NAME
MongoDB::QueryResult - An iterator for Mongo query results
VERSION
version v2.2.0
SYNOPSIS
$cursor = $coll->find( $filter );
$result = $cursor->result;
while ( $doc = $result->next ) {
process_doc($doc)
}DESCRIPTION
This class defines an iterator against a query result. It automatically fetches additional results from the originating mongod/mongos server on demand.
For backwards compatibility reasons, MongoDB::Cursor encapsulates query parameters and generates a MongoDB::QueryResult object on demand. All iterators on MongoDB::Cursor delegate to MongoDB::QueryResult object.
Retrieving this object and iterating on it directly will be slightly more efficient.
USAGE
Error handling
Unless otherwise explicitly documented, all methods throw exceptions if an error occurs. The error types are documented in MongoDB::Error.
To catch and handle errors, the Try::Tiny and Safe::Isa modules are recommended:
Cursor destruction
When a MongoDB::QueryResult object is destroyed, a cursor termination request will be sent to the originating server to free server resources.
Multithreading
NOTE: Per threads documentation, use of Perl threads is discouraged by the maintainers of Perl and the MongoDB Perl driver does not test or provide support for use with threads.
Iterators are cloned in threads, but not reset. Iterating from multiple threads will give unpredictable results. Only iterate from a single thread.
METHODS
has_next
if ( $response->has_next ) {
...
}Returns true if additional documents are available. This will attempt to get another batch of documents from the server if necessary.
next
while ( $doc = $result->next ) {
process_doc($doc)
}Returns the next document or undef if the server cursor is exhausted.
batch
while ( @batch = $result->batch ) {
for $doc ( @batch ) {
process_doc($doc);
}
}Returns the next batch of documents or an empty list if the server cursor is exhausted.
all
@docs = $result->all;Returns all documents as a list.
AUTHORS
David Golden <david@mongodb.com>
Rassi <rassi@mongodb.com>
Mike Friedman <friedo@friedo.com>
Kristina Chodorow <k.chodorow@gmail.com>
Florian Ragwitz <rafl@debian.org>
COPYRIGHT AND LICENSE
This software is Copyright (c) 2019 by MongoDB, Inc.
This is free software, licensed under:
The Apache License, Version 2.0, January 2004