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One of the silliest things that programs do is exit when they could have continued working. It reminds me of when my family lived on the French Rivera, where it does not rain too often. Our two bulldogs were used to the nice weather, and at the slightest hint of moisture in the air, they would refuse to go outside. Our male dog Big Boss (Man) would stand in the doorway, stick his nose out slightly, and take a few deep breaths. If he sensed the slightest bit of moisture, instantly you were dragging an 80-pound concrete block. The point is that, like our bulldogs, programs sometimes overreact to situations. For fear of having problems or not doing something correctly, they instantly shut down. Let s say that you have a program that requires a configuration file to run. What happens when the configuration file does not exist One approach is to panic and exit. The panic approach will work, but what if multiple problems follow from the first one Then you are painstakingly hitting one error after another. Another approach is to use a default action. In this example, the default action could be to display a dialog box asking the user to select a configuration file, or the program could create a default file, as in this example: try { LoadConfiguration(); } catch(ConfigurationException ex) { CreateDefaultConfiguration(); }

SQL Server as well. The differences between SQL Server versions are reflected in details such as the maximum size for character data.

Note This exercise assumes that you have already completed the previous exercise and are starting with

To keep Table 4-1 short, under the Data Type heading we ve listed only the most frequently used types, while similar data types are explained under the Description and Notes heading. You don t need to memorize the list, but you should get an idea of which data types are available.

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Here, the LoadConfiguration() method is in a try/catch block, but the catch block catches only ConfigurationException failures (a built-in C# exception). If there is a ConfigurationException failure, then a default configuration is created. With a default configuration, the program can continue processing. Using the filtering capabilities of exceptions, if another exception is thrown in LoadConfiguration(), then some higher-level exception handler will process it. When processing an error that is a warning, the important steps are to filter for the specific exception and implement an appropriate exception handler that has been properly tested. Don t try to implement a fix-all exception handler, because you will never be able to implement a proper handler and thus will cause more problems. In the handler to fix the problem, make sure that you don t generate an exception. If you do, that exception will be sent to a higher method caller.

Stores whole numbers from 2,147,483,648 to 2,147,483,647. You ll use them for ID columns and in other circumstances that require integer numbers. Related types are SmallInt and TinyInt. A Bit data type is able to store values of 0 and 1. Stores monetary data with values from 263 to 263 1 with a precision of four decimal places. You ll use this data type to store product prices, shopping cart subtotals, and so on. SQL Server also supports the Float data type, which holds floating-point data, but Float is not recommended for storing monetary information because of its lack of precision. A variation of Money is SmallMoney, which has a smaller range, but the same precision. Supports date and time data from January 1, 1753 through December 31, 9999 with an accuracy of three hundredths of a second. A SmallDateTime type has a range from January 1, 1900 to June 6, 2079 with an accuracy of one minute. You ll use this data type to store information such as order shipping dates.

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