因mysql 8.0新制定的语句表名限制条件被dede自带的后台用户登录检查语句指定表别名所违背而引起的bug。如何解决呢？
找到dedecms的文件目录, 在include子目录下找到userloginlass.php, 249行左右看到如下语句:
<span style="fontfamily:taha,geneva,sansserif;"><span style="fontsize:14px;">1
//只允许用户名和密码用09,az,AZ,'@','_','.',''这些字符
2
$this>userName = preg_replace("/[^09azAZ_@!\.]/", '', $username);
3
$this>userPwd = preg_replace("/[^09azAZ_@!\.]/", '', $userpwd);
4
$pwd = substr(md5($this>userPwd), 5, 20);
5
6
$dsql>SetQuery("SELECT admin.*,atype.purviews FR `dede_admin` admin LEFT JOIN `dede_admintype` atype ON atype.rank=admin.usertype WHERE admin.userid LIKE '".$this>userName."' LIMIT 0,1");
7
$dsql>Execute();
8
$row = $dsql>GetObject();
</span></span>
其中SetQuery就是设定将要执行的sql语句, 下一行Execute()来执行这个设定好语句，我们从语句里面改。改成如下：
<span style="fontfamily:taha,geneva,sansserif;"><span style="fontsize:14px;">1
//只允许用户名和密码用09,az,AZ,'@','_','.',''这些字符
2
$this>userName = preg_replace("/[^09azAZ_@!\.]/", '', $username);
3
$this>userPwd = preg_replace("/[^09azAZ_@!\.]/", '', $userpwd);
4
$pwd = substr(md5($this>userPwd), 5, 20);
5
6
$dsql>SetQuery("SELECT admi.*,atype.purviews FR `dede_admin` admi LEFT JOIN `dede_admintype` atype ON atype.rank=admi.usertype WHERE admi.userid LIKE '".$this>userName."' LIMIT 0,1");
7
$dsql>Execute();
8
$row = $dsql>GetObject();
</span></span>
<span style="fontfamily:taha,geneva,sansserif;"><span style="fontsize:14px;">1
//只允许用户名和密码用09,az,AZ,'@','_','.',''这些字符
2
$this>userName = preg_replace("/[^09azAZ_@!\.]/", '', $username);
3
$this>userPwd = preg_replace("/[^09azAZ_@!\.]/", '', $userpwd);
4
$pwd = substr(md5($this>userPwd), 5, 20);
5
6
$dsql>SetQuery("SELECT admi.*,atype.purviews FR `dede_admin` admi LEFT JOIN `dede_admintype` atype ON atype.rank=admi.usertype WHERE admi.userid LIKE '".$this>userName."' LIMIT 0,1");
7
$dsql>Execute();
8
$row = $dsql>GetObject();
</span></span>
这样一来，表的别名从admin删去一个n被改成admi, 就可以正常登录后台了。
上一篇：织梦cms内容页自动内链在PHP5.5以上版本不能用
下一篇：dedecms 模板文件不存在，无法解析文档＂的终极各种解决办法
