NAME
MongoDBx::KeyValue - Use MongoDB as if it were a key-value store.
VERSION
version 0.001001
SYNOPSIS
use MongoDBx::KeyValue;
my $mkv = MongoDBx::KeyValue->new(kvdb => 'my_key_value_database', %opts);
# 'kvdb' is required, other options are passed to MongoDB::Connection->new()
$mkv->set('cache', 'index.html', '<html><head><title>Index</title></head><body>Index</body></html>');
my $index = $mkv->get('cache', 'index.html');
print $index; # prints '<html><head><title>Index</title></head><body>Index</body></html>'
DESCRIPTION
MongoDBx::KeyValue is a very simple module for easy usage of MongoDB as
a key-value store (similar to Redis, Riak or Memcached).
The interface is very simple: you *set* the values of keys and *get* the
values of keys. Every key-value pair is stored in a bucket, which is
really just a MongoDB collection (the "bucket" terminology is used
merely for resemblance with other key-value stores), so the same key can
exist, with possibly different values, in multiple buckets.
To get the value of a key, just pass the "get()" method the name of the
bucket and the key. If it is not found, "undef" is returned. To set the
value for a key, just provide the "set()" method with the name of the
bucket, the key and the value. If the key already exists in the bucket,
its value will be replaced.
The value for a key can be anything that MongoDB supports, including
simple scalars (strings, numbers, etc.), hash or array references, and
whatever else MongoDB natively supports such as DateTime objects. While
no checking is made for keys, you probably should only use scalars for
them.
Every key-value pair is stored in the database as a document with two
attributes: "_id", which holds the key; and "value", which holds the
value.
CLASS METHODS
new( %opts )
Creates a new instance of this module and connects to the MongoDB
server. The only required option is 'kvdb', which should hold the name
of the database to use for the key-value store. All other options will
be passed to "MongoDB::Connection->new()", so take a look at
"ATTRIBUTES" in MongoDB::Connection for a list of all supported options.
OBJECT METHODS
get( $bucket, $key )
Attempts to find the value for the key $key in the bucket named $bucket.
Returns "undef" if not found.
set( $bucket, $key, $value )
Sets the value for the key named $key inside the bucket named $bucket.
If the key already exists, its value will be replaced with the new one.
It's probably better for keys to be scalars, but values can be anything,
including hash-refs, array-refs and whatever MongoDB can store natively
(take a look at MongoDB::DataTypes for more info).
db()
Returns the MongoDB::Database object of the key-value store.
bucket( $bucket_name )
All this really does is return a MongoDB::Collection object for the
collection named $bucket_name. Use it if you need MongoDB collection
objects for some reason.
DIAGNOSTICS
This module generates the following errors:
* "You must provide the name of the key-value database to use (as
parameter 'kvdb')."
This error will be issued by the "new()" method if you don't provide
it with the 'kvdb' parameter, which should hold the name of the
database to use as the key-value store.
DEPENDENCIES
This module only depends on MongoDB.
INCOMPATIBILITIES
None reported.
BUGS AND LIMITATIONS
No bugs have been reported.
Please report any bugs or feature requests to
"
[email protected]", or through the web interface at
<
http://rt.cpan.org/NoAuth/ReportBug.html?Queue=MongoDBx-KeyValue>.
AUTHOR
Ido Perlmuter <ido at ido50 dot net>
LICENSE AND COPYRIGHT
Copyright (c) 2011, Ido Perlmuter "ido at ido50 dot net".
This module is free software; you can redistribute it and/or modify it
under the same terms as Perl itself, either version 5.8.1 or any later
version. See perlartistic and perlgpl.
The full text of the license can be found in the LICENSE file included
with this module.
DISCLAIMER OF WARRANTY
BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH
YOU. SHOULD THE SOFTWARE PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL
NECESSARY SERVICING, REPAIR, OR CORRECTION.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
REDISTRIBUTE THE SOFTWARE AS PERMITTED BY THE ABOVE LICENCE, BE LIABLE
TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
SOFTWARE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGES.
