1.问题描述:我想要从一个表中查找数据,然后取其中一些字段批量存到另一张表中,刚学习用存储过程,但是一直显示影响0行,不知道是哪里错了,请各位帮帮忙。谢谢了!
2.代码:
BEGIN
#Routine body goes here...
DECLARE id INT DEFAULT 0;
DECLARE user_Id INT DEFAULT 0;
DECLARE course_id INT DEFAULT 0;
DECLARE playercount INT DEFAULT 0;
DECLARE course_name VARCHAR(255);
DECLARE play_time INT DEFAULT 0;
DECLARE finish INT DEFAULT 0;
DECLARE _done TINYINT(1) DEFAULT 0;
DECLARE mian_cur CURSOR FOR SELECT user_id,course_id,SUM(playercount) AS playercount,SUM(play_time) AS play_time,course_name FROM `edu_course_studyhistory` WHERE user_id = userId GROUP BY course_id ;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET _done = 1;
OPEN mian_cur;
loop_xxx:LOOP
FETCH FROM mian_cur INTO user_id,course_id,playercount,play_time,course_name;
IF _done=1 THEN
LEAVE loop_xxx;
END IF;
INSERT INTO edu_course_history VALUES(NULL,user_id,course_id,playercount,course_name,now(),play_time,0);
END LOOP;
END
3.错误信息
从这个edu_course_studyhistory这个表取数据插入edu_course_history这个表么?
1.先确认下有没有数据:
SELECT
user_id,
course_id,
SUM(playercount) AS playercount,
SUM(play_time) AS play_time,
course_name
FROM
`edu_course_studyhistory`
WHERE
user_id = userId
GROUP BY
course_id;
2.试试执行能成功么?
INSERT INTO edu_course_history
VALUES
(
NULL,
user_id,
course_id,
playercount,
course_name,
now(),
play_time,
0
);
看起来没必要用存储过程吧?维护起来还麻烦。
INSERT INTO table1
(field1, field2, ...)
SELECT field1, field2 FROM table2
WHERE ...