mysql 存储过程的应用

 MySQL存储过程的创建

 

(1). 格式

MySQL存储过程创建的格式：CREATE
PROCEDURE 过程名 ([过程参数[,...]])

[特性 ...] 过程体

这里先举个例子：

   

mysql> DELIMITER //  

mysql> CREATE PROCEDURE proc1(OUT s int)
 

    -> BEGIN 

    -> SELECT COUNT(*) INTO s FROM user;
 

    -> END 

    -> //  

mysql> DELIMITER ; 
注：

（1）这里需要注意的是DELIMITER
//和DELIMITER ;两句，DELIMITER是分割符的意思，因为MySQL默认以";"为分隔符，如果我们没有声明分割符，那么编译器会把存储过程当成SQL语句进行处理，则存储过程的编译过程会报错，所以要事先用DELIMITER关键字申明当前段分隔符，这样MySQL才会将";"当做存储过程中的代码，不会执行这些代码，用完了之后要把分隔符还原。

（2）存储过程根据需要可能会有输入、输出、输入输出参数，这里有一个输出参数s，类型是int型，如果有多个参数用","分割开。

（3）过程体的开始与结束使用BEGIN与END进行标识。

这样，我们的一个MySQL存储过程就完成了，是不是很容易呢?看不懂也没关系，接下来，我们详细的讲解。

下面的例子主要用到了

Ⅰ. if-then -else语句

Ⅰ.  FOUND_ROWS() 语句

#记录每天的步行、睡眠、体重、消耗卡路里等信息
#userRecordDetail 表中，如果存在当天数据，则修改，否则新增
#userRecord 表中，如果存在，则累加，否则新增
#类型：1步行2睡眠3卡路里消耗4体重
#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;
-- 查看用户是否有详细记录
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是否有用户总记录信息，不存在，则添加，否则修改
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;  -- 结束
-- 插入一条用户记录详细信息
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
--  查看是否有用户总记录信息，不存在，则添加，否则修改
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;
-- 修改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);

如果需要精确到小时，则存储过程语句如下：

#记录每天的步行、睡眠、体重、消耗卡路里等信息
#userRecordDetail 表中，如果存在当天数据，则修改，否则新增
#userRecord 表中，如果存在，则累加，否则新增
#类型：1步行2睡眠3卡路里消耗4体重
#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;
-- 查看用户是否有详细记录
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是否有用户总记录信息，不存在，则添加，否则修改
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; -- 结束
-- 插入一条用户记录详细信息
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
-- 修改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. 创建表的语句如下:

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 '总步数',
`updateTime` datetime DEFAULT NULL,
`createTime` datetime NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=8 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci COMMENT='用户记录总表';

/*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 '今日体重 kg',
`calorie` int(11) DEFAULT '0' COMMENT '今日消耗卡路里',
`stepNum` int(11) DEFAULT '0' COMMENT '今日步数',
`userId` int(11) NOT NULL COMMENT 'fk',
`sleepTimes` int(11) DEFAULT '0' COMMENT '今日睡眠时间 单位：分钟',
`lightSleepTimes` int(11) DEFAULT '0' COMMENT '今日轻度睡眠时间 单位：分钟',
`heavySleepTimes` int(11) DEFAULT '0' COMMENT '今日重度睡眠时间 单位：分钟',
`wakeupNum` int(11) DEFAULT '0' COMMENT '今日唤醒次数',
`updateTime` datetime DEFAULT NULL,
`createTime` datetime NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=26 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci COMMENT='用户记录详细信息表';

/*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;

下面的例子主要用到了

Ⅰ. if-then -else语句