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The package itself inherits from DBIx::Class::Schema, and makes one call: load_ namespaces. The default behavior of load_namespaces is to load all the files it finds in the Result and ResultSet namespaces under the namespace of the Schema itself. The ResultSet namespace is for custom methods, and we haven t made any of these yet, so next we ll look at the Result files.

dialog associated with your default printer (see Figure 10-1). Note that the precise type of dialog might vary according to the printer selected. Options available usually refer to the number of copies to print and the number of pages within the current document to print (range). Additional options are usually accessible from the Properties button located next to the selected printer combo box.

Figure 7-15. SQL Developer AUTOTRACE output From Figure 7-15, you can see that the optimizer decided to use the unique index E_PK for a range scan, and it chose to access the EMPLOYEES table using the row identifiers resulting from the index range scan. By choosing the Display Preference for V$MYSTAT, a list of performance-related statement execution statistics is captured and displayed beneath the execution plan. A detailed discussion of these statistics is not appropriate here, but you can see (for example) that no data was read from disk (physical reads) and six buffer cache block visits (consistent gets and db block gets) were needed.

Note If you use EXPLAIN, the SQL statement is not executed. This is because you ask for only an execution plan, not for statement results and not for execution statistics.

The Result files, as indicated previously, contain the information about our database. Each Result file, called a Result class, represents a single result row of a query based on the table it describes. The Users Result class starts like this: package Auth::Schema::Result::Users; use strict; use warnings; use base 'DBIx::Class'; __PACKAGE__->load_components("InflateColumn::DateTime", "Core"); __PACKAGE__->table("users"); Inheriting from DBIx::Class gives it the ability to load components. The main component, which is always needed for a table result class, is Core. The helper also adds the InflateColumn:: DateTime component. We will look at this and some other useful components later. The table call sets the name of the table DBIx::Class should use to make queries on based on this class. After the table, the available columns are described: __PACKAGE__->add_columns( "id", { data_type => "INTEGER", is_nullable => 0, size => undef, is_auto_increment => 1 }, "username", { data_type => "TEXT", is_nullable => 0, size => undef }, "email", { data_type => "TEXT", is_nullable => 0, size => undef }, "password", { data_type => "TEXT", is_nullable => 0, size => undef }, ); Each column is listed, together with a hashref of column_info about the column. This is mainly used by the deployment code of the DBIx::Class, when creating new database tables based on the Schema. It is also useful to remind developers what sorts of data the database columns may contain, especially if someone else is maintaining the database. See the Deploying to a Different Database System section later on in this chapter for how to create tables in another database using this information. Download at

Figure 10-1. An example of a printer dialog. This particular dialog is specific to the printer attached to a user s computer. In this example, the dialog pertains to an HP OfficeJet V40 printer.