Question

我在Person对象和Address对象之间有一个简单的Parent / Child关系。 Person对象存在于DB中。在对Person进行Get之后，我将一个新的Address对象添加到父对象的子对象列表中，并对Person对象进行一些其他更新。最后，我对Person对象进行了更新。使用SQL跟踪窗口，我可以看到对Person表的Person对象的更新和Address表的Insert地址记录。

问题在于，执行更新后，AddressId（Address对象上的主键）仍设置为0，这是第一次初始化Address对象时的默认值。我已经验证当我执行添加时，此值已正确设置。当尝试添加子对象作为NHibernate UPDATE的一部分时，这是一个已知问题吗？示例代码和映射文件位于

之下

谢谢

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"> 
  <class name="BusinessEntities.Wellness.Person,BusinessEntities.Wellness" table="Person" lazy="true" dynamic-insert="true" dynamic-update="false"> 
    <id name="Personid" column="PersonID" type="int"> 
      <generator class="native" /> 
    </id> 
    <version type="binary" generated="always" name="RecordVersion" column="`RecordVersion`"/> 
    <property type="int" not-null="true" name="Customerid" column="`CustomerID`" /> 
    <property type="AnsiString" not-null="true" length="9" name="Ssn" column="`SSN`" /> 
    <property type="AnsiString" not-null="true" length="30" name="FirstName" column="`FirstName`" /> 
    <property type="AnsiString" not-null="true" length="35" name="LastName" column="`LastName`" /> 
    <property type="AnsiString" length="1" name="MiddleInitial" column="`MiddleInitial`" /> 
    <property type="DateTime" name="DateOfBirth" column="`DateOfBirth`" /> 
    <bag name="PersonAddresses" inverse="true" lazy="true" cascade="all"> 
      <key column="PersonID" /> 
      <one-to-many class="BusinessEntities.Wellness.PersonAddress,BusinessEntities.Wellness" / 
    </bag> 
  </class> 
</hibernate-mapping>

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"> 
  <class name="BusinessEntities.Wellness.PersonAddress,BusinessEntities.Wellness" table="PersonAddress" lazy="true" dynamic-insert="true" dynamic-update="false"> 
    <id name="PersonAddressId" column="PersonAddressID" type="int"> 
      <generator class="native" /> 
    </id> 
    <version type="binary" generated="always" name="RecordVersion" column="`RecordVersion`" /> 
    <property type="AnsiString" not-null="true" length="1" name="AddressTypeid" column="`AddressTypeID`" /> 
    <property type="AnsiString" not-null="true" length="60" name="AddressLine1" column="`AddressLine1`" /> 
    <property type="AnsiString" length="60" name="AddressLine2" column="`AddressLine2`" /> 
    <property type="AnsiString" length="60" name="City" column="`City`" /> 
    <property type="AnsiString" length="2" name="UsStateId" column="`USStateID`" /> 
    <property type="AnsiString" length="5" name="UsPostalCodeId" column="`USPostalCodeID`" /> 
    <many-to-one name="Person" cascade="none" column="PersonID" /> 
  </class> 
</hibernate-mapping>


        Person newPerson = new Person(); 
        newPerson.PersonName = "John Doe"; 
        newPerson.SSN = "111111111"; 
        newPerson.CreatedBy = "RJC"; 
        newPerson.CreatedDate = DateTime.Today; 
        personDao.AddPerson(newPerson); 
        Person updatePerson = personDao.GetPerson(newPerson.PersonId); 

        updatePerson.PersonAddresses = new List<PersonAddress>(); 
        PersonAddress addr = new PersonAddress(); 
        addr.AddressLine1 = "1 Main St"; 
        addr.City = "Boston"; 
        addr.State = "MA"; 
        addr.Zip = "12345"; 
        updatePerson.PersonAddresses.Add(addr); 
        personDao.UpdatePerson(updatePerson); 
        int addressID = updatePerson.PersonAddresses[0].AddressId;

Answer 1

尝试：

    updatePerson.PersonAddresses = new List<PersonAddress>(); 
    PersonAddress addr = new PersonAddress(); 
    addr.AddressLine1 = "1 Main St"; 
    addr.City = "Boston"; 
    addr.State = "MA"; 
    addr.Zip = "12345"; 
    updatePerson.PersonAddresses.Add(addr);
    addr.Person = updatePerson

通常的做法是公开用于管理集合的添加和删除方法，例如

public void AddAddress(Address addr)
{
    PersonAddresses.Add(addr);
    addr.Person = this;
}

使用NHibernate，如何在更新父对象时添加子对象？

1 个答案: