下面的代码演示orderBy方法,orderByDesc、orderByAsc的使用方法与其相同: // orderByDesc @Test public void testSelect4() { // 1.创建Wrapper对象 QueryWrapper<User> queryWrapper = new QueryWrapper<>(); // 2.构造条件:使用orderByDesc根据id对查询结果降序排列 queryWrapper.orderByDesc("id"); List<User...
// 使用LambdaQueryChainWrapper进行连表查询List<User>userList=newLambdaQueryChainWrapper<>(userMapper).eq(User::getUsername,"admin").ge(User::getAge,18).orderByDesc(User::getCreateTime).list(); 1. 2. 3. 4. 5. 6. 在这个示例中,我们直接使用了LambdaQueryChainWrapper进行连表查询,省去了创建...
"区间一","区间二");//相当于范围内使用的betweenwrapper.like("实体类::查询字段","模糊查询的字符");//模糊查询likewrapper.groupBy("实体类::查询字段");//相当于group by分组wrapper.in("实体类::查询字段","包括的值,分割");//相当于inwrapper.orderByAsc("实体类::查询字段");/...
执行结果:QueryChainWrapper:[HouseEntity(houseId=2, houseOwner=LS, houseArea=72), HouseEntity(houseId=1, houseOwner=ZS, houseArea=70)] LambdaQueryWrapper @Testpublicvoidtest3() {List<HouseEntity> list=houseMapper.selectList(newLambdaQueryWrapper<HouseEntity>() .orderByDesc(HouseEntity::getHouseA...
1//链式查询方式2User one =newLambdaQueryChainWrapper<>(userMapper)3.eq(User::getName, "liangd1")4.one(); 1@Test2voidTestLambdaQueryChainWrapper() {3//1、eq查询单条4User one =newLambdaQueryChainWrapper<>(userMapper)5.eq(User::getName, "liangd1")6.one();7System.out.println("User...
("实体类::查询字段"); //相当于group by分组 wrapper.in("实体类::查询字段", "包括的值,分割"); //相当于in wrapper.orderByAsc("实体类::查询字段"); //升序 wrapper.orderByDesc("实体类::查询字段");//降序 wrapper.ge("实体类::查询字段", "要比较的值"); //大于等于 wrapper.le("...
wrapper.eq(School::getId,1);//id为1 or id 为2 都被查出来wrapper.eq(School::getId,2); }).like(School::getSchoolName,"一")//名称like 一的.orderByAsc(School::getId).build()));//排序} 3、高级用法 有的时候前端查询我们会封装一个类来接收前端参数,传统模式我们要把这个类转换为wrapper对象...
LambdaQueryChainWrapper是MyBatis-Plus中的一个链式查询封装类,用于构建带有条件的查询语句。 LambdaQueryChainWrapper 可以通过链式调用一系列方法来构建查询条件。这些方法包括eq、ne、gt、ge、lt、le等等,用于设置等于、不等于、大于、大于等于、小于、小于等于等条件。可以用实体类的属性名作为参数,避免直接写数据库...
However, If I do add StartDate into the ORDER BY, then the output is 7 lines (Because apparently there are 7 different hours in the database), instead of 3 lines (Evening, Early night and Late night). How do I edit the query so that the outcome is like this: ...
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