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Concordance fully automates the indexing procedure, though you must initially trigger it from the File Index menu item. When an index is triggered, Concordance builds lists of all words contained in paragraph fields (and other fields with their index attribute set to True). These lists enable Concordance s full-text searching capabilities. Reindexing is the same as indexing, though it s invoked when data in a Concordance database is updated or when new records have been loaded. When data in a Concordance database changes, you must update the files that enable full-text searching, the dictionary file (which contains a list of all unique words), and the inverted text file (which contains the placement and frequency of words in the dictionary file) via reindexing. You must knowingly trigger reindexing. The File menu provides a visual cue. If the Reindex submenu item has a check mark next to it, the database requires reindexing.

Not that useful by itself. However, we can interrogate the $c object quite effectively: $ $c->action $Catalyst_Action1 = index; To get a dump of the action, we need to write some Perl: $ use YAML; $ Dump $c->action --- !!perl/hash:Catalyst::Action attributes: Args: - 0 Path: - '' class: MyApp::Controller::Root code: !!perl/code '{ "DUMMY" }' name: index namespace: '' reverse: index Something REPL doesn t provide for you that the Perl debugger does is the ability to add breakpoints during a session. However, if we have code that throws an error, REPL will stop at the error. So we can replace our original die "Error! "; statement with the following: $c->model('Wrong')->explode; Now if we run the code with the CATALYST_REPL environment variable enabled, we ll drop to REPL until we either fix the syntax error or create the Catalyst model None with the method do_something.

is logically equivalent with the following iterated AND condition: 2 3 4 5 where AND AND AND evaluation evaluation evaluation evaluation <> <> <> <> 1 2 3 NULL

In addition to any folder- or file-level permissions enforced on a network, a secondary layer of security is available in Concordance s own security model. This security model allows you to create users and define roles for them. It isn t applied by default. You must actively enforce it after the database is created. Security in a Concordance database is twofold: restricting users from modifying, viewing, or searching specific fields, and restricting access to menu items. Security is specific to each instance of a Concordance database, so that user security modified in one database doesn t cascade to other databases. You must modify user permissions for each database, in each database.

If you consider a row with an EVALUATION value of 1, 2, or 3, it is obvious that out of the first three conditions, one of them returns FALSE, and the other two return TRUE. Therefore, the complete WHERE clause returns FALSE. If the EVALUATION value is NULL, all four conditions return UNKNOWN. Therefore, the end result is also UNKNOWN. So far, there are no surprises. If the EVALUATION value is 4 or 5 (the remaining two allowed values), the first three conditions all return TRUE, but the last condition returns UNKNOWN. So you have the following expression: (TRUE) and (TRUE) and (TRUE) and (UNKNOWN) This is logically equivalent with UNKNOWN, so the complete WHERE clause returns UNKNOWN. 15. At the end of Section 4.5, you saw the following statement. The following two queries are logically equivalent: select * from employees where NOT (ename = 'BLAKE' AND init = 'R') select * from employees where ename <> 'BLAKE' OR init <> 'R' Prove this, using a truth table. Answer: First, we assign names to the two WHERE clause components. Let s represent ename = 'BLAKE' with P. Let s represent init = 'R' with Q.

Refer to the documentation for CatalystX::REPL, Carp::REPL (upon which CatalystX::REPL is based), and Devel::REPL. For usage of the Perl debugger, see perldoc perldebug. For running Catalyst applications under the Perl debugger, the $DB::single=1 statement (documented in perldebug) is particularly useful.