public void countUsers() { // 创建 LambdaQueryWrapper 对象 LambdaQueryWrapper<User> queryWrapper = new LambdaQueryWrapper<>(); // 添加查询条件,例如查询状态为 1 的用户 queryWrapper.eq(User::getStatus, 1); // 执行 count 查询 int count = userMapper.selectCount(queryWrapper); //...
lqw.groupBy(Ds::getDsCode).having("count (0) >1"); } else if (!StringUtil.isEmpty(dsSourceName)) { lqw.like(Ds::getDsSourceName, SqlUtil.escapeLike(dsSourceName)); lqw.groupBy(Ds::getDsSourceName); } else if (!StringUtils.isEmpty(dsNewsColumns)) { lqw.like(Ds::getDsNewsColum...
LambdaQueryWrapper<User>wrapper=newLambdaQueryWrapper<User>().select(User::getName)// 指定查询的字段.groupBy(User::getName)// 按照name字段进行分组.having("count(*) > 1");// 过滤掉只出现一次的记录List<User>userList=userMapper.selectList(wrapper); 1. 2. 3. 4. 5. 6. 在上面的示例中,我...
在设置完查询条件后,调用 MyBatis-Plus 提供的统计方法进行操作。常用的统计方法包括 count、countDistinct 等。下面是一些示例代码: // 统计满足条件的记录数intcount=mapper.selectCount(queryWrapper);// 统计满足条件的不重复记录数intdistinctCount=mapper.selectCount(queryWrapper.setDistinct(true)); 1. 2. 3....
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...
List<Detail> list = list(newQueryWrapper<Detail>().select("sum(skipping_duration) totalDuration","count(1) totalTimes") .lambda().eq(Detail::getUserId, userId)); ——— 版权声明:本文为CSDN博主「classyex」的原创文章,遵循CC 4.0 BY-SA版权协议,转载请附上原文出处链接及本声明。 原文链接:htt...
()-1)*page.getSize(),page.getSize(),queryWrapper));}returnpage;}@Cacheable(cacheNames=RedisConfig.SBH_PLAT_ORDER_COUNT_CACHE_KEY,key="T(com.emax.zhenghe.common.util.security.MD5Util).md5Encode(#queryWrapper.customSqlSegment)")PrePageDtoselectCountCache(@Param(Constants.WRAPPER)Wrapper<Sbh...
intcount =tcmcConfigTreeService.count(newLambdaQueryWrapper<TcmcConfigTree>() .eq(TcmcConfigTree::getNodeName, tcmcConfigTree.getNodeName()).ne(TcmcConfigTree::getId, tcmcConfigTree.getId()) ); LambdaQueryWrapper 条件删除 条件删除符合条件的全部删除 ...
13 Integer result = userMapper.selectCount(queryWrapper);14 System.out.println("result:" + result);15 } 3、LambdaQueryChainWrapper 1//链式查询⽅式 2 User one = new LambdaQueryChainWrapper<>(userMapper)3 .eq(User::getName, "liangd1")4 .one();1 @Test 2void TestLa...
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...