Home Database Mysql Tutorial 在Mysql存储过程中使用事务实例_MySQL

在Mysql存储过程中使用事务实例_MySQL

Jun 01, 2016 pm 01:17 PM
localhost


CREATE DEFINER=`root`@`localhost` PROCEDURE `createBusiness`(parameter1 int)
BEGIN
    #Routine body goes here...
    DECLARE flag int DEFAULT parameter1;#声明变量flag,将参数值赋给该变量
    DECLARE uuidStr VARCHAR(32);#声明一个长度为32位的字符串
    DECLARE currentTime TIMESTAMP;#声明一个类型为时间戳的变量

    declare err INT default 0;#声明一个整形变量err,默认值是0
    declare continue handler for sqlexception set err=1;#当sqlexception handler捕捉到异常时,设置err=1

    START TRANSACTION;#开始事务

    WHILE flag>0 DO #注意: while不能空实现(在while块中,里面必须有语句)

        #uuid()函数得到的字符串是'6ccd780c-baba-1026-9564-0040f4311e29',剔除里面的-,得到一个32位的字符串
        SET uuidStr = REPLACE(UUID(),'-','') ;
        #得到当前的时间
        SET currentTime = CURRENT_TIMESTAMP();
        #执行插入语句,注意连接字符串的函数concat(str1,str2,...);其中str..也可以是数字类型
        INSERT INTO
                                表名称
                                (id,title,keyword,hasImage,isTodayHead,isShowInHome,isBigness,publishTime,originId,modify_time,isAnalysis)
                     VALUE
                                (uuidStr,CONCAT('事件标题',flag),CONCAT('关键字',flag),1,1,0,0,currentTime,CONCAT('xxxxxxx',flag),currentTime,1);
        #每循环一次,flag要减去1,注意没有flag--的语法
        set flag = flag-1;

        #在这里测试当err=1时,事务是否有了回滚,测试ok
        #IF flag=7 THEN   #注意在procedure中给变量赋值要用到set,或在变量声明时用default来父子,所以=号可以用来比较两边的值是否相等,也可,区别先不去纠结。
                #set err=1;
        #END if;
    END WHILE;

    IF (err=0) THEN
        commit;
        select 'OK';
     ELSE
        rollback;
        select 'err';
     END IF;

END;

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