Question

我正在将Code First用于现有数据库，并且有一个我必须映射到两个表的实体，我该如何实现？

数据库：

CREATE TABLE Supplier(
    SupplierId bigint identity(1,1) NOT NULL,
    SupplierName varchar(60) NOT NULL
)

CREATE TABLE Customer(
    CustomerId bigint identity(1,1) NOT NULL,
    CustomerName varchar(60) NOT NULL
)

CREATE TABLE SupplierPayments(
    SupplierPaymentNumber bigint NOT NULL,
    SupplierId bigint NOT NULL, 
    PaymentValue decimal(19,4)  NOT NULL
)

CREATE TABLE CustomerPayments(
    CustomerPaymentNumber bigint NOT NULL,
    CustomerId bigint NOT NULL, 
    PaymentValue decimal(19,4)  NOT NULL
)

ALTER TABLE SupplierPayments
ADD CONSTRAINT PK_SupplierPayments
    PRIMARY KEY CLUSTERED (SupplierPaymentNumber, SupplierId ASC);

    ALTER TABLE CustomerPayments
ADD CONSTRAINT PK_CustomerPaymentss
    PRIMARY KEY CLUSTERED (CustomerPaymentNumber, CustomerId ASC);

我的实体：

public partial class Supplier{
     public long SupplierId{ get; set; }
     public string Name{ get; set; }
     public virtual List<Payment> Payments{ get; set; }
}

public partial class Customer{
     public long CustomerId{ get; set; }
     public string Name{ get; set; }
     public virtual List<Payment> Payments{ get; set; }
}

public partial class Payment{
     public long PaymentNumber{ get; set; }
     public decimal Value{ get; set; }
}

如何配置（使用Fluent API）供应商和客户之间的多对一关系付款？

Answer 1

你可能在维护这样的代码时遇到麻烦。完全删除Customer和Supplier类并添加另一个名为的实体可能更明智，比如说BusinessPartner：

public partial class BusinessPartner {
    public long Id {get; set; }
    public string Name {get; set; }
    public BusinessPartnerType Type {get; set; }
}

public enum BusinessPartnerType {
    Customer = 1,
    Supplier = 2
}

从SupplierPayments和CustomerPayments开始 - 这些也应替换为一个表，但您不必指定付款类型，因为它已在BusinessPartner表中指定。

如何将实体映射到多个表？

1 个答案: