OLEDB操作EXCEL

 OLEDB对EXCEL进行增删改查

       Microsoft.Office.Interop.Excel.ApplicationClass 将DataTable中的数据插入EXCEL

        /// <summary>
        /// 将DataSet里所有数据导入Excel.
        /// 需要添加COM: Microsoft Excel Object Library.
        /// using Excel;
        /// </summary>
        /// <param name="filePath">Excel文件的路径</param>
        /// <param name="ds">到导入Excel的数据源</param>
        private void ExportToExcel(string filePath, DataSet ds)
        {
            object oMissing = System.Reflection.Missing.Value;
            Microsoft.Office.Interop.Excel.ApplicationClass xlApp = new Microsoft.Office.Interop.Excel.ApplicationClass();
            try
            {
                //打开EXCEL文件
                Microsoft.Office.Interop.Excel.Workbook xlWorkbook = xlApp.Workbooks.Open(filePath, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing);
                // Excel.Workbook xlWorkbook=xlApp.Workbooks.只有Open属性，没有Write属性
                Microsoft.Office.Interop.Excel.Worksheet xlWorksheet;
                //循环所有DataTable
                for (int i = 0; i < ds.Tables.Count; i++)
                {
                    //添加入一个新的Sheel页
                    xlWorksheet = (Microsoft.Office.Interop.Excel.Worksheet)xlWorkbook.Worksheets.Add(oMissing, oMissing, 1, oMissing);
                    //以TableName作为新加的sheel页名
                    xlWorksheet.Name = ds.Tables[i].TableName;
                    //取出这个DataTable中的所有值，暂时存于stringBuffer中
                    StringBuilder stringBuffer =new StringBuilder();
                   
                    for (int j = 0; j < ds.Tables[i].Rows.Count; j++)
                    {
                        for (int k = 0; k < ds.Tables[i].Columns.Count; k++)
                        {
                            stringBuffer.Append( ds.Tables[i].Rows[j][k].ToString());
                            if (k < ds.Tables[i].Columns.Count - 1)
                                stringBuffer.Append("\t");
                        }
                        stringBuffer.Append("\n");
                    }
                    //利用系统剪贴板
                    System.Windows.Forms.Clipboard.SetDataObject("");
                    //将stringBuffer放入剪贴板
                    System.Windows.Forms.Clipboard.SetDataObject(stringBuffer);
                    //选中这个sheel页中的第一个单元格
                    ((Excel.Range)xlWorksheet.Cells[1, 1]).Select();
                    //粘贴
                    xlWorksheet.Paste(oMissing, oMissing);
                    //清空系统剪贴板
                    System.Windows.Forms.Clipboard.SetDataObject("");
                }
                //保存并关闭这个工作薄
                xlWorkbook.Close(Microsoft.Office.Interop.Excel.XlSaveAction.xlSaveChanges, oMissing, oMissing);
                System.Runtime.InteropServices.Marshal.ReleaseComObject(xlWorkbook);
                xlWorkbook = null;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                //释放...
                xlApp.Quit();
                System.Runtime.InteropServices.Marshal.ReleaseComObject(xlApp);
                xlApp = null;
                GC.Collect();
            }
        }

       

        OleDbConnection connection;

        //打开数据库连接
        public void OpenConnection(string xlsFils) {
            if (!File.Exists(xlsFils))
            {
                MessageBox.Show("文件\"" + xlsFils + "\"不存在", "提示");

                return;
            }
            string conn = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source =" + xlsFils + ";Extended Properties=Excel 8.0";
            connection = new OleDbConnection(conn);
            connection.Open();
        }

        //查询数据
        public DataTable Select()
        {
            DataTable dt = new DataTable();
            string Sql = "select * from [Sheet1$]";
            OleDbDataAdapter mycommand = new OleDbDataAdapter(Sql, connection);
            mycommand.Fill(dt);
            return dt;
        }
         

        private void Form1_Load(object sender, EventArgs e)
        {
            string xlsFile = System.Windows.Forms.Application.StartupPath + "/" + "ExcelFiles/test.xls";
            OpenConnection(xlsFile);
        }

        //插入数据
        public void Insert()
        {
            string sql = string.Format("insert into [Sheet1$] values('{0}','{1}','{2}')", "陈太汉", "陈晓玲", "520");
            OleDbCommand myCommand = new OleDbCommand(sql, connection);
            myCommand.ExecuteNonQuery();
            Select();
        }

        private void btAdd_Click(object sender, EventArgs e)
        {
            Insert();
        }

        //Excel不支持SQl语句的方式进行删除，可以用把每个字段的值设为空的方式进行删除
        public void Delete()
        {
            string sql = string.Format("Update [Sheet1$] set col1=NULL,col2=NULL,col3=NULL where col1='{0}'", "陈太汉");
            OleDbCommand myCommand = new OleDbCommand(sql, connection);
            myCommand.ExecuteNonQuery();
            Select();
        }

        private void btDelete_Click(object sender, EventArgs e)
        {
            Delete();
        }

        //更新数据
        private new void Update() {
            string sql = string.Format("update  [Sheet1$] set col1='{0}' where col1='{1}'", "陈晓玲","陈太汉");
            OleDbCommand myCommand = new OleDbCommand(sql, connection);
            myCommand.ExecuteNonQuery();
            Select();
        }
        private void btUpdate_Click(object sender, EventArgs e)
        {
            Update();
        }

        private void btSelect_Click(object sender, EventArgs e)
        {
            Select();
        }