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1. Add debugging code in 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
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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'
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-- prepare loop Select @MaxCounter = Max(Id), @Counter = 1 from #Tables
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while @Counter <= @MaxCounter begin -- get table name select @TableName = TableName from #Tables where Id = @Counter
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-- display space used exec sp_spaceused @TableName
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set @Counter = @Counter + 1 end
drop table #Tables
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.
Developing Professional Habits
Terms of Use
SQL Server 2000 Stored Procedure Programming
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.
THE CONCEPT OF SOURCE CODE CONTROL
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:
w s v
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.
8:
Developing Professional Habits
Introduction to Microsoft Visual SourceSafe
Microsoft s primary purpose in developing Visual SourceSafe as a part of its Visual Studio suite of development tools was to provide a project-oriented means of storing and organizing code that would allow developers to spend more time developing their projects than managing them. The emphasis is on ease of use and integration with a wide range of development tools. SQL Server 7.0 developers can benefit greatly from this ease of use and integration, not only with regard to source code, but also as a means of organizing all related files such as project documentation and test data. As with SQL Server, there are different ways of implementing Visual SourceSafe. It is essentially a client/server application, but if you are an independent developer, your development workstation will likely also be your NT Server, SQL Server, and Visual SourceSafe Server. Of course, if you are an independent developer, you may be wondering what need you have for source code control. I will discuss this issue later in the chapter. For now you can take my word that source code control is just as important for the solo developer working on a simple project as it is for the large development team working on a complex, component-based project. If you are a member of a development team, the Visual SourceSafe client will allow you to work on local copies of code while preventing other members of your team from overwriting your changes while you have the code checked out from the Visual SourceSafe Server. The benefit of this simple concept is obvious, but you have to work with and become comfortable with Visual SourceSafe before its many other benefits will become just as obvious. After you have posted your source code, you can
Get the current version of all files. Check-out a copy of a file that needs to be changed. Visual SourceSafe will prevent all other developers from changing the file until it is returned ( checked-in ) to the Visual SourceSafe database.
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