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Because Concordance databases usually involve a dynamic set of underlying data and a dynamic set of users, you ll find that you must interact with databases on a frequent basis to keep them operating at peak efficiency. In this chapter, some basic administrative functions were described: indexing and packing databases, deduplicating records, applying security and concatenating databases, creating custom menu items, and running CPL programs. Although the descriptions in this chapter will give you some insight as to how a Concordance database should be administered, there s no better way to learn than by doing. I recommend that you create test databases and practice the various administrative techniques described in this chapter. At this point, you should have a good grasp of how databases are created, designed, and deployed. s thus far haven t delved too deeply into how you and end users actually use a database, though. The next chapter addresses just that. Among other things, it covers how to view, sort, and edit records, and how to group them using document-level tags. The chapter also introduces the important concept of document annotations subjective comments created by end users to qualify the data presented to them by Concordance.

You can use views for many different purposes. This section lists and explains the most important ones: to simplify database retrieval, to maintain logical data independence, and to implement data security.

DB<2> p $response->content {"current_view":"Service","template":"index.tt","lol":"Can i have a cheese burger ","result":"I CAN HAZ CHEEZ BURGR "} DB<3> c ok 11 - Translation request successful 2xx ok 12 - JSON content type ok 13 - contains translated string Debugged program terminated. Use q to quit or R to restart, use O inhibit_exit to avoid stopping after program termination, h q, h R or h O to get additional info. DB<3>q

his chapter will cover the basic usage of a Concordance database, such as opening a database, viewing and navigating through records using Concordance s Browse and Table views, editing data, using document-level tags, and adding annotations (you ll learn about advanced searching in 9). Both you, as an administrator, and end users will find these functions useful. The purpose of this chapter is to give you a detailed understanding of how to use a Concordance database to view and manipulate document records.

Views can simplify database retrieval significantly. You can build up (and test) complex queries step by step, for more control over the correctness of your queries. In other words, you will be more confident that your queries return the right results. You can also store (hide) frequently recurring standard queries in a view definition, thus reducing the number of unnecessary mistakes. For example, you might define views based on frequently joined tables, UNION constructs, or complex GROUP BY statements. Suppose we are interested in an overview showing all employees who have attended more course days than the average employee. This is not a trivial query, so let s tackle it in multiple phases. As a first step toward the final solution, we ask the question, How many course days did everyone attend The query in Listing 10-7 provides the answer.

In this example, you can see that the OR operator in SQL is inclusive; otherwise, the third row wouldn t show up in the result. The XML course belongs to the BLD course category (so the first condition evaluates to TRUE) and its duration is two days (so the second condition also evaluates to TRUE). Another point of note regarding the evaluation order for an OR operator is that conditions are evaluated in order until a TRUE condition is found. All subsequent conditions are ignored. This is due to the fact that for an OR operator to be satisfied, only one condition must evaluate to TRUE. So, even if you had many OR conditions, evaluation will stop as soon as the first TRUE occurs. In the upcoming discussion of the NOT operator, you will see how to construct an exclusive OR.

You can programmatically add debugger break points into your Catalyst application by adding the Tip code $DB::single=1; to where you want the debugger to stop. If you then run your tests using perl Ilib d t/test_file.t, execution will stop in the middle of your request so that you can inspect the data for debugging purposes.