Question

我有一个与a具有一对多关系的Vessel对象 VesselDetail对象。当我将VesselDetail对象添加到Vessel对象并尝试保存Vessel对象时，似乎NHibernate在插入VesselDetail对象时不添加外键。

我在哪里错了？我只是想不出来。

错误讯息： BDN.FindVessel.Tests.Integration.NhibernateRepositoryTests.SaveVessel_ShouldAddDetailsToDb_WhenAddedToEntity： NHibernate.Exceptions.GenericADOException：无法插入：[BDN.FindVessel.Domain.VesselDetail] [SQL：INSERT INTO BoatsDetails（SaftyGear，OtherMachineryAndGear，Material，Size，Various，TranslatorId，SpeenAndConsumption，MainMachinery，Created，Class，Capasities，Culture，内部，电子，DeckGear）VALUES（？，？，？，？，？，？，？，？，？，？，？，？，？，？，？）;选择SCOPE_IDENTITY（）] ----＆GT; System.Data.SqlClient.SqlException：无法将值NULL插入列'BoatId'，表'FindVesselTest.dbo.BoatsDetails';列不允许空值。 INSERT失败。声明已经终止。

public class Vessel
{
        public virtual int BoatId { get; set; }
        public virtual IList<VesselDetail> Details { get; set; }
        //...
}

public class VesselDetail
{
        public virtual int VesselDetailId { get; set; }
        //some other properties
        //..
}

public class VesselMap: ClassMap<Vessel>
{
    public VesselMap()
    {
        WithTable("Boats");

        Id(x => x.BoatId, "Id");

        //..

        HasMany(x => x.Details)
            .WithKeyColumn("BoatId") //foreign key in the BoatsDetails table
            .Cascade.All();
    }
}

public class VesselDetailMap:ClassMap<VesselDetail>
{
  public VesselDetailMap()
  {
      WithTable("BoatsDetails");

      Id(x => x.VesselDetailId, "Id");

      //...
  }
}

Answer 1

我似乎缺少一些基本的NHibernate技能。稍微阅读一下，似乎你需要让子对象负责一对多的关系。

这解决了我的问题：

public class VesselMap: ClassMap<Vessel>
{
    public VesselMap()
    {
        //...

        HasMany(x => x.Details)
                .Inverse()
                .WithKeyColumn("BoatId");
    }
}

public class VesselDetailMap:ClassMap<VesselDetail>
{
  public VesselDetailMap()
  {
      //..

       References(x => x.Vessel, "BoatId")
                .Cascade
                .SaveUpdate();
  }
}

NHibernate一对多的问题

1 个答案: