MYSQL存储过程遍历结果集游标 从一张表插入数据到另一张表

从一张表往另一张表插入数据时，有一个字段没有需要手动填入，使用了SUBSTRING方法，代码如下

CREATE DEFINER=`root`@`%` PROCEDURE `insertPresale`()
BEGIN
	#Routine body goes here...
	DECLARE done INT DEFAULT 0;  /*用于判断是否结束循环*/
	DECLARE goodsId VARCHAR(255);#标记商品id
	DECLARE flag INT DEFAULT 0;#标记数据库是否包含此条商品记录
	/*用于存储结果集的记录*/
	/*定义游标*/
	DECLARE idCur CURSOR FOR SELECT goods_id FROM `sys_goods_publish` WHERE presale= 1 AND presale_time <= NOW();
	/*定义 设置循环结束标识done值怎么改变 的逻辑*/
	DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1; /*done = true;亦可*/
	OPEN idCur;  /*打开游标*/
	/* 循环开始 */
	REPEAT
	#/* 如果要fetch多列应该这样写，fetch cur/*对应下面的idCur*/
	FETCH idCur INTO goodsId;  /*还可以fetch多列（假设结果集的记录不是单列的话）*/
	IF NOT done THEN  /*数值为非0，MySQL认为是true*/
		SELECT COUNT(*) INTO flag FROM `itemsinfonew` WHERE TaoBaoitemId = goodsId;
		IF (flag>0) THEN #如果数据库中有爬取此条记录则删除已用户发布的为准
			DELETE FROM `itemsinfonew` WHERE TaoBaoitemId = goodsId;
		END IF;
		INSERT INTO `itemsinfonew` (TaoBaoitemId,CouponID,CreateSourceName) 
			SELECT goods_id,coupon_id,SUBSTRING("customer_fd",0.5) 
				FROM `sys_goods_publish` 
					WHERE  presale_time <= NOW() AND goods_id = goodsId;
		UPDATE `sys_goods_publish` SET presale = 0 WHERE presale= 1 AND presale_time <= NOW() AND goods_id = goodsId;
	END IF;
	UNTIL done END REPEAT;
	CLOSE idCur;  /*关闭游标*/
END