MONGOC_MATCHER_T

NAME

mongoc_matcher_t - mongoc_matcher_t

Client-side document matching abstraction

SYNOPSIS

typedef struct _mongoc_matcher_t mongoc_matcher_t;

mongoc_matcher_t provides a reduced-interface for client-side matching of BSON documents.

It can perform the basics such as $in, $nin, $eq, $neq, $gt, $gte, $lt, and $lte.

WARNING:

mongoc_matcher_t does not currently support the full spectrum of query operations that the MongoDB server supports.

DEPRECATED

WARNING:

mongoc_matcher_t is deprecated and will be removed in version 2.0.

EXAMPLE

Filter a sequence of BSON documents from STDIN based on a query

#include <bson/bson.h>
#include <mongoc/mongoc.h>
#include <stdio.h>

int
main (int argc, char *argv[])
{
mongoc_matcher_t *matcher;
bson_reader_t *reader;
const bson_t *bson;
bson_t *spec;
char *str;
int fd;

mongoc_init ();

#ifdef _WIN32
fd = fileno (stdin);
#else
fd = STDIN_FILENO;
#endif

reader = bson_reader_new_from_fd (fd, false);

spec = BCON_NEW ("hello", "world");
matcher = mongoc_matcher_new (spec, NULL);

while ((bson = bson_reader_read (reader, NULL))) {
if (mongoc_matcher_match (matcher, bson)) {
str = bson_as_canonical_extended_json (bson, NULL);
printf ("%s\n", str);
bson_free (str);
}
}

bson_reader_destroy (reader);
bson_destroy (spec);

mongoc_cleanup ();

return 0;
}

AUTHOR

MongoDB, Inc

COPYRIGHT

2017-present, MongoDB, Inc