QueryWrapper qw = new QueryWrapper(); if(Objects.equals("轻音乐",likeStr)) { qw.orderByDesc...("value1"); } else if(Objects.equals("摇滚音乐",likeStr)) { qw.orderByDesc("value2"); } else...if(Objects.equals("流行音乐",likeStr)) { qw.orderByDesc("value3"); } else if(Objects.equals(..."爵士乐",likeStr)) { qw.orderByDesc("value4"); } else if(Objects.equals("古典乐",likeStr)) {...qw.orderByDesc("value5"); } qw.last("limit 10"); return new ResultUtil>().setData
ASC 例: orderByAsc("id", "name") ---> order by id ASC,name ASC orderByDesc 排序：ORDER BY 字段, ......DESC 例: orderByDesc("id", "name") ---> order by id DESC,name DESC 测试用例： import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper...QueryWrapper(); //SELECT id,user_name,password,name,age,email FROM tb_user ORDER BY age DESC wrapper.orderByDesc
常用于查询符合多个值中某一个的数据 isNull 用于判断某个字段是否为空值 isNotNull 用于判断某个字段是否不为空值 orderByAsc 按升序排列，用于对查询结果按照指定字段进行从小到大的排序 orderByDesc...name字段是否非null this.condition.isNotNull("name") orderByAsc 根据id，进行升序 this.condition.orderByAsc("id") orderByDesc...根据id，进行降序 this.condition.orderByDesc("id") limit 查询2条数据，从第1条开始 this.condition.limit(2, 1) or 逻辑或，查询...greaterThan、lessThan等 字符串匹配：beginsWith、endsWith、contains 空值判断：isNull、isNotNull 集合操作：in 排序限制：orderByAsc、orderByDesc
orderByDesc("top_at")....orderByDesc("created_time"); Page manuscriptPage = page(new Page(pageNum, pageSize
☞ orderByDesc orderByDesc(R... columns) orderByDesc(boolean condition, R... columns) ?
cabName") .where(Sqls.custom().andEqualTo("count", 0) .andLike("name", "%d%")) .orderByDesc...MybatisDemo> demos = mybatisDemoMapper.selectByExample(Example.builder(MybatisDemo.class).where(sqls).orderByDesc
TransFlow> queryWrapper = new QueryWrapper(); queryWrapper .eq("user_id", userId) .orderByDesc...userLoginRecordQueryWrapper = new QueryWrapper(); userLoginRecordQueryWrapper .eq("user_id", userId) .orderByDesc
columns) order by ... asc/desc orderByAsc(R... columns) orderByAsc(boolean condition, R... columns) orderByDesc...(R... columns) orderByDesc(boolean condition, R... columns) orderBy(boolean condition, boolean isAsc
排序与分页按价格降序排列：query() .lessThan("price", 50) .orderByDesc("price") .get(); 分页查询...（跳过前5条，取10条）：query() .lessThan("price", 50) .orderByDesc("price") .limit(10, 5) // limit
wrapper.orderBy(true, true, User::getStatus); // ✅ 推荐：多字段排序示例 wrapper.orderByAsc(User::getStatus) .orderByDesc...更简洁，减少解析开销 数据库优化器可以更好地处理范围查询 代码更易读，语义更清晰 减少重复编写字段名的机会 排序字段注意索引 // ❌ 不推荐 // 假设lastLoginTime无索引 wrapper.orderByDesc...(User::getLastLoginTime); // ✅ 推荐 // 主键排序 wrapper.orderByDesc(User::getId); // ✅ 更优写法：组合索引排序 wrapper.orderByDesc...(User::getStatus) // status建立了索引 .orderByDesc(User::getId); // 主键排序 原因: 索引天然具有排序特性，可以避免额外的排序操作...(Objects.nonNull(age), User::getAge, age) .eq(User::getDeleted, false) // 默认查询未删除记录 .orderByDesc
(), gasTimedTask.getPageSize());QueryWrapper qw = new QueryWrapper();qw.orderByDesc
"+title+"%"); return movieDb.selectList(queryWrapper); } } 4 排序 QueryWrapper 对象还提供了 “orderByDesc...” 和 “orderByAsc” 等方法，可以简单实现排序 queryWrapper.orderByDesc("dateReleased"); 5 分页 （1）配置分页拦截器： 在配置类（也可以是SpringBoot
isNull 2.13 isNotNull 2.14 in 2.15 notIn 2.16 inSql 2.17 notInSql 2.18 groupBy 2.19 orderByAsc 2.20 orderByDesc...condition, R... columns) 排序：ORDER BY 字段, … ASC 例: orderByAsc("id", "name")—>order by id ASC,name ASC 2.20 orderByDesc...orderByDesc(R... columns) orderByDesc(boolean condition, R... columns) 排序：ORDER BY 字段, … DESC 例: orderByDesc....eq("gender", 0) // .orderBy(true,true,"age") // .orderByDesc
) orderByAsc(boolean condition, R... columns) 实例 orderByAsc("id", "name")—>order by id ASC,name ASC orderByDesc...orderByDesc(R... columns) orderByDesc(boolean condition, R... columns) 排序：ORDER BY 字段, … DESC 例: orderByDesc
select * from user order by id ASC,name ASC list.forEach(System.out::println); } //TODO orderByDesc...ASC // orderByDesc("id", "name")--->order by id DESC,name DESC @Test public void orderByDesc...() { QueryWrapper wrapper = new QueryWrapper(); wrapper.orderByDesc("id", "name");
1.3 查询名字中“J”开头并且年龄大于等于25，按照年龄降序排列，年龄相同按照id升序排列 难度系数 ★★★ 考察 likeRight、orderByDesc、orderByAsc 用法 SQL语句：...queryWrapper = new QueryWrapper(); 13 queryWrapper.likeRight("name","J").or().gt("age",26).orderByDesc
void slelectWrapperAsc(){ QueryWrapper queryWrapper = new QueryWrapper(); //orderByDesc...降序 orderByAsc 升序 queryWrapper.orderByDesc("age") .orderByAsc("id");...void delectWrapperAsc(){ QueryWrapper queryWrapper = new QueryWrapper(); //orderByDesc...void slelectWrapperAsc(){ QueryWrapper queryWrapper = new QueryWrapper(); //orderByDesc...降序 orderByAsc 升序 queryWrapper.orderByDesc("age") .orderByAsc("id");
queryWrapper.or（）——或者 queryWrapper.and（）——和 queryWrapper.orderByAsc(“属性”)——根据属性升序排序 queryWrapper.orderByDesc
keyword, 2f)); } //排序 if(sort==1){ //按新品从新到旧 wrapper.orderByDesc...(EsProduct::getId); }else if(sort==2){ //按销量从高到低 wrapper.orderByDesc(...wrapper.orderByAsc(EsProduct::getPrice); }else if(sort==4){ //按价格从高到低 wrapper.orderByDesc
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