internal static int GetTotalNumProducts()
{
var context = new CommereceDBContext();
//gets the amount of products in the DB. it uses count because its a query.
return(context.Products.Count());
}
public static void AddMemeber(Member m)
{
var context = new CommereceDBContext();
context.Members.Add(m);
context.SaveChanges();
}
public static Product GetProductById(int id)
{
CommereceDBContext context = new CommereceDBContext();
//finds a single product by its id number
Product p = context.Products.Find(id);
return(p);
}
public static bool IsUsernameTaken(RegistrationViewModel reg)
{
//check if username is unique
var db = new CommereceDBContext();
bool isNameTaken = (from mem in db.Members
where mem.UserName == reg.UserName
select mem).Count() == 1;
return(isNameTaken);
}
public static void Update(Product p)
{
var context = new CommereceDBContext();
//Tell EF this product has only been modified
//It's already in the database
context.Entry(p).State = EntityState.Modified;
//Send Update query to the DB
context.SaveChanges();
}
public static bool UserExists(LoginViewModel login)
{
var db = new CommereceDBContext();
bool doesExists = (from mem in db.Members
where mem.UserName == login.Username && mem.Password == login.Password
select mem).Any(); // the query ran will determine if the loginViewModel form filled with a pass and username
// is in the database if it is the any() at the end will return true so does exists will be true;
return(doesExists);
}
//missisng something
public static void DeleteProduct(int id)
{
var context = new CommereceDBContext();
//makes Ef recognize that p came from the DB.
Product p = context.Products.Find(id);
//marks p for deletion
context.Products.Remove(p);
//sends the above query to the DB
context.SaveChanges();
}
public static List <Product> GetProductByPage(int page, byte pageSize)
{
//database instance
CommereceDBContext context = new CommereceDBContext();
List <Product> prodList = context
.Products
.Take(pageSize) // get all products from context but take a PageSize amount only
.OrderBy(p => p.Name)
.Skip((page - 1) * pageSize) // skips the amount of PageSize allowed by what page you are on.
.ToList(); // gets all products and turns it into a list.
return(prodList);
}
// step 1. create a instance of the db
// step 2. Add a pending object
// step 3. execute the add using saveChanges();
/// <summary>
/// adds a product to the database using entity syntax. //////////////////// REFERENCE
/// </summary>
/// <param name="p"></param>
public static void AddProduct(Product p)
{
//1.
//Create instance of DBContext class.
//context is referencingthe DB
CommereceDBContext context = new CommereceDBContext();
//2.
//Prepare insert statement
//tells entity you want to add a product (p) to the database dosnt add it.
context.Products.Add(p);
// 3.
//Execute pending insert //the pending insert is what was done above with context.Products.Add(p)
context.SaveChanges();
}
// if your class is static your methods should be static too.
/// <summary>
/// should return a list of all products from the products table.
/// </summary>
/// <returns>list of type products</returns>
public static List <Product> GetAllProducts()
{
//linq query syntax to query the db. (Language Integrated Query)
CommereceDBContext context = new CommereceDBContext();
//Method 1: LINQ Query Syntax
// basically saying for every p (product in products table)
//what we are trying to do
//SELECT * FROM Products ORDER BY Name
List <Product> products = (from p in context.Products
orderby p.Name
select p).ToList();
//METHOD 2: LINQ Method Syntax
List <Product> products2 = context.Products.OrderBy(p => p.Name).ToList();
return(products);
}
