zoukankan      html  css  js  c++  java
  • 关于Date

    1.java DateUtil工具包可将"Wed, 21 Dec 2022 14:20:00 GMT"格式的字符串专程Date类型:

    Date expiration = DateUtil.parseRfc822Date("Wed, 21 Dec 2022 14:20:00 GMT");

    2.mysql有now()之类的函数

    mysql还有ON DUPLICATE KEY触发器

    @SQL("INSERT INTO $T_ORDER_EXTEND (order_id, IMEI_extend) values ( :1, :2) ON DUPLICATE KEY UPDATE IMEI_extend = :2 , update_time = :3")
    int updateIMEIExtendCode(Integer orderId, Long IMEIExtendCode, String date);

    3.过期时间

    private final Long cacheTime = 60 * 60 * 1000 * 4L;
    private Long initTime = 0L;
    
    private void refreshDictionary() {
            Long nowTime = System.currentTimeMillis();
            if (nowTime >= initTime) {
                initTime = nowTime + cacheTime;
                List<CardDictionary> list = dictionaryMapper.getAll();
                if (CollectionUtils.isNotEmpty(list)) {
                    for (CardDictionary card : list) {
                        cardNoAndName.put(card.getCardNo()+"_"+card.getCardName(), card.getCardName());
                    }
                }
            }
        }

    每次查询都先refreshDictionary()

    4.Java8 LocalDateTime

    http://blog.csdn.net/u011277123/article/details/53665028


    LocalDateTime 与 Date的转换
    https://www.cnblogs.com/exmyth/p/6425878.html

  • 相关阅读:
    模拟赛2020.9.11
    棋盘(dfs)
    树的重心
    模拟赛9.4
    最大数(线段树)
    [模板] 线段树
    [模板][数据结构] 树状数组
    [AHOI2018初中组][二分查找] 分组
    [模板] Kruskal 求最小生成树
    [模板] 最近公共祖先(LCA)的几种求法
  • 原文地址:https://www.cnblogs.com/peanutk/p/8494087.html
Copyright © 2011-2022 走看看