require "database.php";

 $po_code = "YMWF2015-6-25-1";
 $customer = "youmei";
 $confirm_date = "2015-6-25";
 $delivery_date = "2015-7-25";

 $create_order_sql =  "INSERT INTO `ld_crm`.`order` (`id`, `po_code`, `customer`, `confirm_date`, `delivery_date`) VALUES (NULL, '$po_code', '$customer', '$confirm_date', '$delivery_date')";//注意此处前面的`ld_crm`中并不是单引号而是esc下面那个按键的符号。后面的VALUES中的变量不能用双引号代替单引号，单引号前面不能有\转义字符

     }   }