地图关系实体框架出错

Question

I'm having trouble creating a solution to this business rule.

I currently have 1 client, 1 correspondent and 1 store. Both use the same address table. As the client, correspondent, and store tables can not have the auto-generated Id, I have decided to use GUIDs to avoid duplicate errors in the Address table. In this case the address table should look like this:

AddressId  - ReferenceId          - Street
1          - GuidOfCorrespondent  - St. one
2          - GuidOfStore          - St. two
3          - GuidOfCustomer       - St. three

But I'm having trouble mapping entities. Here's the template I'm trying to do:

AddressMap() 
{
    HasKey(x => x.AddressId);

    Property(x => x.Street)
        .IsRequired()
        .HasMaxLength(60);

    Property(x => x.Number)
        .IsRequired();

    HasRequired(x => x.Correspondent)
        .WithMany(x => x.Adresses)
        .HasForeignKey(x => x.ReferenceId);

    HasRequired(x => x.Customer)
        .WithMany(x => x.Adresses)
        .HasForeignKey(x => x.ReferenceId);

    HasRequired(x => x.Store)
        .WithMany(x => x.Adresses)
        .HasForeignKey(x => x.ReferenceId);
    }

I'm getting this error:

The INSERT statement conflicted with the FOREIGN KEY constraint \\"FK_dbo.Address_dbo.Customer_ReferenceId\\". The conflict occurred in database \\"Correspondent\\", table \\"dbo.Customer\\", column 'StoreId'

Can someone help?

Answer 1

尝试在插入地址之前插入所有子实体

Answer 2

If the Correspondent has a navigation property of Address then you can populate the Address at the same time as you populate the Correspondent. Just leave the AddressId on the Correspondent and the AddressId on the Address as zero.

Then when you as enity framework to insert the Correspondent, it will insert the Address record first, then populate the AddressId on the Correspondent before then inserting the Correspondent record.

Answer 3

在这种情况下，您可能同时插入了客户和地址，您只需插入地址，保存更改然后插入客户，还可以使sql对外键约束不敏感，并且如果要插入实体，则使外键列为nullabe在子实体之前