bionic (3) Catmandu::Store::MongoDB::CQL.3pm.gz

NAME

       Catmandu::Store::MongoDB::CQL - Converts a CQL query string to a MongoDB query string

SYNOPSIS

           $mongo_query = Catmandu::Store::ElasticSearch::CQL
                           ->new(mapping => $cql_mapping)
                           ->parse($cql_query_string);

DESCRIPTION

       This package currently parses most of CQL 1.1:

           and
           or
           not
           srw.allRecords
           srw.serverChoice
           srw.anywhere
           cql.allRecords
           cql.serverChoice
           cql.anywhere
           =
           scr
           <
           >
           <=
           >=
           <>
           exact
           all
           any
           within

       See <https://www.loc.gov/standards/sru/cql/spec.html> for more information on the CQL query language.

LIMITATIONS

       MongoDB is not a full-text search engine. All queries will try to find exact matches in the database,
       except for the 'any' and 'all' relations which will translate queries into wildcard queries (which are
       slow!):

          title any 'funny cats'

       will be treated internally as something like:

           title : { $regex : /funny/ } OR title : { $regex : /cats/ }

       And,

           title all 'funny cats'

       as

           title : { $regex : /funny/ } AND title : { $regex : /cats/ }

       This makes the 'any' and 'all' not as efficient (fast) as exact matches '==','exact'.

METHODS

   parse
       Parses the given CQL query string with CQL::Parser and converts it to a Mongo query string.

   visit
       Converts the given CQL::Node to a Mongo query string.

REMARKS

       no support for fuzzy search, search modifiers, sortBy and encloses

SEE ALSO

       CQL::Parser.