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Figure 6-22. An example of the full text that s extracted from an electronic file that has no actual searchable text. In this example, a .TIF image was imported. The binary format of the file is translated into indecipherable characters in Concordance.

The comparison operators allow you to formulate conditions in SQL. Table 2-6 shows the comparison operators available in SQL.

[% IF ! c.user_exists %] <form action="[% c.uri_for('/people/login') %]" method="post" accept-charset="utf-8"> <label for="username">Username</label> <input type="text" name="username" value="" id="username"/> <br/><br/> <label for="password">Password</label> <input type="password" name="password" value="" id="password"/> <p><input type="submit" value="Login →"></p> </form> [% ELSE %] <p>You are already logged in.</p> [% END %] We will place this code in a file called root/src/people/login.tt. Again, the path is important. We configured our TT view to expect to find its templates in root/src. When we create a template for an action, our view expects to find it in a directory named after the controller it is in, in this case People. It then uses the action name, in this case login, and appends .tt to it to find the appropriate template. Stringing all of those together we get root/src/people/login.tt. While the preceding logic works in most cases, it should be noted that the template chosen is based on the original action requested. This means that if your system calls $c->forward(...) or $c->detach(...), or otherwise triggers a different action than the one originally requested, the wrong template may be chosen. For this reason, it is a good idea to always explicitly define what template you want to use rather than relying on the built-in logic. You can do this easily by placing the directory and filename in $c->stash->{'template'}. We will do this in all of our actions going forward. Now that we have our form, we can proceed to our login action. We will place our login action in lib/SneakyCat/Controller/People.pm: sub login :Local :Args(0) { my ( $self, $c ) = @_; $c->stash->{'template'} = 'people/login.tt'; if ( exists($c->req->params->{'username'}) ) { if ($c->authenticate( { username => $c->req->params->{'username'}, password => $c->req->params->{'password'} }) ) { ## user is signed in $c->stash->{'message'} = "You are now logged in."; $c->response->redirect( $c->uri_for($c->controller('Ideas')->action_for('share') ) ); $c->detach(); return; }

When you re satisfied with your selections, clicking the Accept button saves the updated list and closes the dialog. The Quit button closes the dialog without saving updates. Import Selected Extensions The other option available from the File types dialog gives you the ability to select file extensions from a list. Items that have a check mark will be imported. You can add additional file types from the text field in the lower left-hand corner of the dialog, and by clicking the

< > = <= >= <> or !=

Expressions with comparison operators are also referred to as predicates or Boolean expressions. These expressions evaluate to TRUE or FALSE. Sometimes, the outcome is UNKNOWN, such as when you have rows with missing information. We will revisit this topic in more detail in 4, when we discuss null values.

else { $c->stash->{'message'} = "Invalid login"; } } } This routine is fairly straightforward It s a combination form display and submit action, and it decides what to do based on whether a username parameter was provided If it was, the action calls $c->authenticate() with the username and password as provided from the web browser If the call succeeds, it will return true, and you can perform actions based on successful authentication In this case, we set a nice logged in message and redirect users to the idea-sharing page If the call fails, it returns false and we set an invalid login message to be displayed on the page, where we display the form again While the function of the authenticate call is fairly obvious, there is something about it that is not obvious: every field provided is being passed directly to the database for retrieval.