*条件构造器 查询操作SelectList */ @Test public void testEntitymapperSelectList() { //查询数据库,性别为男(1),并且名字中带有霸的记录或者email中带有123的记录。 List<Employee> employeeList=employeeMapper.selectList(new EntityWrapper<Employee>() .eq("gender",1) .like("name", "霸") //.or()/...
我们先讲这个selectById,selectBatchIds,selectByMap方法,后面讲条件构造器以及分页再讲; @TestpublicvoidselectById(){ Department department= departmentMapper.selectById(1); System.out.println(department); } @TestpublicvoidselectBatchIds(){ List<Integer> idList=newArrayList<>(); idList.add(1); idList.a...
List<ProcessNodePO> processNodeList = processNodeMapper.selectList(queryWrapper); 方案二:用 Java 代码对查询出的集合重新排序 这个方式也不好 List<ProcessNodePO> processNodeList = processNodeMapper.selectList(queryWrapper); // 使用给定的顺序排序结果 Map<Integer, Integer> orderMap =newHashMap<>(); f...
我们先讲这个selectById,selectBatchIds,selectByMap方法,后面讲条件构造器以及分页再讲; @Test public void selectById(){ Department department = departmentMapper.selectById(1); System.out.println(department); } @Test public void selectBatchIds(){ List<Integer> idList=new ArrayList<>(); idList.add(1...
userMapper.selectList(w); return "success"; } # 控制台 SELECT id,name,age,email,role_id FROM user WHERE ((1 = ?) AND ((name = ? AND age = ?) OR (name = ? AND age = ?))) 分类: 后端/ 对象关系映射 标签: MyBatis Plus 好文要顶 关注我 收藏该文 微信分享 DogLeftover ...
SELECT id,name,age,email FROM user ORDER BY age ASC 按条件查询,使用BaseMapper的selectList方法,传入参数QueryWrapper,并指定要查询的字段 @RequestMapping(value ="/test12") @ResponseBody public String test12(){ mapper.selectList(new QueryWrapper<User>().select("id","name")) ...
java mybatisplus分页查询mapper和mapping mybatis的分页查询,借助数组进行分页原理:进行数据库查询操作时,获取到数据库中所有满足条件的记录,保存在应用的临时数组中,再通过List的subList方法,获取到满足条件的所有记录。实现:首先在dao层,创建StudentMapper接口,
.eq("user_role.role_id", roleId);returnuserMapper.selectList(wrapper); } 2、多表关联查询并排序 publicList<User>getUserListOrderByRoleName(){ QueryWrapper<User> wrapper =newQueryWrapper<>(); wrapper.select("user.*").distinct() .from("user") ...
SELECT*FROMuser_infoWHEREtom_age='20'andname='tom'; 等同于 QueryWrapper<UserInfo> queryWrapper =newQueryWrapper(); queryWrapper.eq("tom_age", '20');//tom_age必须是数据库中的字段queryWrapper.eq("name",'tom'); List<UserInfo> list = userInfoMapper.selectList(queryWrapper );...
调用BaseMapper接口中的selectList方法,传入参数Wrappers,写法2 @RequestMapping(value = "/test7") @ResponseBody public String test7(){ // 查询所有,根据age升序排序 List<User> users = mapper.selectList(Wrappers.<User>lambdaQuery().orderByAsc(User::getAge)); assertThat(users).isNotEmpty(); Syste...