在NHibernate中，如何在更新父對象時添加子對象？

Question

我在Person對象和Address對象之間有一個簡單的父/子關係。 Person對象存在於數據庫中。在完成Get on Person之後，我將一個新的Address對象添加到父對象的Address子對象列表中，並對Person對象進行一些其他更新。最後，我對Person對象進行更新。使用SQL跟蹤窗口，我可以將Person對象的更新看到Person表，並將地址記錄的插入到地址表中。

問題是，執行更新後，AddressId（Address對象上的主鍵）仍然設置爲0，這是您首次初始化Address對象時默認設置的值。我已經證實，當我做一個添加，這個值設置正確。當嘗試添加子對象作爲NHibernate UPDATE的一部分時，這是一個已知問題嗎？示例代碼和映射文件低於

感謝

<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

嘗試：

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 

通常的做法是揭露添加並管理集合，例如刪除方法

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