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ADD_MONTHS_1 ADD_MONTHS_2 ADD_MONTHS_3 ------------ ------------ -----------29-FEB-1996 28-FEB-1997 11-MAY-1997 Notice what happens in Listing 5-20 with a non-leap year. There is something else worth noting about the query in Listing 5-20. As explained earlier, you could get back an error message because you rely on implicit interpretation and conversion of the three strings by Oracle. It would have been preferable to specify the three date literals in Listing 5-20 using the key word DATE (see the beginning of this section) or using the TO_DATE conversion function. (See Section 5.7 later in this chapter for details about conversion functions.)

You can use Opticon as a standalone program to view images. The File Open Image menu or the Ctrl+O keystroke combination opens an Open dialog. Double-clicking a file name, or highlighting it and clicking the Open button, opens the image.

Listing 5-21 shows examples of using the date functions NEXT_DAY, LAST_DAY, ROUND, and TRUNC. Compare the various function results with the first column, showing the current SYSDATE value. Listing 5-21. Using the NEXT_DAY, LAST_DAY, ROUND, and TRUNC Functions select , , , , from sysdate next_day(sysdate,'SAT') last_day(sysdate) round(sysdate,'YY') trunc(sysdate,'CC') dual; as as as as next_sat last_day round_yy trunc_cc

Again, it doesn t get much simpler than that Now we add the access_denied action to lib/ SneakyCat/Controller/Ideaspm: sub access_denied :Local :Args(0) { my ( $self, $c ) = @_; $c->stash->{'template'} = 'ideas/accessdeniedtt'; ## tell the user SneakyCat is ignoring them $c->stash( message => "SneakyCat has ideas of his own and is ignoring you" ); You might be wondering why we go through all this trouble simply to show an access denied message The reason is simple: in a real-world web application, you almost always want to do something additional when a user tries to do something he is not allowed to do If you are writing a back-office application, for example, you probably want to log that someone tried to do something he wasn t supposed to.

For end users working with Concordance databases, a much more common method of opening Opticon is to launch it from Concordance using the Camera button located on the button bar at the bottom of the Concordance screen when any one of the Browse, Edit, or Table views are active. Opticon launches and displays the first image associated with a document record if the following conditions are met: Opticon is configured as the database s image viewer. The Concordance database has one field that s set as an image key. If no field is set, the error message displayed in Figure 12-8 is displayed. The Opticon imagebase associated with the Concordance database has an entry that matches the image key field value of the currently active record. If no match is found, the error message shown in Figure 12-9 is displayed.

SYSDATE NEXT_SAT LAST_DAY ROUND_YY TRUNC_CC ----------- ----------- ----------- ----------- ----------17-AUG-2009 22-AUG-2009 31-AUG-2009 01-JAN-2010 01-JAN-2001

If you are writing a public, user-facing application, you might want to attempt an upsell to give the user access to the feature he was trying to use In other situations, you probably want to send a note to the debug log indicating that the user got to a section of the site he shouldn t have been able to see Getting back to our roles discussion, like the $c->user_exists() call, the $c->check_user_ roles() call can be and often is made from within a template Again, the most common occurrence is when building navigation to indicate the actions the user is allowed to take Let s modify our navigation in root/lib/site/wrapper to take into account our permissions check: <div id="navbar"> <a href="[% curi_for('/ideas/share') %]">Home</a> [% IF cuser_exists() %] [% IF ccheck_user_roles( 'can_whisper' ) %] <a href="[% curi_for('/ideas/whisper') %]">Tell</a> [% END %] <a href="[% c.

The most important general (datatype-independent) functions are shown in Table 5-10.

Figure 12-8. If a database has no image key, this error message is displayed when you click the Camera button.

GREATEST(a, b, ...) LEAST(a, b, ...) NULLIF(a, b) COALESCE(a, b, ...) NVL(x, y) NVL2(x, y, z) CASE x when a1 then b1 when a2 then b2 ... else y end DECODE(x, a1, b1, a2, b2, , an, bn [, y])