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Resolving defects in code is usually much easier than finding those defects, but do not take this phase too lightly. At this point in the development cycle, when the product shipping date is looming large, you may be tempted by the quick fix. Resist this temptation: it often causes developers to introduce new errors while fixing the old ones. It is seldom an issue of carelessness or incompetence, but rather of increased pressure to fix and ship a product. The resolution phase consists of two primary activities:
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1. Develop the solution in a test environment. 2. Implement the solution in the production environment.
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7: Debugging and Error Handling
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Develop the Solution in a Test Environment To consistently resolve defects in your code, you need to assemble two critical ingredients a test environment and source code control. Test environment SQL Server is especially susceptible to errors generated in haste to solve a problem because a stored procedure is compiled and saved as a single action. If you are trying to resolve defects on the production system, you are performing brain surgery in vivo. Although it is possible to perform fixes in a production environment, it is always much better to step back, spend adequate time understanding the problem, and then attempt to solve the problem outside of the production environment. If a test environment does not exist or if the existing test environment is outdated, you may be tempted to save time with a quick and dirty fix. Before you go down this path, however, you should consider the resources that would be required to reverse the changes made if you happen to make a mistake. Anything you do, you should be able to undo quickly and easily. Let it be understood, loud and clear: you need a test environment! Source code control Keep source code of your procedures and database objects. Source code control gives you a snapshot of your application at critical points in the development cycle and allows you to turn back the clock. It gives you the ability to reverse changes if you find they have introduced new problems or failed to solve the existing one. Visual SourceSafe, which is examined in 11, is a perfect tool for this function. Source code control works best if you take a patient approach to debugging. You should save versions often to help you identify the source of errors when they occur. It is a poor practice to make multiple changes per version. Old and new errors tend to overlap and lead you to incorrect conclusions. Implement the Solution in the Production Environment Once you are satisfied with the change, you should implement it in the production environment. Then test. Then test again. You should not assume that it will work in the production environment because it worked in the test environment. If, after stringent testing, everything is still functioning properly, you should then look for other places in the code and database structure where similar errors may exist.
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Modern development environments contain sophisticated tools to help you debug your applications. The T-SQL Debugger in Visual Studio and the T-SQL Debugger in Query Analyzer are examples of these tools, and will help you to identify and fix problems in your code. I will first examine the T-SQL Debugger in Visual Studio, and then in Query Analyzer. However, even if your development environment does not support the T-SQL Debugger, there are techniques you can employ to achieve the same results. I will discuss these techniques in Poor Man s Debugger later in this chapter.
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The T-SQL Debugger is a dream tool for developers working in Visual Studio to find errors in a Microsoft SQL Server environment, but there is a downside: the T-SQL Debugger from Visual Studio is difficult to install and configure. This difficulty arises from the nature of the environment and the complexity of the components required for debugging. The T-SQL Debugger was initially released as a part of Visual C++ 4.2. Now it is a component of the Enterprise Edition of all Visual Studio tools (such as Visual Basic and Visual InterDev). Requirements Before you continue, make sure that your development environment fulfills the following requirements: Microsoft SQL Server 7.0 or 2000 (or Microsoft SQL Server 6.5 with Service Pack 2 or later) must be installed. At the time of publication, the T-SQL Debugger was not compatible with Desktop Engine (MSDE). Microsoft SQL Server must be running on Windows NT 4 Server or Windows 2000 Server or higher. Client-side tools must be installed on workstations with Windows 9x, Windows NT 4, or Windows 2000. You must have the Enterprise Edition of one Visual Studio development tool such as Visual Basic or Visual InterDev. Configuration The T-SQL Debugger is a complex tool that relies on the synchronous behavior of many components. Because all of these components are delivered with different versions of various programs, the biggest challenge that you face is to force all of these components to work together. You can achieve this end by following these configuration steps:
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