/// <summary>
/// 将数据实体对象保存至数据库。
/// 如果数据库中被判定存在该记录，则进行 Update 操作，否则进行 Insert 操作。
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="_this"></param>
/// <param name="entity"></param>
public static void AddOrUpdate <TEntity>(this IDbSet <TEntity> _this, TEntity entity) where TEntity : class
{
DbSetMigrationsExtensions.AddOrUpdate <TEntity>(_this, entity);
}
/// <summary>
/// 批量将一组 EF 数据实体对象保存至数据库。
/// 针对集合中的每个数据实体对象，如果数据库中被判定存在该记录，则进行 Update 操作，否则进行 Insert 操作。
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="_this"></param>
/// <param name="entities"></param>
public static void AddOrUpdateRange <TEntity>(this IDbSet <TEntity> _this, IEnumerable <TEntity> entities) where TEntity : class
{
DbSetMigrationsExtensions.AddOrUpdate <TEntity>(_this, entities.ToArray());
}
protected override void Seed(NorthwindContext context)
{
if (!context.Database.Exists())
{
return;
}
////Task 1 Seeding
////Task 3 Seeding
if (!context.Categories.Any())
{
Category[] categories =
{
new Category()
{
CategoryName = "Electronic", Description = "Description conserning electric devices"
},
new Category()
{
CategoryName = "Food", Description = "Food description"
},
new Category()
{
CategoryName = "Shoes", Description = "Shoes description"
},
};
DbSetMigrationsExtensions.AddOrUpdate(context.Categories, categories);
context.SaveChanges();
}
////
if (!context.Products.Any())
{
Product[] products =
{
new Product()
{
ProductName = "Nike Revolution U4",
UnitPrice = 90, UnitsOnOrder = 15, UnitsInStock = 100, ReorderLevel = 3,
Discontinued = false, CategoryID = 3
},
new Product()
{
ProductName = "FILA",
UnitPrice = 160, UnitsOnOrder = 23, UnitsInStock = 124, ReorderLevel = 4,
Discontinued = false, CategoryID = 3
},
new Product()
{
ProductName = "Asus Vivo Book",
UnitPrice = 660, UnitsOnOrder = 13, UnitsInStock = 65, ReorderLevel = 2,
Discontinued = false, CategoryID = 1
}
};
DbSetMigrationsExtensions.AddOrUpdate(context.Products, products);
context.SaveChanges();
}
if (!context.Customers.Any())
{
Customer[] customers =
{
new Customer()
{
CustomerID = "25", ContactName = "Jone Mill", CompanyName = "ABC", EstablishDate = DateTime.Now
},
new Customer()
{
CustomerID = "38", ContactName = "Polly Sebas", CompanyName = "XYZ", EstablishDate = DateTime.Now
}
};
DbSetMigrationsExtensions.AddOrUpdate(context.Customers, customers);
context.SaveChanges();
}
if (!context.Employees.Any())
{
Employee[] employees =
{
new Employee()
{
FirstName = "Mark",
LastName = "Levi"
},
new Employee()
{
FirstName = "Fillip",
LastName = "Blank"
},
new Employee()
{
FirstName = "Polly",
LastName = "Adams"
}
};
DbSetMigrationsExtensions.AddOrUpdate(context.Employees, employees);
context.SaveChanges();
}
if (!context.Orders.Any())
{
Order[] orders =
{
new Order()
{
CustomerID = "25",
EmployeeID = 1
},
new Order()
{
CustomerID = "25",
EmployeeID = 1
},
new Order()
{
CustomerID = "38",
EmployeeID = 2
}
};
DbSetMigrationsExtensions.AddOrUpdate(context.Orders, orders);
context.SaveChanges();
}
if (!context.OrderDetails.Any())
{
OrderDetail[] orderDetails =
{
new OrderDetail()
{
OrderID = 1, ProductID = 2, UnitPrice = 100, Quantity = 23, Discount = 12
},
new OrderDetail()
{
OrderID = 2, ProductID = 1, UnitPrice = 33, Quantity = 2, Discount = 1
},
new OrderDetail()
{
OrderID = 3, ProductID = 3, UnitPrice = 1, Quantity = 33, Discount = 5
}
};
DbSetMigrationsExtensions.AddOrUpdate(context.OrderDetails, orderDetails);
context.SaveChanges();
}
////
////Task 3 Seeding
if (!context.Regions.Any())
{
Region[] regions =
{
new Region()
{
RegionDescription = "West"
},
new Region()
{
RegionDescription = "South"
}
};
DbSetMigrationsExtensions.AddOrUpdate(context.Regions, regions);
context.SaveChanges();
}
if (!context.Territories.Any())
{
Territory[] territories =
{
new Territory()
{
TerritoryID = "1", TerritoryDescription = "TER 1", RegionID = 1
},
new Territory()
{
TerritoryID = "2", TerritoryDescription = "TER 2", RegionID = 2
}
};
DbSetMigrationsExtensions.AddOrUpdate(context.Territories, territories);
context.SaveChanges();
}
////
base.Seed(context);
}