@Test public void testQueryWrapper8() { LambdaQueryWrapper<User> wrapper = Wrappers.lambdaQuery(); wrapper.select(User::getId,User::getName); wrapper.like(User::getName,"悟").eq(User::getEmail,"aa@qq.com"); List<User> userList = userMapper.selectList(wrapper); userList.forEach(System...
// 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...
LambdaQueryWrapper<Order>:构建一个针对Order表的查询条件。 orderWrapper.eq(Order::getUserId, userId):通过用户ID过滤相关订单。 orderService.list(orderWrapper):执行查询,返回订单列表。 使用userService.getById(order.getUserId())根据订单中的用户ID获取用户信息。 步骤4:执行查询并获取结果 在上述代码中,我...
LambdaQueryWrapper<Xuqiu> xuqiuwrapper = Wrappers.<Xuqiu>lambdaQuery(); xuqiuwrapper.isNull(Xuqiu::getPaiqiyuefen); xuqiuwrapper.orderByDesc(Xuqiu::getYouxianji,Xuqiu::getZhongyaochengdu,Xuqiu::getGongzuoliang); List<Xuqiu> xuqius = xuqiuMapper.selectList(xuqiuwrapper);...
@RequiredArgsConstructorpublicclassTestController{privatefinal TestService testService;@NonNullprivateTestMapper testMapper;@GetMapping("/testLambda")publicResulttestLambda(){LambdaQueryWrapper<Test>query=newLambdaQueryWrapper<>();query.select(Test::getName).eq(Test::getId,14);List<Test>tests1=testMapper....
LambdaQueryWrapper<User> queryWrapper = Wrappers.lambdaQuery(); queryWrapper.like(User::getName, \"张\") .lt(User::getAge,30) .or(wrapper -> wrapper.eq(User::getGender, \"女\")); List<User> userList = userMapper.selectList(queryWrapper); ...
List<Test> tests3 = testMapper.selectList(Wrappers.<Test>query().lambda().eq(Test::getId,16)); System.out.println(tests1); System.out.println(tests2); System.out.println(tests3); return Result.success("成功"); } } // 这里需要思考动态条件,判断条件后再拼装sql ...
UpdateWrapper<User> updateWrapper =newUpdateWrapper<>(); updateWrapper.in("age",Arrays.asList(20,30,40)); updateWrapper.set("name","jack"); updateWrapper.set("age",43); updateWrapper.set("email","sakara@qq.top"); userService.update(updateWrapper); ...
LambdaQueryWrapper<User> userWrapper = Wrappers.<User>lambdaQuery().ge(User::getAge, 30);LambdaQueryWrapper<Order> orderWrapper = Wrappers.<Order>lambdaQuery().inSql(Order::getUserId, "SELECT id FROM user", userWrapper);List<Order> orderList = orderDao.selectList(orderWrapper); ...
.eq(User::getUserName, "test")然后,我们使用gt方法来设置年龄的查询条件,这里我们查询年龄大于18岁的用户:.gt(User::getAge, 18);最后,我们通过userMapper对象调用selectList方法,传入之前创建的wrapper对象,从而获取满足上述条件的用户列表:List userList = userMapper.selectList(wrapper);