/ 
Store-CouchDB-1.3
River stage one • 1 direct dependent • 1 total dependent
/ Store::CouchDB

NAME

Store::CouchDB - a simple CouchDB driver

VERSION

VERSION 1.3

SYNOPSIS

Store::CouchDB is a very this wrapper around CouchDB. It is essentially a set of calls I use in production and that came in handy. This is not meant to be a complete library, it is just complete enough for the things i need to do.

use Store::CouchDB;

my $db = Store::CouchDB->new();
$db->config({host => 'localhost', db => 'your_db'});
my $couch = {
    view   => 'design_doc/view',
    opts   => { key => '"' . $key . '"' },
};
my $status = $db->get_array_view($couch);

FUNCTIONS

new

The Store::CouchDB class takes a number of parameters:

debug

Sets the class in debug mode

host

The host to use. Defaults to 'localhost'

port

The port to use. Defaults to '5984'

db

The DB to use. This has to be set for all oprations!

method

This is internal and sets the request method to be used (GET|POST)

err

This is set if an error has occured and can be called to get the last error with the 'has_error' predicate.

$db->has_error

purge_limit

How many documents shall we try to purge. Defaults to 5000

get_doc

The get_doc call returns a document by its ID

get_doc({id => DOCUMENT_ID, [dbname => DATABASE]})

get_design_docs

The get_design_docs call returns all design document names in an array reference.

get_design_docs({[dbname => DATABASE]})

put_doc

The put_doc call writes a document to the database and either updates a existing document if the _id field is present or writes a new one. Updates can also be done with the update_doc call but that is really just a wrapper for put_doc.

put_doc({doc => DOCUMENT, [dbname => DATABASE]})

del_doc

The del_doc call marks a document as deleted. CouchDB needs a revision to delete a document which is good for security but is not practical for me in some situations. If no revision is supplied del_doc will get the document, find the latest revision and delete the document.

del_doc({id => DOCUMENT_ID, [rev => REVISION, dbname => DATABASE]})

update_doc

The update_doc function is really just a wrapper for the put_doc call and mainly there for compatibility. the naming is different and it is discouraged to use and may disappear in a later version.

update_doc({doc => DOCUMENT, [name => DOCUMENT_ID, dbname => DATABASE]})

copy_doc

The copy_doc is _not_ the same as the CouchDB equivalent. In CouchDB the copy command wants to have a name/id for the new document which is mandatory and can not be ommitted. I find that inconvenient and made this small wrapper. All it does is getting the doc to copy, removes the _id and _rev fields and saves it back as a new document.

copy_doc({id => DOCUMENT_ID, [dbname => DATABASE]})

There are several ways to represent the result of a view and various ways to query for a view. All the views support parameters but there are different functions for GET/POST view handling and representing the reults. The get_view uses GET to call the view and returns a hash with the _id as the key and the document as a value in the hash structure. This is handy for getting a hash structure for several documents in the DB.

get_view(
    {
        view => 'DESIGN_DOC/VIEW',
        opts => { key => "\"" . KEY . "\"" }
    }
);

get_post_view

The get_post_view uses POST to call the view and returns a hash with the _id as the key and the document as a value in the hash structure. This is handy for getting a hash structure for several documents in the DB.

get_post_view(
    {
        view => 'DESIGN_DOC/VIEW',
        opts => [ KEY1, KEY2, KEY3, ... ]
    }
);

get_array_view

The get_array_view uses GET to call the view and returns an array ireference of matched documents. This view functions is the one I use most and has the best support for corner cases.

get_array_view(
    {
        view => 'DESIGN_DOC/VIEW',
        opts => { key => "\"" . KEY . "\"" }
    }
);

purge

This function tries to find deleted documents via the _changes call and then purges as many deleted documents as defined in $self->purge_limit which currently defaults to 5000. This call is somewhat experimental in the moment.

purge({[dbname => DATABASE]})

compact

This compacts the DB file and optionally calls purge and cleans up the view index as well.

compact({[purge=>1, view_compact=>1]})

config

This can be called with a hash of config values to configure the databse object. I use it frequently with sections of config files.

config({[host => HOST, port => PORT, db => DATABASE]})

EXPORT

Nothing is exported at this stage.

AUTHOR

Lenz Gschwendtner, <norbu09 at cpan.org>

BUGS

Please report any bugs or feature requests to bug-store-couchdb at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Store-CouchDB. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT

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

perldoc Store::CouchDB

You can also look for information at:

ACKNOWLEDGEMENTS

COPYRIGHT & LICENSE

Copyright 2009 Lenz Gschwendtner.

This program is free software; you can redistribute it and/or modify it under the terms of either: the GNU General Public License as published by the Free Software Foundation; or the Artistic License.

See http://dev.perl.org/licenses/ for more information.