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.IX Title "Catmandu::Store::MongoDB::CQL 3pm"
.TH Catmandu::Store::MongoDB::CQL 3pm "2021-09-02" "perl v5.32.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Catmandu::Store::MongoDB::CQL \- Converts a CQL query string to a MongoDB query string
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 3
\&    $mongo_query = Catmandu::Store::ElasticSearch::CQL
\&                    \->new(mapping => $cql_mapping)
\&                    \->parse($cql_query_string);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This package currently parses most of \s-1CQL 1.1:\s0
.PP
.Vb 10
\&    and
\&    or
\&    not
\&    srw.allRecords
\&    srw.serverChoice
\&    srw.anywhere
\&    cql.allRecords
\&    cql.serverChoice
\&    cql.anywhere
\&    =
\&    scr
\&    <
\&    >
\&    <=
\&    >=
\&    <>
\&    exact
\&    all
\&    any
\&    within
.Ve
.PP
See <https://www.loc.gov/standards/sru/cql/spec.html> for
more information on the \s-1CQL\s0 query language.
.SH "LIMITATIONS"
.IX Header "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!):
.PP
.Vb 1
\&   title any \*(Aqfunny cats\*(Aq
.Ve
.PP
will be treated internally as something like:
.PP
.Vb 1
\&    title : { $regex : /funny/ } OR title : { $regex : /cats/ }
.Ve
.PP
And,
.PP
.Vb 1
\&    title all \*(Aqfunny cats\*(Aq
.Ve
.PP
as
.PP
.Vb 1
\&    title : { $regex : /funny/ } AND title : { $regex : /cats/ }
.Ve
.PP
This makes the 'any' and 'all' not as efficient (fast) as exact matches
\&'==','exact'.
.SH "METHODS"
.IX Header "METHODS"
.SS "parse"
.IX Subsection "parse"
Parses the given \s-1CQL\s0 query string with CQL::Parser and converts it to a Mongo query string.
.SS "visit"
.IX Subsection "visit"
Converts the given CQL::Node to a Mongo query string.
.SH "REMARKS"
.IX Header "REMARKS"
no support for fuzzy search, search modifiers, sortBy and encloses
.SH "SEE ALSO"
.IX Header "SEE ALSO"
CQL::Parser.