EF6并不总是生成FK引用

时间:2014-11-26 20:56:34

标签: c# entity-framework

我正在使用实体框架6 ,当我从数据库逆向工程我的架构时,我发现没有生成多个FK关系。它让我疯了。如果我手动添加它们,我会在尝试插入时开始获取密钥违规错误。把它们带回去,一切正常。

架构:DB Schema

当我查看我的RemarketingCase对象时,我没有看到地址,债务人或Notes的任何集合,也没有参考资产或摘要。然而,当我查看Status对象时,我有一个ICollection RecordHistories / CaseHistories。我查看历史表,我参考了Status表,但没有引用RemarketingCase表。

这真是令人厌烦,因为我正在尝试处理那些不存在的对象图!它迫使我通过一次一个地按照正确的顺序处理RemarketingCase及其所有关系的添加,因此SQL不会弹出参照完整性错误。

带FK参考的样本(由EF生成):

public partial class Status
{
    public Status()
    {
        this.CaseHistories = new List<CaseHistory>();
    }

    public int Id { get; set; }
    public string Title { get; set; }
    public string Description { get; set; }
    public virtual ICollection<CaseHistory> CaseHistories { get; set; }
}
public class StatusMap : EntityTypeConfiguration<Status>
{
    public StatusMap()
    {
        // Primary Key
        this.HasKey(t => t.Id);

        // Properties
        this.Property(t => t.Title)
            .IsRequired()
            .IsFixedLength()
            .HasMaxLength(15);

        this.Property(t => t.Description)
            .IsRequired()
            .HasMaxLength(50);

        // Table & Column Mappings
        this.ToTable("Status");
        this.Property(t => t.Id).HasColumnName("Id");
        this.Property(t => t.Title).HasColumnName("Title");
        this.Property(t => t.Description).HasColumnName("Description");
    }
}

由EF生成的没有FK参考的样本:

public partial class RemarketingCase
{
    public int LoanId { get; set; }
    public int RequestId { get; set; }
    public string VIN { get; set; }
    public int RemarketingCaseId { get; set; }
    public string CaseId { get; set; }
    public string CaseNumber { get; set; }
    public string AssetId { get; set; }
    public System.DateTime Created { get; set; }
    public string CreatedBy { get; set; }
    public Nullable<System.DateTime> Updated { get; set; }
    public string UpdatedBy { get; set; }
}
public class RemarketingCaseMap : EntityTypeConfiguration<RemarketingCase>
{
    public RemarketingCaseMap()
    {
        // Primary Key
        this.HasKey(t => new { t.LoanId, t.RequestId, t.VIN });

        // Properties
        this.Property(t => t.LoanId)
            .HasDatabaseGeneratedOption(DatabaseGeneratedOption.None);

        this.Property(t => t.RequestId)
            .HasDatabaseGeneratedOption(DatabaseGeneratedOption.None);

        this.Property(t => t.VIN)
            .IsRequired()
            .HasMaxLength(25);

        this.Property(t => t.RemarketingCaseId)
            .HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);

        this.Property(t => t.CaseId)
            .HasMaxLength(50);

        this.Property(t => t.CaseNumber)
            .HasMaxLength(50);

        this.Property(t => t.AssetId)
            .HasMaxLength(50);

        this.Property(t => t.CreatedBy)
            .IsRequired()
            .HasMaxLength(50);

        this.Property(t => t.UpdatedBy)
            .HasMaxLength(50);

        // Table & Column Mappings
        this.ToTable("RemarketingCase");
        this.Property(t => t.LoanId).HasColumnName("LoanId");
        this.Property(t => t.RequestId).HasColumnName("RequestId");
        this.Property(t => t.VIN).HasColumnName("VIN");
        this.Property(t => t.RemarketingCaseId).HasColumnName("RemarketingCaseId");
        this.Property(t => t.CaseId).HasColumnName("CaseId");
        this.Property(t => t.CaseNumber).HasColumnName("CaseNumber");
        this.Property(t => t.AssetId).HasColumnName("AssetId");
        this.Property(t => t.Created).HasColumnName("Created");
        this.Property(t => t.CreatedBy).HasColumnName("CreatedBy");
        this.Property(t => t.Updated).HasColumnName("Updated");
        this.Property(t => t.UpdatedBy).HasColumnName("UpdatedBy");
    }
}

手动添加参考样本:

public partial class RemarketingCase
{
    public RemarketingCase()
    {
        this.Addresses = new List<Address>();
        this.Debtors = new List<Debtor>();
        this.Notes = new List<Note>();
        this.RecordHistories = new List<RecordHistory>();
        this.CaseHistories = new List<CaseHistory>();
    }

    public int LoanId { get; set; }
    public int RequestId { get; set; }
    public string VIN { get; set; }
    public int RemarketingCaseId { get; set; }
    public string CaseId { get; set; }
    public string CaseNumber { get; set; }
    public string AssetId { get; set; }
    public System.DateTime Created { get; set; }
    public string CreatedBy { get; set; }
    public Nullable<System.DateTime> Updated { get; set; }
    public string UpdatedBy { get; set; }
    // manually added...
    public virtual ICollection<Address> Addresses { get; set; }
    public virtual ICollection<Debtor> Debtors { get; set; }
    public virtual ICollection<Note> Notes { get; set; }
    public virtual ICollection<RecordHistory> RecordHistories { get; set; }
    public virtual ICollection<CaseHistory> CaseHistories { get; set; }
    public virtual Asset Asset { get; set; }
    public virtual Summary Summary { get; set; }
}

这是我手动添加FK时出现的错误:

  

测试方法AutoPay.Test.Remarketing.DatabaseChange.InsertAsset扔了   exception:System.Data.Entity.Infrastructure.DbUpdateException:An   更新条目时发生错误。查看内部异常   细节。 ---&GT; System.Data.Entity.Core.UpdateException:错误   更新条目时发生。查看内部异常   细节。 ---&GT; System.InvalidOperationException:依赖属性   在ReferentialConstraint中映射到存储生成的列。   专栏:&#39; RemarketingCaseId&#39;。

1 个答案:

答案 0 :(得分:1)

通过稍微更改数据库设计,将可怕的ID字段添加为PK,此错误消失了。虽然这违反了SQL规范化,但它就是这样。不幸的是,我还没有找到让EF正确处理复合PK的方法。 (参见我的问题的评论。)