SQL读取器在创buildexcel文件时需要很多时间

我现在陷入了一个耗时的过程。 我正在用C＃创build一个excel文件，而且我在SQL中有一个存储过程，需要大约2-3分钟来执行并返回一个90K行的结果集。 但是当我尝试在C＃中执行过程并在while循环中读取数据时，我花了30分钟来创build一个excel文件。 这是我的代码

string gpn = cmbGPN.SelectedItem.ToString(); string MRR_Query = " exec sp_MRR_Retention '"+Yr+"','"+Mn+"'"; int xlCol, xlRow, xlMin, xlMax; reader = func.getReader(MRR_Query); object typeMissing = Type.Missing; Excel._Application app = new Excel.Application(); Excel.Workbook workbook = app.Workbooks.Add(typeMissing); Excel.Worksheet sheet = (Excel.Worksheet)workbook.Worksheets.get_Item(1); object misValue = System.Reflection.Missing.Value; sheet.Name = "MRR Retention"; app.ActiveWindow.Zoom = 80; sheet.Application.ActiveWindow.SplitRow = 1; sheet.Application.ActiveWindow.FreezePanes = true; // Column name for raw data sheet sheet.Cells[1, 1] = "Month"; sheet.Cells[1, 2] = "Parent_Name"; sheet.Cells[1, 3] = "Customer_Name"; sheet.Cells[1, 4] = "Customer_Account_No"; sheet.Cells[1, 5] = "Item_Category"; sheet.Cells[1, 6] = "Item_Description_Summary"; sheet.Cells[1, 7] = "Item_Number"; sheet.Cells[1, 8] = "Date_Range"; sheet.Cells[1, 9] = "Activity_Type"; sheet.Cells[1, 10] = "Line_Type"; sheet.Cells[1, 11] = "IBX_Code"; sheet.Cells[1, 12] = "IBX_Country"; sheet.Cells[1, 13] = "Primary_Sales_Rep"; sheet.Cells[1, 14] = "MRC_Amount_USD_Budget_Rate"; sheet.Cells[1, 15] = "Entered_Currency_Code"; sheet.Cells[1, 16] = "MRC_Amount_LC"; sheet.Cells[1, 17] = "UCM_ID"; sheet.Cells[1, 18] = "GAM_TAG"; sheet.Cells[1, 19] = "Client_Services_Manager"; sheet.Cells[1, 20] = "Sales_Program_Type"; sheet.Cells[1, 21] = "SFDC_Account_ID"; sheet.Cells[1, 22] = "Account_Owner"; sheet.Range["A1:W1"].Borders.Color = Color.Black; sheet.Range["A1:W1"].ColumnWidth = 12; sheet.Range["A1:W1"].Interior.Color = Color.YellowGreen; sheet.Range["A1:W1"].Font.Color = Color.Black; sheet.Range["A1:W1"].Font.Bold = true; sheet.Range["A1:W1"].EntireRow.AutoFit(); int row = 2; while (reader.Read()) { sheet.Cells[row, 1] = reader.GetValue(0); sheet.Cells[row, 2] = reader.GetValue(1); sheet.Cells[row, 3] = reader.GetValue(2); sheet.Cells[row, 4] = reader.GetValue(3); sheet.Cells[row, 5] = reader.GetValue(4); sheet.Cells[row, 6] = reader.GetValue(5); sheet.Cells[row, 7] = reader.GetValue(6); sheet.Cells[row, 8] = reader.GetValue(7); sheet.Cells[row, 9] = reader.GetValue(8); sheet.Cells[row, 10] = reader.GetValue(9); sheet.Cells[row, 11] = reader.GetValue(10); sheet.Cells[row, 12] = reader.GetValue(11); sheet.Cells[row, 13] = reader.GetValue(12); sheet.Cells[row, 14] = reader.GetValue(13); sheet.Cells[row, 15] = reader.GetValue(14); sheet.Cells[row, 16] = reader.GetValue(15); sheet.Cells[row, 17] = reader.GetValue(16); sheet.Cells[row, 18] = reader.GetValue(17); sheet.Cells[row, 19] = reader.GetValue(18); sheet.Cells[row, 20] = reader.GetValue(19); sheet.Cells[row, 21] = reader.GetValue(20); sheet.Cells[row, 22] = reader.GetValue(21); row = row + 1; } reader.Close(); //closing the reader and nullify if any recordset is remaining func.CloseCon(); workbook.SaveAs("D:\\MRR_Retention_Auto.xlsx", typeMissing, typeMissing, typeMissing, typeMissing, typeMissing, Excel.XlSaveAsAccessMode.xlExclusive, typeMissing, typeMissing, typeMissing, typeMissing, typeMissing); workbook.Close(true, typeMissing, typeMissing); app.Quit(); 

任何人都可以看看这个问题，并告诉我如何使这个过程快速。 如果我使用SQL数据适配器，它会很快吗？ 期待意见和答复。

Answer 1

如果你真的想要速度（和紧凑的代码），让Excel为你做所有繁重的工作，并使用Microsoft Query（内置于Excel）而不是手工完成。 以下是如何进行查询并将其转换为链接到MS Query的Excel表格的示例：

 string sql = "select * from foo"; string source = "your connection string here"; Excel.ListObject lo = sheet.ListObjects.AddEx(Excel.XlListObjectSourceType.xlSrcQuery, source, true, Excel.XlYesNoGuess.xlGuess, range); try { lo.QueryTable.CommandText = sql; lo.Refresh(); } catch (Exception ex) { ErrorMessage = ex.ToString(); } 

range将是一个Excel Range对象，其中包含您希望输出的左上angular单元格的目标。

如果您不知道连接string是什么样的，最好的办法是通过Excel生成查询，然后进入查询属性，复制并粘贴连接string文本。

另外，如果你的连接是ODBC，那就足够说"DNS=<dns name>;" Excel将从ODBC属性中提取所有连接属性。