Question

当我使用EF6进行插入时，出现此错误

在SET子句中多次指定了列名“ employee_id”。一列不能在同一SET子句中分配多个值。修改SET子句以确保列仅更新一次。如果SET子句更新视图的列，则列名'employee_id'可能在视图定义中出现两次

我的模型如下：

public class Entity
{
        public Entity()
        {
            IsActive = true;
            IsDeleted = false;
            DateCreated = DateTime.Now;
        }

        [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public long ID { get; set; }
        public int CompanyID { get; set; }
        public int SubID { get; set; }
        public DateTime DateCreated { get; set; }

        public bool IsTransient()
        {
            return EqualityComparer<long>.Default.Equals(ID, default(long));
        }

        public bool IsDeleted { get; set; }
        public bool IsActive { get; set; }
}

public partial class NextOfKin : Entity
{
        [Required]
        public long employee_id { get; set; }

        [StringLength(100)]
        [Required]
        public string nok_first_name { get; set; }

        [StringLength(100)]
        [Required]
        public string nok_last_name { get; set; }

        [StringLength(300)]
        [Required]
        public string nok_address { get; set; }

        [StringLength(100)]
        public string nok_email { get; set; }

        [StringLength(100)]
        public string nok_phone { get; set; }

        [StringLength(100)]
        public string nok_employer { get; set; }

        [StringLength(300)]
        public string nok_work_address { get; set; }

        [StringLength(100)]
        [Required]
        public string nok_relationship { get; set; }

        public virtual Employee Employee { get; set; }
}

public class Employee : Entity
{
        //Person Records
        public long UserId { get; set; }
        public int TitleId { get; set; }
        public int? ReligionId { get; set; }
        public string SerialNo { get; set; }
        [StringLength(100)]
        [Required]
        public string FirstName { get; set; }
        [StringLength(100)]
        [Required]
        public string LastName { get; set; }
}

我插入亲戚的代码是这样的。

NextOfKin nextOfKin = new NextOfKin();

nextOfKin.employee_id = newEmployee.ID;
nextOfKin.nok_first_name = "Friday";
nextOfKin.nok_last_name = "Ben";
nextOfKin.nok_address = "XXX";
nextOfKin.nok_email = "xa@xo.com";
nextOfKin.nok_phone = "023938494";
nextOfKin.nok_employer = "50 Queens Street";
nextOfKin.nok_work_address = "51 Queens Street";
nextOfKin.nok_relationship = "Neighbour";

db.NextOfKins.Add(nextOfKin);
db.SaveChanges();

Answer 1

要解决此问题，请删除近亲模型上的关系，然后进行迁移。要删除，请从NextOfKin模型中删除public virtual Employee Employee { get; set; }。

此问题的原因如下：

仅当您正确命名引用属性时，关系才能正确创建。在这种情况下，应使用EmployeeID而不是employee_id来表示近亲和雇员之间的关系。
Employee模型没有指向亲戚模型的链接。如果是一对多，则可以将以下属性添加到Employee模型。

公共虚拟列表NextOfKins {get; set;} //如果您需要延迟加载

或

公开列表NextOfKins {get; set;} //如果您不需要延迟加载

SQL Server在set子句中多次指定了列名。实体框架问题

1 个答案: