lambdaQueryWrapper多條件嵌套查詢方式

更新時(shí)間：2022年01月11日 09:28:42 作者：吃蘋果配蘿卜

這篇文章主要介紹了lambdaQueryWrapper多條件嵌套查詢方式，具有很好的參考價(jià)值，希望對(duì)大家有所幫助。如有錯(cuò)誤或未考慮完全的地方，望不吝賜教。

lambdaQueryWrapper多條件嵌套查詢

需求：根據(jù)條件獲取一段時(shí)期內(nèi)按照年份和周存儲(chǔ)的數(shù)據(jù)

表結(jié)構(gòu)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(dāng)前頁
     * @param pageSize    每頁條數(shù)
     * @param moduleName  產(chǎn)品
     * @param userNetType 運(yùn)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(jié)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(jié)束年份
        String endYear = null;
        //開始周數(shù)
        String beginWeek = null;
        //結(jié)束周數(shù)
        String endWeek = null;
        /*這部分內(nèi)容忽略，調(diào)用了其他的方法，
         反正就是為了獲取開始日期所在的年份、周數(shù)以及結(jié)束日期所在的年份、周數(shù)*/
        if (StringUtils.isBlank(beginTime) || StringUtils.isBlank(endTime)) {
            DateTime dateTime = DateUtil.lastWeek();
            //格式化日期，結(jié)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?yàn)镴ava8 Lambda表達(dá)式中最終變量問題，重新賦值一個(gè)參數(shù)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(shù)據(jù)列表錯(cuò)誤,錯(cuò)誤信息為:", e);
            return AjaxResult.error();
        }

下面是根據(jù)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