mysql 下数据库升级脚本的编写

1 升级时必须得存储过程

 /**/
 drop procedure if exists pro_upgrade;
 DELIMITER //
 CREATE DEFINER=`root`@`%` PROCEDURE  `pro_upgrade`(
   exec_boolen    int   ,
   sql_str             VARCHAR(256)
 )
 BEGIN
     # 执行sql 操作
     IF sql_str <>''
     THEN
       set @sql1 =  sql_str;
       set @bexec = exec_boolen;      

         if @bexec = 0
         then
             PREPARE execsql FROM @sql1;
             EXECUTE execsql ;
         end if;
     END IF;
 END//
 DELIMITER ;

　　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

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

3 判断表是否存在创建

 CREATE TABLE IF NOT EXISTS `userinfo` (
   `id` int(11) NOT NULL DEFAULT '',
   `user_name` varchar(255) NOT NULL,
   `user_pwd` varchar(255) NOT NULL,
   `user_type` tinyint(4) NOT NULL DEFAULT '',
   `Power` int(11) NOT NULL DEFAULT '',
   `DeptID` int(11) NOT NULL DEFAULT ''
   PRIMARY KEY (`user_name`,`user_type`),
   KEY `userinfo_user_name_index` (`user_name`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;

4 判断视图是否存在的

DROP VIEW IF EXISTS `allcode_view`;

5 判断存储过程是否存在

drop procedure if exists procedure_split;

6 插入初始化数据

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

7 判断触发器是否存在

DROP TRIGGER IF EXISTS `trigger_delete_fucode`;

8 向表里添加新的字段

 SELECT count(*) FROM  information_schema.COLUMNS  WHERE TABLE_SCHEMA='fqmanagesysdb' AND table_name='userinfo' AND COLUMN_NAME='BrokerID' into @ret;
 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……