NAME
RRD::Query - Perform queries on RRD file
DESCRIPTION
Simple wrapper around RRDs library to do some simple queries. It implemented more advanced error handling by using the Error module.
CONSTRUCTOR
my $rq = new RRD::Query("/path/to/file.rrd");METHODS
list
@datasources = list();Return the list of all datasource of the given file
Throws:
Error::RRDs - on RRDs library error
fetch
($value) = fetch($ds, cf => $cf, offset => $offset)Fetch a single value from the datasource $ds of RRD file. If $offset is omitted, the last inserted value is returned, otherwise the last value - $offset is returned. If $cf (consolidation function) is omited, AVERAGE is used.
Throws:
Error::RRDs - on RRDs library error
Error::RRD::NoSuchDS - if datasource can't be found in RRD file
get_last
$timestamp = get_last()Returns the timestamp of the inserted value of the RRD file.
Throws:
Error::RRDs - on RRDs library error
EXPORTS
isNaN
$bool = isNaN($value);Returns true if the value is Not a Number.
EXCEPTION CLASSES
Error::RRDs
Error::RRD::NoSuchDS
Error::RRD::isNaN
AUTHOR
Olivier Poitrey <rs@rhapsodyk.net>
LICENCE
RRD::Query, performs queries on RRD files. Copyright (C) 2004 Olivier Poitrey
This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA