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 ([过程參数[,...]])
[特性 ...] 过程体

这里先举个样例：
   

  1. mysql> DELIMITER //  
  2. mysql> CREATE PROCEDURE proc1(OUT s int)  
  3.     -> BEGIN 
  4.     -> SELECT COUNT(*) INTO s FROM user;  
  5.     -> END 
  6.     -> //  
  7. mysql> DELIMITER ; 

注：

（1）这里须要注意的是DELIMITER //和DELIMITER ;两句，DELIMITER是切割符的意思，由于MySQL默认以";"为分隔符。假设我们没有声明切割符，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DELIMITERkeyword申明当前段分隔符。这样MySQL才会将";"当做存储过程中的代码。不会运行这些代码，用完了之后要把分隔符还原。

（2）存储过程依据须要可能会有输入、输出、输入输出參数，这里有一个输出參数s。类型是int型，假设有多个參数用","切割开。

（3）过程体的開始与结束使用BEGIN与END进行标识。

这样。我们的一个MySQL存储过程就完毕了。是不是非常easy呢?

看不懂也没关系。接下来，我们具体的解说。



以下的样例主要用到了

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，假设存在当天数据，则改动，否则新增
#userRecord 表中，假设存在，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;  
    -- 查看用户是否有具体记录
    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是否实用户总记录信息，不存在，则加入，否则改动
        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
        -- 插入一条用户记录具体信息
        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
       --  查看是否实用户总记录信息，不存在。则加入，否则改动
        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;
         -- 改动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);


假设须要精确到小时。则存储过程语句例如以下：

#记录每天的步行、睡眠、体重、消耗卡路里等信息
#userRecordDetail 表中，假设存在当天数据。则改动，否则新增
#userRecord 表中，假设存在，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;
    -- 查看用户是否有具体记录
    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是否实用户总记录信息，不存在。则加入，否则改动
        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
        -- 插入一条用户记录具体信息
        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
        -- 改动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 '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='用户记录具体信息表';

/*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;





以下的样例主要用到了

Ⅰ. if-then -else语句

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原文地址：https://www.cnblogs.com/lcchuguo/p/5209409.html