我在预订和联系人之间存在多对多关系,当我尝试将新联系人添加到预订时,会发生以下错误。
_db.Reservations.Add(reservation);
reservation.Contacts.Add(user.Contact);
_db.SaveChanges();
我认为我的表定义存在一些问题,所以我复制了我的表的粘贴创建脚本。我在reservaion_contact 表中同时设置了reservaionId 和contactId 主键。这是错的吗?我的表结构:
CREATE TABLE [dbo].[Reservation_Contacts](
[Reservation_Id] [int] NOT NULL,
[Contact_Id] [int] IDENTITY(1,1) NOT NULL,
CONSTRAINT [PK_Reservation_Contacts] PRIMARY KEY CLUSTERED
(
[Reservation_Id] ASC,
[Contact_Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[Reservation_Contacts] WITH CHECK ADD CONSTRAINT [FK_Reservation_Contacts_Contact] FOREIGN KEY([Contact_Id])
REFERENCES [dbo].[Contact] ([Id])
GO
ALTER TABLE [dbo].[Reservation_Contacts] CHECK CONSTRAINT [FK_Reservation_Contacts_Contact]
GO
ALTER TABLE [dbo].[Reservation_Contacts] WITH CHECK ADD CONSTRAINT [FK_Reservation_Contacts_Reservation] FOREIGN KEY([Reservation_Id])
REFERENCES [dbo].[Reservation] ([Id])
GO
ALTER TABLE [dbo].[Reservation_Contacts] CHECK CONSTRAINT [FK_Reservation_Contacts_Reservation]
GO