有很多連接和參數的SQL語句

我有一個很長的select語句，它有很多參數和Inner join。有很多連接和參數的SQL語句

我的第一個問題：有沒有辦法讓它更有效率？

~~我的第二個問題是爲什麼它不顯示文本框中的任何東西？~~

~~我的目標是顯示來自搜索的房子。~~

~~用戶首先選擇在組合框中的一切（所有參數），然後我選擇穿過表屬性，並在文本框中顯示可用的房屋~~

 clsDataSource.mycon = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\..."); 
     clsDataSource.mycon.Open(); 

     OleDbCommand mycmd = new OleDbCommand("SELECT AreaSize.*, Bathrooms.*, Cities.*, Prices.*,Properties.*, Rooms.*, Types.*, Users.* FROM Users INNER JOIN (Types INNER JOIN (Rooms INNER JOIN (Prices INNER JOIN (Cities INNER JOIN (Bathrooms INNER JOIN (AreaSize INNER JOIN Properties ON AreaSize.AreaSizeID = Properties.AreaSize) ON Bathrooms.BathroomID = Properties.Bathrooms) ON Cities.CityID = Properties.City) ON Prices.PriceID = Properties.Price) ON Rooms.RoomID = Properties.Rooms) ON Types.TypeID = Properties.PropertyType) ON Users.UserID = Properties.AgentID WHERE [email protected] AND [email protected] AND [email protected] AND [email protected] AND [email protected] AND [email protected] AND (Properties.BoolAgent = true)", clsDataSource.mycon); 

     mycmd.Parameters.Add("@city", OleDbType.Integer, 3).Value = clsHouses.location; 
     mycmd.Parameters.Add("@propertyType", OleDbType.Integer, 3).Value = clsHouses.type; 
     mycmd.Parameters.Add("@rooms", OleDbType.Integer, 3).Value = clsHouses.bedrooms; 
     mycmd.Parameters.Add("@areasize", OleDbType.Integer, 3).Value = clsHouses.surface; 
     mycmd.Parameters.Add("@price ", OleDbType.Integer, 3).Value = clsHouses.price; 
     mycmd.Parameters.Add("@bathrooms", OleDbType.Integer, 3).Value = clsHouses.bathrooms; 

     myadaptS = new OleDbDataAdapter(mycmd); 
     myadaptS.Fill(clsDataSource.myset, "ResultSearch"); 
     tbSearchResult = clsDataSource.myset.Tables["Properties"]; 


     txtType.Text = tbSearchResult.Rows[idx]["DescriptionType"].ToString();

來源

2016-12-01 NewPassionnate

我會做一個視圖在你的連接之上的數據庫中。並從中選擇而不是表格。 – user1681317

 clsDataSource.mycon = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\..."); 
     clsDataSource.mycon.Open(); 
     clsDataSource.myset = new DataSet(); 
     current = 0; 

     OleDbCommand mycommand = new OleDbCommand("SELECT AreaSize.*, Bathrooms.*, Cities.*, Prices.*,Properties.*, Rooms.*, Types.*, Users.* FROM Users INNER JOIN (Types INNER JOIN (Rooms INNER JOIN (Prices INNER JOIN (Cities INNER JOIN (Bathrooms INNER JOIN (AreaSize INNER JOIN Properties ON AreaSize.AreaSizeID = Properties.AreaSize) ON Bathrooms.BathroomID = Properties.Bathrooms) ON Cities.CityID = Properties.City) ON Prices.PriceID = Properties.Price) ON Rooms.RoomID = Properties.Rooms) ON Types.TypeID = Properties.PropertyType) ON Users.UserID = Properties.AgentID WHERE [email protected] AND [email protected] AND [email protected] AND [email protected] AND [email protected] AND [email protected] AND (Properties.BoolAgent = true)", clsDataSource.mycon); 
     mycommand.Parameters.Add("@propertyType", OleDbType.Integer).Value = clsHouses.type; 
     mycommand.Parameters.Add("@city", OleDbType.Integer).Value = clsHouses.location; 
     mycommand.Parameters.Add("@rooms", OleDbType.Integer).Value = clsHouses.bedrooms; 
     mycommand.Parameters.Add("@areasize", OleDbType.Integer).Value = clsHouses.surface; 
     mycommand.Parameters.Add("@price", OleDbType.Integer).Value = clsHouses.price; 
     mycommand.Parameters.Add("@bathrooms", OleDbType.Integer).Value = clsHouses.bathrooms; 
     mycommand.Parameters.Add("@address", OleDbType.VarChar).Value = txtAddress.Text; 
     mycommand.Parameters.Add("@description", OleDbType.VarChar).Value = txtDescription.Text; 

     mycommand.CommandType = CommandType.Text; 


     myadaptL = new OleDbDataAdapter(mycommand); 
     myadaptL.Fill(clsDataSource.myset, "Properties"); 
     tbListing = clsDataSource.myset.Tables["Properties"]; 
     //FillCombobox(); 
     TAB2TXT(current);

來源

2016-12-01 06:32:31 NewPassionnate

有很多連接和參數的SQL語句

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