Страницы справочника OS X

Эта страница руководства для  версии 10.9 Mac OS X

Читать страницы руководства

DBD::Gofer::Policy::Base(3)          User Contributed Perl Documentation         DBD::Gofer::Policy::Base(3)



NAME
       DBD::Gofer::Policy::Base - Base class for DBD::Gofer policies

SYNOPSIS
         $dbh = DBI->connect("dbi:Gofer:transport=...;policy=...", ...)

DESCRIPTION
       DBD::Gofer can be configured via a 'policy' mechanism that allows you to fine-tune the number of
       round-trips to the Gofer server.  The policies are grouped into classes (which may be subclassed) and
       referenced by the name of the class.

       The DBD::Gofer::Policy::Base class is the base class for all the policy classes and describes all the
       individual policy items.

       The Base policy is not used directly. You should use a policy class derived from it.

POLICY CLASSES
       Three policy classes are supplied with DBD::Gofer:

       DBD::Gofer::Policy::pedantic is most 'transparent' but slowest because it makes more  round-trips to
       the Gofer server.

       DBD::Gofer::Policy::classic is a reasonable compromise - it's the default policy.

       DBD::Gofer::Policy::rush is fastest, but may require code changes in your applications.

       Generally the default "classic" policy is fine. When first testing an existing application with Gofer
       it is a good idea to start with the "pedantic" policy first and then switch to "classic" or a custom
       policy, for final testing.

POLICY ITEMS
       These are temporary docs: See the source code for list of policies and their defaults.

       In a future version the policies and their defaults will be defined in the pod and parsed out at
       load-time.

       See the source code to this module for more details.

POLICY CUSTOMIZATION
       XXX This area of DBD::Gofer is subject to change.

       There are three ways to customize policies:

       Policy classes are designed to influence the overall behaviour of DBD::Gofer with existing, unaltered
       programs, so they work in a reasonably optimal way without requiring code changes. You can implement
       new policy classes as subclasses of existing policies.

       In many cases individual policy items can be overridden on a case-by-case basis within your
       application code. You do this by passing a corresponding "<go_<policy_name">> attribute into DBI
       methods by your application code.  This let's you fine-tune the behaviour for special cases.

       The policy items are implemented as methods. In many cases the methods are passed parameters relating
       to the DBD::Gofer code being executed. This means the policy can implement dynamic behaviour that
       varies depending on the particular circumstances, such as the particular statement being executed.

AUTHOR
       Tim Bunce, <http://www.tim.bunce.name>

LICENCE AND COPYRIGHT
       Copyright (c) 2007, Tim Bunce, Ireland. All rights reserved.

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl
       itself. See perlartistic.



perl v5.16.2                                     2007-10-16                      DBD::Gofer::Policy::Base(3)