Set Balance = Balance + @Amount Where AccountId = @To Select @intErrorCode = @@Error End
Appendix B:
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