1

我有一个名为 DeliveryRequest 的表和另一个名为 Operator 的表，表 DeliveryRequest 如下：

public class DeliveryRequest
{
    public int ID { get; set; }
    public DateTime Date { get; set; }
    public string UserID { get; set; }
    public string Waybill { get; set; }
    public string Reference { get; set; }
    public int SupplierID { get; set; }
    public Supplier Supplier { get; set; }
    //[ForeignKey("Operator")]
    public int SenderID { get; set; }
    public Operator Sender { get; set; }
    //[ForeignKey("Operator")]
    public int ReceiverID { get; set; }
    public Operator Receiver { get; set; }
    public string Origin { get; set; }
    public string Destination { get; set; }
    public int ServiceID { get; set; }
    public Service Service { get; set; }
}

而表操作符如下：

public class Operator
{
    public int ID { get; set; }
    public string Company { get; set; }
    public int ContactID { get; set; }
    public Contact Contact { get; set; }
    public int AddressID { get; set; }
    public Address Address { get; set; }
}

所以问题是，当我尝试更新我的数据库时，我得到一个 FK 约束错误，如下所示：

在表“DeliveryRequests”上引入 FOREIGN KEY 约束“FK_dbo.DeliveryRequests_dbo.Operators_SenderID”可能会导致循环或多个级联路径。指定 ON DELETE NO ACTION 或 ON UPDATE NO ACTION，或修改其他 FOREIGN KEY 约束。无法创建约束或索引。请参阅以前的错误。

和前面的错误是一样的。如下：

System.Data.SqlClient.SqlException (0x80131904)：在表“DeliveryRequests”上引入 FOREIGN KEY 约束“FK_dbo.DeliveryRequests_dbo.Operators_SenderID”可能会导致循环或多个级联路径。指定 ON DELETE NO ACTION 或 ON UPDATE NO ACTION，或修改其他 FOREIGN KEY 约束。

专注于发送者和接收者部分，我不是专家，但错误一定存在哈哈

//[ForeignKey("Operator")]
public int SenderID { get; set; }
public Operator Sender { get; set; }
//[ForeignKey("Operator")]
public int ReceiverID { get; set; }
public Operator Receiver { get; set; }
4

1 回答 1

1

看起来您正在使用Code First方法。所以尝试关闭 CascadeDelete DeliveryRequests：

modelBuilder.Entity<DeliveryRequests>()
    .HasRequired(c => c.Operator )
    .WithMany()
    .WillCascadeOnDelete(false);

例如：

public class YourDBContext: DbContext 
{
    public YourDBContext(): base() 
    {
    }


    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<DeliveryRequests>()
            .HasRequired(c => c.Operator )
            .WithMany()
            .WillCascadeOnDelete(false);    
    }
}
于 2019-03-13T06:59:34.070 回答