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The Concordance Programming Language (CPL) was created specifically for the purpose of augmenting Concordance s native functionality. CPL programs can perform useful procedures not otherwise available from the tools that can be opened and invoked from within Concordance, or you can use the CPL programs to automate existing Concordance procedures. During installation, Concordance creates several CPL programs, and places them in a folder named CPL off the main installation directory. These programs have been written and tested by the manufacturer, and can be quite useful to an administrator. Other CPLs are available for download from the CPL Library section on Dataflight s Web site at http://www. dataflight.com/cpl.library.html. Programs in the library are grouped according to their use: Administration, Import/Export, Printing, and so on (see Figure 7-13). Programs written in CPL can have a .CPL extension, and are ASCII text. They can be opened by a text editor, or opened by Concordance from the File Edit Program menu. When you use this menu item to open a CPL program, you re prompted for the program s location. When you select it, Concordance opens the program in its own simple text editor (see Figure 7-14).

quickly rig up automated tests for your application (although if your application is JavaScript dependent, HTTP::Recorder won t work very well). We don t use Test::WWW::Mechanize::Catalyst in the automated testing section for many applications in this book, but it is a useful choice.

Compound conditions consist of multiple subconditions, combined with logical operators. In Section 4.5 of this chapter, you will see how to construct compound conditions by using the logical operators AND, OR, and NOT.

CPL programs can also have a .CPT extension. .CPT program files are created the first time Concordance successfully runs a program with a .CPL extension. A .CPT program file is a compiled equivalent to a .CPL file, and runs more efficiently because it has been converted to machine code. Note that if a .CPL file contains a programming error so that it cannot run to completion, Concordance will be unable to compile the file into a .CPT equivalent. CPL programs can perform a variety of useful procedures. A sampling of CPL programs available at Dataflight s CPL Library include the following: Indxpack.cpl: Indexes and then packs a database. Userid.cpl: Displays a user s network login. Send-to-Excel.cpl: Sends data from the last active query to an Excel file. Calender.cpl: Displays a calendar. Can be used to augment other CPL programs.

The result of a query is a table; that is, a set of rows. The order in which these rows appear in the result typically depends on two aspects: The strategy chosen by the optimizer to access the data The operations chosen by the optimizer to produce the desired result

The script/lolcatalyst_lite_test.pl script will test individual pages of our application from the command line. Because our application shows only interesting behavior on a successful POST request, this is of limited use to us for the time being. However, it is worth noting that issuing the following command: script/lolcatalyst_lite_test.pl / will print out the HTML for the form we just wrote, as well as the debug information.

A complete discussion of CPL structure exceeds the scope of this book, as it s a full-fledged programming language. However, you should know that CPL programs are divided into functions, where a function is a series of programming lines. Functions can perform many tasks, such as executing other functions, performing calculations, activating features otherwise accessible from Concordance s menu items, modifying data in a database, or providing a user with feedback. Sometimes all these actions are executed from within a single function. Programmers define one function within a CPL program to be the main or entry function. Such a function is the first set of code to be run in a program, and it often does most of the work, calling other functions in the program to perform related tasks. Recall in the section Adding Custom Menu Items that the Added Menu Items dialog has a File text field that you can use to link a CPL program to a menu item. You can use the Function text field in this dialog to call a function from within the CPL program file referenced in the File text field. The function that s called doesn t have to be a CPL s entry function; it may be a function that tests some condition that must be met before the CPL is run.

This means that it is sometimes difficult to predict the order of the rows in the result. In any case, the order is not guaranteed to be the same under all circumstances. If you insist on getting the resulting rows of your query back in a guaranteed order, you must use the ORDER BY clause in your SELECT commands. Figure 4-2 shows the syntax of this clause.