Question

我试图插入数据库。我有以下两个实体：

用户：

public class User
{
    private UserDescription _userDescription;

    public virtual uint Id { get; set; }
    public virtual string Email { get; set; }
    public virtual string Username { get; set; }

    public virtual UserDescription UserDescription
    {
        get { return _userDescription; }
        set { _userDescription = value; }
    }

    public virtual void Add(UserDescription userDescription)
    {
        if (_userDescription != null)
        {
            _userDescription.User = null;
        }
        _userDescription = userDescription;
        _userDescription.User = this;
    }

    public class UserMap : ClassMap<User>
    {
        public UserMap()
        {
            Table("users");

            Id(x => x.Id).GeneratedBy.Identity();
            Map(x => x.Email).Not.Nullable();
            Map(x => x.Username).Not.Nullable();

            HasOne(x => x.UserDescription).Cascade.All().LazyLoad();
        }
    }
}

USERDESCRIPTION ：

public class UserDescription
{
    public virtual uint Id { get; set; }
    public virtual User User { get; set; }
    public virtual uint UserId { get; set; }
    public virtual string Firstname { get; set; }
    public virtual string Lastname { get; set; }

    public class UserDescrptionMap : ClassMap<UserDescription>
    {
        public UserDescrptionMap()
        {
            Table("usersdescription");

            Id(x => x.Id).GeneratedBy.Identity();

            Map(x => x.UserId);
            Map(x => x.Firstname);
            Map(x => x.Lastname);

            HasOne(x => x.User).Constrained().ForeignKey();
        }
    }
}

我通过的JSON看起来如下：

{
   "Email": "Example3@gmail.com",
   "Username": "Something123",
   "UserDescription": {
       "Firstname": "John",
       "Lastname": "Doe"
   }
}

我尝试对用户进行插入，希望它能够级联并插入到子表UserDescription中，但这并不起作用。所以我先插入用户，然后插入UserDescription（不确定这是否理想）。

无论如何，当我成功插入用户后尝试插入UserDescription时出现以下错误：

not-null属性引用null或transient值Users.Entities.UserDescription.User

有什么建议吗？

Answer 1

如果有人感兴趣，我删除了＆＃34; .Constrained（）＆＃34;在UserDescription映射中，这似乎工作。虽然我不知道这是否是最佳解决方案！

流畅的nHibernate＆＃34; not-null属性引用空值或瞬态值＆＃34;使用外键

1 个答案: