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The database is set up, so we can now start looking at how to get data from our database into our application. To use DBIx::Class, you need to understand resultsets. A basic resultset is returned from Catalyst s $c->model call. To obtain this, we pass it the namespace of the Catalyst model and then the name of the Result class we want to use prepended with a double colon. my $users_rs = $c->model('AuthDB::Users'); This is an alternative to more unwieldy syntax: $c->model('AuthDB')->resultset('Users'); The resultset, which inherits from DBIx::Class::ResultSet, is used for creating, finding, updating, and deleting rows in the database. Single row objects can be retrieved by finding or searching for them. Row objects will inherit from DBIx::Class::Row as well as the Result class for the particular table the row was retrieved from. Creating a resultset runs no queries on the database; it just stores a query ready for use.

By default, the Standard button bar is docked to the upper edge of the Opticon screen, just below menu items. Table 12-1 explains the functions of buttons on the Standard toolbar that pertain to image appearance. These buttons can complement the View and Tools menu options described earlier. Table 12-1. Buttons on the Standard Toolbar

Each row e is checked against the WHERE clause, and it is passed to an intermediate result set if the WHERE clause evaluates to TRUE. For each row in the intermediate result set, the expressions in the SELECT clause are evaluated to produce the final query result.

Figure 8-2. Calendar with sliding day indicator window As long as you are writing simple queries (as we have done so far in this book), you don t need to worry about tuple variables. The Oracle DBMS understands your SQL intentions anyway. However, as soon as your SQL statements become more complicated, it might be wise (or even mandatory) to start using tuple variables. Tuple variables always have at least one advantage: they enhance the readability and maintainability of your SQL code.

available You can see this type of access in our SneakyCat application when we are storing a new piece of data and we want to retain who added it: ## in the Ideas controller sub whisper :Local :Args(0) { ## .. $c->model('Ideas')->create( { text => $c->req->params->{'whisper'}, secret => $c->req->params->{'secret'}, added_by => $c->user->get('username'), added => $current_time } ); ## .. } It is important to be aware that $c->user is the Catalyst authentication system s concept of a user It is built to function within the authentication system and to allow basic retrieval of the user s data You can access this user data by calling $c->user->get('fieldname'), which will retrieve fieldname from the user object and return its value If all you need is to read the fields, this is the best way to work with authenticated user data.