流畅的 NHibernate 映射 - 复合键

发布于 2024-09-08 02:19:53 字数 2887 浏览 4 评论 0原文

我正在尝试在 FNH 中映射以下表/实体,但似乎一无所获!

**Tables**
Contacts
    ID (PK - int - generated)
    ...

PhoneTypes
    ID (PK - varchar - assigned) (e.g. MOBILE, FAX)

ContactPhones
    ContactRefId    (PK - FK to Contacts)
    PhoneTypeRefId  (PK - FK to PhoneTypes)
    ...

(我应该注意,我也在使用 S#arp 架构框架)

**Entities**
public class Contact : Entity
{
    (The ID property is defined in the Entity base class and is type int)

    public virtual ICollection<ContactPhone> PhoneNumbers { get; set; }
}

public class PhoneType : EntityWithTypedId<string>, IHasAssignedId<string>
{
    (The ID property is defined in the base class and is type string)

    ....
}

public class ContactPhone : EntityWithTypedId<ContactPhoneId>, IHasAssignedId<ContactPhoneId>
{
    public virtual Contact Contact { get; set; }

    public virtual PhoneType PhoneType { get; set; }
    ....
}

我读到,在使用复合 id 时,建议将复合 id 分离到不同的类中。 hibernate 复合键

public class ContactPhoneId : EntityWithTypedId<ContactPhoneId>, IHasAssignedId<ContactPhoneId>
{
    public virtual Contact Contact { get; set; }

    public virtual PhoneType PhoneType { get; set; }
}
...I could just make this class serializable and override 
Equals and GetHashCode myself instead of using the S#arp Arch base class.

我已经尝试了很多映射组合,现在我完全使困惑。

这是我的最新镜头:

public class ContactMap : IAutoMappingOverride<Contact>
{
    public void Override(AutoMapping<Contact> mapping)
    {
        mapping.HasMany<ContactPhone>(x => x.PhoneNumbers)
            .KeyColumns.Add("ContactRefId")
            .KeyColumns.Add("PhoneTypeRefId")
            .AsSet()
            .Inverse()
            .Cascade.All();
    }
}


public class PhoneTypeMap : IAutoMappingOverride<PhoneType>
{
    public void Override(AutoMapping<PhoneType> mapping)
    {
        mapping.Id(x => x.Id).Column("Id").GeneratedBy.Assigned();
    }
}


public class ContactPhoneMap : IAutoMappingOverride<ContactPhone>
{
    public void Override(AutoMapping<ContactPhone> mapping)
    {
        mapping.Table("ContactPhones");
        mapping.CompositeId<ContactPhoneId>(x => x.Id)
            .KeyReference(y => y.Contact, "ContactRefId")
            .KeyReference(y => y.PhoneType, "PhoneTypeRefId");
    }
}  

在尝试生成映射时,我抛出了许多异常,其中最新的是:

Foreign key (FK672D91AE7F050F12:ContactPhones [ContactRefId, PhoneTypeRefId])) 
must have same number of columns as the referenced primary key (Contacts [Id])

有人看到任何明显的我做错的事情吗?我是 NH 和 FNH 的新手,从这篇文章中可以明显看出这一点。 :-) 另外,有人在使用 S#arp 架构时使用过这样的复合 Id 吗?最佳实践是什么(除了使用代理键:-))?

非常感谢……对这么长的帖子感到抱歉。

I'm trying to map the following tables/entities in FNH and seem to be getting nowhere fast!

**Tables**
Contacts
    ID (PK - int - generated)
    ...

PhoneTypes
    ID (PK - varchar - assigned) (e.g. MOBILE, FAX)

ContactPhones
    ContactRefId    (PK - FK to Contacts)
    PhoneTypeRefId  (PK - FK to PhoneTypes)
    ...

(I should note that I am also using the S#arp Architecture framework)

**Entities**
public class Contact : Entity
{
    (The ID property is defined in the Entity base class and is type int)

    public virtual ICollection<ContactPhone> PhoneNumbers { get; set; }
}

public class PhoneType : EntityWithTypedId<string>, IHasAssignedId<string>
{
    (The ID property is defined in the base class and is type string)

    ....
}

public class ContactPhone : EntityWithTypedId<ContactPhoneId>, IHasAssignedId<ContactPhoneId>
{
    public virtual Contact Contact { get; set; }

    public virtual PhoneType PhoneType { get; set; }
    ....
}

I read that it is advisable when working with composite ids, to separate the composite id into a different class.
hibernate composite key

public class ContactPhoneId : EntityWithTypedId<ContactPhoneId>, IHasAssignedId<ContactPhoneId>
{
    public virtual Contact Contact { get; set; }

    public virtual PhoneType PhoneType { get; set; }
}
...I could just make this class serializable and override 
Equals and GetHashCode myself instead of using the S#arp Arch base class.

I've tried so many combinations of mappings that I'm now completely confused.

This is my latest shot:

public class ContactMap : IAutoMappingOverride<Contact>
{
    public void Override(AutoMapping<Contact> mapping)
    {
        mapping.HasMany<ContactPhone>(x => x.PhoneNumbers)
            .KeyColumns.Add("ContactRefId")
            .KeyColumns.Add("PhoneTypeRefId")
            .AsSet()
            .Inverse()
            .Cascade.All();
    }
}


public class PhoneTypeMap : IAutoMappingOverride<PhoneType>
{
    public void Override(AutoMapping<PhoneType> mapping)
    {
        mapping.Id(x => x.Id).Column("Id").GeneratedBy.Assigned();
    }
}


public class ContactPhoneMap : IAutoMappingOverride<ContactPhone>
{
    public void Override(AutoMapping<ContactPhone> mapping)
    {
        mapping.Table("ContactPhones");
        mapping.CompositeId<ContactPhoneId>(x => x.Id)
            .KeyReference(y => y.Contact, "ContactRefId")
            .KeyReference(y => y.PhoneType, "PhoneTypeRefId");
    }
}  

I've had many exceptions thrown when trying to generate the mappings, the latest of which is:

Foreign key (FK672D91AE7F050F12:ContactPhones [ContactRefId, PhoneTypeRefId])) 
must have same number of columns as the referenced primary key (Contacts [Id])

Does anyone see anything obvious that I'm doing wrong? I'm new to NH and FNH, which may be obvious from this post. :-) Also, has anyone used Composite Ids like this while using S#arp Architecture? What are the best practices (other than to use surrogate keys :-) ) ?

Many thanks...and sorry about the long post.

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似梦非梦 2024-09-15 02:19:53

我也有多对多的关系。我的设置如下:

mapping.HasManyToMany(x => x.Artists).Cascade.All().Inverse().Table("ArtistImages");

ArtistImages 表有表 Artists 和 Images 的主键。

I have a many to many relationship too. I've got mine setup like this:

mapping.HasManyToMany(x => x.Artists).Cascade.All().Inverse().Table("ArtistImages");

The ArtistImages table has primary keys for tables Artists and Images.

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