我在WCF上有一个C#REST服务,它位于SQL 2008上的EF 4.2框架的顶部。有几个实体,但重要的两个是Trips及其子项PlacesOfInterest。为什么向我的实体框架添加一个子元素尝试插入一个新的父元素?
下面是表:
-- Creating table 'Trips'
CREATE TABLE [dbo].[Trips] (
[Id] uniqueidentifier NOT NULL,
[Name] nvarchar(max) NOT NULL,
[ArrivalDate] datetime NULL,
[DepartureDate] datetime NULL,
[WhereTo] nvarchar(max) NOT NULL,
[CreatedDate] datetime NULL,
[UpdatedDate] datetime NULL,
[Album] nvarchar(max) NOT NULL,
[UserToken] nvarchar(max) NOT NULL,
[WallPostId] nvarchar(max) NOT NULL
);
GO
-- Creating table 'PlacesOfInterest'
CREATE TABLE [dbo].[PlacesOfInterest] (
[Id] uniqueidentifier NOT NULL,
[PhoneNumber] nvarchar(max) NOT NULL,
[SmallPicture] nvarchar(max) NOT NULL,
[LargePicture] nvarchar(max) NOT NULL,
[HostId] nvarchar(max) NOT NULL,
[HostName] nvarchar(max) NOT NULL,
[Address1] nvarchar(max) NOT NULL,
[Address2] nvarchar(max) NOT NULL,
[Address3] nvarchar(max) NOT NULL,
[City] nvarchar(max) NOT NULL,
[State] nvarchar(max) NOT NULL,
[Zip] nvarchar(max) NOT NULL,
[Latitude] bigint NOT NULL,
[Longitude] bigint NOT NULL,
[URL] nvarchar(max) NOT NULL,
[MapUrl] nvarchar(max) NOT NULL,
[Hours] nvarchar(max) NOT NULL,
[Name] nvarchar(max) NOT NULL,
[PageId] nvarchar(max) NOT NULL,
[Trip_Id] uniqueidentifier NOT NULL,
[Category_Id] int NULL
);
GO
这里是我的POCO模型。
public class Trip
{
public Guid Id { get; set; }
public string Name { get; set; }
public DateTime ArrivalDate { get; set; }
public DateTime DepartureDate { get; set; }
public string WhereTo { get; set; }
public DateTime CreatedDate { get; set; }
public DateTime UpdatedDate { get; set; }
public string Album { get; set; }
public List<PlaceOfInterest> PlacesOfInterest { get; set; }
public List<Photo> Photos { get; set; }
public string UserToken { get; set; }
public string WallPostId { get; set; }
}
public class PlaceOfInterest
{
public Guid Id { get; set; }
public string Name { get; set; }
public string PhoneNumber { get; set; }
public string Address1 { get; set; }
public string Address2 { get; set; }
public string Address3 { get; set; }
public string City { get; set; }
public string State { get; set; }
public string Zip { get; set; }
public long Latitude { get; set; }
public long Longitude { get; set; }
public string SmallPicture { get; set; }
public string LargePicture { get; set; }
public string HostId { get; set; }
public string HostName { get; set; }
public string URL { get; set; }
public string MapUrl { get; set; }
public string Hours { get; set; }
public Category Category { get; set; }
public List<Photo> Photos { get; set; }
public List<Checkin> Checkins { get; set; }
public List<PoiAttribute> PoiAttributes { get; set; }
public Guid TripId { get; set; }
public string PageId { get; set; }
[IgnoreDataMember]
public Trip Trip { get; set; }
}
当我添加一个新的PlaceOfInterest时,实体框架试图插入一个列表,并且我得到一个重复的键错误。
public static Guid Create(string tripId, Model.PlaceOfInterest instance)
{
var context = new Model.POCOTripContext();
var cleanPoi = new Model.PlaceOfInterest();
cleanPoi.Id = Guid.NewGuid();
cleanPoi.Address1 = instance.Address1;
cleanPoi.Address2 = instance.Address2;
cleanPoi.Address3 = instance.Address3;
cleanPoi.City = instance.City;
cleanPoi.HostId = instance.HostId;
cleanPoi.HostName = instance.HostName;
cleanPoi.Hours = instance.Hours;
cleanPoi.LargePicture = instance.LargePicture;
cleanPoi.Latitude = instance.Latitude;
cleanPoi.Longitude = instance.Longitude;
cleanPoi.MapUrl = instance.MapUrl;
cleanPoi.Name = instance.Name;
cleanPoi.PageId = instance.PageId;
cleanPoi.PhoneNumber = instance.PhoneNumber;
cleanPoi.SmallPicture = instance.PhoneNumber;
cleanPoi.State = instance.State;
cleanPoi.Trip = Library.Trip.Get(new Guid(tripId));
cleanPoi.URL = instance.URL;
cleanPoi.Zip = instance.Zip;
context.PlacesOfInterest.AddObject(cleanPoi);
context.SaveChanges();
return cleanPoi.Id;
}
我不希望它插入那个行程,我只是想要它更新数据库中的TripId列。我究竟做错了什么?
不应该这个'context.PlacesOfInterest.Attach(cleanPoi.Trip);'是'context.Trips.Attach(cleanPoi.Trip);'? – cadrell0 2012-03-28 20:50:39
@ cadrell0:当然可以:)谢谢,现在已经修好了。 – Slauma 2012-03-28 20:53:36
这个工作,但是当我到达SaveChanges时,数据库插入炸弹:{“不能将NULL值插入到'Id'列'PersonalAssistant.dbo.PlacesOfInterest'列中;列不允许空值,INSERT失败。\ r \ n该语句已被终止。“} ID字段填充在cleanPoi和上下文对象中。想法? – 2012-03-29 00:05:20