/// <summary>
        /// 将Excel数据导入至数据库
        /// </summary>
        /// <param name="fileName">Excel文件名</param>
        /// <param name="tableName">要插入数据库的表名</param>
        /// <param name="CONNECTION">连接字符串</param>
        public static void IOtoSQL(string fileName, string tableName, string CONNECTION)
        {
            SQLTool mysql = new SQLTool();

            mysql.open(CONNECTION);
            try
            {
                DataTable dt = ReadExcelToTable(fileName);
                if (!checkExcel(tableName, dt))
                {
                    throw new Exception("文件格式不符合要求\n请查看帮助信息");
                }

                dt.Columns.Add("autoid", typeof(int));

                mysql.BatchInsert(dt, tableName);

                MessageBox.Show(System.IO.Path.GetFileNameWithoutExtension(fileName) + "\n数据导入成功");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                mysql.close();
            }
        }