EF外键关联

Posted 2020-08-04 黄立柳

客户里面存在客服外键

基类模型

public class ModelBase
    {
        public ModelBase()
        {
            CreateTime = DateTime.Now;
        }
        [Key]
        public virtual int ID { get; set; }
        public virtual DateTime CreateTime { get; set; }
    }

客服模型

[Table("CustomerServer")]
    public partial class CustomerServer : ModelBase
    {
        public string ServerId { get; set; }

        public string ServerName { get; set; }
        
        public string Email { get; set; }
        public string Mobile { get; set; }

        public virtual List<Customer> CustomerManagerFor { get; set; }

}

客户模型

[Table("Customer")]
    public class Customer : ModelBase
    {
        [Required(ErrorMessage = "分支编号不能为空！"), MaxLength(4, ErrorMessage = "分支编号不能超过4个字符！")]
        public string BranchId { get; set; }

        [Required(ErrorMessage = "客户编号不能为空！"), MaxLength(10, ErrorMessage = "客户编号不能超过10个字符！")]
        public string CustomerId { get; set; }

        [Required(ErrorMessage = "客户姓名不能为空！"), MaxLength(50, ErrorMessage = "客户姓名不能超过50个字符！")]
        public string Name { get; set; }

        [Required(ErrorMessage = "性别不能为空！")]
        public int Sex { get; set; }

        [Required(ErrorMessage = "生日不能为空！")]
        public DateTime Birthday { get; set; }


        [Required(ErrorMessage = "资金账号不能为空！"), MaxLength(40, ErrorMessage = "资金账号不能超过40个字符！")]
        public string FundAccount { set; get; }

        [Required(ErrorMessage = "资产不能为空！")]
        public decimal Assets { get; set; }

        [Required(ErrorMessage = "联系方式不能为空！"), MaxLength(40, ErrorMessage = "联系方式不能超过40个字符！")]
        public string Contact { get; set; }

        [Required(ErrorMessage = "地级市不能为空！")]
        public int City { get; set; }

        [InverseProperty("CustomerManagerFor")]
        [Required(ErrorMessage = "客户经理不能为空！")]
        public virtual CustomerServer CustomerManager { get; set; }
        
        [Required(ErrorMessage = "开户日期不能为空！")]
        public DateTime OpeningDate { get; set; }

        [Required(ErrorMessage = "风险类型不能为空！")]
        public int RiskType { get; set; }

        [Required(ErrorMessage = "客户类型不能为空！")]
        public int CustomerType { get; set; }
    }

    [AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
    public class UniqueAttribute : ValidationAttribute
    {
        public override Boolean IsValid(Object value)
        {
            //校验数据库是否存在当前Key

            return true;
        }
    }

在上下文进行映射

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            Database.SetInitializer<CrmDbContext>(null);
            base.OnModelCreating(modelBuilder);
            modelBuilder.Entity<Customer>().HasRequired(v => v.CustomerManager).WithMany(d => d.CustomerManagerFor).Map(v => v.MapKey("CustomerManager")).WillCascadeOnDelete(false);
        }
　　　　public DbSet<Customer> Customers { get; set; }
　　　　public DbSet<CustomerServer> CustomerServers { get; set; }

查询

IQueryable<Customer> queryList = dbContext.Customers.Include("CustomerManager");

刚学EF，不懂要Include,查到的记录CustomerManager都是null,Include之后才有数据，在此标志一下