QueryWrapper<User> queryWrapper = new QueryWrapper<>(); queryWrapper.eq("status", "1"); int count = userMapper.selectCount(queryWrapper); 这里使用QueryWrapper作为示例,LambdaQueryWrapper的使用方式类似,只是参数类型为Lambda表达式,更加类型安全。
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...
select 字段 from 表名 group by 字段 having 条件; select count(lastname),dept_id,s_dept.name from s_emp,s_dept where dept_id=s_dept.id group by dept_id having count(last_name)>3; 1. 2. SQL语句的执行顺序 select 组函数(字段),字段 from 表名 where 条件 group by 分组标准 having 过...
inSql(R column, Object... values); // 等价于 字段 IN (sql 语句), 例: inSql("id", "select id from table where id < 3") ---> id in (select id from table where id < 3) notInSql(R column, Object... values); // 等价于 字段 NOT IN (sql 语句) 主要实现的java代码如下,实...
(); 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 ...
.orderByAsc(HwSecuritiesInfo::getId); wrapper.lambda().select(HwSecuritiesInfo::getId, HwSecuritiesInfo::getBusinessId, HwSecuritiesInfo::getCompanyCode); wrapper.last("limit " + param.getCount()); return hwSecuritiesInfoService.list(wrapper); ...
HwSecuritiesInfo>wrapper=newQueryWrapper<>();wrapper.lambda().gt(HwSecuritiesInfo::getId,param.getJsid()).orderByAsc(HwSecuritiesInfo::getId);wrapper.lambda().select(HwSecuritiesInfo::getId,HwSecuritiesInfo::getBusinessId,HwSecuritiesInfo::getCompanyCode);wrapper.last("limit "+param.getCount())...
(); 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...
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 ...