NAME

       mongoc_collection_count - mongoc_collection_count()

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);

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 <mongoc.h>
          #include <bcon.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

       2018, MongoDB, Inc