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我现在在这里做的是可能是满足我的要求的最糟糕的方式，但我还没有找到任何其他方式。用c检索父/子查询结果SQL Server＃
这里是我的示例数据库结构;
下面是我为了获取一定的值，用脚本;
SELECT DISTINCT h.HotelID, h.HotelName, r.RoomCode, r.RoomName, r.RoomID
FROM RoomsInHotel rh
INNER JOIN Hotels h ON rh.HotelID = h.HotelID
INNER JOIN Rooms r ON rh.RoomID = r.RoomID
order by h.HotelName, r.RoomCode;
这是上面的脚本给我的结果;
一切都很好，直到在这里。
我需要从这里转到C＃代码。我想达到的是以下结果;
这里是我担心的。我使用Linq来实现这个功能，下面的代码是我用于上述控制台结果的代码。
public class Hotel {
public int HotelID {get; set; }
public string HotelName {get; set; }
public IQueryable<Room> Rooms {get; set; }
}
public class HotelWithOneRoom {
public int HotelID { get; set; }
public string HotelName { get; set; }
public Room Room { get; set; }
}
public class Room {
public int RoomID {get; set; }
public string RoomCode {get; set; }
public string RoomName { get; set; }
}
class Program {
static void Main(string[] args) {
#region _assets
IList<HotelWithOneRoom> tempHotelWithOneRoom = new List<HotelWithOneRoom>();
IList<Hotel> tempDistinctHotels = new List<Hotel>();
IList<Room> tempRooms = new List<Room>();
#endregion
#region _connectionString
var connectionString = "Data Source=TOSHIBA-PC\\SQLEXPRESS;Initial Catalog=tbAccomm;Integrated Security=True";
#endregion
using (SqlConnection conn = new SqlConnection(connectionString)) {
using(SqlCommand cmd = conn.CreateCommand()) {
#region _connect to db, generate script and retrieve values
cmd.CommandText = "SELECT DISTINCT h.HotelID, h.HotelName, r.RoomCode, r.RoomName, r.RoomID FROM RoomsInHotel rh INNER JOIN Hotels h ON rh.HotelID = h.HotelID INNER JOIN Rooms r ON rh.RoomID = r.RoomID order by h.HotelName, r.RoomCode;";
cmd.CommandType = System.Data.CommandType.Text;
conn.Open();
SqlDataReader r = cmd.ExecuteReader();
#endregion
#region _assigning the values to tempHotelWithOneRoom
while (r.Read()) {
tempHotelWithOneRoom.Add(new HotelWithOneRoom {
HotelID = int.Parse(r["HotelID"].ToString()),
HotelName = r["HotelName"].ToString(),
Room = new Room {
RoomID = int.Parse(r["RoomID"].ToString()),
RoomCode = r["RoomCode"].ToString(),
RoomName = r["RoomName"].ToString()
}
});
}
#endregion
foreach (var item in tempHotelWithOneRoom) {
if (tempDistinctHotels.Where(x => x.HotelID == item.HotelID).Count() < 1) {
tempDistinctHotels.Add(new Hotel {
HotelID = item.HotelID,
HotelName = item.HotelName
});
var _tempHotel = tempDistinctHotels.Single(x => x.HotelID == item.HotelID);
var _tempRoomList = new List<Room>();
if (_tempHotel.Rooms != null) {
foreach (var _item in _tempHotel.Rooms) {
_tempRoomList.Add(_item);
}
}
_tempRoomList.Add(new Room {
RoomCode = item.Room.RoomCode,
RoomID = item.Room.RoomID,
RoomName = item.Room.RoomName
});
_tempHotel.Rooms = _tempRoomList.AsQueryable();
} else {
var _tempHotel = tempDistinctHotels.Single(x => x.HotelID == item.HotelID);
var _tempRoomList = new List<Room>();
if (_tempHotel.Rooms != null) {
foreach (var _item in _tempHotel.Rooms) {
_tempRoomList.Add(_item);
}
}
_tempRoomList.Add(new Room {
RoomCode = item.Room.RoomCode,
RoomID = item.Room.RoomID,
RoomName = item.Room.RoomName
});
_tempHotel.Rooms = _tempRoomList.AsQueryable();
}
}
#region _output the result
foreach (var item in tempDistinctHotels) {
Console.WriteLine(
"Hotel Name : " + item.HotelName + ", " + "Room Count : " + item.Rooms.Count()
);
foreach (var item2 in item.Rooms) {
Console.WriteLine("--" + item2.RoomCode + ", " + item2.RoomName);
}
}
#endregion
r.Close();
Console.Read();
}
}
}
}
国际海事组织，如果有最差的C＃代码竞争，我会赢得这场比赛的代码。 （我会吗？）
那么，我做什么最优化的方式是？
对我来说看起来像一个简单的字典，你为什么只创建一个房间的酒店？ –
hi stephan，如果你可以发布一个示例代码，对我来说会很棒。 – tugberk