Question

我首先使用代码和实体类型配置来映射我的类。

我有一个用户类

public class User
{
public virtual UserData UserData { get; set; }

public Guid UserId { get; set; }
public string UserName { get; set; }
public virtual string PasswordHash { get; set; }
public virtual string SecurityStamp { get; set; }
public string Email { get; set; }

这是一个用户表。 UserData - 将是一个表包含UserData作为Name，LastName等。

我想将UserId用作Forgein Key one-to-zer-or-one。对于一个用户，将只有一个UserData

public class UserData
{

public long Id { get; set; }
public Guid UserId { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }

public virtual User User { get; set; }
}

但无法弄清楚如何进行映射

internal UserConfiguration()
{
ToTable("User");

HasKey(x => x.UserId)
    .Property(x => x.UserId)
    .HasColumnName("UserId")
    .HasColumnType("uniqueidentifier")
    .IsRequired();

... properties mapping



HasOptional(x => x.UserData).
    WithRequired(x => x.User); ?? is this ok?
}

和UserData

internal UserDataConfiguration()
        {
            ToTable("UserData");

            HasKey(x => x.Id)
                .Property(x => x.Id)
                .HasColumnName("Id")
                .HasColumnType("bigint")
                .IsRequired();

            Property(x => x.FirstName)
                .HasColumnName("FirstName")
                .HasColumnType("nvarchar")
                .HasMaxLength(255);

            Property(x => x.LastName)
                .HasColumnName("LastName")
                .HasColumnType("nvarchar");

            Property(x => x.UserId)
                .HasColumnName("UserId")
                .HasColumnType("uniqueidentifier")
                .IsRequired();
            ?? is this ok?


        }

Answer 1

对于User中的UserConfiguration()来映射一对一或一对一关系，您可以将其定义为：

HasOptional(x => x.UserData).WithRequired(x => x.User);

Answer 2

对于Entity Framework中的1：0..1关系，可选端的主键也是外键，因此您可以这样设置：

UserConfiguration()
{
    ToTable("User");

    HasKey(x => x.UserId)
    Property(x => x.UserId)
        .HasColumnName("UserId")
        .HasColumnType("uniqueidentifier")
        .IsRequired();

    // you could define the relationship here as well, I moved it 
    // to UserDataConfiguration to make it easier to explain

    // other properties
}

UserDataConfiguration()
{
    ToTable("UserData");

    HasKey(x => x.UserId);

    Property(x => x.UserId)
        .HasColumnName("UserId")
        .HasColumnType("uniqueidentifier")
        .IsRequired();

    // This makes UserData's primary key the foreign key by default
    HasRequired(x => x.User).WithOptional(x => x.UserData);

    // other properties
}

UserData无法使用单独的主键。

实体类型配置// Fluent API - 映射 - 零到一个foreignKey

2 个答案: