我有两张桌子-
1. Account
2. Users
在Account
表中,DefaultExpensePartner
和是表字段的AccountOwner
外键。我已经定义了如下类。UserId
Users
public class Account
{
public int AccountId { get; set; }
public string AccountName { get; set; }
public int? AccountOwnerId { get; set; }
public int? DefaultExpensePartnerId { get; set; }
public virtual Users AccountOwner { get; set; }
public virtual Users DefaultExpensePartner { get; set; }
}
public class AccountConfiguration : EntityTypeConfiguration<Account>
{
public AccountConfiguration()
{
this.ToTable("Account");
this.HasKey(c => c.AccountId);
this.Property(c => c.AccountId)
.HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity)
.IsRequired();
this.Property(c => c.AccountName)
.HasMaxLength(50)
.IsRequired();
this.Property(c => c.AccountOwnerId)
.HasColumnName("AccountOwner")
.IsOptional();
this.Property(c => c.DefaultExpensePartnerId)
.HasColumnName("DefaultExpensePartner")
.IsOptional();
this.HasRequired(c => c.DefaultExpensePartner)
.WithMany()
.HasForeignKey(c => c.DefaultExpensePartnerId)
.WillCascadeOnDelete(false);
this.HasRequired(c => c.AccountOwner)
.WithMany()
.HasForeignKey(c => c.AccountOwnerId)
.WillCascadeOnDelete(false);
}
}
public class Users
{
public int UserId { get; set; }
public string Email { get; set; }
public string DisplayName { get; set; }
public string PasswordSalt1 { get; set; }
public string PasswordSalt2 { get; set; }
public string PasswordHash { get; set; }
}
public class UsersConfiguration : EntityTypeConfiguration<Users>
{
public UsersConfiguration()
{
this.ToTable("Users");
this.HasKey(c => c.UserId);
this.Property(c => c.UserId)
.HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity)
.IsRequired();
this.Property(c => c.Email)
.HasMaxLength(80)
.IsRequired();
this.Property(c => c.DisplayName)
.HasMaxLength(50)
.IsRequired();
this.Property(c => c.PasswordSalt1)
.HasMaxLength(172)
.IsRequired();
this.Property(c => c.PasswordSalt2)
.HasMaxLength(172)
.IsRequired();
this.Property(c => c.PasswordHash)
.HasMaxLength(40)
.IsRequired();
}
}
虽然我能够为AccountOwner
和DefaultExpensePartner
字段建立外键关系,但它们在数据库中被定义为非空,这根据我的原始计划是不正确的。谁能知道如何将外键定义为可为空的?