1RDF::Trine::Iterator::BUisnedrinCgosn(t3r)ibuted Perl DoRcDuFm:e:nTtraitnieo:n:Iterator::Bindings(3)
2
3
4

NAME

6       RDF::Trine::Iterator::Bindings - Iterator class for bindings query
7       results
8

VERSION

10       This document describes RDF::Trine::Iterator::Bindings version 1.019
11

SYNOPSIS

13        use RDF::Trine::Iterator::Bindings;
14
15        my $iterator = RDF::Trine::Iterator::Bindings->new( \&data, \@names );
16        while (my $row = $iterator->next) {
17          # $row is a HASHref containing variable name -> RDF Term bindings
18          my @vars = keys %$row;
19          print $row->{ 'var' }->as_string;
20        }
21

METHODS

23       Beyond the methods documented below, this class inherits methods from
24       the RDF::Trine::Iterator class.
25
26       "new ( \@results, \@names, %args )"
27       "new ( \&results, \@names, %args )"
28           Returns a new SPARQL Result interator object. Results must be
29           either a reference to an array containing results or a CODE
30           reference that acts as an iterator, returning successive items when
31           called, and returning undef when the iterator is exhausted.
32
33       "materialize"
34           Returns a materialized version of the current binding iterator.
35           The materialization process will leave this iterator empty. The
36           materialized iterator that is returned should be used for any
37           future need for the iterator's data.
38
39       "project ( @columns )"
40           Returns a new stream that projects the current bindings to only the
41           given columns.
42
43       "join_streams ( $stream, $stream )"
44           Performs a natural, nested loop join of the two streams, returning
45           a new stream of joined results.
46
47       "nested_loop_join ( $outer, $inner )"
48           Performs a natural, nested loop join of the two streams, returning
49           a new stream of joined results.
50
51           Note that the values from the $inner iterator are fully
52           materialized for this join, and the results of the join are in the
53           order of values from the $outer iterator. This suggests that:
54
55           * If sorting needs to be preserved, the $outer iterator should be
56           used to determine the result ordering.
57
58           * If one iterator is much smaller than the other, it should likely
59           be used as the $inner iterator since materialization will require
60           less total memory.
61
62       "sorted_by"
63       "binding_value_by_name ( $name )"
64           Returns the binding of the named variable in the current result.
65
66       "binding_value ( $i )"
67           Returns the binding of the $i-th variable in the current result.
68
69       "binding_values"
70           Returns a list of the binding values from the current result.
71
72       "binding_names"
73           Returns a list of the binding names.
74
75       "binding_name ( $i )"
76           Returns the name of the $i-th result column.
77
78       "bindings_count"
79           Returns the number of variable bindings in the current result.
80
81       "is_bindings"
82           Returns true if the underlying result is a set of variable
83           bindings.
84
85       "as_json ( $max_size )"
86           Returns a JSON serialization of the stream data.
87
88       "as_xml ( $max_size )"
89           Returns an XML serialization of the stream data.
90
91       "as_string ( $max_size [, \$count] )"
92           Returns a string table serialization of the stream data.
93
94       "as_statements ( $pattern | @names )"
95           Returns a RDF::Trine::Iterator::Graph with the statements of the
96           stream.
97
98           If $pattern, an RDF::Trine::Pattern object, is given as an
99           argument, each of its triples are instantiated with variable
100           bindings from each row of the iterator, and returned as
101           RDF::Trine::Statement objects from a new
102           RDF::Trine::Iterator::Graph iterator.
103
104           If 3 variable @names are supplied, their corresponding variable
105           bindings in each row of the iterator are used (in order) as the
106           subject, predicate, and object of new RDF::Trine::Statement objects
107           and returned from a new RDF::Trine::Iterator::Graph iterator.
108
109       "print_xml ( $fh, $max_size )"
110           Prints an XML serialization of the stream data to the filehandle
111           $fh.
112
113       "construct_args"
114           Returns the arguments necessary to pass to the stream constructor
115           _new to re-create this stream (assuming the same closure as the
116           first argument).
117

DEPENDENCIES

119       JSON
120
121       Scalar::Util
122

BUGS

124       Please report any bugs or feature requests to through the GitHub web
125       interface at <https://github.com/kasei/perlrdf/issues>.
126

AUTHOR

128       Gregory Todd Williams  "<gwilliams@cpan.org>"
129

131       Copyright (c) 2006-2012 Gregory Todd Williams. This program is free
132       software; you can redistribute it and/or modify it under the same terms
133       as Perl itself.
134
135
136
137perl v5.30.0                      2019-07-26 RDF::Trine::Iterator::Bindings(3)
Impressum