FAQ
Dear DBI users,

This is to announce yet another wrapper module on top of DBI, just posted
on CPAN. Please have a look and see whether it can help suit your needs.
The discussion forum is on http://www.cpanforum.com/.

Below is an excerpt from the doc :

DBIx::DataModel is written compactly as one single module, and only
depends on DBI and the SQL::Abstract manpage. It is intended to help
client applications in performing common tasks such as data conversion and
associations between tables, while retaining an open access both to the
base DBI layer and to the basic Perl datastructures, whenever lower-level
operations are needed. The focus is on building trees of data which can
then be passed to external helper modules for generating XML, Perl dumps,
javascript JSON, templates of the Template Toolkit, etc. Such modules need
to walk on the data tree, so they cannot work if everything is implemented
as OO methods to be called on demand (because there is no simple way to
ask for all available methods, and even if you get there, it is not
possible to distinguish which of those methods encapsulate relevant data).
Therefore DBIx::DataModel does not insist on OO information hiding; on the
contrary, direct access to the object hash is encouraged for inspecting
the data. In the same spirit, transaction handling is left to the client
code.

DBIx::DataModel defines an API for accessing the database from Perl, but
will not create the database itself. So use your best database
administration tools to define your schemas, tables, keys, relationships
and integrity rules; then tell the bare minimum to DBIx::DataModel so that
Perl programs can work with the data. To do so, you first declare your
tables with their primary keys. Then you declare UML binary associations,
which will give you a couple of methods to walk through the data, possibly
with some additional WHERE filters. From your associations, you can also
generate some Views to directly query a list of tables, with the
appropriate joins between them. At each method call, it is possible to
specify which subset of columns should be retrieved (or to rely on the
default, namely '*').

Columns may have some associated handlers for performing data
transformation of validation. You may also define column types in your
schema so that every column of a given type inherits the same collection
of handlers (think for example of a 'date' type or a 'phoneNumber' type).

Search Discussions

Related Discussions

Discussion Navigation
viewthread | post
Discussion Overview
groupdbi-users @
categoriesperl
postedSep 19, '05 at 7:01a
activeSep 19, '05 at 7:01a
posts1
users1
websitedbi.perl.org

People

Translate

site design / logo © 2022 Grokbase