public bool DeleteCategory(int id)
{
using var db = new NorthwindContex();
if (id > 0)
{
var category = db.Categories.Find(id);
if (category != null)
{
db.Categories.Remove(category);
int changes = db.SaveChanges();
if (changes > 0)
{
return(true);
}
else
{
return(false);
}
}
else
{
return(false);
}
}
else
{
return(false);
}
}
public bool UpdateCategory(int id, string name, string description)
{
using var db = new NorthwindContex();
if (id > 0)
{
var category = db.Categories.Find(id);
if (category != null)
{
category.Id = id;
category.Name = name;
category.Description = description;
int changes = db.SaveChanges();
if (changes > 0)
{
return(true);
}
else
{
return(false);
}
}
else
{
return(false);
}
}
else
{
return(false);
}
}
public Order GetOrder(int id)
{
using var db = new NorthwindContex();
var order = db.Orders.Find(id);
order.OrderDetails = GetOrderDetailsByOrderId(id);
return(order);
}
public List <OrderDetails> GetOrderDetailsByProductId(int id)
{
using var db = new NorthwindContex();
var orderDetailsList = db.OrderDetails.Where(x => x.ProductId == id);
foreach (var orderDetail in orderDetailsList)
{
orderDetail.Order = GetOrder(orderDetail.OrderId);
}
return(orderDetailsList.ToList());
}
public Product GetProduct(int id)
{
using var db = new NorthwindContex();
var product = db.Products.Find(id);
if (product != null)
{
product.Category = GetCategory(product.CategoryId);
return(product);
}
return(null);
}
// ORDER
public List <Order> GetOrders()
{
var listorderdetail = GetOrderDetails();
using var db = new NorthwindContex();
var query =
from o in db.Orders
select new Order()
{
Id = o.Id, Date = o.Date, Freight = o.Freight, Required = o.Required, Shipped = o.Shipped == null ? DateTime.Now : o.Shipped, ShipCity = o.ShipCity, ShipName = o.ShipName, OrderDetails = listorderdetail
};
return(query.ToList());
}
//2
public List <Order> GetOrdersByShippingName(string shipnamequery)
{
using var db = new NorthwindContex();
return(new List <Order>
{
db.Orders
.Where(x => x.ShipName == shipnamequery)
.Select(y => new Order()
{
Id = y.Id, Date = y.Date, ShipName = y.ShipName, ShipCity = y.ShipCity
})
.FirstOrDefault()
});
}
//3
public Order GetOrder(int idquery)
{
var orderdetails = GetOrderDetailsByOrderId(idquery);
using var db = new NorthwindContex();
var query =
from o in db.Orders
join od in db.OrderDetails on o.Id equals od.OrderId
where o.Id == idquery
select new Order()
{
Id = o.Id, Date = o.Date, Required = o.Required, Shipped = o.Shipped == null ? DateTime.Now : o.Shipped, Freight = o.Freight, ShipName = o.ShipName, ShipCity = o.ShipCity, OrderDetails = orderdetails
};
return(query.FirstOrDefault());
}
//6
public Product GetProduct(int idproductquery)
{
using var db = new NorthwindContex();
return(db.Products
.Join(db.Categories,
product => product.CategoryId,
category => category.Id,
(product, category) => new Product()
{
Id = product.Id, Name = product.Name, QuantityPerUnit = product.QuantityPerUnit, UnitPrice = product.UnitPrice, UnitsInStock = product.UnitsInStock, Category = new Category()
{
Id = category.Id, Name = category.Name, Description = category.Description
}
})
.FirstOrDefault(x => x.Id == idproductquery));
}
//8
public List <Product> GetProductByCategory(int idcategoryquery)
{
using var db = new NorthwindContex();
var query =
from p in db.Products
join c in db.Categories on p.CategoryId equals c.Id
where p.CategoryId == idcategoryquery
select new Product()
{
Id = p.Id, Name = p.Name, UnitPrice = p.UnitPrice, Category = new Category()
{
Id = c.Id, Name = c.Name, Description = c.Description
