流畅的 NHibernate 映射 - 复合键
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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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.