Author image Ingy döt Net
and 1 contributors


CogBase - A CogBase Implementation in Perl


This Database implementation is in its infancy. Just barely a proof of concept so far. It would be ridiculous of you to use it for anything serious, yet.


    use CogBase;

    my $conn = CogBase->connect('');

    my $schema = $conn->node('Schema');
    +: person
    <: Node
    age: Number
    given_name: String
    family_name: String

    my $person = $conn->node('person');

    $person->family_name('dot Net');


    my @results = $conn->query('!person');
    my @nodes = $conn->fetch(@results);

    for my $node (@nodes) {
        print "%s %s is %d years old\n",



CogBase is a Object Database Management System.

Some interesting characteristics of its design are:

  • All objects are stored as nodes.

  • Every node has a universally unique id.

  • Every node has a type.

  • Every type has a schema.

  • Every schema, is itself, a node in the db.

  • Every schema has a base/super schema that it inherits from.

  • Schemas can be used to generate programming language (Perl) classes for every type (schema) of node.

  • CogBase defines several core scalar types.

  • CogBase defines one core schema (that every schema inherits from).

  • Every node has one or more revisions.

  • Every revision is immutable.

  • Database access methods are connect, create, store, fetch, query and disconnect.

  • All nodes have access control based on the Unix File System.

  • HTTP is used for the network layer. GET and POST are used for all operations.

  • Database can be used over network or embedded.

  • Access control is based on Unix File System


Ingy döt Net, <ingy at>


Please report any bugs or feature requests to bug-cogbase at, or through the web interface at I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.


You can find documentation for this module with the perldoc command.

    perldoc CogBase

You can also look for information at:


Unix, HTTP


Copyright 2006 Ingy döt Net, all rights reserved.

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

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