barcode generator vb.net download 7: Debugging and Error Handling in Visual Studio .NET

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7: Debugging and Error Handling
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begin select 'List of properties is too long ' + '(over 8000 characters)!' return 1 end -- assemble list set @chvProperties = @chvProperties + @chvProperty + '=' + @chvValue + ' ' + @chvUnit + '; ' if @debug <> 0 select @chvProperties chvProperties -- let's go another round and get another property set @intCounter = @intCounter + 1 end drop table #Properties if @debug <> 0 select '**** '+ @chvProcedure + 'END ****' return 0
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To debug or test a stored procedure, I execute the stored procedure from Query Analyzer with the @debug parameter set to 1:
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declare @chvResult varchar(8000) exec prGetInventoryProperties_2 @intInventoryId = 5, @chvProperties = @chvResult OUTPUT, @debug = 1 select @chvResult Result
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Remember that you can pass parameters either by name or by position. The result of the execution will be an elaborate printout like the one shown in Figure 7-6. Execution in the Production Environment In production, the stored procedure is called without a reference to the @debug parameter. Here, SQL Server assigns a default
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value to the parameter (0), and the stored procedure is executed without debug statements:
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exec prGetInventoryProperties_2 @intInventoryId = 5, @chvProperties = @chvResult OUTPUT
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Nested Stored Procedures Two tricks can help you debug a set of nested stored procedures (that is, when a stored procedure calls another stored procedure). It is a useful practice to display the name of the stored procedure at the beginning and end of the stored procedure:
declare @chvProcedure sysname set @chvProcedure = 'prGetInventoryProperties_2' if @debug <> 0
7: Debugging and Error Handling
select '**** '+ @chvProcedure + 'START ****' ... if @debug <> 0 select '**** '+ @chvProcedure + 'END ****' return 0
When you call a nested stored procedure, you need to pass the value of the @debug parameter to it as well. In this way, you will be able to see its debugging information.
exec prGetInventoryProperties @intInventoryId, @chvProperties OUTPUT, @debug
SQL Profiler
SQL Profiler allows you to monitor and capture events on an instance of SQL Server. You can configure it to capture all events, or just a subset that you need to monitor. It lets you do the following: Capture T-SQL statements that are causing errors Debug individual stored procedures or T-SQL statements Monitor system performance Collect the complete T-SQL load of a production system and replay it in your test environment SQL Profiler can collect external events initiated by end users (such as batch starts or login attempts), as well as internal events initiated by the system (such as individual T-SQL statements from within a stored procedure, table or index scans, objects locks, and transactions).
Using SQL Profiler
SQL Profiler is an MDI application that contains one or more trace windows. A trace window allows you to first configure events, filters, and data columns, and then to collect data from the server that is being audited. After you start SQL Profiler, the first thing you should do is open a new trace window (File | New | Trace) and select the server to be audited. You will be prompted
SQL Server 2000 Stored Procedure & XML Programming
to configure trace properties either manually or by choosing a predefined template (in the Template Name list box):
There are numerous templates available, some of the most useful of which are the following: SQLProfilerStandard.tdf Collects information about connections, stored procedures, and batches that are executed against the server SQLProfilerT-SQL_SPs.tdf Collects information about individual stored procedures and all T-SQL statements initiated within the stored procedure SQLProfilerSP_Counts.tdf Displays stored procedures and the number of times they have been executed SQLProfilerT-SQL_Replay.tdf Collects all T-SQL statements that have been executed against the server to allow you to replay them later (against the same or some other server)
7: Debugging and Error Handling
By default, data is collected on the screen, but it can also be stored in a file or in a database table. The latter two options allow you to preserve the data for future use and further analysis. On the corresponding tabs of the Trace Properties window, you can specify events and data columns to be recorded. Some data columns are not applicable for some events, and SQL Server will leave them empty. It takes a little time and experimentation to learn which are the most useful. I recommend you analyze some of the templates and see how they are built. Filters provide you with a way to avoid information overload. For example, you can decide to monitor only those activities performed just by a particular user, or all activities except those initiated by SQL Profiler in a specific database.
When you have finished modifying the trace properties, you run the trace. Profiler starts to collect data and display it on the screen (see Figure 7-7). When you have gathered enough data, you can pause or stop data collection without closing the window. The top pane displays all specified data columns. In the bottom pane, SQL Profiler displays the complete content of the TextData column for
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