RoPkg::DBCollection(3pm)

User Contributed Perl Documentation

RoPkg::DBCollection(3pm)

NAME¶

RoPkg::DBCollection - base class who can be used for collections of database objects

VERSION¶

0.1.3

DESCRIPTION¶

RoPkg::DBCollection is a class who can be used as a base class for database collection of objects. Is used by RoPkg::Simba::Mirrors ,RoPkg::Simba::Commands and RoPkg::Simba::Excludes. This class should not be used directly in applications but derived.

SUBROUTINES/METHODS¶

new()¶

The class constructor. Accepts a hash with parameters. The parameters who can be passed to new() are:

dbo - database object (instance of RoPkg::DB)
dbo_method - database method (for use with RoPkg::DB)
table - the sql table name where the objects data can be found

If you don't specify the dbo and dbo_method parameters, a Param::Missing exception is raised.

dbh()¶

returns the database handler (DBI object) used by the class.

_count($fields)¶

Returns the number of records who match the fields specified in $fields. This method should be overriden by the child classes. The $fields must me specified in SQL::Abstract format. Please refer to the SQL::Abstract documentation for more details about $fields format.

_get($class_name, $fields, $order_by)¶

Returns a array of initialized objects. The values are read from the database. $class_name is the name of the class who's gonna be instanciated. When creating the class instance dbo and dbo_method parameters are passed to the new() method. The records from the database must match the $fields parameter and the order is given by $order_by. For more details of these 2 parameters please refer to SQL::Abstract documentation.
Exceptions throwed:

Param::Missing - when $class_name has not been specified
Param::Wrong - when $class_name is not a class name
DB::NoResults - when the query returned 0 results

SYNOPSIS¶

 package RoPkg::Tester;
 
 use strict;
 use warnings;
 
 use Scalar::Util qw(blessed);
 use RoPkg::Exceptions;
 use RoPkg::DBCollection;
 use vars qw(@ISA);
 @ISA=qw(RoPkg::DBCollection);
 sub new {
   my ($class, %opt) = @_;
   my $self;
 
   $self = $class->SUPER::new(%opt);
   $self->{table} = 'Mirrors';
 
   return $self;
 }
 
 sub Count {
   my ($self) = @_;
 
   if (!blessed($self)) {
     OutsideClass->throw(
       error    => 'Called outside class instance',
       pkg_name => 'RoPkg::Tester',
     );
   }
 
   return $self->_count();
 }
 
 sub Get {
   my ($self, $fields) = @_;
 
   if (!blessed($self)) {
     OutsideClass->throw(
       error    => 'Called outside class instance',
       pkg_name => 'RoPkg::Tester'
     );
   }
 
   return $self->_get('RoPkg::Simba::Mirror');
 }
 1;
 sub main {
   my ($dbc, $dbp);
 
   $dbp = new RoPkg::DB();
   $dbp->Add(
           'dbi:mysql:database=mirrors_db;host=localhost',
           'root',
           '',
           'mirrors'
         );
   
   $dbc = new RoPkg::Tester(
            dbo => $dbp,
            dbo_method => 'db_mirrors'
          );
 
   print $dbc->Count(),$/;
   
   my @mirrors = $dbc->Get();
 }
 
 main();

DIAGNOSTICS¶

This module comes with tests. To run them, unpack the source and use 'make test' command.

PERL CRITIC¶

This modules is perlcritic level 2 compliant (with 1 exception)

CONFIGURATION AND ENVIRONMENT¶

This module does not use any configuration files or environment variables. However, it is possible that some dependencies to do so. Please read the man page of each dependency to find out more information.

DEPENDENCIES¶

This module use the following modules:

*) SQL::Abstract
*) DBI
*) Scalar::Util
*) RoPkg

INCOMPATIBILITIES¶

None known to the author

BUGS AND LIMITATIONS¶