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How can you fix it 4. How do the Rollback Transaction and Commit Transaction statements affect @@trancount 5. Create a table with bank account information and then a stored procedure for transferring funds from one account to another. The stored procedure should contain transaction processing. 6. Is it okay to span transaction over multiple batches
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ebugging and error handling seem like such negative topics. By admitting debugging as a necessary phase of development and error handling as a required practice, we seem to admit to weakness in our abilities as developers. But we are not the computers themselves: we cannot account for all contingencies when we write code. So, to find the error of our ways after the fact, we need a coherent approach to the identification and resolution of defects in our code and a coherent strategy for handling errors in our code as they occur.
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The process of debugging is an integral part of both the development and stabilization phases of software production.
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You have probably heard errors and defects found in software referred to as bugs. This word has found its way into our everyday language and reality so that we now seem to regard the bug as normal and inevitable like death and taxes. However, not many people know how this term actually entered the language. It happened in the dim, distant technological past when computers occupied whole rooms (if not buildings). On one occasion, technicians were investigating a malfunction on such a computer. Much to their surprise, they found the cause of the circuit malfunction to be a large moth that had been attracted by the heat and glow of the machine s vacuum tubes. Over time, all computer-related errors (particularly the ones that were difficult to explain) came to be known as bugs. Sometimes we anthropomorphize bugs give them human attributes. They can seem in turn capricious and malicious, but the bugs we experience in application and database development are not related to mythological folk such as gremlins. Bugs are very real, but their causes are inevitably human. Computers bear no malice toward users or developers, compilers do not play practical jokes, and operating systems are not being stubborn when they refuse to operate as expected. No, when you encounter an error, you can be
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7:
Debugging and Error Handling
sure that it was you or another programmer who caused it. What you need to do is find the offending code and fix it, but to find bugs efficiently and painlessly, you need to establish a debugging process a formal routine with well-defined steps and rules.
The Debugging Process
The objectives of the debugging process are to identify and resolve the defects present in a software product. This process consists of two phases: 1. Identification 2. Resolution
Identification
The identification phase consists of two primary activities: 1. Stabilize the error. 2. Find the source of the error. 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, we can go on to answer the question, Why does the error occur
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