NAME
WQS::SPARQL::Query::Count - Simple SPARQL count query.
SYNOPSIS
use WQS::SPARQL::Query::Count;
my $obj = WQS::SPARQL::Query::Count->new;
my $sparql = $obj->count_item($property, $item);
my $sparql = $obj->count_value($property, $value);METHODS
new
my $obj = WQS::SPARQL::Query::Count->new;Constructor.
Returns instance of class.
count_item
my $sparql = $obj->count_item($property, $item);Construct SPARQL command and return it.
Returns string.
count_value
my $sparql = $obj->count_value($property, $value);Construct SPARQL command and return it.
Returns string.
ERRORS
new():
From Class::Utils::set_params():
Unknown parameter '%s'.
count_item():
Bad item '%s'.
Bad property '%s'.
count_value():
Bad property '%s'.EXAMPLE1
use strict;
use warnings;
use WQS::SPARQL::Query::Count;
my $obj = WQS::SPARQL::Query::Count->new;
my $property = 'P957';
my $item = 'Q62098524';
my $sparql = $obj->count_item($property, $item);
print "Property: $property\n";
print "Item: $item\n";
print "SPARQL:\n";
print $sparql;
# Output:
# Property: P957
# ISBN: 80-239-7791-1
# SPARQL:
# SELECT (COUNT(?item) as ?count) WHERE {
# ?item wdt:P957 wd:Q62098524
# }EXAMPLE2
use strict;
use warnings;
use WQS::SPARQL::Query::Count;
my $obj = WQS::SPARQL::Query::Count->new;
my $property = 'P957';
my $isbn = '80-239-7791-1';
my $sparql = $obj->count_value($property, $isbn);
print "Property: $property\n";
print "ISBN: $isbn\n";
print "SPARQL:\n";
print $sparql;
# Output:
# Property: P957
# ISBN: 80-239-7791-1
# SPARQL:
# SELECT (COUNT(?item) as ?count) WHERE {
# ?item wdt:P957 '80-239-7791-1'
# }DEPENDENCIES
SEE ALSO
- WQS::SPARQL::Query
-
Useful Wikdata Query Service SPARQL queries.
- WQS::SPARQL::Query::Select
-
Simple SPARQL select query.
REPOSITORY
https://github.com/michal-josef-spacek/WQS-SPARQL-Query
AUTHOR
Michal Josef Špaček mailto:skim@cpan.org
LICENSE AND COPYRIGHT
© 2020-2023 Michal Josef Špaček
BSD 2-Clause License
VERSION
0.01