NAME
CGI::Session::Driver::pure_sql - Pure SQL driver with no embedded Perl
stored in the database
SYNOPSIS
use CGI::Session::Driver::pure_sql;
$session = CGI::Session->new("driver:pure_sql;serializer:sql_abstract", undef, {Handle=>$dbh});
For more examples, consult CGI::Session manual
DESCRIPTION
*Disclaimer* While this software is complete and includes a working test
suite, I'm marking it as a development release to leave room for
feedback on the interface. Until that happens, it's possible I may make
changes that aren't backwards compatible. You can help things along by
communicating by providing feedback about the module yourself.
CGI::Session::Driver::pure_sql is a CGI::Session driver to store session
data in a SQL table. Unlike the "CGI::Session::Driver::postgresql"
driver, this "pure SQL" driver does not serialize any Perl data
structures to the database.
The means that you can access all the data in the session easily using
standard SQL syntax.
The downside side is that you have create the columns for any data you
want to store, and each field will have just one value: You can't store
arbitrary data like you can with the CGI::Session::Driver::postgresql
driver. However, you may already be in the habit of writing applications
which use standard SQL structures, so this may not be much of a
drawback. :)
It currently requires the sql_abstract serializer to work, which is
included in the distribution.
STORAGE
To store session data in SQL database, you first need to create a
suitable table for it with the following command:
-- This syntax for for Postgres; flavor to taste
CREATE TABLE sessions (
session_id CHAR(32) NOT NULL,
remote_addr inet,
creation_time timestamp,
last_access_time timestamp,
duration interval
);
You can also add any number of additional columns to the table, but the
above fields are required.
For any additional columns you add, if you would like to expire that
column individually, you need to an additional column to do that. For
example, to add a column named "order_id" which you want to allow to be
expired, you would add these two columns:
order_id int,
order_id_exp_secs int,
If you want to store the session data in other table than "sessions",
you will also need to specify TableName attribute as the first argument
to new():
use CGI::Session;
$session = CGI::Session->new("driver:pure_sql;serializer:sql_abstract", undef,
{Handle=>$dbh, TableName=>'my_sessions'});
Every write access to session records is done through PostgreSQL own row
locking mechanism, enabled by `FOR UPDATE' clauses in SELECTs or
implicitly enabled in UPDATEs and DELETEs.
To write your own drivers for CGI::Session refere CGI::Session manual.
COPYRIGHT
Copyright (C) 2003-2010 Mark Stosberg. All rights reserved.
This library is free software and can be modified and distributed under
the same terms as Perl itself.
CONTRIBUTING
Patches, questions and feedback are welcome. Please use the bug tracker
to submit bugs and patches, and e-mail directly with questions and
feedback.
https://rt.cpan.org/Public/Dist/Display.html?Name=CGI-Session-Driver-pur
e_sql
AUTHOR
Mark Stosberg <mark@summersault.com>
SEE ALSO
* CGI::Session - CGI::Session manual
* CGI::Session::Tutorial - extended CGI::Session manual
* CGI::Session::CookBook - practical solutions for real life problems
* RFC 2965 - "HTTP State Management Mechanism" found at
ftp://ftp.isi.edu/in-notes/rfc2965.txt
* CGI - standard CGI library
* Apache::Session - another fine alternative to CGI::Session