public void Add(InternetShopFilter filter)
{
FilesProvider.OpenWriter("InternetShop");
InternetShop newCollection = new InternetShop();
if (filter.Id.HasValue)
{
newCollection.Id = (int)filter.Id;
}
if (!string.IsNullOrEmpty(filter.Name))
{
newCollection.Name = filter.Name;
}
if (!string.IsNullOrEmpty(filter.Category))
{
newCollection.Category = filter.Category;
}
if (!string.IsNullOrEmpty(filter.Price))
{
newCollection.Price = filter.Price;
}
FilesProvider.WriteMusicCollection(newCollection);
FilesProvider.CloseWriter();
}
static void ProxyInvoke()
{
// 创建一个代理对象并发出请求
InternetShop proxy = new InternetShop();
proxy.Sell();
}
public static void WriteMusicCollection(InternetShop collection)
{
Writer.WriteLine("Id: {0}", collection.Id);
Writer.WriteLine("Name: {0}", collection.Name);
Writer.WriteLine("Category: {0}", collection.Category);
Writer.WriteLine("Price: {0}", collection.Price);
Writer.WriteLine();
}
public List <InternetShop> Get(InternetShopFilter filter)
{
List <InternetShop> ResultInternetShop = new List <InternetShop>();
DatabaseProvider.CreateConnectionAndCommand();
//
string cmd = "SELECT * FROM Names";
List <string> conditions = new List <string>();
//
if (filter.Id.HasValue)
{
conditions.Add("Id = " + filter.Id.ToString());
}
if (!string.IsNullOrEmpty(filter.Name))
{
conditions.Add(string.Format("Name = '{0}'", filter.Name));
}
if (!string.IsNullOrEmpty(filter.Category))
{
conditions.Add(string.Format("Category = '{0}'", filter.Category));
}
if (!string.IsNullOrEmpty(filter.Price))
{
conditions.Add(string.Format("Price = '{0}'", filter.Price));
}
if (conditions.Count() > 0)
{
cmd += " WHERE " + string.Join(" AND ", conditions.ToArray());
}
DatabaseProvider.ExecuteCommand(cmd);
//
DatabaseProvider.BeginReader();
while (DatabaseProvider.Reader.Read())
{
int id = (int)DatabaseProvider.Reader["id"];
string name = (string)DatabaseProvider.Reader["name"];
string category = (string)DatabaseProvider.Reader["category"];
string price = (string)DatabaseProvider.Reader["Price"];
InternetShop collection = new InternetShop(id, name, category, price);
ResultInternetShop.Add(collection);
}
DatabaseProvider.FinishReader();
//
DatabaseProvider.CloseConnection();
return(ResultInternetShop);
}
public List <InternetShop> Get(InternetShopFilter filter)
{
List <InternetShop> ResultInternetShop = new List <InternetShop>();
FilesProvider.OpenReader("InternetShop");
int peek = FilesProvider.Peek();
while (peek != -1)
{
string IdRow = FilesProvider.ReadRow();
if (string.IsNullOrEmpty(IdRow))
{
break; // means that if file is empty
}
string[] IdParts = IdRow.Split(':');
int id = Convert.ToInt32(IdParts[1].Trim());
string NameRow = FilesProvider.ReadRow();
string[] NameParts = NameRow.Split(':');
string name = NameParts[1].Trim();
string CategoryRow = FilesProvider.ReadRow();
string[] CategoryParts = NameRow.Split(':');
string category = CategoryParts[1].Trim();
string PriceRow = FilesProvider.ReadRow();
string[] PriceParts = PriceRow.Split(':');
string price = PriceParts[1].Trim();
InternetShop Collection = new InternetShop(id, name, category, price);
ResultInternetShop.Add(Collection);
peek = FilesProvider.Peek();
if (FilesProvider.ReadRow() == "")
{
continue;
}
} // while
FilesProvider.CloseReader();
return(ResultInternetShop);
}