[英]Fluent NHibernate - HasMany on composite key
如何在没有外键和列名不同的旧数据库上创建HasMany关系? 我知道如何使用References在HeaderVersion上创建一对一关系,但不知道如何从Header 1创建HasMany到* HeaderVersion。 加入条件应该是:
Header.Id1 = HeaderVersion.PId1 AND Header.Id2 = HeaderVersion.PId2
域:
public class Header {
public virtual int Id1 { get; set; }
public virtual int Id2 { get; set; }
public virtual string Something { get; set; }
}
public class HeaderVersion {
public virtual int PId1 { get; set; }
public virtual int PId2 { get; set; }
public virtual int Version { get; set; }
public virtual string SomethingFoo { get; set; }
}
地图:
public HeaderMap() {
Table("Header");
LazyLoad();
CompositeId().KeyProperty(x => x.Id1, "Id1")
.KeyProperty(x => x.Id2, "Id2");
Map(x => x.Something).Column("Something");
}
public HeaderVersionMap() {
Table("HeaderVersion");
LazyLoad();
CompositeId().KeyProperty(x => x.PId1, "PId1")
.KeyProperty(x => x.PId2, "PId2")
.KeyProperty(x => x.Version, "Version");
Map(x => x.SomethingFoo).Column("SomethingFoo");
}
假设Header
是(忽略GetHashCode
和Equals
覆盖)
public class Header
{
public virtual int Id1 { get; set; }
public virtual int Id2 { get; set; }
public virtual string Something { get; set; }
public virtual ICollection<HeaderVersion> Versions { get; set; }
}
HeaderMap
应如下所示:
public class HeaderMap : ClassMap<Header>
{
public HeaderMap()
{
Table("Header");
LazyLoad();
CompositeId().KeyProperty(x => x.Id1, "Id1")
.KeyProperty(x => x.Id2, "Id2");
Map(x => x.Something).Column("Something");
HasMany(x => x.Versions).AsBag().KeyColumns.Add("PId1", "PId2");
// Fetch, Inverse, Cascade depend on your mapping strategy
}
}
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