SQLServer数据库读取数据在Excel中显示

          

.在WinForm界面和sqlServer数据库进行连接读取使用using System.Data.sqlClient;命名空间下的sqlDataAdapter,sqlCommand,sqlReader等，但是当我们要向Excel中读取时需要使用ADODB命名空间下的方法得到DataResult直接复制将减少大量的循环写入，从而省去大量的时间，注意Connction关闭的时间，如果提前关闭则第二个方法将不能读取：
private ADODB.Connection conn = null;
        private ADODB.Recordset rs = null;
        public Recordset GetRecordSet()
        {
            String strConn = @"PROVIDER=sqlOLEDB;SERVER=localhost;DATABASE=ZHANG_DL";
            conn = new ADODB.Connection();
            conn.ConnectionString = strConn;

            try
            {
                conn.Open(strConn,"sa","",-1);//这个方法的各个参数自己设定，根据自己的设置
             
            }
            catch (Exception ee)
            {
                throw new Exception(ee.Message);
            }
            finally
            {
              
                Console.WriteLine(conn.State);
            }
            rs = new ADODB.Recordset();
            String sql = "SELECT * FROM T_EMPLOYEE";//从数据库的Employee表格的内容进行读取
            rs.Open(sql,conn,CursorTypeEnum.adOpenKeyset,LockTypeEnum.adLockBatchOptimistic,(int)ADODB.CommandTypeEnum.adCmdText);//查一下每个参数的意义
         
            return rs;
        }

        public void ShowInExcel(ADODB.Recordset rs)
        {
           
           String path=@"C:\Users\Administrator\Documents\book2.xlsx";//这个路径名可以根据前面的openFileDialog的方法动态的设定读取
            object missing = System.Reflection.Missing.Value;
            System.Globalization.CultureInfo currentCI = System.Threading.Thread.CurrentThread.CurrentCulture;
            System.Threading.Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("en-US");

            Microsoft.Office.Interop.Excel.Application app = new Microsoft.Office.Interop.Excel.Application();
            Microsoft.Office.Interop.Excel.Workbook wb = null;
            Microsoft.Office.Interop.Excel.Worksheet sheet = null;
            Microsoft.Office.Interop.Excel.Range rg = null;

            wb = app.Workbooks.Add(true);

            try
            {
                sheet = (Microsoft.Office.Interop.Excel.Worksheet)wb.Sheets[1];
                app.Application.displayAlerts = false;
                app.Application.Visible = false;
                sheet.Cells[1,1] = "EMPLOYEE_ID";
                sheet.Cells[1,2] = "EMPLOYEE_NAME";
                sheet.Cells[1,3] = "EMPLOYEE_AGE";
                sheet.Cells[1,4] = "EMPLOYEE_PHONE_NUMBER";
                sheet.Cells[1,5] = "EMPLOYEE_AGE";

                rg = sheet.get_Range(sheet.Cells[2,1],sheet.Cells[10,5]);
               // rg.Select();
                rg.copyFromrecordset(rs,missing,missing);
                sheet.Columns.EntireColumn.AutoFit();

                wb.SaveAs(path,Type.Missing,Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange,
                    Type.Missing,Type.Missing);
                wb.Close(false,missing);
                wb = null;
                app.Quit();
                app = null;

            }             catch (Exception ee)             {                 throw new Exception(ee.Message);             }             finally             {                 rs.Close();             }         }