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我对 NHibernate 很陌生,我遇到了这个问题,我需要扩展表中的两列出现在<joined-subclass>我的 NHibernate 映射中,但是我很难找到合适的实现。

下面是我的实现的简化版本,我最初认为这是完成我需要的方法,但 NHibernate 不允许<join><joined-subclass>.

  <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                     assembly="Sample.NHibernate"
                     namespace="Sample.NHibernate.ProgramAssociationAggregate"
                     default-access="property">

  <!-- Class definition -->
  <class name="ProgramAssociation" table="ProgramAssociation" lazy="false">

    <!-- Composite primary key -->
    <composite-id>
      <key-property name="BeginDate" column="BeginDate" type="date" />
      <key-property name="OrganizationId" column="OrganizationId" type="int" />
      <key-property name="ProgramName" column="ProgramName" type="string" length="60" />
      <key-property name="ProgramTypeId" column="ProgramTypeId" type="int" />
      <key-property name="PersonId" column="PersonId" type="int" />
    </composite-id>

    <!-- Optimistic locking for aggregate root -->
    <version name="LastModifiedDate" column="LastModifiedDate" type="timestamp" />

    <!-- Transient state detection -->
    <property name="CreateDate" column="CreateDate" type="DateTime" not-null="true" />

    <!-- Unique Guid-based identifier for aggregate root -->
    <property name="Id" column="Id" type="guid" not-null="true" />

    <!-- Properties -->
    <property name="EndDate" column="EndDate" type="date" />

    <!-- Derived classes -->
    <joined-subclass name="Sample.NHibernate.ProgramAssociationAggregate.SpecialProgramAssociation" table="SpecialProgramAssociation" lazy="false">
      <key>
        <column name="BeginDate" />
        <column name="OrganizationId" />
        <column name="ProgramName" />
        <column name="ProgramTypeId" />
        <column name="PersonId" />
      </key>

      <!-- PK properties -->
      <property name="PersonId" column="PersonId" type="int" not-null="true" insert="false" />
      <property name="ProgramTypeId" column="ProgramTypeId" type="int" not-null="true" insert="false" />
      <property name="BeginDate" column="BeginDate" type="date" not-null="true" insert="false" />
      <property name="ProgramName" column="ProgramName" type="string" length="60" not-null="true" insert="false" />
      <property name="OrganizationId" column="OrganizationId" type="int" not-null="true" insert="false" />

      <!-- Properties -->
      <property name="IEPReviewDate" column="IEPReviewDate" type="date" />
      <property name="IEPBeginDate" column="IEPBeginDate" type="date" />
      <property name="IEPEndDate" column="IEPEndDate" type="date" />

      <!-- Trying to join this table, but NHibernate does not allow for this. What is the best way to accomplish essentially the same thing? -->
      <join table="SpecialProgramAssociationExtension" schema="extension">
        <key>
          <column name="BeginDate" />
          <column name="OrganizationId" />
          <column name="ProgramName" />
          <column name="ProgramTypeId" />
          <column name="PersonId" />
        </key>
        <property name="IEPEventCode"/>
        <property name="WrittenConsentDate" type="date"/>
      </join>

    </joined-subclass>

  </class>
</hibernate-mapping>

有没有对 NHibernate 有更多经验的人知道完成我需要的方法?

我最近一直在这里使用这个 NHibernate 资源,但它并没有证明对这种困境非常有用。

任何可以指出我的提示或资源将不胜感激。

谢谢你。

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1 回答 1

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你可以:

  • 更改类模型以使扩展具有另一个类并将其映射为一对一。
  • 更改数据库以将值存储在 SpecialProgramAssociation
  • 使用子类映射而不是连接子类并连接到 SpecialProgramAssociation 表并从那里连接到扩展。这也需要更改数据库模型,因为您需要一个鉴别器。
于 2016-05-25T10:25:25.110 回答