Deprecated since version 1.11.0: Use mongoc_collection_count_documents() or

       MongoDB, Inc

       2009-present, MongoDB, Inc.

1.30.4                                            Jun 08, 2025                        MONGOC_COLLECTION_COUNT(3)

       This function shall execute a count query on  the  underlying  'collection'.  The  bson  'query'  is  not
       validated, simply passed along as appropriate to the server.  As such, compatibility and errors should be
       validated in the appropriate server documentation.

       For more information, see the queryreference at the MongoDB website.

       The  mongoc_read_concern_t  specified  on  the mongoc_collection_t will be used, if any. If read_prefs is
       NULL, the collection's read preferences are used.

       Errors are propagated via the error parameter.

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

          static void
          print_query_count (mongoc_collection_t *collection, bson_t *query)
          {
             bson_error_t error;
             int64_t count;

             count = mongoc_collection_count (
                collection, MONGOC_QUERY_NONE, query, 0, 0, NULL, &error);

             if (count < 0) {
                fprintf (stderr, "Count failed: %s\n", error.message);
             } else {
                printf ("%" PRId64 " documents counted.\n", count);
             }
          }

       • collection: A mongoc_collection_t.

       • flags: A mongoc_query_flags_t.

       • query: A bson_t containing the query.

       • skip: A int64_t, zero to ignore.

       • limit: A int64_t, zero to ignore.

       • read_prefs: A mongoc_read_prefs_t or NULL.

       • error: An optional location for a bson_error_t or NULL.

       -1 on failure, otherwise the number of documents counted.

          int64_t
          mongoc_collection_count (mongoc_collection_t *collection,
                                   mongoc_query_flags_t flags,
                                   const bson_t *query,
                                   int64_t skip,
                                   int64_t limit,
                                   const mongoc_read_prefs_t *read_prefs,
                                   bson_error_t *error);

          Deprecated      since      version      1.11.0:     Use     mongoc_collection_count_documents()     or
          mongoc_collection_estimated_document_count() instead.

          mongoc_collection_count_documents() has similar performance to calling mongoc_collection_count()  with
          a  non-NULL  query,  and  is  guaranteed  to retrieve an accurate collection count. See migratingfromdeprecatedcountfunctions for details.

          mongoc_collection_estimated_document_count()    has    the     same     performance     as     calling
          mongoc_collection_count()  with a NULL query, but is not guaranteed to retrieve an accurate collection
          count.

       This function is considered a retryable read operation.  Upon a transient error (a network error,  errors
       due  to  replica set failover, etc.) the operation is safely retried once.  If retryreads is false in the
       URI (see mongoc_uri_t) the retry behavior does not apply.