Question

亲爱的程序员，

我在EF中坚持这个基本概念，无法在stackoverflow上找到任何解决方案。

我希望在FluxLocation和Address之间建立一对一的可选关系。（正常词：通量位置可以提供物理地址）

请注意，数据库已存在并且是最终的。

SQL TABLES：

CREATE TABLE sales.sales_flux_location(
id serial PRIMARY KEY,
 -- Many unusefull properties 
sales_address_id integer REFERENCES sales_address
);

CREATE TABLE sales.sales_address(
id serial PRIMARY KEY,
 -- Many unusefull properties 
);

EF Mapping：

 public partial class FluxLocation
{
    public int Id { get; set; }

    //Many unusefull properties.

    [ForeignKey("Address")]
    public int? AddressId { get; set; }
    public Address Address { get; set; }
}

internal partial class FluxLocationConfiguration :    EntityTypeConfiguration<FluxLocation>
{
    public FluxLocationConfiguration()
    {
        //PK
        HasKey(x => x.Id);
        ToTable("sales_flux_location", "sales");
        Property(a => a.Id)
            .HasColumnName("id")
            .HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
        //FK
        HasOptional(l => l.Address)
            .WithOptionalDependent(a => a.FluxLocation);
        Property(l => l.AddressId)
            .HasColumnName("sales_address_id")
            .IsOptional();


   // + mapping other properties.
 }

public partial class Address
{
    public int Id { get; set; }

    // other properties

    public FluxLocation FluxLocation { get; set; }
}

internal partial class AddressConfiguration : EntityTypeConfiguration<Address>
{
    public AddressConfiguration()
    {
        //PK
        HasKey(a => a.Id);
        ToTable("sales_address", "sales");
        Property(a => a.Id)
            .HasColumnName("id")
            .HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
        //FK
        HasOptional(a => a.FluxLocation).WithOptionalPrincipal(l=>l.Address);

        // mapping many unusefull properties 

}

测试案例：

var dbAddress = Context.AddressSet.Add(new Address {Country = "BEL", CityName="Brussel", Street = Guid.NewGuid().ToString() });
var dbLocation = Context.FluxLocationSet.Add(new FluxLocation { AddressId = dbAddress.Id, Country = "BEL", Type = "MARKET", ExtId = Guid.NewGuid().ToString() });
Context.SaveChanges();

Context.SaveChanges（）出错：

＆＃34; 42703：column \＆＃34; Address_Id \＆＃34; of＆＃34; sales_flux_location \＆＃34;不存在＆＃34;}

这是正确的，因为列名是＆＃34; sales_address_id＆＃34;。如果任何人可以帮助他为什么忽略了有利的列名映射？如果需要，我很乐意提供更多代码。

Answer 1

EF没有提到你想要sales_address_id作为FK，所以它试图创建Address_Id。此外，EF有0:1的方式有些奇怪 - 基本上你需要用1:M

来欺骗它

所以试试这个：

//FK
HasOptional(l => l.Address)
    .WithMany()
    .HasForeignKey(d => d.AddressId);

Link

一对一数据库第一EF

1 个答案: