游标,存储过程

DELIMITER $$

USE `eloan_tj`$$

DROP PROCEDURE IF EXISTS `pro_d_tender_updatecount`$$

CREATE DEFINER=`dba`@`%` PROCEDURE `pro_d_tender_updatecount`(IN pownerid INT)
BEGIN
 -- 借款成功次数 i=循环标识符
 DECLARE cid,i INT;
 -- 成功借款时间','号分割 2012-03-19,2012-03-19
 DECLARE cdatestr TEXT;
 -- 两次时间
 DECLARE dateS,dateE VARCHAR(50); 
 SET i = 1; 
 -- 借款成功次数,借款成功时间
 SELECT 
 COUNT(DISTINCT FROM_UNIXTIME(cdate,'%Y-%m-%d')),GROUP_CONCAT(DISTINCT FROM_UNIXTIME(cdate,'%Y-%m-%d') ORDER BY cdate) 
 INTO cid,cdatestr FROM d_tender_repayment WHERE borrowerid = pownerid;
 SELECT GROUP_CONCAT(DISTINCT FROM_UNIXTIME(cdate,'%Y-%m-%d') ORDER BY cdate) ate INTO cdatestr FROM d_tender_repayment WHERE borrowerid = pownerid;
 
	WHILE i <= cid DO
	 SELECT SUBSTRING_INDEX(cdatestr,',',i-1) INTO dateS; -- 上次时间
	 SELECT SUBSTRING_INDEX(cdatestr,',',i) INTO dateE; -- 这次时间
	 	 
	 SET dateS = UNIX_TIMESTAMP(SUBSTRING_INDEX(dateS,',',-1));-- 上次','最后时间
	 SET dateE = UNIX_TIMESTAMP(SUBSTRING_INDEX(dateE,',',-1));-- 这次','最后时间
	
	 IF i = 1 THEN
	 UPDATE d_tender SET bidding = 0 WHERE cdate <= dateE AND ownerid = pownerid;
 ELSE
 UPDATE d_tender SET bidding = i-1 WHERE cdate >= dateS AND cdate <= dateE AND ownerid = pownerid;
 END IF; 
 SET i= i +1; 
	END WHILE;
	-- 大于最后时间
	UPDATE d_tender SET bidding = cid WHERE cdate >= dateE AND ownerid = pownerid;
 -- 未借款成功	
	UPDATE d_tender SET bidding = 0 WHERE bidding IS NULL;

END$$

DELIMITER ;

CALL pro_d_tender(94)

SELECT ownerid,bidding,FROM_UNIXTIME(cdate,'%Y-%m-%d') FROM d_tender WHERE ownerid = 94
-- 2012-05-17
-- 2013-06-25
-- 2013-09-04
-- 2013-12-11
SELECT DISTINCT FROM_UNIXTIME(cdate,'%Y-%m-%d') ate FROM d_tender_repayment WHERE borrowerid =94;

SELECT ownerid,bidding,FROM_UNIXTIME(cdate,'%Y-%m-%d') FROM d_tender WHERE ownerid = 416
-- 2012-03-19
-- 2012-09-19
SELECT DISTINCT FROM_UNIXTIME(cdate,'%Y-%m-%d') ate FROM d_tender_repayment WHERE borrowerid =416;


UPDATE d_tender SET bidding = NULL 


CALL pro_updatecount


SELECT * FROM d_tender


DROP PROCEDURE IF EXISTS pro_updatecount;
DELIMITER $$
CREATE PROCEDURE pro_updatecount()
BEGIN
	-- 声明一个标志done， 用来判断游标是否遍历完成
	DECLARE done INT DEFAULT 0;

	-- 声明一个变量，用来存放从游标中提取的数据
	-- 特别注意这里的名字不能与由游标中使用的列明相同，否则得到的数据都是NULL
	DECLARE pownerid VARCHAR(50) DEFAULT NULL;

	-- 声明游标对应的 SQL 语句
	DECLARE cur CURSOR FOR
	SELECT ownerid FROM d_tender GROUP BY ownerid;

	-- 在游标循环到最后会将 done 设置为 1
	DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
	-- 执行查询
	OPEN cur;
	-- 遍历游标每一行
	REPEAT
	-- 把一行的信息存放在对应的变量中
	FETCH cur INTO pownerid;
	IF NOT done THEN
	-- 这里就可以使用 pownerid对应的信息了
	CALL pro_d_tender_updatecount(pownerid);
	END IF;
 	UNTIL done END REPEAT;
	CLOSE cur;
END
$$
DELIMITER ;