NHibernate多列ManyToOne映射与映射副代码

时间:2013-06-18 10:01:04

标签: nhibernate many-to-one mapping-by-code

我正在尝试使用NHibernate 3.3.3将我的FluentNHibernate映射转换为NHibernate Mapping By-code。目标是升级到NHibernate 3.3.3并减少分发的程序集数量。

然而,当我编译并运行时,我得到以下异常:

  

NHibernate.MappingException:无法通过单列API映射多列属性。

XML映射FluentNHibernate看起来像这样:

<many-to-one cascade="none" class="TextDto" fetch="join" lazy="false" name="Name" not-found="ignore">
  <column name="NameTextId" unique="false" />
  <column name="LanguageId" unique="false" />
</many-to-one>

这是我的新代码映射:

this.ManyToOne(u => u.Name, c =>
{
    c.Cascade(Cascade.None);
    c.Class(typeof(TextDto));
    c.Columns(
        x =>
        {
            x.Name("NameTextId");
            x.Unique(false);
        },
        x =>
        {
            x.Name("LanguageId");
            x.Unique(false);
        });
    c.Fetch(FetchKind.Join);
    c.Lazy(LazyRelation.NoLazy);
    c.NotFound(NotFoundMode.Ignore);
    c.Unique(false);
});

这是旧的FluentNHibernate映射:

References(x => x.Name)
    .Columns("NameTextId", "LanguageId")
    .Cascade.None()
    .Fetch.Join()
    .NotFound.Ignore()
    .Not.Unique()
    .Not.LazyLoad();

完整性涉及的属性类型:

public class TextDto
{
    public TextCompositeId Id { get; set; }
    public string PluralText { get; set; }
    public string SingularText { get; set; }
    public override bool Equals(object obj)
    {
        var text = (TextDto)obj;
        if (text == null) return false;
        return this.Id.Equals(text.Id);
    }
    public override int GetHashCode()
    {
        return this.Id.GetHashCode();
    }
}

实体中属性的一个示例:

public class CharacteristicValue
{
    public CharacteristicValueCompositeId Id { get; set; }
    public TextDto Name { get; set; }
    public string LanguageIdentity { get; set; }
    public string Value
    {
        get
        {
            string value = null;
            if (this.ValueMultilingual != null) return this.ValueMultilingual.SingularText;
            else if (!string.IsNullOrEmpty(this.ValueMeta)) return this.ValueMeta;
            return value;
        }
    }
    public TextDto ValueMultilingual { get; set; }
    public string ValueMeta { get; set; }
    public override bool Equals(object obj)
    {
        if (obj == null) return false;
        if (object.ReferenceEquals(this, obj)) return true;
        CharacteristicValue characteristicValue = obj as CharacteristicValue;
        if (characteristicValue == null) return false;
        if (this.Id != characteristicValue.Id) return false;
        return true;
    }
    public override int GetHashCode()
    {
        return this.Id.GetHashCode();
    }
}

那么,我如何获得我以前使用FluentNHibernate获取的xml-mapping,但使用NHiberbate的Mapping By-Code映射?

1 个答案:

答案 0 :(得分:2)

在您的映射中,从c.Unique(false);映射中删除ManyToOne。这个设置我们现在适用于每一列。

this.ManyToOne(u => u.Name, c =>
{
    ... // the same as above

    // c.Unique(false); // it is setting now related to columns
});

你会收到

<many-to-one name="Name" class="TextDto" fetch="join" lazy="false" not-found="ignore">
  <column name="NameTextId" unique="true" />
  <column name="LanguageId" />
</many-to-one>

如果您要更改其中一列的唯一性:

x =>
{
    x.Name("NameTextId");
    x.Unique(true); // change here
},

唯一约束将添加到该列:

<column name="NameTextId" unique="true" />