mongoc_client_command_simple (mongoc_client_t *client,
                              const char *db_name,
                              const bson_t *command,
                              const mongoc_read_prefs_t *read_prefs,
                              bson_t *reply,
                              bson_error_t *error);

This is a simplified interface to mongoc_client_command(). It returns the first document from the result cursor into reply. The client’s read preference, read concern, and write concern are not applied to the command.


reply is always set, and should be released with bson_destroy().


  • client: A mongoc_client_t.
  • db_name: The name of the database to run the command on.
  • command: A bson_t containing the command specification.
  • read_prefs: An optional mongoc_read_prefs_t. Otherwise, the command uses mode MONGOC_READ_PRIMARY.
  • reply: A location for the resulting document.
  • error: An optional location for a bson_error_t or NULL.


Errors are propagated via the error parameter.


Returns true if successful. Returns false and sets error if there are invalid arguments or a server or network error.

This function does not check the server response for a write concern error or write concern timeout.