Question

我正在尝试使用NHibernate创建单向一对一关系。

示例：订单由客户提供。

Customer{ID, Name, Address}
OrderN{ID, Customer, OrderDate}

此处，OrderN.Customer-field旨在将Customer.ID存储为FK。此字段没有任何唯一约束。

（OrderN表被赋予这样的名称以避免SQL关键字冲突。）

问题是，执行此c＃代码后，OrderN.Customer-field正在存储空值。

但它应该存储客户的ID。即1。

如果我在OrderN.hbm.xml中添加<property name="Customer" column="Customer" />，则抛出异常：

Could not determine type for: NHibernate__One_To_One__Order_Customer.BO.Customer, NHibernate__One_To_One__Order_Customer.BO, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null, for columns: NHibernate.Mapping.Column(Customer)

如何解决这个问题？

可能不是一对一的关系。我实际上是想了解<one-to-one />标签是如何使用的。在这方面，有谁可以帮助我？

Customer.sql

CREATE TABLE [dbo].[Customer](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [Name] [varchar](50) NULL,
    [Address] [varchar](50) NULL,
 CONSTRAINT [PK_Customer] PRIMARY KEY CLUSTERED 
(
    [ID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

Customer.cs

public class Customer
{
    private int _id;
    public virtual int ID
    {
        get { return _id; }
        set { _id = value; }
    }

    private string _name;
    public virtual string Name
    {
        get { return _name; }
        set { _name = value; }
    }

    private string _address;
    public virtual string Address
    {
        get { return _address; }
        set { _address = value; }
    }

}

Customer.hbm.xml

<?xml version="1.0" encoding="utf-8" ?>

<hibernate-mapping
  xmlns="urn:nhibernate-mapping-2.2"
  >
  <class name="NHibernate__One_To_One__Order_Customer.BO.Customer, NHibernate__One_To_One__Order_Customer.BO" table="Customer">
    <id name="ID" >
      <generator class="native" />
    </id>
    <property name="Name" column="Name" />      
    <property name="Address" column="Address" />
  </class>
</hibernate-mapping>

OrderN.sql

CREATE TABLE [dbo].[OrderN](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [Customer] [int] NULL,
    [OrderDate] [datetime] NULL,
 CONSTRAINT [PK_Order] PRIMARY KEY CLUSTERED 
(
    [ID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

GO
ALTER TABLE [dbo].[OrderN]  WITH CHECK ADD  CONSTRAINT [FK_Order_Customer] FOREIGN KEY([Customer])
REFERENCES [dbo].[Customer] ([ID])
GO
ALTER TABLE [dbo].[OrderN] CHECK CONSTRAINT [FK_Order_Customer]

OrderN.cs

public class OrderN
{
    private int _id;
    public virtual int ID
    {
        get { return _id; }
        set { _id = value; }
    }

    private Customer _customer;
    public virtual Customer Customer
    {
        get { return _customer; }
        set { _customer = value; }
    }

    private DateTime _orderDate;
    public virtual DateTime OrderDate
    {
        get { return _orderDate; }
        set { _orderDate = value; }
    }
}

OrderN.hbm.xml

<?xml version="1.0" encoding="utf-8" ?>

<hibernate-mapping 
    xmlns="urn:nhibernate-mapping-2.2" 
    >
  <class name="NHibernate__One_To_One__Order_Customer.BO.OrderN, NHibernate__One_To_One__Order_Customer.BO" table="OrderN">
    <id name="ID">      
      <generator class="native" />
    </id>
    <property name="OrderDate" column="OrderDate"/>


    <one-to-one
        name="Customer"
        class="NHibernate__One_To_One__Order_Customer.BO.Customer, NHibernate__One_To_One__Order_Customer.BO" />


  </class>
</hibernate-mapping>

主程序

OrderN o = new OrderN();
o.OrderDate = DateTime.Now;
o.Customer = new Repository<Customer>().Get<Customer>(1);

Repository<OrderN> rep = new Repository<OrderN>();
rep.Save(o);

Answer 1

所以客户只能拥有一个订单？我希望这是一个很大的！

这不是一对一的关系，而是一对多关系。客户是一方，订单是多方（客户有订单）。尝试像这样映射：

<?xml version="1.0" encoding="utf-8" ?>

<hibernate-mapping 
    xmlns="urn:nhibernate-mapping-2.2" 
    >
  <class name="NHibernate__One_To_One__Order_Customer.BO.OrderN, NHibernate__One_To_One__Order_Customer.BO" table="OrderN">
    <id name="ID">      
      <generator class="native" />
    </id>
    <property name="OrderDate" column="OrderDate"/>


    <many-to-one
        name="Customer"
        class="NHibernate__One_To_One__Order_Customer.BO.Customer, NHibernate__One_To_One__Order_Customer.BO"
        column="Customer" />


  </class>
</hibernate-mapping>

NHibernate单向一对一映射问题