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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.

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 .

1. Add debugging code in the following stored procedure:

Table A-1

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)

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-- collect table names insert into #Tables(TableName) select name from sysobjects where xtype = 'U'

7:

2:

while @Counter <= @MaxCounter begin -- get table name select @TableName = TableName from #Tables where Id = @Counter

9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 ( 263 to 263 1 3222121343013 0, 1, or Null 1 1 bytes (up to 8 bits per byte) 5 to 17 bytes -352.4512 8 bytes

2. Execute the stored procedure through Query Analyzer to review debugging information. 3. Run the stored procedure through TSQL Debugger to try debugging. 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

5. Change the stored procedure from exercise 5 in 5 so that it complies with the error handling solution proposed in this chapter. 6. Take the stored procedure from exercise 7 in 4 and wrap it in the error handling solution described in this chapter.

his chapter discusses two critical aspects of application development: Source code control Naming conventions

The very ideas of control and convention may be anathema to some inexperienced developers who view themselves as unconventional characters outside the control of standard social constructs. For experienced professionals, however, using source code control and consistent naming conventions are not onerous tasks but ingrained habits and second nature. Nothing differentiates the professional from the amateur like these two habits.

Source code control (or version control) is typically introduced in development environments where more than one developer needs to work with the same piece of code. If automated tools for source code control are not employed, developers must contend with the following issues:

Exact Numbers 10 to 10 1 (depends on precision and scale)

Manual integration of source code changes Manual management of older versions of source code Greater risk of errors due to lack of constraints

Microsoft provides a source code control package as an integral part of its development tool set under the name Visual SourceSafe. This package allows developers to control their most valuable asset source code. You can also use the Visual SourceSafe database to manage other file types such as Web content, documentation, and test data, but our focus in this chapter is on how to use Visual SourceSafe to manage the development cycle.

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