Question

我有一个User对象，它有一个与之关联的UserProfile对象，每个对象都有自己的数据库表。我已经使用双向映射将hibernate映射设置为级联操作，这样我就可以在User对象上调用Save，它将自动创建用户配置文件对象，在单个操作中插入生成的UserId in key列。这很好用。 Hibernate映射如下

<class name="User" table="[User]">
    <id name="UserId" unsaved-value="0">
      <generator class="identity" />
    </id>
    <property name="FirstName" />
    <property name="LastName" />
    <property name="EmailAddress" />
    <property name="DateOfBirth" />
    <property name="Gender" />
    <property name="PostcodePartOne" />
    <property name="PostcodePartTwo" />
    <many-to-one name="UserLocation" column="UserLocationId" />
    <property name="DateJoined" />
    <property name="LastLoggedOn" />
    <property name="Status"/>
    <property name="StatusNotes" />
    <one-to-one name="Profile" class="UserProfile" cascade="all" />
  </class>

<class name="UserProfile" table="UserProfile">
    <id name="UserProfileId" column="UserId">
      <generator class="foreign">
        <param name="property">User</param>
      </generator>
    </id>
    <one-to-one name="User" class="User" constrained="true" />
    <property name="Height" />
    <many-to-one name="BodyType" column="BodyTypeId" />
    <many-to-one name="Ethnicity" column="EthnicityId" />
    <many-to-one name="MaritalStatus" column="MaritalStatusId"/>
    <property name="NumberOfChildren" />
    <many-to-one name="WantsChildren" column="WantsChildrenId" />
    <many-to-one name="Religion" column="ReligionId" />
    <many-to-one name="Drinking" column="DrinkingId" />
    <many-to-one name="Smoking" column="SmokingId" />
    <many-to-one name="Diet" column="DietId" />
    <many-to-one name="Education" column="EducationId" />
    <many-to-one name="Socialising" column="SocialisingId" />
    <many-to-one name="Travelling" column="TravellingId" />
    <many-to-one name="Romance" column="RomanceId" />
    <many-to-one name="SexualOpenness" column="SexualOpennessId" />
    <many-to-one name="SexualFrequency" column="SexualFrequencyId" />
    <many-to-one name="SharedInterests" column="SharedInterestsId" />
    <many-to-one name="TimeWithPartner" column="TimeWithPartnerId" />
    <many-to-one name="Ambition" column="AmbitionId" />
    <many-to-one name="Emigrating" column="EmigratingId" />
    <many-to-one name="FamilyInvolvement" column="FamilyInvolvementId" />
    <property name="LastUpdated" />
    <one-to-one name="ProfileText" class="UserProfileText" cascade="all" />
  </class>

当我尝试进行分离更新时，什么不起作用。我创建了一个新的User和UserProfile对象，将它们与我保存时的引用相互链接，然后将User.UserId分配给我想要更新的已保存用户ID。然后我调用session.merge（用户）但得到以下错误

    Message "Error updating item of type 'User':a different object with the same identifier value was already associated with the session: 153, of entity: UserProfile" string

这是否告诉我，它很乐意合并User对象但由于某种原因无法合并用户配置文件？

我做错了什么？

Answer 1

认为我发现了问题。我正在将UserProfiles“User”属性引用设置为父User对象，但是我没有设置它作为PK的“UserId”属性，因此它认为它属于父用户但仍为其UserId为零标识符。在Profile对象上设置UserId以及User对象工作

Nhibernate合并相关实体

1 个答案: