mysql 存儲過程的應用
阿新 • • 發佈：2019-03-08
double sel .net mes comment 原創文章 where update 我們
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?MySQL存儲過程的創建
?
(1).?格式
MySQL存儲過程創建的格式：CREATE
PROCEDURE?過程名?([過程參數[,...]])
[特性?...] ?過程體
這裏先舉個樣例：
???
- mysql>?DELIMITER?// ?
- mysql>?CREATE?PROCEDURE?proc1(OUT?s?int) ?
- ????->?BEGIN?
- ????->?SELECT?COUNT(*)?INTO?s?FROM?user; ?
- ????->?END?
- ????->?// ?
- mysql>?DELIMITER?;?
註：
（1）這裏須要註意的是DELIMITER
//和DELIMITER ;兩句。DELIMITER是切割符的意思，由於MySQL默認以";"為分隔符，假設我們沒有聲明切割符，那麽編譯器會把存儲過程當成 SQL語句進行處理，則存儲過程的編譯過程會報錯，所以要事先用DELIMITERkeyword申明當前段分隔符。這樣MySQL才會將";"當做存儲過程中的代碼。不會運行這些代碼，用完了之後要把分隔符還原。
（2）存儲過程依據須要可能會有輸入、輸出、輸入輸出參數，這裏有一個輸出參數s，類型是int型。假設有多個參數用","切割開。
（3）過程體的開始與結束使用BEGIN與END進行標識。
這樣，我們的一個MySQL存儲過程就完畢了，是不是非常easy呢?看不懂也沒關系，接下來，我們具體的解說。
以下的樣例主要用到了
Ⅰ. if-then -else語句
Ⅰ. ?FOUND_ROWS()? 語句
#記錄每天的步行、睡眠、體重、消耗卡路裏等信息
#userRecordDetail 表中，假設存在當天數據，則改動。否則新增
#userRecord 表中，假設存在，則累加，否則新增
#類型：1步行2睡眠3卡路裏消耗4體重
#CALL userRecord_create(1001,45,100,1000,1000,500,500,2,1);
DROP PROCEDURE IF EXISTS pro_userRecord_stepNum;
DELIMITER //
CREATE PROCEDURE pro_userRecord_stepNum(IN p_userId INT,IN p_stepNum INT)
BEGIN
DECLARE RCount INT;
-- 查看用戶是否有具體記錄
SELECT id FROM userRecordDetail WHERE userId = p_userId AND DATE(createTime) = CURDATE() LIMIT 1;
SELECT FOUND_ROWS() INTO RCount;
IF (RCount=0) THEN
-- 查看userRecord是否實用戶總記錄信息，不存在，則加入，否則改動
SELECT id FROM userRecord WHERE userId = p_userId LIMIT 1;
SELECT FOUND_ROWS() INTO RCount;
IF(RCount = 0 )THEN
INSERT INTO `userRecord`(`userId`,`totalStep`,`updateTime`,`createTime`)
VALUES (p_userId,p_stepNum,NOW(),NOW());
ELSE
UPDATE userRecord SET totalStep = totalStep+p_stepNum WHERE userId = p_userId;
END IF; -- 結束
-- 插入一條用戶記錄具體信息
INSERT INTO `userRecordDetail`(`weigh`,`calorie`,`stepNum`,`userId`,
`sleepTimes`,`lightSleepTimes`,`heavySleepTimes`,
`wakeupNum`,`updateTime`,`createTime`)
VALUES (0,0,p_stepNum, p_userId,0,0,0,0,NOW(),NOW());
ELSE
-- 查看是否實用戶總記錄信息，不存在。則加入，否則改動
SELECT id FROM userRecord WHERE userId = p_userId LIMIT 1;
SELECT FOUND_ROWS() INTO RCount;
IF(RCount = 0 )THEN
INSERT INTO `userRecord`(`userId`,`totalStep`,`updateTime`,`createTime`)
VALUES (p_userId,p_stepNum,NOW(),NOW());
ELSE
UPDATE userRecord SET totalStep = totalStep + p_stepNum WHERE userId = p_userId;
END IF;
-- 改動userRecordDetail
UPDATE userRecordDetail SET stepNum = stepNum + p_stepNum WHERE userId = p_userId;
END IF;
END;//
DELIMITER ;
SHOW WARNINGS;
SHOW CREATE PROCEDURE pro_userRecord_stepNum;
CALL pro_userRecord_stepNum(1009,111); 假設須要精確到小時，則存儲過程語句例如以下：
#記錄每天的步行、睡眠、體重、消耗卡路裏等信息
#userRecordDetail 表中。假設存在當天數據。則改動，否則新增
#userRecord 表中，假設存在，則累加，否則新增
#類型：1步行2睡眠3卡路裏消耗4體重
#CALL userRecord_create(1001,45,100,1000,1000,500,500,2,1);
DROP PROCEDURE IF EXISTS pro_userRecord_sleep;
DELIMITER //
CREATE PROCEDURE pro_userRecord_sleep(IN p_userId INT,
IN p_sleepTimes INT ,
IN p_lightSleepTimes INT ,
IN p_heavySleepTimes INT ,
IN p_wakeupNum INT)
BEGIN
DECLARE RCount INT;
DECLARE resultId INT;
-- 查看用戶是否有具體記錄
SELECT id INTO resultId FROM userRecordDetail WHERE userId = p_userId AND DATE_FORMAT(createTime,‘%Y%m%d%H‘) = DATE_FORMAT(NOW(),‘%Y%m%d%H‘) LIMIT 1;
SELECT FOUND_ROWS() INTO RCount;
IF (RCount=0) THEN
-- 查看userRecord是否實用戶總記錄信息。不存在，則加入，否則改動
SELECT id FROM userRecord WHERE userId = p_userId LIMIT 1;
SELECT FOUND_ROWS() INTO RCount;
IF(RCount = 0 )THEN
INSERT INTO `userRecord`(`userId`,`totalStep`,`updateTime`,`createTime`)
VALUES (p_userId,p_stepNum,NOW(),NOW());
ELSE
UPDATE userRecord SET totalStep = totalStep+p_stepNum WHERE userId = p_userId;
END IF; -- 結束
-- 插入一條用戶記錄具體信息
INSERT INTO `userRecordDetail`(`weigh`,`calorie`,`stepNum`,`userId`,
`sleepTimes`,`lightSleepTimes`,`heavySleepTimes`,
`wakeupNum`,`updateTime`,`createTime`)
VALUES (0,0,0, p_userId,p_sleepTimes,p_lightSleepTimes,p_heavySleepTimes,p_wakeupNum,NOW(),NOW());
ELSE
-- 改動userRecordDetail
UPDATE userRecordDetail SET
sleepTimes = sleepTimes + p_sleepTimes,
lightSleepTimes = lightSleepTimes + p_lightSleepTimes,
heavySleepTimes = heavySleepTimes + p_heavySleepTimes,
wakeupNum = wakeupNum + p_wakeupNum
WHERE id = resultId;
END IF;
END;//
DELIMITER ;
SHOW WARNINGS;
SHOW CREATE PROCEDURE pro_userRecord_sleep;
CALL pro_userRecord_sleep(1009,600,100,500,2);
Ⅰ. 創建表的語句例如以下:
DROP TABLE IF EXISTS `userRecord`;
CREATE TABLE `userRecord` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`userId` int(11) NOT NULL COMMENT ‘fk‘,
`totalStep` int(11) DEFAULT ‘0‘ COMMENT ‘總步數‘,
`updateTime` datetime DEFAULT NULL,
`createTime` datetime NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=8 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci COMMENT=‘用戶記錄總表‘;
/*Data for the table `userRecord` */
LOCK TABLES `userRecord` WRITE;
insert into `userRecord`(`id`,`userId`,`totalStep`,`updateTime`,`createTime`) values (1,1001,88000,‘2014-05-16 14:16:50‘,‘2014-05-13 14:16:52‘),(2,1002,35000,‘2014-05-16 14:26:22‘,‘2014-05-12 14:26:24‘),(3,1003,95000,‘2014-05-16 14:28:00‘,‘2014-05-12 14:28:06‘),(4,1007,150000,‘2014-05-16 14:30:31‘,‘2014-04-28 14:30:33‘),(5,1009,288,‘2014-05-19 16:24:26‘,‘2014-05-19 16:24:26‘),(6,1010,33,‘2014-05-19 17:01:50‘,‘2014-05-19 17:01:50‘),(7,1011,33,‘2014-05-19 17:03:31‘,‘2014-05-19 17:03:31‘);
UNLOCK TABLES;
/*Table structure for table `userRecordDetail` */
DROP TABLE IF EXISTS `userRecordDetail`;
CREATE TABLE `userRecordDetail` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`weigh` double DEFAULT ‘0‘ COMMENT ‘今日體重 kg‘,
`calorie` int(11) DEFAULT ‘0‘ COMMENT ‘今日消耗卡路裏‘,
`stepNum` int(11) DEFAULT ‘0‘ COMMENT ‘今日步數‘,
`userId` int(11) NOT NULL COMMENT ‘fk‘,
`sleepTimes` int(11) DEFAULT ‘0‘ COMMENT ‘今日睡眠時間 單位：分鐘‘,
`lightSleepTimes` int(11) DEFAULT ‘0‘ COMMENT ‘今日輕度睡眠時間 單位：分鐘‘,
`heavySleepTimes` int(11) DEFAULT ‘0‘ COMMENT ‘今日重度睡眠時間 單位：分鐘‘,
`wakeupNum` int(11) DEFAULT ‘0‘ COMMENT ‘今日喚醒次數‘,
`updateTime` datetime DEFAULT NULL,
`createTime` datetime NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=26 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci COMMENT=‘用戶記錄具體信息表‘;
/*Data for the table `userRecordDetail` */
LOCK TABLES `userRecordDetail` WRITE;
insert into `userRecordDetail`(`id`,`weigh`,`calorie`,`stepNum`,`userId`,`sleepTimes`,`lightSleepTimes`,`heavySleepTimes`,`wakeupNum`,`updateTime`,`createTime`) values (1,0,0,10000,1001,0,0,0,0,NULL,‘2014-05-16 14:17:53‘),(2,0,0,10000,1001,0,0,0,0,NULL,‘2014-05-15 14:22:58‘),(3,0,0,15000,1001,0,0,0,0,NULL,‘2014-05-14 14:23:56‘),(4,0,0,13000,1001,0,0,0,0,NULL,‘2014-05-13 14:24:10‘),(5,0,0,20000,1001,0,0,0,0,NULL,‘2014-05-12 14:24:32‘),(6,0,0,8000,1001,0,0,0,0,NULL,‘2014-05-11 14:24:51‘),(7,0,0,12000,1001,0,0,0,0,NULL,‘2014-05-09 14:25:02‘),(8,0,0,10000,1002,0,0,0,0,NULL,‘2014-05-16 14:26:50‘),(9,0,0,5000,1002,0,0,0,0,NULL,‘2014-05-15 14:26:58‘),(10,0,0,20000,1002,0,0,0,0,NULL,‘2014-05-14 14:27:14‘),(11,0,0,20000,1003,0,0,0,0,NULL,‘2014-05-16 14:28:46‘),(12,0,0,30000,1003,0,0,0,0,NULL,‘2014-05-15 14:28:54‘),(13,0,0,25000,1003,0,0,0,0,NULL,‘2014-05-13 14:29:01‘),(14,0,0,15000,1003,0,0,0,0,NULL,‘2014-05-12 14:29:07‘),(15,0,0,5000,1003,0,0,0,0,NULL,‘2014-05-08 14:29:39‘),(16,0,0,20000,1007,0,0,0,0,NULL,‘2014-05-16 14:30:45‘),(17,0,0,30000,1007,0,0,0,0,NULL,‘2014-05-15 14:30:54‘),(18,0,0,25000,1007,0,0,0,0,NULL,‘2014-05-14 14:31:02‘),(19,0,0,15000,1007,0,0,0,0,NULL,‘2014-05-13 14:31:10‘),(20,0,0,35000,1007,0,0,0,0,NULL,‘2014-05-12 14:31:18‘),(21,0,0,25000,1007,0,0,0,0,NULL,‘2014-05-11 14:31:26‘),(22,0,0,20000,1007,0,0,0,0,NULL,‘2014-04-30 14:32:02‘),(23,45,111,288,1009,600,100,500,2,‘2014-05-19 16:24:26‘,‘2014-05-19 16:24:26‘),(24,0,66,33,1010,0,0,0,0,‘2014-05-19 17:01:50‘,‘2014-05-19 17:01:50‘),(25,45,33,33,1011,600,100,500,0,‘2014-05-19 17:03:31‘,‘2014-05-19 17:03:31‘);
UNLOCK TABLES;以下的樣例主要用到了
Ⅰ. if-then -else語句
mysql 存儲過程的應用