Fluent NHibernate Mapping a column against one of two columns

问题:

I'm dealing with some legacy vendor code that I can't modify. I'd like to wrap the database with an abstraction layer that is easier to use.

Given the following two tables, I need to create a mapping for Process.Route that will find the matching Route for a given Process, but that can be either dbo.Route.SourceProcessID or dbo.Route.DestinationProcessID:

TABLE [dbo].[Route](     [RouteID] [bigint] IDENTITY(1,1) NOT NULL,     [SourceProcessID] [bigint] NOT NULL,     [DestinationProcessID] [bigint] NOT NULL  TABLE [dbo].[Process](     [ProcessID] [bigint] IDENTITY(1,1) NOT NULL ) 

回答1:

It's not elegant, but I finally came up with the following:

public class Process {     public virtual IList<Route> SourceRoutes { get; set; }     public virtual IList<Route> DestinationRoutes { get; set; } }  public class ProcessOverride : IAutoMappingOverride<Process> {     public void Override(AutoMapping<Process> mapping)     {         mapping.HasMany(proc => proc.SourceRoutes).Table("Routes").KeyColumn("SourceID");         mapping.HasMany(proc => proc.DestinationRoutes).Table("Routes").KeyColumn("DestID");     } } 

文章来源: Fluent NHibernate Mapping a column against one of two columns