Xapian::Enquire(3pm) User Contributed Perl Documentation Xapian::Enquire(3pm)
NAME
Search::Xapian::Enquire - Make queries against a database
DESCRIPTION
This class provides an interface to the information retrieval system for the purpose of searching.
METHODS
new
set_query
takes either a ready made Search::Xapian::Query or a scalar containing a query, which in that case will be passed to
Search::Xapian::Query's constructor, together with any other passed arguments.
set_query_object <query>
get_query
matches <start> <size> [<check_at_least>]
Takes the start element, and maximum number of elements (and optionally the minimum number of matches to check), and returns an array
tied to Search::Xapian::MSet::Tied.
get_matching_terms_begin
Returns a Search::Xapian::TermIterator, pointing to the start of the stream.
get_matching_terms_end
Returns a Search::Xapian::TermIterator, pointing to the end of the stream.
set_collapse_key <collapse_key>
set_docid_order <order>
Set the direction in which documents are ordered by document id in the returned MSet.
This order only has an effect on documents which would otherwise have equal rank. For a weighted probabilistic match with no sort
value, this means documents with equal weight. For a boolean match, with no sort value, this means all documents. And if a sort value
is used, this means documents with equal sort value (and also equal weight if ordering on relevance after the sort).
order can be ENQ_ASCENDING (the default, docids sort in ascending order), ENQ_DESCENDING (docds sort in descending order), or
ENQ_DONT_CARE (docids sort in whatever order is most efficient for the backend.)
Note: If you add documents in strict date order, then a boolean search - i.e. set_weighting_scheme(Search::Xapian::BoolWeight->new()) -
with set_docid_order(ENQ_DESCENDING) is a very efficient way to perform "sort by date, newest first".
set_cutoff <percent_cutoff> [<weight_cutoff>]
set_sort_by_relevance
Set the sorting to be by relevance only. This is the default.
set_sort_by_value <sort_key> [<ascending>]
Set the sorting to be by value only.
sort_key - value number to reorder on. Sorting is with a string compare. If ascending is true (the default) higher is better; if
ascending is false, lower is better.
ascending - If true, document values which sort higher by string compare are better. If false, the sort order is reversed. (default
true)
set_sort_by_value_then_relevance <sort_key> [<ascending>]
Set the sorting to be by value, then by relevance for documents with the same value.
sort_key - value number to reorder on. Sorting is with a string compare. If ascending is true (the default) higher is better; if
ascending is false, lower is better.
ascending - If true, document values which sort higher by string compare are better. If false, the sort order is reversed. (default
true)
set_sort_by_relevance_then_value <sort_key> [<ascending>]
Set the sorting to be by relevance then value.
Note that with the default BM25 weighting scheme parameters, non-identical documents will rarely have the same weight, so this setting
will give very similar results to set_sort_by_relevance(). It becomes more useful with particular BM25 parameter settings (e.g.
BM25Weight(1,0,1,0,0)) or custom weighting schemes.
sort_key - value number to reorder on. Sorting is with a string compare. If ascending is true (the default) higher is better; if
ascending is false, lower is better.
ascending - If true, document values which sort higher by string compare are better. If false, the sort order is reversed. (default
true)
set_sort_by_key <sorter> [<ascending>]
Set the sorting to be by key only.
sorter - the functor to use to build the key.
ascending - If true, keys which sort higher by string compare are better. If false, the sort order is reversed. (default true)
set_sort_by_key_then_relevance <sorter> [<ascending>]
Set the sorting to be by key, then by relevance for documents with the same key.
sorter - the functor to use to build the key.
ascending - If true, keys which sort higher by string compare are better. If false, the sort order is reversed. (default true)
set_sort_by_relevance_then_key <sorter> [<ascending>]
Set the sorting to be by relevance then key.
sorter - the functor to use to build the key.
ascending - If true, keys which sort higher by string compare are better. If false, the sort order is reversed. (default true)
get_mset
Get match set.
get_eset <maxitems> <rset> [<decider>]
Get set of query expansion terms.
get_description
Return a description of this object.
SEE ALSO
Search::Xapian::Query, Search::Xapian::Database
perl v5.14.2 2012-05-09 Xapian::Enquire(3pm)