lambdaQueryWrapper多條件嵌套查詢方式
lambdaQueryWrapper多條件嵌套查詢
需求:根據條件獲取一段時期內按照年份和周存儲的數據
表結構如下
userNetType | moduleName | cityName | subjectCname | subjectEname | pv | uv | year | week |
---|---|---|---|---|---|---|---|---|
1 | 1 | 江蘇省 | 死神專題 | sszt | 100 | 70 | 2019 | 51 |
1 | 1 | 江蘇省 | 海賊王專題 | hzwzt | 200 | 80 | 2019 | 52 |
1 | 1 | 江蘇省 | 火影忍者專題 | hyrzzt | 300 | 90 | 2020 | 01 |
/** * @param pageNum 當前頁 * @param pageSize 每頁條數 * @param moduleName 產品 * @param userNetType 運營商 * @param cityName 城市名稱 * @param beginTime 開始周的任意一天日期(例如:2019-12-20) * @param endTime 結束周的任意一天日期(例如:2020-01-20) * @param keyWord 查詢條件(專題英文名或者中文名) * @return */ //開始年份 String beginYear = null; //結束年份 String endYear = null; //開始周數 String beginWeek = null; //結束周數 String endWeek = null; /*這部分內容忽略,調用瞭其他的方法, 反正就是為瞭獲取開始日期所在的年份、周數以及結束日期所在的年份、周數*/ if (StringUtils.isBlank(beginTime) || StringUtils.isBlank(endTime)) { DateTime dateTime = DateUtil.lastWeek(); //格式化日期,結果:yyyyMMdd beginTime = DateUtil.formatDate(dateTime); beginYear = TimeUtils.getDateOfYearWeek(beginTime).get("year"); endYear = beginYear; beginWeek = TimeUtils.getDateOfYearWeek(beginTime).get("week"); endWeek = beginWeek; } else { beginYear = TimeUtils.getDateOfYearWeek(beginTime).get("year"); endYear = TimeUtils.getDateOfYearWeek(endTime).get("year"); beginWeek = TimeUtils.getDateOfYearWeek(beginTime).get("week"); endWeek = TimeUtils.getDateOfYearWeek(endTime).get("week"); } Page<DwSubjectDataInfoWw> page = new Page<>(pageNum, pageSize); LambdaQueryWrapper<DwSubjectDataInfoWw> queryWrapper = Wrappers.<DwSubjectDataInfoWw>lambdaQuery(); if (beginYear.equals(endYear)) { queryWrapper.eq(DwSubjectDataInfoWw::getYear, beginYear); queryWrapper.between(DwSubjectDataInfoWw::getWeek, beginWeek, endWeek); } else { //因為Java8 Lambda表達式中最終變量問題,重新賦值一個參數解決 String year1 = beginYear; String year2 = endYear; String week1 = beginWeek; String week2 = endWeek; queryWrapper.and(wrapper -> wrapper.and(wrapper1 -> wrapper1.eq(DwSubjectDataInfoWw::getYear, year1).ge(DwSubjectDataInfoWw::getWeek, week1)) .or(wrapper2 -> wrapper2.eq(DwSubjectDataInfoWw::getYear, year2).le(DwSubjectDataInfoWw::getWeek, week2))); } queryWrapper.orderByDesc(DwSubjectDataInfoWw::getYear); queryWrapper.orderByDesc(DwSubjectDataInfoWw::getWeek); if (StrUtil.isNotEmpty(cityName)) { queryWrapper.eq(DwSubjectDataInfoWw::getCityName, cityName); } if (StrUtil.isNotEmpty(userNetType)) { queryWrapper.eq(DwSubjectDataInfoWw::getUserNetType, userNetType); } if (StrUtil.isNotEmpty(moduleName)) { queryWrapper.eq(DwSubjectDataInfoWw::getModuleName, moduleName); } //搜索條件可以是專題中文名或英文名 if (StrUtil.isNotEmpty(keyWord)) { queryWrapper.and(wrapper -> wrapper.like(DwSubjectDataInfoWw::getSubjectCname, keyWord).or().like(DwSubjectDataInfoWw::getSubjectEname, keyWord)); } try { Page<DwSubjectDataInfoWw> list = dwSubjectDataInfoWwService.page(page, queryWrapper); return AjaxResult.success(list); } catch (Exception e) { logger.error("獲取分周專題數據列表錯誤,錯誤信息為:", e); return AjaxResult.error(); }
下面是根據條件生成的SQL語句
WHERE ( ( (year = ? AND week >= ?) OR (year = ? AND week <= ?) ) AND city_name = ? AND user_net_type = ? AND module_name = ? AND ( subject_cname LIKE ? OR subject_ename LIKE ? ) ) ORDER BY year DESC, week DESC
LambdaQueryWrapper 常用條件
以上為個人經驗,希望能給大傢一個參考,也希望大傢多多支持WalkonNet。
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