使用fluent nhibernate在关系表中配置一对0或1关系

以下是我的课程：

public class User {
    public virtual int Id { get; private set;}
    public virtual IList<Bike> { get; set;}
}

public class Bike {
    public virtual int Id { get; private set;}
    public virtual string color { get; set;}
}

public class Accident{
    public virtual int Id { get; private set;}
    public virtual User User{ get; set;}
    public virtual Bike Bike{ get; set;}
}

还有我的桌子

用户：Id 自行车：Id、颜色、userfk 意外：身份证 意外事件：意外ID、用户ID、BikeId 事故可能与自行车碰撞有关，也可能与使用者有关，但与自行车无关。 我的问题是如何配置事故类映射以使用意外事故表

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希望你能帮忙。

嗨，迈克尔。谢谢你详尽的回答。它让我意识到我的表设计不够有效，尝试使用nhibernate映射它是一件痛苦的事情，因为nhibernate需要逻辑表设计。我想我会按照你的建议换桌子的。谢谢

Lets see if I can get this right so it is helpful to you.

1. On the 3rd line, you left out "Bike" for the name you are assigning the 
   relation to.
2. Lines 4, 10 & 11, you were missing the reverse mappings.
   I added them with the following assumptions:
     a. A user can ride more than 1 bike.
     b. A user can be in more than 1 accident.
     c. A bike can be involved in more than 1 accident.
     d. A bike can only be used by 1 user.
        If you need the bike to be able to be used by more than 1 user
        change line 10 to: public virtual IList<User> User { get; set;}
        This will give you a Many to Many relationship.
3. I would merge the tables Accident and AccidentOccurance into 1 table 
   "Accident". Since if you kept them separated, you are looking at a 1 to 1 
   relationship that does not offer any special benefits. With the vast 
   majority of all 1 to 1 relationships, it is best to merge the tables to 
   limit the SQL queries and speed up your queries on large tables.


public class User {
    public virtual int Id { get; private set;}
    public virtual IList<Bike> Bike { get; set;} // Modified
    public virtual IList<Accident> Accident { get; set;} // Added
}

public class Bike {
    public virtual int Id { get; private set;}
    public virtual string color { get; set;}
    public virtual User User { get; set;} // Added
    public virtual IList<Accident> Accident { get; set; } // Added
}

public class Accident{
    public virtual int Id { get; private set;}
    public virtual User User{ get; set;}
    public virtual Bike Bike{ get; set;}
}