计数器按照，商品起订量和最小包装量，选择步数和校验

**计数器系统设计**

计数器系统是用于管理商品数量的系统，它可以根据商品的起订量和最小包装量进行设置。下面我们将设计一个计数器系统，包括选择步数和校验功能。

###1. 系统需求* 商品有起订量和最小包装量* 计数器系统需要能够根据商品的数量进行设置* 需要选择步数和校验功能###2. 系统设计####2.1 商品信息表首先，我们需要创建一个商品信息表来存储商品的基本信息，包括商品名称、起订量和最小包装量。

sqlCREATE TABLE goods (
 id INT PRIMARY KEY,
 name VARCHAR(255),
 min_order_quantity INT,
 min_package_quantity INT);

sqlCREATE TABLE counters (
 id INT PRIMARY KEY,
 goods_id INT,
 quantity INT,
 step INT,
 check_status INT,
 FOREIGN KEY (goods_id) REFERENCES goods(id)
);

sqlCREATE FUNCTION get_min_order_quantity(goods_id INT) RETURNS INTBEGIN DECLARE min_order_quantity INT;
 SELECT min_order_quantity INTO min_order_quantity FROM goods WHERE id = goods_id;
 RETURN min_order_quantity;
END;

CREATE FUNCTION get_min_package_quantity(goods_id INT) RETURNS INTBEGIN DECLARE min_package_quantity INT;
 SELECT min_package_quantity INTO min_package_quantity FROM goods WHERE id = goods_id;
 RETURN min_package_quantity;
END;

CREATE FUNCTION set_counter(goods_id INT, quantity INT, step INT) RETURNS INTBEGIN DECLARE current_quantity INT;
 UPDATE counters SET quantity = quantity +1, step = step WHERE goods_id = goods_id AND quantity = current_quantity;
 IF ROW_COUNT() =0 THEN INSERT INTO counters (goods_id, quantity, step) VALUES (goods_id,1, step);
 END IF;
 RETURN1;
END;

CREATE FUNCTION check_counter(goods_id INT, quantity INT) RETURNS INTBEGIN DECLARE min_order_quantity INT;
 DECLARE min_package_quantity INT;
 SELECT min_order_quantity INTO min_order_quantity FROM goods WHERE id = goods_id;
 SELECT min_package_quantity INTO min_package_quantity FROM goods WHERE id = goods_id;
 IF quantity >= min_order_quantity AND quantity % min_package_quantity =0 THEN RETURN1;
 ELSE RETURN0;
 END IF;
END;

sql-- 创建商品信息表INSERT INTO goods (id, name, min_order_quantity, min_package_quantity) VALUES (1, '商品A',10,5);

-- 设置计数器SET counter(1,15,2);

-- 检查计数器SELECT check_counter(1,15);