Question

我有以下型号：

public class ExchangeRate
{
    [Key, Column(Order = 1)]
    public virtual int JobId { get; set; }

    [Key, Column(Order = 2), MaxLength(3)]
    public virtual Currency Source { get; set; }

    [Key, Column(Order = 3), MaxLength(3)]
    public virtual Currency Target { get; set; }

    public virtual decimal Rate { get; set; }

    public virtual Job Job { get; set; }

    public override bool Equals(object obj)
    {
        if (obj == null)
            return false;

        var t = obj as ExchangeRate;

        if (t == null)
            return false;

        if (this.Job == t.Job & this.Source == t.Source && this.Target == t.Target)
            return true;

        return false;
    }

    public override int GetHashCode()
    {
        return (this.JobId + "|" + this.Source + "|" + this.Target).GetHashCode();
    }

我有以下AutoMapping覆盖：

public void Override(AutoMapping<ExchangeRate> mapping)
{
    mapping.Map(x => x.Source).CustomType<GenericEnumMapper<Currency>>();
    mapping.Map(x => x.Target).CustomType<GenericEnumMapper<Currency>>();

    // Define the composite key
    mapping.CompositeId()
        .KeyProperty(e => e.JobId, "JobId")
        .KeyProperty(e => e.Source)
        .KeyProperty(e => e.Target);
}

我导出的以下导出的映射文件试图帮助诊断问题：

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
  <class xmlns="urn:nhibernate-mapping-2.2" name="JFS.Data.Model.ExchangeRate, JFS.Data, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" table="ExchangeRates">
    <composite-id>
      <key-property name="JobId" type="System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
        <column name="JobId" />
      </key-property>
      <key-property name="Source" type="FluentNHibernate.Mapping.GenericEnumMapper`1[[JFS.Data.Currency, JFS.Data, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], FluentNHibernate, Version=1.3.0.717, Culture=neutral, PublicKeyToken=8aa435e3cb308880">
        <column name="Source" />
      </key-property>
      <key-property name="Target" type="FluentNHibernate.Mapping.GenericEnumMapper`1[[JFS.Data.Currency, JFS.Data, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], FluentNHibernate, Version=1.3.0.717, Culture=neutral, PublicKeyToken=8aa435e3cb308880">
        <column name="Target" />
      </key-property>
    </composite-id>
    <property name="Source" type="FluentNHibernate.Mapping.GenericEnumMapper`1[[JFS.Data.Currency, JFS.Data, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], FluentNHibernate, Version=1.3.0.717, Culture=neutral, PublicKeyToken=8aa435e3cb308880">
      <column name="Source" />
    </property>
    <property name="Target" type="FluentNHibernate.Mapping.GenericEnumMapper`1[[JFS.Data.Currency, JFS.Data, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], FluentNHibernate, Version=1.3.0.717, Culture=neutral, PublicKeyToken=8aa435e3cb308880">
      <column name="Target" />
    </property>
    <property name="Rate" type="System.Decimal, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
      <column name="Rate" />
    </property>
    <many-to-one class="JFS.Data.Model.Job, JFS.Data, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" name="Job">
      <column name="JobId" />
    </many-to-one>
  </class>
</hibernate-mapping>

我现在大部分时间都在撕扯我的头发，试图解决这个问题但没有成功。我阅读了很多帖子，但未能成功应用任何解决方案。我对NHibernate相对较新，并且热衷于开始更多地使用它，但到目前为止，已经证明了一个非常陡峭的学习曲线来启动和运行项目。任何关于错误的解决方案和解释的建议都将不胜感激。

Answer 1

对于属于主键的多对一关系，请使用KeyReference代替KeyPropery。

.KeyReference(e => e.Source)
.KeyReference(e => e.Target);

具有Count = 4的此SqlParameterCollection的索引4无效

1 个答案: