Question

如何在C＃类中创建外键？

我有两个单独的课程，Customer和Sales。

class Customer
{
    [PrimaryKey,AutoIncrement]
    public int ID { get; set; }

    public string name { get; set; }
    public string address { get; set; }

    [MaxLength(11)]
    public int phone { get; set; }

    public double Account_payable { get; set; }
}

class Sales
{
    [PrimaryKey,AutoIncrement]
    public int OrderID { get; set;}

   // here I want to add a foreign key to the Customer table
}

Answer 1

请使用https://bitbucket.org/twincoders/sqlite-net-extensions

这里有一对多的例子：

public class Stock
{
    [PrimaryKey, AutoIncrement]
    public int Id { get; set; }
    [MaxLength(8)]
    public string Symbol { get; set; }

    [OneToMany(CascadeOperations = CascadeOperation.All)] 
    public List<Valuation> Valuations { get; set; }
}

public class Valuation
{
    [PrimaryKey, AutoIncrement]
    public int Id { get; set; }

    [ForeignKey(typeof(Stock))]     // Specify the foreign key
    public int StockId { get; set; }
    public DateTime Time { get; set; }
    public decimal Price { get; set; }

    [ManyToOne]      // Many to one relationship with Stock
    public Stock Stock { get; set; }
}

Answer 2

Sqlite.net没有外键支持，但您可以使用Sqlite.net-extensions

https://www.nuget.org/packages/SQLiteNetExtensions/

如何在SQLite的C＃类中创建外键

2 个答案: