mongoc_bulk_operation_update_one()
Synopsis
void mongoc_bulk_operation_update_one (mongoc_bulk_operation_t *bulk, const bson_t *selector, const bson_t *document, bool upsert);
This function queues an update as part of a bulk operation. It will only modify a single document on the MongoDB server. This function does not execute the operation. To execute the entirety of the bulk operation call mongoc_bulk_operation_execute().