创建折扣代码系统(MySQL/php)

Question

我们有一个产品,付款方式是PayPal.在去PayPal之前需要申请折扣.我们想要创建一个系统,人们可以输入礼品券代码以获得免费产品(即100%折扣)或输入一些代码以获得特定折扣(即SAVE10 - 获得10%的折扣).

有些代码仅供一次使用(即礼品券),有些可以多次使用 - 即SAVE10.有些还会有到期日.

打算用MySQL和php放在一起.

有谁在那里已经完成了这个并把东西放在一起？或者知道我们可以用来节省时间的一些代码？不需要整个购物车只需折扣代码部分..

谢谢.

Answer 1

这实际上是一类功能.你需要一个看起来像这样的类接口

 class ProductDiscount {
   /**
    * Create a NEW discount code and return the instance of
    *
    * @param $code string      the discount code
    * @param $discount float   price adjustment in % (ex:        
    * @param $options array    (optional) an array of options :
    *                            'expire'   => timestamp    (optional)
    *                            'limited'  => int          (optional)
    * @return ProductDiscount                         
    */
   static public function create($code, $discount, $options = NULL);

   /**
    * This essentially validate the code, and return the instance of the
    * discount if the code exists. The method returns null if the discount 
    * is not valid for any reason. If an instance is returned, to apply
    * the discount, one should invoke the "consume()" method of the instance.
    *
    * @param $code string
    *
    * @return ProductDiscount|null
    */
   static public function validate($code);

   private $_code;     // string
   private $_discount; // float
   private $_expire;   // unix timestamp (see time()) or null if unlimited
   private $_count;    // int or null if unlimited

   private function __construct();
   public function getCode();      // return string
   public function getDiscount();  // return float
   public function isLimited();    // return bool; true if $_count || $_expire is not null
   public function getCount();     // returns int; how many of this discount is left or null if unlimited
   public function getExpireDate();// returns int (unix timestamp) or null if unlimited

   public function consume();      // apply this discount now

   public function consumeAll();   // invalidate this discount for future use
}

DB表可能如下所示

id UNSIGNED INT(10) NOT NULL AUTOINCREMENT  -- (Primary Key)
code VARCHAR(12) NOT NULL                   -- (Indexed, unique)
discount UNSIGNED INT(3) NOT NULL           -- percent value 0..100
expire DATETIME DEFAULT NULL                -- unlimited by default
count INT(10) DEFAULT 1                     -- can be NULL

注意:验证过程可能只是一个简单的SELECT声明:

SELECT * 
  FROM tblproductdiscount
 WHERE code = {$code}                  -- $code = mysql_real_escape_string($code)
   AND (count IS NULL OR count > 0)
   AND (expire IS NULL or expire > NOW())

然后在验证结帐表单时使用此类.例如,

if (!empty($discountCode)) {
   $discount = ProductDiscount::validate($discountCode);

   if ($discount !== null) {
      $price *= (1 - $discount->getDiscount());
      $discount->consume();
   }
}

嗯,这有点像我会这样做.