WARNING:

          Deprecated  since version 1.11.0: This function is deprecated and should not be used in
          new         code.          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 migrating from deprecated count functions 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.

SYNOPSIS

          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)
           BSON_GNUC_DEPRECATED_FOR (mongoc_collection_count_documents or
                                     mongoc_collection_estimated_document_count);

PARAMETERS

       • 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.

DESCRIPTION

       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 query reference 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

       Errors are propagated via the error parameter.

RETURNS

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

EXAMPLE

          #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);
             }
          }

AUTHOR

       MongoDB, Inc

COPYRIGHT

       2017-present, MongoDB, Inc