@文心快码lambdaquerywrapper count group by 文心快码 当然,作为Comate,我很乐意帮你解答关于LambdaQueryWrapper进行count和group by操作的问题。 1. 理解LambdaQueryWrapper的作用和使用方法LambdaQueryWrapper是MyBatis-Plus中的一个条件构造器,它主要用于构建数据库查询条件,支持链式调用,使得查询条件的编写更加简洁和类型...
importcom.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;importcom.baomidou.mybatisplus.core.toolkit.Wrappers;publicclassStudentService{publicvoidgroupByTest(){LambdaQueryWrapper<Student>queryWrapper=Wrappers.lambdaQuery();queryWrapper.select("class","score","count(1) as count").groupBy(Student...
GROUP BY uoi.CPCode, YEAR(uoi.OrderTime) UNION --按产品统计 SELECT 'Product', 'Year', YEAR(uoi.OrderTime), MAX(uoi.CPCode), MAX(c.CPChName), uoi.ProductCode, MAX(p.ProductName), COUNT(0) FROM UserOrderInfo uoi JOIN CPInfo c ON uoi.CPCode = c.CPCode JOIN ProductInfo p ON uoi...
groupBy(R... columns); // 等价于 GROUP BY 字段, ..., 例: groupBy("id", "name") ---> group by id,name orderByAsc(R... columns); // 等价于 ORDER BY 字段, ... ASC, 例: orderByAsc("id", "name") ---> order by id ASC,name ASC orderByDesc(R... columns); // 等价...
(); wrapper.lambda().gt(HwSecuritiesInfo::getId, param.getJsid()) .orderByAsc(HwSecuritiesInfo::getId); wrapper.lambda().select(HwSecuritiesInfo::getId, HwSecuritiesInfo::getBusinessId, HwSecuritiesInfo::getCompanyCode); wrapper.last("limit " + param.getCount()); return hwSecuritiesInfo...
<association property="articleCount" javaType="com.unicom.portal.pcm.entity.MsArticleCount"/> </resultMap> 查询sql语句: MsArticlecount 实体对象的属性值可以从 上面的 select 后的 sql 字段进行匹配映射获取。 05 foreach 搭配 in 查询 利用foreach 遍历 array 集合的参数,拼成 in 查询条件 ...
wrapper.last("limit " + param.getCount()); return hwSecuritiesInfoService.list(wrapper); } 8、【UpdateWrapper 自定义修改条件】 set(String column, Object val);// 用于设置 set 字段值。 例: set("name", null) ---> set name = null ...
StringUtil.isEmpty(dsCode)){lqw.likeRight(Ds::getDsCode,SqlUtil.escapeLike(dsCode));lqw.groupBy(Ds::getDsCode).having("count (0) >1");}elseif(!StringUtil.isEmpty(dsSourceName)){lqw.like(Ds::getDsSourceName,SqlUtil.escapeLike(dsSourceName));lqw.groupBy(Ds::getDsSourceName);}else...
StringUtil.isEmpty(dsCode)) { lqw.likeRight(Ds::getDsCode, SqlUtil.escapeLike(dsCode)); lqw.groupBy(Ds::getDsCode).having("count (0) >1"); } else if (!StringUtil.isEmpty(dsSourceName)) { lqw.like(Ds::getDsSourceName, SqlUtil.escapeLike(dsSourceName)); lqw.groupBy(Ds::getDs...
wrapper.last("limit " + param.getCount()); return hwSecuritiesInfoService.list(wrapper); 1. 2. 3. 4. 5. 6. 7. 8、【UpdateWrapper 条件:】 set(String column, Object val); // 用于设置 set 字段值。例: set("name", null) ---> set name = null ...