/// <summary>
/// 透過ToList, foreach才會觸發連結DB
/// </summary>
public static void AboutDbContext()
{
using (var context = new EFTestContext())
{
context.Database.Log = Console.WriteLine;
var products = from product in context.Products
select product;
var list = products.ToList();
}
}
public static void UpdateEntity()
{
using (var context = new EFTestContext())
{
var product = context.Products.FirstOrDefault();
Console.WriteLine($"Origin Data: {product.Name},{product.Money}");
product.Money = 299;
context.SaveChanges();
Console.WriteLine($"After Update: {product.Name},{product.Money}");
}
}
public static void ReloadEntity()
{
using (var context = new EFTestContext())
{
var product = context.Products.FirstOrDefault();
Console.WriteLine($"Origin Data: {product.Name},{product.Money}");
Console.WriteLine("Press Any Key After Update Database ");
Console.ReadLine();
context.Entry(product).Reload();
Console.WriteLine($"After Reload: {product.Name},{product.Money}");
}
}
public static void SqlQueryByDbSet()
{
using (var context = new EFTestContext())
{
context.Database.Log = Console.WriteLine;
var products = context.Products.SqlQuery(@"SELECT PId, ProductName AS Name, Price AS Money, Category, CreateTime
FROM Products WHERE PId = @id", new SqlParameter("id", 1)).ToList();
foreach (var product in products)
{
Console.WriteLine($"{product.Name},{product.Money}");
}
}
}
public static void ObjectContext()
{
using (var context = new EFTestContext())
{
var objectContextAdapter = (IObjectContextAdapter)context;
var objectContext = objectContextAdapter.ObjectContext;
var products = objectContext.CreateObjectSet <TProduct>();
foreach (var product in products)
{
Console.WriteLine($"{product.Name},{product.Money}");
}
}
}
private static void OneToOne()
{
using (EFTestContext context = new EFTestContext())
{
context.Database.Log = Console.WriteLine;
var product = context.Products.Include(p => p.Book).First();
product.Book = new TBook {
Page = 300
};
context.Entry(product).State = EntityState.Modified;
context.SaveChanges();
}
}
public static void EFDeleteAction()
{
using (var context = new EFTestContext())
{
// EF Remove, RemoveRange是一筆一筆刪除
context.Database.Log = Console.WriteLine;
var product = context.Products.FirstOrDefault();
context.Products.Remove(product);
var products = context.Products.Where(p => p.PId > 1);
context.Products.RemoveRange(products);
context.SaveChanges();
}
}
private static void OneToManyCutomFK()
{
using (EFTestContext context = new EFTestContext())
{
context.Database.Log = Console.WriteLine;
var userRole = context.UserRoles.First();
context.Users.Add(new TUser
{
Name = "Wendy",
Account = "Wendy",
Password = "******",
UserRole = userRole
});
context.SaveChanges();
}
}
public static void EFLocal()
{
using (var context = new EFTestContext())
{
context.Database.Log = Console.WriteLine;
var local = context.Products.Local;
Console.WriteLine($"Local: {local.Count}");
foreach (var product in context.Products)
{
}
Console.WriteLine($"Query-Local: {local.Count}");
context.Products.Add(new TProduct {
Name = "大話重購", Money = 399, Category = "重購"
});
Console.WriteLine($"Add-Local: {local.Count}");
Console.WriteLine($"Really-Local: {context.Products.Count()}");
}
}
public static void EFInsertAction()
{
using (var context = new EFTestContext())
{
context.Database.Log = Console.WriteLine;
context.Products.Add(new TProduct {
Name = "MVC 開發實戰", Money = 399, Category = "網頁開發"
});
context.Products.AddRange(new List <TProduct>
{
new TProduct {
Name = "Docker 入門實戰", Money = 399, Category = "容器"
},
new TProduct {
Name = "大話設計", Money = 399, Category = "設計模式"
}
});
context.SaveChanges();
}
}
private static void OneToMany()
{
using (EFTestContext context = new EFTestContext())
{
context.Database.Log = Console.WriteLine;
var order = new TOrder
{
OrderDate = DateTime.Now,
OrderDetails = new List <TOrderDetail>
{
new TOrderDetail {
Price = 699, ProductName = "Design Pattern", Quantity = 1
},
new TOrderDetail {
Price = 499, ProductName = "MVC In Action", Quantity = 1
}
}
};
context.Orders.Add(order);
context.SaveChanges();
}
}
