在尝试在 NHibernate 中创建双向一对一映射时,我发现,我无法递归地获得对象的引用。
Person
例如:假设我在和之间存在一对一的关系Address
。
然后在执行以下代码后,
class Person
{
... ...
public Address Address { get;set; }
}
class Address
{
... ...
public Person Person {get;set;}
}
Repository<Person> rep = new Repository<Person>();
Person p = rep.Get<Person>(1);
我需要null
从p.Address.Person
. 即 ID 为 1 的同一个人。
但是该属性正在返回一个null
-value。
我应该寻找什么来解决问题?
我的数据库表是这样的:
Address {ID, Desc}
Person {ID, Name, AddressID}
人.hbm.xml
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping
xmlns="urn:nhibernate-mapping-2.2"
default-access="property"
>
<class name="NHibernate__BiDirectional__One_To_One.BO.Person, NHibernate__BiDirectional__One_To_One.BO"
table="Person">
<id name="ID">
<generator class="native" />
</id>
<property name="Name"/>
<many-to-one
name="Address"
class="NHibernate__BiDirectional__One_To_One.BO.Address, NHibernate__BiDirectional__One_To_One.BO"
column="AddressID"
cascade="all"
unique="true" />
</class>
</hibernate-mapping>
地址.hbm.xml
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping
xmlns="urn:nhibernate-mapping-2.2"
default-access="property"
>
<class name="NHibernate__BiDirectional__One_To_One.BO.Address, NHibernate__BiDirectional__One_To_One.BO"
table="Address">
<id name="ID" >
<generator class="native" />
</id>
<property name="Desc"/>
<one-to-one
name="Person"
class="NHibernate__BiDirectional__One_To_One.BO.Person, NHibernate__BiDirectional__One_To_One.BO"
/>
</class>
</hibernate-mapping>
我也收到一个错误:
could not load an entity: [NHibernate__BiDirectional__One_To_One.BO.Person#1][SQ
L: SELECT person0_.ID as ID0_1_, person0_.Name as Name0_1_, address1_.ID as ID1_
0_, address1_.Desc as Desc1_0_, address1_.AddressID as AddressID1_0_ FROM Person
person0_ left outer join Address address1_ on person0_.ID=address1_.AddressID W
HERE person0_.ID=?]
Incorrect syntax near the keyword 'Desc'.