PHP 5 连接 mysql 5的认证协议问题
<P><FONT color=#f70909>来源：LinuxAid</FONT> </P><P>MYSQL 4.1以后, 采用了一种新的用户认证<a href="http://hackbase.com/network/protocol" target="_blank" >协议</A>, 对于老的客户端会出现不支持认证<a href="http://hackbase.com/network/protocol" target="_blank" >协议</A>的错误, 以下是官方网站的解决方法 r </P>
<P> １Upgrade all client programs to use a 4.1.1 or newer client library. </P>
<P> 更新客户端库，这需要更新ＰＨＰ的扩展库，对于老的ａｐｉ ＰＨＰ已经不提供了这样的扩展库了 </P>
<P> ２When connecting to the server with a pre-4.1 client program, use an account that still has a pre-4.1-style password. </P>
<P> 使用以前建立的账号连接，对于在新的认证<a href="http://hackbase.com/network/protocol" target="_blank" >协议</A>下建立的<a href="http://hackbase.com/skill" target="_blank" >账户</A>就不行了 </P>
<P> ３Reset the password to pre-4.1 style for each user that needs to use a pre-4.1 client program. This can be done using the SET PASSWORD statement and the OLD<a href="http://www1.hackbase.com/network/server/200501209617.htm#" target="_blank" >_</A>PASSWORD() function: my<a href="http://hackbase.com/hacker" target="_blank" >sql</A>> SET PASSWORD FOR </P>
<P> -> <a href=" target="_blank" >_</A>user'@'some<a href="http://www1.hackbase.com/network/server/200501209617.htm#" target="_blank" >_</A>host'">'some<a href="http://www1.hackbase.com/network/server/200501209617.htm#" target="_blank" >_</A>user'@'some<a href="http://www1.hackbase.com/network/server/200501209617.htm#" target="_blank" >_</A>host'</A> = OLD<a href="http://www1.hackbase.com/network/server/200501209617.htm#" target="_blank" >_</A>PASSWORD('newpwd'); </P>
<P> Alternatively, use UPDATE and FLUSH PRIVILEGES: my<a href="http://hackbase.com/hacker" target="_blank" >sql</A>> UPDATE my<a href="http://hackbase.com/hacker" target="_blank" >sql</A>.user SET Password = OLD<a href="http://www1.hackbase.com/network/server/200501209617.htm#" target="_blank" >_</A>PASSWORD('newpwd') -> WHERE Host = 'some<a href="http://www1.hackbase.com/network/server/200501209617.htm#" target="_blank" >_</A>host' AND User = 'some<a href="http://www1.hackbase.com/network/server/200501209617.htm#" target="_blank" >_</A>user'; </P>
<P> my<a href="http://hackbase.com/hacker" target="_blank" >sql</A>> FLUSH PRIVILEGES; </P>
<P> Substitute the password you want to use for ``newpwd'' in the preceding examples. MySQL cannot tell you what the original password was, so you'll need to pick a new one. </P>
<P> 这是一个不错的办法，新建立的账号采用老式的加密<a href="http://hackbase.com/network/protocol" target="_blank" >协议</A> </P>
<P> ４Tell the server to use the older password hashing algorithm: </P>
<P> Start my<a href="http://hackbase.com/hacker" target="_blank" >sql</A>d with the --old-passwords option. </P>
<P> 这样新认证<a href="http://hackbase.com/network/protocol" target="_blank" >协议</A>的优点就没法使用了 </P>
<P> ５Assign an old-format password to each account that has had its password updated to the longer 4.1 format. You can identify these accounts with the following query: my<a href="http://hackbase.com/hacker" target="_blank" >sql</A>> SELECT Host, User, Password FROM my<a href="http://hackbase.com/hacker" target="_blank" >sql</A>.user </P>
<P> -> WHERE LENGTH(Password) > 16; </P>
<P> For each account record displayed by the query, use the Host and User values and assign a password using the OLD<a href="http://www1.hackbase.com/network/server/200501209617.htm#" target="_blank" >_</A>PASSWORD() function and either SET PASSWORD or UPDATE, as described earlier. </P>
<P> 恢复已经升级了口令到老样式 </P>
<P> 本文参照了 <a href="http://dev.my<a%20href=/" target="_blank" >sql</A>.com/doc/my<a href="http://hackbase.com/hacker" target="_blank" >sql</A>/en/Old<a href="http://www1.hackbase.com/network/server/200501209617.htm#" target="_blank" >_</A>client.html">http://dev.my<a href="http://hackbase.com/hacker" target="_blank" >sql</A>.com/doc/my<a href="http://hackbase.com/hacker" target="_blank" >sql</A>/en/Old<a href="http://www1.hackbase.com/network/server/200501209617.htm#" target="_blank" >_</A>client.html</A> </P>
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