遊标由于安全性問題,感覺用到的地方還是比較少,這裡由于測試資料需要批量更新用到了,是以就mark一下。
本次使用遊标目的是:周遊資料表,同時更新DATETIME類型的字段為某範圍内随機時間。
首先是生成範圍内随機日期的sql:
SELECT CONCAT(FLOOR(1980 + (RAND() * 35)),'-',LPAD(FLOOR(1 + (RAND() * 12)),2,0),'-',LPAD(FLOOR(3 + (RAND() * 8)),2,0));
然後是生成随機時間的sql:
SELECT CONCAT(LPAD(FLOOR(0 + (RAND() * 23)),2,0),':',LPAD(FLOOR(0 + (RAND() * 59)),2,0),':',LPAD(FLOOR(0 + (RAND() * 59)),2,0));
将日期和時間拼起來,就可以指派了,下面是存儲過程:
DELIMITER $$
DROP PROCEDURE IF EXISTS `time_cursor`;
CREATE PROCEDURE `time_cursor` ()
BEGIN
DECLARE tcomdate,tjoindate,tquitdate,tbirthdate,tstartdate,tenddate DATETIME;
DECLARE tempno VARCHAR(10);
DECLARE done INT DEFAULT 0;
DECLARE cur CURSOR FOR SELECT empno FROM t_personsales;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
OPEN cur;
FETCH cur INTO tempno;
REPEAT
IF NOT done THEN
SELECT CONCAT(FLOOR(1990 + (RAND() * 25)),'-',LPAD(FLOOR(1 + (RAND() * 12)),2,0),'-',LPAD(FLOOR(3 + (RAND() * 8)),2,0),' ',LPAD(FLOOR(0 + (RAND() * 23)),2,0),':',LPAD(FLOOR(0 + (RAND() * 59)),2,0),':',LPAD(FLOOR(0 + (RAND() * 59)),2,0)) INTO tcomdate;
SELECT CONCAT(FLOOR(2000 + (RAND() * 15)),'-',LPAD(FLOOR(1 + (RAND() * 12)),2,0),'-',LPAD(FLOOR(3 + (RAND() * 8)),2,0),' ',LPAD(FLOOR(0 + (RAND() * 23)),2,0),':',LPAD(FLOOR(0 + (RAND() * 59)),2,0),':',LPAD(FLOOR(0 + (RAND() * 59)),2,0)) INTO tjoindate;
SELECT CONCAT(FLOOR(2010 + (RAND() * 6)),'-',LPAD(FLOOR(1 + (RAND() * 12)),2,0),'-',LPAD(FLOOR(3 + (RAND() * 8)),2,0),' ',LPAD(FLOOR(0 + (RAND() * 23)),2,0),':',LPAD(FLOOR(0 + (RAND() * 59)),2,0),':',LPAD(FLOOR(0 + (RAND() * 59)),2,0)) INTO tquitdate;
SELECT CONCAT(FLOOR(1960 + (RAND() * 40)),'-',LPAD(FLOOR(1 + (RAND() * 12)),2,0),'-',LPAD(FLOOR(3 + (RAND() * 8)),2,0),' ',LPAD(FLOOR(0 + (RAND() * 23)),2,0),':',LPAD(FLOOR(0 + (RAND() * 59)),2,0),':',LPAD(FLOOR(0 + (RAND() * 59)),2,0)) INTO tbirthdate;
SELECT CONCAT(FLOOR(1999 + (RAND() * 10)),'-',LPAD(FLOOR(1 + (RAND() * 12)),2,0),'-',LPAD(FLOOR(3 + (RAND() * 8)),2,0),' ',LPAD(FLOOR(0 + (RAND() * 23)),2,0),':',LPAD(FLOOR(0 + (RAND() * 59)),2,0),':',LPAD(FLOOR(0 + (RAND() * 59)),2,0)) INTO tstartdate;
SELECT CONCAT(FLOOR(1999 + (RAND() * 15)),'-',LPAD(FLOOR(1 + (RAND() * 12)),2,0),'-',LPAD(FLOOR(3 + (RAND() * 8)),2,0),' ',LPAD(FLOOR(0 + (RAND() * 23)),2,0),':',LPAD(FLOOR(0 + (RAND() * 59)),2,0),':',LPAD(FLOOR(0 + (RAND() * 59)),2,0)) INTO tenddate;
UPDATE t_personsales SET COMDATE = tcomdate,JOINDATE = tjoindate,QUITDATE = tquitdate,BIRTHDATE = tbirthdate,CHK_START_DATE = tstartdate, CHK_END_DATE = tenddate where empno = tempno;
END IF;
FETCH cur INTO tempno;
UNTIL done = 1
END REPEAT;
CLOSE cur;
END
然後 call time_cursor(); 大功告成。