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numbers, because the correct interpretation of these characters depends on the value of a session parameter (NLS_NUMERIC_CHARACTERS), and there are some cultural differences in this area. In SQL, dates and time durations (intervals) are special cases. They are typically specified and represented as alphanumeric constants, but they need something else to distinguish them from regular strings. In other words, you must help the DBMS to interpret the strings correctly as date or time-interval constants. Probably the most straightforward (and elegant) method is to prefix the strings with a keyword (DATE, TIMESTAMP, or INTERVAL) and to adhere to a well-defined notation convention. (See the examples in Table 2-3 and the third option in the following list.) These are the three options to specify date and time-related constants in SQL: Specify them as alphanumeric constants (strings) and rely on implicit interpretation and conversion by the Oracle DBMS. This is dangerous, because things can go wrong if the actual format parameter for that session is different from the format of the string. Specify them as alphanumeric constants (strings) and use a CAST or TO_DATE conversion function to specify explicitly how the strings must be interpreted (see 5). Specify them as alphanumeric constants (strings), prefixed with DATE, TIMESTAMP, or INTERVAL. If you use INTERVAL, you also need a suffix to indicate a dimension, such as DAY, MONTH, or YEAR.

We want to get cracking with Catalyst, so this example of object-oriented programming with Moose is going to be fast-paced The documentation perldoc Moose::Cookbook::Basics:: Recipe1 provides a classic example of an object-oriented class to provide a way of representing a point: package Point; use Moose; has 'x' => (isa => 'Int', is => 'rw', required => 1); has 'y' => (isa => 'Int', is => 'rw', required => 1); sub clear { my $self = shift; $self->x(0); $self->y(0); } Let s get this going to see how it works First up, we ll make a proper distribution directory so we can pass this code around to our teammates easily or upload it to CPAN With Module::Starter installed, we can issue the following command: $ module-starter --mi --module=CrashCourse::Point \ --author="Me" --email=you@example.

Figure 6-18. You use this dialog of the E-Documents Import Wizard to inform Concordance if a series of files should be imported by their file type ( Import by file type ), or if you ll choose specific files ( Import specific files ).

Table 2-3 shows examples of using SQL constants. Table 2-3. Examples of SQL Constants (Literals)

com (Note the use of the \ character in the preceding line to break a long line of a shell command) Replace the name and e-mail address with your own This command creates a set of files and directories underneath the distribution root directory, which is called CrashCourse-Point We ll describe the structure of the files in this directory in the next chapter when we start programming Catalyst At the moment, we care about only two files (OK, maybe three): lib/CrashCourse/Pointpm t/00-loadt The third file is MakefilePL For the sake of completeness and of developing welldisciplined habits early, we should put the following on the line after build_requires 'Test::More';: requires 'Moose';.

42 8.75 8.75F 132 'JOneS' 'GEN' '132' DATE '2004-02-09' TIMESTAMP '2004-09-05 11.42.59.00000' INTERVAL '2' SECOND INTERVAL '1-3' YEAR TO MONTH

When you select the Import specific files radio button from the first dialog of the wizard and click the Next button, the File dialog is opened. This feature allows you to select specific files to be imported.

Note the subtle difference between 132 and '132'. The difference between numbers and strings becomes apparent when considering the operators they support. For example, numbers can be added or multiplied, but you cannot do that with strings. The only operator you can apply to strings is the concatenation operator. In general, the SQL language is case-insensitive. However, there is one important exception: alphanumeric constants (strings) are case-sensitive. For example, 'JOneS' is not equal to 'Jones'. This is sometimes the explanation of getting the message no rows selected in cases where you were expecting to see rows in the result.

This tells the build system that Moose is a dependency of this module. Now we can go into the file lib/CrashCourse/Point.pm and just delete everything in it and replace it with the following code: package CrashCourse::Point; use Moose; 1;