code: private void initSavepoints(final Connection connection) {
  		for (String savepointName : savepointNames) {
  			try {
  				savepointMap.put(savepointName, connection.setSavepoint(savepointName));
  			} catch (SQLException e) {
  				throw new UroborosqlSQLException(e);
  			}
  		}
  	}
docs: Savepointの設定を遅延して行う
  
  @param connection コネクション
  @throws SQLException SQL例外