mysql 下数据库升级脚本的编写

1 升级时必须得存储过程

 1 /**/
 2 drop procedure if exists pro_upgrade;
 3 DELIMITER //
 4 CREATE DEFINER=`root`@`%` PROCEDURE  `pro_upgrade`( 
 5   exec_boolen    int   ,
 6   sql_str             VARCHAR(256)  
 7 )
 8 BEGIN    
 9     # 执行sql 操作
10     IF sql_str <>'' 
11     THEN  
12       set @sql1 =  sql_str;
13       set @bexec = exec_boolen;      
14         
15         if @bexec = 0
16         then 
17             PREPARE execsql FROM @sql1;  
18             EXECUTE execsql ; 
19         end if;
20     END IF;
21 END//
22 DELIMITER ;

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　　这个存储过程主要是校验表字段是否存在

2 判断库是否存在

1 CREATE DATABASE IF NOT EXISTS `fqmanagesysdb` /*!40100 DEFAULT CHARACTER SET utf8 */;
2 USE `fqmanagesysdb`;

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3 判断表是否存在创建

 1 CREATE TABLE IF NOT EXISTS `userinfo` (
 2   `id` int(11) NOT NULL DEFAULT '1',
 3   `user_name` varchar(255) NOT NULL,
 4   `user_pwd` varchar(255) NOT NULL,
 5   `user_type` tinyint(4) NOT NULL DEFAULT '2',
 6   `Power` int(11) NOT NULL DEFAULT '0',
 7   `DeptID` int(11) NOT NULL DEFAULT '0'
 8   PRIMARY KEY (`user_name`,`user_type`),
 9   KEY `userinfo_user_name_index` (`user_name`)
10 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;

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4 判断视图是否存在的

1 DROP VIEW IF EXISTS `allcode_view`;

5 判断存储过程是否存在

1 drop procedure if exists procedure_split;

6 插入初始化数据

1 INSERT INTO `userinfo` (id,user_name,user_pwd,user_type,Power,DeptID)  select '1', 'admin', 'admin', '1', '0', '1' from DUAL where not exists (select * from userinfo where user_name = 'admin');

7 判断触发器是否存在

1 DROP TRIGGER IF EXISTS `trigger_delete_fucode`;

8 向表里添加新的字段

1 SELECT count(*) FROM  information_schema.COLUMNS  WHERE TABLE_SCHEMA='fqmanagesysdb' AND table_name='userinfo' AND COLUMN_NAME='BrokerID' into @ret;
2 call pro_upgrade(@ret,'alter table userinfo ADD COLUMN BrokerID varchar(255) NOT NULL    ');

这里用到了上面的存储过程，mysql里面在非存储过程里面不支持if not exists的判断

9 其他

待补充……