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如何用MySQL 命令来实现账户管理

Jun 07, 2016 pm 04:14 PM
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今天我们要学习的是如何用MySQL 命令的方式来对账号进行管理,我们大家都知道在实际应用中MySQL 命令可以完成多种任务,以下的文章主要是对用MySQL 命令的方式来对账号进行管理的具体内容介绍。 手册上说 GRANT语句允许系统管理员创建MySQL用户账户,授予权

今天我们要学习的是如何用MySQL 命令的方式来对账号进行管理,我们大家都知道在实际应用中MySQL 命令可以完成多种任务,以下的文章主要是对用MySQL 命令的方式来对账号进行管理的具体内容介绍。

手册上说 “GRANT语句允许系统管理员创建MySQL用户账户,授予权限。”。但我无论怎么样也没有办法用这个命令创建用户账号。

我想增加一个新的测试用户,命令如下:

<ol class="dp-xml">
<li class="alt">MySQL<span><span class="tag">></span><span> GRANT ALL ON qyoa.* TO chy@localhost INDENTIFIED BY "123456";   </span></span>
</li>
<li><span>ERROR 1046 (3D000): No database selected </span></li>
</ol>

后来上网找资料才发现这样写是错的,改成:

<ol class="dp-xml">
<li class="alt">MySQL<span><span class="tag">></span><span> GRANT ALL ON qyoa.* TO chy@localhost INDENTIFIED BY "123456";   </span></span>
</li>
<li><span>ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to   </span></li>
<li class="alt">
<span>your </span>MySQL<span> server version for the right syntax to use near 'INDEN TIFIED BY "123456"' at line 1 </span>
</li>
</ol>

网上有人也遇到这样的错误,有人如些回答:MySQL.user MySQL命令库应该选上.因为你执行的操作是修改权限表... 这个明白了你就可以直接操作这个表了.呵呵
(http://www.phpchina.com/html/54/t-51354.html)

可能是本人愚钝,怎么也看不明白这话什么意思。

只好一遍又一遍的试

<ol class="dp-xml">
<li class="alt">MySQL<span class="tag">></span> use MySQL;   </li>
<li>MySQL<span class="tag">></span><span> GRANT ALL ON qyoa.* TO chy@localhost INDENTIFIED BY "123456";  </span>
</li>
</ol>

错误提示同上面一样。


后来折腾了一两个小时,实现找不到问题出在那里。只好换过一种实现方式,

<ol class="dp-xml">
<li class="alt">MySQL<span><span class="tag">></span><span> CREATE USER chy@localhost IDENTIFIED BY '123456';  </span></span>
</li>
<li>MySQL<span class="tag">></span><span> grant all on qyoa.* to chy@localhost; </span>
</li>
</ol>

终于建好用户和分配好权限。难道只可以创建好账号才可以分配权限?

后来的我猜测得到证实,真的是要创建好账号才可以分配权限。杯具啊!就这样白白浪费了我好几个小时。

<ol class="dp-xml"><li class="alt">MySQL<span><span class="tag">></span><span> GRANT ALL ON qyoa.* TO chy@localhost INDENTIFIED BY "123456";  </span></span>
</li></ol>

运行成功!

如果没有创建用户帐号,直接执行

<ol class="dp-xml"><li class="alt">MySQL<span><span class="tag">></span><span> grant all on qyoa.* to chy@localhost; </span></span>
</li></ol>

会用如下错误信息

<ol class="dp-xml"><li class="alt"><span><span>ERROR 1133(42000) can 't find any matching row in the user table </span></span></li></ol>

或许是我本机的设置有问题吧,今天再执行
 

<ol class="dp-xml"><li class="alt">MySQL<span><span class="tag">></span><span>GRANT ALL ON qyoa.* TO chy1@localhost identified by "123456"; </span></span>
</li></ol>

又可以正常执行了,搞不懂什么原因。难不成真的是我人品问题?

但将语句改成如下执行又出现问题:

<ol class="dp-xml">
<li class="alt">MySQL<span><span class="tag">></span><span> grant all on qyoa.* to chy@localhost;  </span></span>
</li>
<li><span>ERROR 1133(42000) can 't find any matching row in the user table  </span></li>
</ol>

翻查MySQL命令手册得到如下资料:

”SQL服务器模式
模式定义MySQL应支持哪些SQL语法,以及应执行哪种数据验证检查。你可以用SELECT @@sql_mode语句查询当前的模式。

<ol class="dp-xml"><li class="alt"><span><span>· NO_AUTO_CREATE_USER </span></span></li></ol>

防止GRANT自动创建新用户,除非还指定了密码。

你还可以在启动后用SET [SESSION|GLOBAL] sql_mode='modes'语句设置sql_mode变量来更改SQL模式。

设置 GLOBAL变量时需要拥有SUPER权限,并且会影响从那时起连接的所有客户端的操作。设置SESSION变量只影响当前的客户端。

任何客户端可以随时更改自己的会话 sql_mode值。“

原来是设定了 sql 服务器模式。 sql_mode值 是保存在 my.ini 中,可以直接打开该文件修改后再重启服务,也可以用


SET SESSION sql_mode='STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION' 进行更改。

测试:

<ol class="dp-xml"><li class="alt">MySQL<span><span class="tag">></span><span>SET SESSION </span><span class="attribute">sql_mode</span><span>=</span><span class="attribute-value">'STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION'</span><span>;  </span></span>
</li></ol>

后再执行

<ol class="dp-xml"><li class="alt">MySQL<span><span class="tag">></span><span> grant all on qyoa.* to chy@localhost; </span></span>
</li></ol>

创建空密码新账号成功!以上的相关内容就是对MySQL 账户管理 今天学习怎样用 MySQL 命令的方式来管理账号的介绍,望你能有所收获。


 


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