private StateException rollback(Connection conn, Throwable e) {
        try {
            if (conn != null) {
                conn.rollback();
            }
            return new StateException(e);
        } catch (SQLException se) {
            return new StateException("Unable to rollback transaction", e);
        }
    }
@author Robert HG (254963746@qq.com) on 5/20/15.
lts-core/src/main/java/com/github/ltsopensource/store/jdbc/SqlTemplateImpl.java