MybatisPlus扩展功能

@GetMapping("{id}")
@ApiOperation("根据id查询用户")
public UserVO queryUserById(@ApiParam("用户ID") @PathVariable Long id){
    return userService.queryUserAndAddressById(id);
}

@Override
public UserVO queryUserAndAddressById(Long id) {
    // 查询用户
    User user = getById(id);
    if (user == null|| user.getStatus() == 2){
        throw new RuntimeException("用户状态异常！");
    }
    // 查询地址
    List<Address> addresses = Db.lambdaQuery(Address.class)
            .eq(Address::getUserId, id)
            .list();
    // 封装VO
    // 转User的PO为VO
    UserVO userVO = BeanUtil.copyProperties(user, UserVO.class);
    // 转地址VO
    if (CollUtil.isNotEmpty(addresses)){
        userVO.setAddresses(BeanUtil.copyToList(addresses, AddressVO.class));
    }
    return null;
}

@GetMapping
@ApiOperation("根据id批量查询用户")
public List<UserVO> queryUserById(@ApiParam("用户ID集合") @RequestParam List<Long> ids){
    return userService.queryUserAndAddressByIds(ids);
}

@Override
public List<UserVO> queryUserAndAddressByIds(List<Long> ids) {
    // 查询用户
    List<User> users = listByIds(ids);
    if (CollUtil.isEmpty(users)) {
        return Collections.emptyList();
    }
    // 查询地址
    // 获取用户id集合
    List<Long> userIds = users.stream().map(User::getId).collect(Collectors.toList());
    // 根据用户id查询地址
    List<Address> addresses = Db.lambdaQuery(Address.class).in(Address::getUserId, userIds).list();
    // 转换地址VO
    List<AddressVO> addressVOS = BeanUtil.copyToList(addresses, AddressVO.class);
    // 用户地址集合分组处理，相同用户的放入一个集合（组）中
    Map<Long, List<AddressVO>> addressVOMap = new HashMap<>();
    if (CollUtil.isEmpty(addresses)) {
        addressVOMap = addressVOS.stream().collect(Collectors.groupingBy(AddressVO::getUserId));
    }
    // 转VO返回
    List<UserVO> list = new ArrayList<>(users.size());
    for (User user : users) {
        // 转User的PO为VO
        UserVO userVO = BeanUtil.copyProperties(user, UserVO.class);
        // 转地址VO
        userVO.setAddresses(addressVOMap.get(user.getId()));
        list.add(userVO);
    }
    return list;
}

mybatis-plus:
  type-aliases-package: com.itheima.mp.pojo
  global-config:
      db-config:
          logic-delete-field: deleted # 配置逻辑删除字段（自定义，与表中该字段对应）
          logic-delete-value: 1 # 逻辑已删除值（默认为1）
          logic-not-delete-value: 0 # 逻辑未删除值（默认为0）

@Data
public class User {
    /**
     * 使用状态（1正常 2冻结）
     */
    private UserStatus status;
}

@Getter
public enum UserStatus {
    NORMAL(1, "正常"),
    FREEZE(2, "冻结");
    @EnumValue
    private final int value;
    private final String desc;
    UserStatus(int value, String desc) {
        this.value = value;
        this.desc = desc;
    }
}

mybatis-plus:
  configuration:
    default-enum-type-handler: com.baomidou.mybatisplus.core.handlers.MybatisEnumTypeHandler

@Data
@TableName(value = "user", autoResultMap = true)
public class User {
    /**
     * 详细信息
     */
    @TableField(typeHandler = JacksonTypeHandler.class)
    private UserInfo info;
}

@Data
@AllArgsConstructor(staticName = "of") // UserInfo.of(...) 等同于 new UserInfo(...)
@NoArgsConstructor
public class UserInfo {
    private Integer age;
    private String intro;
    private String gender;
}