}
};
return(query.ToList());
}
//5
public List <OrderDetails> GetOrderDetailsByProductId(int idproductquery)
{
using var db = new NorthwindContex();
var query =
from od in db.OrderDetails
join o in db.Orders on od.OrderId equals o.Id
where od.ProductId == idproductquery
select new OrderDetails()
{
OrderId = od.OrderId, Quantity = od.Quantity, UnitPrice = od.UnitPrice, Order = new Order()
{
Id = o.Id, Date = o.Date, ShipName = o.ShipName, ShipCity = o.ShipCity
}
};
return(query.ToList());
}
//13
public Boolean DeleteCategory(int idquery)
{
using var db = new NorthwindContex();
var category = db.Categories.Find(idquery);
if (category != null)
{
db.Categories.Remove(category);
db.SaveChanges();
return(true);
}
else
{
return(false);
}
}
//11
public Category CreateCategory(string namequery, string descriptionquery)
{
using var db = new NorthwindContex();
var nextId = db.Categories.Max(x => x.Id) + 1;
var cat = new Category
{
Id = nextId,
Name = namequery,
Description = descriptionquery
};
db.Categories.Add(cat);
db.SaveChanges();
return(db.Categories.Find(nextId));
}
public List <Product> GetProductByCategory(int id)
{
using var db = new NorthwindContex();
var pList = db.Products.Where(x => x.CategoryId == id);
var products = pList.ToList();
if (pList.Any())
{
foreach (var product in products)
{
product.Category = GetCategory(product.CategoryId);
}
return(products);
}
else
{
return(products);
}
}
public List <Product> GetProductByName(string name)
{
using var db = new NorthwindContex();
var pList = db.Products.Where(x => x.Name.Contains(name));
var products = pList.ToList();
if (pList.Any())
{
foreach (var product in products)
{
product.Category = GetCategory(product.CategoryId);
}
return(products);
}
else
{
return(products);
}
}
// ORDERDETAIL
public List <OrderDetails> GetOrderDetails()
{
using var db = new NorthwindContex();
var query =
from od in db.OrderDetails
join p in db.Products on od.ProductId equals p.Id
join c in db.Categories on p.CategoryId equals c.Id
select new OrderDetails()
{
OrderId = od.OrderId, Quantity = od.Quantity, UnitPrice = od.UnitPrice, Product = new Product()
{
Id = p.Id, Name = p.Name, UnitPrice = p.UnitPrice, QuantityPerUnit = p.QuantityPerUnit, UnitsInStock = p.UnitsInStock, CategoryId = p.CategoryId, Category = new Category()
{
Id = c.Id, Name = c.Name, Description = c.Description
}
}
};
return(query.ToList());
}
//12
public Boolean UpdateCategory(int idquery, string namequery, string descriptionquery)
{
using var db = new NorthwindContex();
var category = db.Categories.Find(idquery);
if (category != null)
{
category.Name = namequery;
category.Description = descriptionquery;
db.SaveChanges();
return(true);
}
else
{
return(false);
}
}
public Category CreateCategory(string name, string description)
{
using var db = new NorthwindContex();
var nextId = db.Categories.Max(x => x.Id) + 1;
var category = new Category
{
Id = nextId,
Name = name,
Description = description
};
db.Categories.Add(category);
int changes = db.SaveChanges();
if (changes > 0)
{
return(category);
}
else
{
return(null);
}
}
//10
public List <Category> GetCategories()
{
using var db = new NorthwindContex();
return(db.Categories.ToList());
}
// CATEGORY
//9
public Category GetCategory(int idquery)
{
using var db = new NorthwindContex();
return(db.Categories.Find(idquery));
}
// PRODUCT
public List <Product> GetProducts()
{
using var db = new NorthwindContex();
return(db.Products.ToList());
}
public List <Order> GetOrders()
{
using var db = new NorthwindContex();
return(db.Orders.ToList());
}
