public static void main(String[] args) {
        try {
            SQLHelper sQLHelper = new SQLHelper();
            sQLHelper.sqlConnect();
            //sQLHelper.runUpdate("insert into teacher values('10060120','haha','zheng','jjhsjl')");
            ResultSet rs = sQLHelper.runQuery("select * from teacher");
            while (rs.next()) {
                System.out.println(rs.getString(1));
            }
            sQLHelper.sqlClose();
        } catch (SQLException ex) {
            Logger.getLogger(SQLHelper.class.getName()).log(Level.SEVERE, null, ex);
        }
    }