Hibernate用户与地址一对多关联后address表users_id为空如何解决

云原生阿岚

2026-10-2

问题原因

你配置的是双向关联，mappedBy = "userEntity" 代表由Address实体的userEntity字段负责外键关联的维护，JPA只会根据该字段的值写入外键users_id。
你当前仅给AdresseDto设置了userDto，但ModelMapper默认不会自动把AdresseDto.userDto映射为AdressesEntity.userEntity，最终插入数据库时Address实体的userEntity属性为空，导致外键字段为null。

解决方案

修改Service层的CreateUser方法，在保存UserEntity前，手动给每个Address实体绑定关联的用户对象即可：

@Override
public UserDto CreateUser(UserDto userDto) {
    UserEntity checkExisting_User = userRepository.findByEmail(userDto.getEmail());
    if (checkExisting_User != null)
        throw new RuntimeException("user already exist !");
    for (int i = 0; i < userDto.getAdresses().size(); i++) {
        AdresseDto address = userDto.getAdresses().get(i);
        address.setUserDto(userDto);
        address.setAdesseId(util.generatedValue(30));
        userDto.getAdresses().set(i, address);
    }
    userDto.getContact().setUser(userDto);
    userDto.getContact().setContactId(util.generatedValue(30));
    ModelMapper modelMapper = new ModelMapper();
    UserEntity userEntity = modelMapper.map(userDto, UserEntity.class);
    userEntity.setEcryptyPassword(bCryptPasswordEncoder.encode(userDto.getPassword()));
    userEntity.setUserId(util.generatedValue(32));

    // ========== 新增以下代码 ==========
    if(userEntity.getAdresses() != null && !userEntity.getAdresses().isEmpty()){
        for(AdressesEntity addr : userEntity.getAdresses()){
            addr.setUserEntity(userEntity);
        }
    }
    // ========== 新增代码结束 ==========

    UserEntity newUser = userRepository.save(userEntity);
    UserDto userDto1 = modelMapper.map(newUser, UserDto.class);
    return userDto1;
}