7: Debugging and Error Handling in .NET

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7: Debugging and Error Handling
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The Debugging Process
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The objectives of the debugging process are to identify and resolve the defects present in a software product. This process consists of two phases:
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1. Identification 2. Resolution
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Identification
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The identification phase consists of two primary activities:
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1. Stabilize the error. 2. Find the source of the error.
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Stabilize the Error In most cases, identifying the error consumes 95 percent of your debugging time, whereas fixing it often requires just a few minutes. The first step in identifying an error is to stabilize (or isolate) the error. You must make the error repeatable. What this means is that you must find a test case that causes the error to recur predictably. If you are not able to reproduce the error, you will not be able to identify its cause nor will you be able to fix it. But we need to qualify the test case in another way. It is not enough to create a test case that will cause the error to occur predictably. You must also strive to simplify the test case in order to identify the minimum circumstances under which the error will occur. Refining the test case is certainly the most difficult aspect of debugging, and cultivating this skill will greatly enhance your debugging efficiency, while removing a large part of the frustration. Stabilizing the error answers the question, What is the error With this knowledge in hand, you can go on to answer the question, Why does the error occur Find the Source of the Error After you identify the minimum circumstances under which the error will occur, you can proceed to find the source of the error. If your code is properly structured and well written, this search should not be a difficult task. You can apply a variety of tools at this point: Your brain The most important debugging tool at your disposal is your brain. If you can follow the program s execution and understand its logic, you will be able to understand the problem as well. When you have learned
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SQL Server 2000 Stored Procedure & XML Programming
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everything your test cases can teach you, you can create a hypothesis, and then prove it through further testing. SQL Server Some errors will be clearly reported by SQL Server. Be sure that your client application picks up and displays all error messages reported by the server. Also, try using Query Analyzer to execute your stored procedures without the client application. Naturally, you should take care to use the same parameters that were passed from the client application when you produced the error. SQL Profiler Some errors will occur only when the application is executing stored procedures and queries in SQL Server. Too often, the application does not properly collect all error information, and then application and database developers play ping-pong blaming each other for the reported defect. SQL Profiler can resolve such disputes. It can be configured to collect information about events such as stored procedures, transactions, and server, database, and session events. When you analyze the collected data, you will be able to determine which of the stored procedure s calls and parameters are responsible for the individual errors. T-SQL Debugger An integral part of Visual Studio is the T-SQL Debugger. It enables you to set breakpoints in your code and pause execution to investigate and change the contents of local variables, functions, and input and output parameters. The T-SQL Debugger lets you step through the code of your stored procedures and triggers. It is fully integrated with many development environments and lets you move from Visual Basic, JavaScript, C++, or any other client code into a Transact-SQL statement. Query Analyzer in SQL Server 2000 also contains a T-SQL Debugger. It has features similar to the tool provided in Visual Studio.
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