Provided by: libmongoc-doc_1.15.0-1_all bug


       mongoc_collection_count - mongoc_collection_count()


       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.


          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


       · 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.


       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 are propagated via the error parameter.


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


          #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);


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