NHibernate映射外鍵

Question

我有兩張表，Vehicle和Make。這兩個是使用MakeId作爲車輛表上的外鍵加入的。我的映射文件類似於這樣

<?xml version="1.0" encoding="utf-8" ?> 
    <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"> 
     <class name="Demo.Business.Objects.Vehicle, Demo.Business.Objects" table="Vehicle" > 
     <id name="VehicleId" type="int" > 
      <generator class="native" /> 
     </id> 
     <property name="RegNumber" type="String" /> 
     <property name="VehicleId" type="int" /> 
     <property name="CustomerId" type="int" /> 

     <join table="Make" fetch="join"> 

      <key column="MakeId" foreign-key="MakeId"/> 
      <property name="Description" type="String" /> 
     </join> 
     </class> 
    </hibernate-mapping> 

我還以爲這將加入兩個表上廠名標識，但該IOS產生嘗試的SQL以下連接：vehicle.vehicleid = make.makeid.

我怎樣才能得到這工作？即我預計：

select * from Vehicle 
    inner join Make on Make.MakeId = Vehicle.Make Id 

Answer 1

你需要以不同的方式映射製作類：

<?xml version="1.0" encoding="utf-8" ?> 
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"> 
    <class name="Demo.Business.Objects.Vehicle, Demo.Business.Objects" table="Vehicle" > 
    <id name="VehicleId" type="int" > 
     <generator class="native" /> 
    </id> 
    <property name="RegNumber" type="String" /> 
    <property name="VehicleId" type="int" /> 
    <property name="CustomerId" type="int" /> 
    <many-to-one name="Make" column="MakeId"/> 
    </class> 
    <class name="(blahblah).Make, blahblah"> 
    <id name="MakeId" type="int"> 
     <generator class="native" /> 
    </id> 

    <property name="Description" type="String" /> 
    </class> 
</hibernate-mapping> 

你的「汽車」類的類型應該作的一作出財產。