SYNOPSIS

my $query = WebService::Solr::Query->new( { foo => 'bar' } );
my $result = $solr->search( $query );

DESCRIPTION

WebService::Solr::Query provides a programmatic way to generate queries to be sent to Solr. Syntax wise, it attempts to be as close to SQL::Abstract WHERE clauses as possible, with obvious exceptions for idioms that do not exist in SQL. Just as values in SQL::Abstract are SQL-escaped, this module does the appropriate Solr-escaping on all values passed to the object (see "escape()").

QUERY SYNTAX

Key-Value Pairs

The simplest way to search is with key value pairs.

    my $q = WebService::Solr::Query->new( { foo => 'bar' } );
    # RESULT: (foo:"bar")

Implicit AND and OR

By default, data received as a HASHREF is AND'ed together.

    my $q = WebService::Solr::Query->new( { foo => 'bar', baz => 'quux' } );
    # RESULT: (foo:"bar" AND baz:"quux")

Furthermore, data received as an ARRAYREF is OR'ed together.

    my $q = WebService::Solr::Query->new( { foo => [ 'bar', 'baz' ] } );
    # RESULT: (foo:"bar" OR foo:"baz")

Nested AND and OR

The ability to nest AND and OR boolean operators is essential to express complex queries. The "-and" and "-or" prefixes have been provided for this need.

    my $q = WebService::Solr::Query->new( { foo => [
        -and => { -prohibit => 'bar' }, { -require => 'baz' }
    ] } );
    # RESULT: (((-foo:"bar") AND (+foo:"baz")))
    
    my $q = WebService::Solr::Query->new( { foo => [
        -or => { -require => 'bar' }, { -prohibit => 'baz' }
    ] } );
    # RESULT: (((+foo:"bar") OR (-foo:"baz")))

Default Field

To search the default field, use the "-default" prefix.

    my $q = WebService::Solr::Query->new( { -default => 'bar' } );
    # RESULT: ("bar")

Require/Prohibit

    my $q = WebService::Solr::Query->new( { foo => { -require => 'bar' } } );
    # RESULT: (+foo:"bar")
    
    my $q = WebService::Solr::Query->new( { foo => { -prohibit => 'bar' } } );
    # RESULT: (-foo:"bar")

Range

There are two types of range queries, inclusive ("-range_inc") and exclusive ("-range_exc"). The "-range" prefix can be used in place of "-range_inc".

    my $q = WebService::Solr::Query->new( { foo => { -range => ['a', 'z'] } } );
    # RESULT: (+foo:[a TO z])
    
    my $q = WebService::Solr::Query->new( { foo => { -range_exc => ['a', 'z'] } } );
    # RESULT: (+foo:{a TO z})

Boost

    my $q = WebService::Solr::Query->new( { foo => { -boost => [ 'bar', '2.0' ] } } );
    # RESULT: (foo:"bar"^2.0)

Proximity

    my $q = WebService::Solr::Query->new( { foo => { -proximity => [ 'bar baz', 10 ] } } );
    # RESULT: (foo:"bar baz"~10)

Fuzzy

    my $q = WebService::Solr::Query->new( { foo => { -fuzzy => [ 'bar', '0.8' ] } } );
    # RESULT: (foo:bar~0.8)

Literal Queries

Specifying a scalar ref as a value in a key-value pair will allow arbitrary queries to be sent across the line. NB: This will bypass any data massaging done on regular strings, thus the onus of properly escaping the data is left to the user.

    my $q = WebService::Solr::Query->new( { '*' => \'*' } )
    # RESULT (*:*)

ACCESSORS

• query - stores the original query structure

METHODS

new( \%query )

Creates a new query object with the given hashref.

stringify( )

Converts the supplied structure into a Solr/Lucene query.

escape( $value )

The following values must be escaped in a search value:

    + - & | ! ( ) { } [ ] ^ " ~ * ? : \

NB: Values sent to "new()" are automatically escaped for you.

unescape( $value )

Unescapes values escaped in "escape()".

D

Debugging constant, default: off.

BUILDARGS

Moose method to handle input to "new()".

AUTHORS

Brian Cassidy <[email protected]>

Jos Boumans <[email protected]>

COPYRIGHT AND LICENSE

Copyright 2008-2014 National Adult Literacy Database

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.