[英]MySQL Stored Procedure Select Check Insert
因此,我試圖在MySQL 5.5版中創建一個存儲過程。 我不確定什么是錯的,但是我想完成的是。
從表A獲取記錄,該記錄已存在7天了。 然后插入表B,但是我需要檢查表B中是否存在。如果存在,則跳過,否則插入。
所以這是我的代碼:
DROP PROCEDURE IF EXISTS `move_record`;
DELIMITER //
CREATE PROCEDURE `move_record`()
BEGIN
DECLARE done INT DEFAULT FALSE;
DECLARE dt DATETIME;
DECLARE uid,value BIGINT(20);
DECLARE category VARCHAR(30);
DECLARE data,comments VARCHAR(255);
DECLARE cancel TINYINT(1) DEFAULT NULL;
DECLARE curs CURSOR FOR SELECT `datetime`,user_id,category,data,comments,cancel FROM `record` WHERE `datetime` < DATE_SUB(CURDATE(), INTERVAL 7 DAY);
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
OPEN curs;
myloop: LOOP
FETCH NEXT FROM curs INTO dt,uid,category,data,comments,cancel;
IF done THEN
LEAVE myloop;
END IF;
IF NOT EXISTS (SELECT * FROM `record_arc`
WHERE record_arc.`datetime` = dt
AND record.user_id = uid )
INSERT INTO `record_arc` (`datetime`,user_id,category,data,comments,cancel) VALUES (dt,uid,category,data,comments,cancel);
END IF;
END LOOP myloop;
CLOSE curs;
DEALLOCATE curs;
END//
DELIMITER ;
也許您可以無循環執行此操作。
INSERT INTO `record_arc`(
`datetime`,
user_id,
category,
data,
comments,
cancel
)
SELECT
`datetime`,
user_id,
category,
data,
comments,
cancel
FROM `record` r
WHERE
`datetime` < DATE_SUB(CURDATE(), INTERVAL 7 DAY)
AND NOT EXISTS(
SELECT 1
FROM `record_arc` r2
WHERE
r2.`datetime` = r.`datetime`
AND r2.user_id = r.user_id
)
別名錯誤地使用了它。 檢查以下代碼
IF NOT EXISTS (SELECT 1 FROM `record_arc`
WHERE record_arc.`datetime` = dt
AND record_arc.user_id = uid )
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