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Database applications are application programs that use an underlying database to store their data. Examples of such database applications are screen- and menu-driven data-entry programs, spreadsheets, report generators, and so on. Database applications are often developed using development tools from the DBMS vendor. In fact, most of these development tools can be considered to be database applications themselves, because they typically use the database not only to store regular data, but also to store their application specifications. For example, consider tools such as Oracle JDeveloper and Oracle Application Express. With these examples we are entering the relational world, which is introduced in the next section.

In this section, the following terms were introduced: Database Database management system (DBMS) Kernel

Remember, if you experience any problems installing CPAN modules, then it s likely that you ll have to move over to the CPAN shell to investigate any failing modules. Once you ve run make installdeps, run make realclean to remove the generated Makefile.PL.

Relational Operators Ten relational operators in Concordance allow for evaluating and comparing fielded data. Most of these relational operators have both a symbolic representation (for example, < for less than ) and a two-letter abbreviation that s exactly equivalent to the symbolic representation (for example, LT for less than). Take the following search: CDATE < "1/1/2003" It s the same as this one: CDATE LT "1/1/2003" To search for the two-character abbreviation as a search term; for example, documents that contain the actual characters LT, use double quotes to enclose the search term. For example, the following syntax forces Concordance to use LT as a search term, not as the operator less than : TITLE CO "LT" Table 9-2 lists the relational operators and their abbreviations. Table 9-2. Relational Search Operators, Symbols, and Abbreviations

The theoretical foundation for a relational database management system (RDBMS) was laid out in 1970 by Ted Codd in his famous article A Relational Model of Data for Large Shared Data Banks (Codd, 1970). He derived his revolutionary ideas from classical components of mathematics: set theory, relational calculus, and relational algebra. About ten years after Ted Codd published his article, around 1980, the first RDBMS systems (Relational DBMS systems) aiming to translate Ted Codd s ideas into real products became commercially available. Among the first pioneering RDBMS vendors were Oracle and Ingres, followed a few years later by IBM with SQL/DS and DB2. We won t go into great detail about this formal foundation for relational databases, but we do need to review the basics in order to explain the term relational. The essence of Ted Codd s ideas was two main requirements: Clearly distinguish the logical task (the what) from the physical task (the how) both while designing, developing, and using databases. Make sure that an RDBMS implementation fully takes care of the physical task, so the system users need to worry only about executing the logical task.

PAR (which stands for Perl Archive (PAR) is a useful way of bundling your application and all its dependencies and distributing it as either a .par archive or a binary executable. Starting with a fresh application, here s how to make the .par file: catalyst.pl MyApp cd MyApp perl Makefile.PL make catalyst_par This will create the file MyApp.par, which we can run on another system using the same version of perl. Note that if any modules containing C code are in the archive, the other system needs to be binary compatible. You could run the development server off this PAR with the following command: perl MPAR=/path/to/MyApp.par script_myapp_server.pl

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