Question

我无法弄清楚如何使用Nhibernate 3.0

来使我的映射更正确

我有两个POCO：

public class Account
{
    public virtual string AccountNumber { get; set; }

    public virtual IList<AccountSummary> AccountSummaries { get; set; }
}

public class AccountSummary
{
    public virtual uint Id { get; protected set; }

    public virtual string AccountNumber { get; set; }

    public virtual DateTime TradeDate { get; set; }
}

我想在这样的表中映射类：

表：帐户（列：account_number）

表：account_summaries（列：id，列：trade_date，列：account_number）

如何避免在AccountSummary类中使用Account对象，就像我通常使用一对多/多对一映射一样。而不是我的AccountSummary类具有Account对象，我希望AccountSummary类具有AccountNumber属性，如在类定义中引用Account类。

我还想将trade_date和account_number列映射为natural-id或unique-key。

我的映射看起来像这样：

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                           assembly="FundAccountDBExperiment"
                           namespace="FundAccountDBExperiment.Models">
  <class name="Account" table="accounts">
    <composite-id>
      <key-property name="AccountNumber" column="account_number" length="40"/>
    </composite-id>
    <bag name="AccountSummaries" table="account_summaries" cascade="all-delete-orphan" inverse="true">
      <key column="account_number"/>
      <one-to-many class="AccountSummary"/>
    </bag>
  </class>
</hibernate-mapping>

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                            assembly="FundAccountDBExperiment"
                            namespace="FundAccountDBExperiment.Models">
  <class name="AccountSummary" table="account_summaries">
    <id name="Id" column="id">
      <generator class="native"/>
    </id>
    <property name="TradeDate" column="trade_date" type="date" not-null="true"/>
    <join table="account">
      <key column="acount_number"/>
    </join>
  </class>
</hibernate-mapping>

任何形式的帮助都将受到赞赏。

Answer 1

这不够吗？

public class AccountSummary
{
    public virtual uint Id { get; protected set; }

    public virtual Account Account { get; set; }

    public virtual string AccountNumber
    {
        get { return Account.AccountNumber; }
        set { Account.AccountNumber = value; }
    }

    public virtual DateTime TradeDate { get; set; }
}

，唯一约束见“myUniqueIndex”

  <class name="AccountSummary" table="account_summaries">
    <id name="Id" column="id">
      <generator class="native"/>
    </id>
    <property name="TradeDate" column="trade_date" type="date" not-null="true" index="myUniqueIndex" />
    <many-to-one column="acount_number" lazy="false" index="myUniqueIndex">
  </class>

希望这会有所帮助

NHibernate映射问题

1 个答案: