java常用的

//1--------複製屬性
BeanUtils.copyProperties(memberReq, userBgd);

//2---------註解時間格式
  @DateTimeFormat(pattern = "yyyy-MM-dd")
  
  //3----mybates---模糊查詢
  criteria.andUserAccountLike("%" + req.getUserAccount() + "%");

//4--------------fastjson List轉JSONArray------以及JSONArray轉List
    String res = hd.post(ipCenterService.getIpCenter(Constants.HALL_REQ_KEY), sendmap);
        JSONArray jArray = JSONArray.parseArray(res);
//        BookInfoResult result = gson.fromJson(res, BookInfoResult.class);
        List<AgentDTO> list = JSONObject.parseArray(jArray.toJSONString(), AgentDTO.class);

//5------mybates註解查詢-----和對應參數
         @Select("SELECT create_name FROM data_bgd_b.bgd_special_rid WHERE rid = #{rid,jdbcType=INTEGER} ")
    String selectTopAccountByBRid(@Param("rid") Integer rid);

 //6--map去重
        Map<Integer, BaseGameWinLoseModel> ok_map = new HashMap<>();
        for (BaseGameWinLoseModel one : all_list) {
            if (map.containsKey(one.getUserId())) {
                BaseGameWinLoseModel map_in = ok_map.get(one.getUserId());
                map_in.setGameGoldSend(one.getGameGoldSend() + map_in.getGameGoldSend());
                ok_map.put(one.getUserId(), map_in);
            } else {
                ok_map.put(one.getUserId(), one);
            }
        }

 //7--根據日期寫sql
    @Select("SELECT id, rid, rnick, gold_change AS goldChange, gold_after AS goldAfter, safe_box_after AS safeBoxAfter, create_time AS createTime, note, type  FROM ${dbName} WHERE rid = ${rid}  ${type}")
    List<GameGoldWater> selectByDateList(@Param("dbName") String dbName ,@Param("rid") Integer rid,@Param("type") String type);
    //根據日期寫sql
    @Select("SELECT COUNT(*) FROM ${dbName} WHERE rid = ${rid} ${type}")
    long selectByDateCount(@Param("dbName") String dbName ,@Param("rid") Integer rid,@Param("type") String type);

//8----mybatis裏面大於和小於

>--- &gt;   < -- &lt;

<if test="days!=-1 and days !=null and days!=0">
            and DATE_FORMAT(computeTime, '%Y-%m-%d') &gt;= DATE_SUB(CURDATE(), INTERVAL #{days} DAY)
        </if>