java数据库不匹配和错误处理

Question

需要返回

  

“时间戳与ID匹配：”+ id

如果时间戳匹配或未在数据库中匹配以下代码。 这是什么标准做法？

public void update(User entity) throws Exception {
    try(Connection conn = DBConnection.getConnection()){
        String sql = "UPDATE USERS SET " +
                "FLAG = ?" +
                "WHERE ID = ? " +
                "AND LASTUPDATEDTIMESTAMP = ?";

        PreparedStatement preparedStatement = conn.prepareStatement(sql);
        preparedStatement.setBoolean(1, entity.getFlag());
        preparedStatement.setString(2, entity.getId());
        preparedStatement.setTimestamp(3, new java.sql.Timestamp(entity.getLastUpdatedTimestamp()));
        int updateCount = preparedStatement.executeUpdate();
        //logic here

    }catch(SqlException e){
      // method here
    }
}