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Perl module P407
State and Cookies
Exercises, examples and other material relating to training module P407. This topic is presented on public course Using Perl on the Web

Each time you submit a form to a web server using CGI, you start a new program with new variables, and when the server has sent you back its response, that program exits, with a loss of all data in memory. That's fine for a one-screen application, but in practise you'll want to string together a series of forms to make up a shopping application, a bulletin board, or another application. To do this, you'll need to "maitain state" and there are various ways of doing this, which this important module studies.

Related technical and longer articles
Handling Cookies through CGI.pm

Articles and tips on this subjectupdated
1951Whisky - Setting and reading cookies from Perl
Fancy a Whisky - if you click on this link, our barman will choose a glass of whisky at random for you, and give it you on the house. Once you're hooked and secured as a customer, he'll sell you further glasses of the same whisky, remembering how many you've had and which is 'your' tipple. Just keep ...
243new 'Perl on the Web' example
I've been looking for quite a while to put together an example that uses sessions (via hidden fields or cookies) in Perl ... written to a good standard, with decent error messages, security and user feedback, and with the look-and-feel of the page separated from the code so that each can be maintained ...
Examples from our training material
sweet.pl   Perl, CGI, sessions - application template, first principles
sweeter.pl   Perl, CGI, sessions - complete application template second steps
sweetest.pl   Perl, CGI, sessions - complete application template, full demo
whisky.pl   Cookies from first principles - demonstration
Maintaining State
A study in concentration
Background information
Some modules are available for download as a sample of our material or under an Open Training Notes License for free download from [here].
Topics covered in this module
The need for non-transient data.
Multiple users.
Hidden fields.
Shopping carts.
State diagrams.
Central database example.
Persistent cookies.
Complete learning
If you are looking for a complete course and not just a information on a single subject, visit our Listing and schedule page.

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