需要對以下代碼進行動態插入查詢

Question

對於以下代碼，我在執行之前不知道列表框項目，因此我需要動態查詢選擇以下代碼;

  string selectedTable = cmbImportItemList.Text; 

      string col1 = opLstCsl3.Items[0].ToString(); 
      string col2 = opLstCsl3.Items[1].ToString(); 
      string col3 = opLstCsl3.Items[2].ToString(); 
      string col4 = opLstCsl3.Items[3].ToString(); 
      string col5 = opLstCsl3.Items[4].ToString(); 
      string col6 = opLstCsl3.Items[5].ToString(); 
      string col7 = opLstCsl3.Items[6].ToString(); 
      string col8 = opLstCsl3.Items[7].ToString(); 
      //string[] coll = new string[100]; 
      //string col9 = opLstCsl3.Items[8].ToString(); 
      //'"+col1+"','"+col2+"','"+col3+"','"+col4+"' 
      using (SqlDataAdapter adater = new SqlDataAdapter("Select " + col1 + "," + col2 + "," + col3 + "," + col4 + "," + col5 + "," + col6 + "," + col7 + "," + col8 + " from " + selectedTable, new SqlConnection(Properties.Settings.Default.connectionstring2))) 
      { 
       adater.Fill(dttt); 
      } 

Answer 1

我寫了一個存儲過程的查詢，首先在數據庫中執行此，

CREATE PROCEDURE GetData @colName nvarchar(500) = NULL,@tableName nvarchar(50)=NULL 
AS 
DECLARE @sqlText nvarchar(1000); 
SET @sqlText = N'SELECT ' + @colName + ' FROM ' + @tableName 
Exec (@sqlText) 
GO 

，讓你列用逗號分隔的像下面

string selectedTable = cmbImportItemList.Text; 
string columns = string.Empty; 
foreach (var item in pLstCsl3.Items) 
{ 
    columns += item + ','; 
} 

最後請撥打存儲過程如下，

using (SqlConnection con = new SqlConnection(Properties.Settings.Default.connectionstring2)) { 
    con.Open(); 

    SqlCommand cmd = new SqlCommand("GetData", con); 
    cmd.CommandType = CommandType.StoredProcedure; 
    cmd.Parameters.Add(new SqlParameter("@colName", columns)); 
    cmd.Parameters.Add(new SqlParameter("@tableName", selectedTable)); 

    using (SqlDataReader rdr = cmd.ExecuteReader()) { 

     while (rdr.Read()) 
     { 
      // do what ever you want with your records. 
     } 
    } 
} 

希望它可以幫助

如果你想了解有關存儲過程的參考以下鏈接， http://www.codeproject.com/Articles/126898/Sql-Server-How-to-write-a-Stored-procedure-in-Sql

感謝 斯萬