winforms qr code

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on and for convenience, when referring to the primary key, we ll be talking about the column that has the PRIMARY KEY constraint applied to it.

Sure, staples might be important, and maybe the company will not run as smoothly, but do you really want to inform the CEO about every little problem Microsoft developers know about this problem with parsing, and use an approach that you can use as well As you learned in 3, there are two variations of parsing a number: Parse() returns a valid number if the buffer could be parsed, and an exception if a number could not be parsed TryParse() returns a true or false value indicating the result of the parse Here s how you could rewrite the TestGetValue() method to use TryParse(): bool TestGetValue(string buffer, out int val) { bool retval = false; if (intTryParse(buffer, out val)) { retval = true; } return retval; }.

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Back to the example, setting the Name column as the primary key of the Department table would solve the problem because two departments would not be allowed to have the same name. If Name is the primary key of the Department table, searching for a row with a specific Name will always produce exactly one result if the name exists, or no results if no records have the specified name.

Tip This is common sense, but it has to be said: a primary key column will never accept NULL values.

Another solution is to use a command that reads the file and pipes the contents of the file to a stream. The console application reads the stream and processes the data. The following is an example of a command line that pipes data. The pipe operation is indicated by the pipe character (|). type lotto.txt | TextProcessor.exe In the example, the command type, which ordinarily reads a file and displays it on the console, reads in the lotto.txt file and pipes it to the console. Then TextProcessor.exe reads from the console, processes the data, and pipes it back to the console. For the scope of the TextProcessor application, the command lines listed in Table 10-1 are valid.

An alternative solution, and usually the preferred one, is to have an additional column in the table, called an ID column, to act as its primary key. With an ID column, the Department table would look like Figure 4-8.

TextProcessor.exe TextProcessor.exe [filename] TextProcessor.exe -out [filename] [filename] TextProcessor.exe -out [filename]

Figure 4-28. The completed Solver Parameters dialog box for the first weather problem Compare your results to Figure 4-29.

Figure 4-8. Adding an ID column as the primary key of Department The primary key column is named DepartmentID. We ll use the same naming convention for primary key columns in the other data tables we ll create. There are two main reasons why it s better to create a separate numerical primary key column than to use Name (or another existing column) as the primary key: Performance: The database engine handles sorting and searching operations much faster with numerical values than with strings. This becomes even more relevant in the context of working with multiple related tables that need to be frequently joined (you ll learn more about this in 5). Department name changes: If you need to rely on the ID value being stable in time, creating an artificial key (in the form of an additional ID column) solves the problem because it s unlikely you ll ever need to change the ID. In Figure 4-8, the primary key is composed of a single column, but this is not a requirement. If the primary key is composed of more than one column, the group of primary key columns (taken as a unit) is guaranteed to be unique (but the individual columns that form the primary key can have repeating values in the table). In 5, you ll see an example of a multivalued primary key. For now, it s enough to know that they exist.

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