code: public static String load(LoadConfiguration config, String prefix) {
  		if (config.getMode() == Mode.INSERT) {
  			return loadInsert(config, prefix);
  		}
  		else if (config.getMode() == Mode.UPDATE) {
  			return loadUpdate(config, prefix);
  		}
  		throw new IllegalArgumentException("Unsupported mode " + config.getMode());
  	}
docs: Builds sql clause to load data into a database.
  
  @param config Load configuration.
  @param prefix Prefix for temporary resources.
  @return the load DDL