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wuchangqian committed Sep 6, 2017
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10 changes: 5 additions & 5 deletions about-me/index.html
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<title>Me - 每个人的声音都面向世界</title>
<meta name="author" content="wuchangqian">

<meta name="description" content="Me May 7th, 2017 8:10 pm hello world !!! May 7th, 2017 8:10 pm Recent Posts Shell History 命令扩展 Windows 下ffmpeg使用 Htop是个好东西 Css-clearfix &hellip;">
<meta name="description" content="Me May 7th, 2017 8:10 pm hello world !!! May 7th, 2017 8:10 pm Recent Posts Test Shell History 命令扩展 Windows 下ffmpeg使用 Htop是个好东西 Css-clearfix &hellip;">

<meta name="HandheldFriendly" content="True">
<meta name="MobileOptimized" content="320">
Expand Down Expand Up @@ -105,6 +105,10 @@ <h1 class="entry-title">Me</h1>
<h1>Recent Posts</h1>
<ul id="recent_posts">

<li class="post">
<a href="/blog/2017/09/06/test/">Test</a>
</li>

<li class="post">
<a href="/blog/2017/08/10/shell-history/">Shell History 命令扩展</a>
</li>
Expand All @@ -121,10 +125,6 @@ <h1>Recent Posts</h1>
<a href="/blog/2014/10/19/css-clearfix/">Css-clearfix</a>
</li>

<li class="post">
<a href="/blog/2014/10/19/wangzhan-paizhao/">经营一个网站需要哪些牌照资质</a>
</li>

</ul>
</section>
<section>
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115 changes: 11 additions & 104 deletions atom.xml
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<title><![CDATA[每个人的声音都面向世界]]></title>
<link href="http://me.94313.net/atom.xml" rel="self"/>
<link href="http://me.94313.net/"/>
<updated>2017-08-10T17:47:35+08:00</updated>
<updated>2017-09-06T18:10:20+08:00</updated>
<id>http://me.94313.net/</id>
<author>
<name><![CDATA[wuchangqian]]></name>
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<generator uri="http://octopress.org/">Octopress</generator>


<entry>
<title type="html"><![CDATA[Test]]></title>
<link href="http://me.94313.net/blog/2017/09/06/test/"/>
<updated>2017-09-06T18:09:15+08:00</updated>
<id>http://me.94313.net/blog/2017/09/06/test</id>
<content type="html"><![CDATA[<p>adska</p>
]]></content>
</entry>

<entry>
<title type="html"><![CDATA[Shell History 命令扩展]]></title>
<link href="http://me.94313.net/blog/2017/08/10/shell-history/"/>
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regular expression matches the newline character, and similarly for \a, \t, and other sequences.</p>
<p>BUGS
E-mail bug reports to <a href="&#x6d;&#x61;&#x69;&#x6c;&#116;&#111;&#58;&#98;&#x75;&#103;&#x2d;&#x73;&#101;&#100;&#x40;&#103;&#x6e;&#117;&#x2e;&#x6f;&#114;&#103;&#46;">&#98;&#x75;&#x67;&#45;&#x73;&#101;&#100;&#64;&#103;&#110;&#117;&#46;&#x6f;&#114;&#103;&#x2e;</a> Also, please include the output of &ldquo;sed &ndash;version&rdquo; in the body of your
E-mail bug reports to <a href="&#109;&#x61;&#105;&#x6c;&#116;&#x6f;&#58;&#98;&#117;&#103;&#x2d;&#115;&#101;&#x64;&#64;&#x67;&#110;&#117;&#46;&#111;&#114;&#103;&#x2e;">&#98;&#117;&#x67;&#45;&#x73;&#101;&#100;&#64;&#x67;&#x6e;&#x75;&#46;&#111;&#x72;&#103;&#x2e;</a> Also, please include the output of &ldquo;sed &ndash;version&rdquo; in the body of your
report if at all possible.</p>
<p>AUTHOR
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OR
# yum update httpd -y &ndash;downloadonly &ndash;downloaddir=/opt ##下载到指定目录
# yum install perl-MailTools &ndash;downloadonly &ndash;downloaddir=/opt -y ##如果软件已经下载过了，必须使用这个来下载</p>
]]></content>
</entry>

<entry>
<title type="html"><![CDATA[理解Mysql字符集设置]]></title>
<link href="http://me.94313.net/blog/2012/01/17/understand-mysql-charset/"/>
<updated>2012-01-17T10:39:27+08:00</updated>
<id>http://me.94313.net/blog/2012/01/17/understand-mysql-charset</id>
<content type="html"><![CDATA[<h3>基本概念</h3>
<ul>
<li>字符(Character)是指人类语言中最小的表义符号。例如’A’、’B’等；</li>
<li>给定一系列字符，对每个字符赋予一个数值，用数值来代表对应的字符，这一数值就是字符的编码(Encoding)例如，我们给字符’A’赋予数值0，给字符’B’赋予数值1，则0就是字符’A’的编码；</li>
<li>给定一系列字符并赋予对应的编码后，所有这些字符和编码对组成的集合就是字符集(Character Set)。例如，给定字符列表为{’A’,’B’}时，{’A’=>0, ‘B’=>1}就是一个字符集；</li>
<li>字符序(Collation)是指在同一字符集内字符之间的比较规则；</li>
<li>确定字符序后，才能在一个字符集上定义什么是等价的字符，以及字符之间的大小关系；</li>
<li>每个字符序唯一对应一种字符集，但一个字符集可以对应多种字符序，其中有一个是默认字符序(Default Collation)；</li>
<li>MySQL中的字符序名称遵从命名惯例：以字符序对应的字符集名称开头；以<em>ci(表示大小写不敏感)、</em>cs(表示大小写敏感)或_bin(表示按编码值比较)结尾。例如：在字符序“utf8_general_ci”下，字符“a”和“A”是等价的；</li>
</ul>
<h3>MySQL字符集设置</h3>
<p>• 系统变量：
– character_set_server：默认的内部操作字符集
– character_set_client：客户端来源数据使用的字符集
– character_set_connection：连接层字符集
– character_set_results：查询结果字符集
– character_set_database：当前选中数据库的默认字符集
– character_set_system：系统元数据(字段名等)字符集
– 还有以collation<em>开头的同上面对应的变量，用来描述字符序。
• 用introducer指定文本字符串的字符集：
– 格式为：[</em>charset] ’string’ [COLLATE collation]
– 例如：
• SELECT <em>latin1 ’string’;
• SELECT </em>utf8 ‘你好’ COLLATE utf8_general_ci;
– 由introducer修饰的文本字符串在请求过程中不经过多余的转码，直接转换为内部字符集处理。</p>
<h3>MySQL中的字符集转换过程</h3>
<pre><code>1. MySQL Server收到请求时将请求数据从character_set_client转换为character_set_connection；
2. 进行内部操作前将请求数据从character_set_connection转换为内部操作字符集，其确定方法如下：
• 使用每个数据字段的CHARACTER SET设定值；
• 若上述值不存在，则使用对应数据表的DEFAULT CHARACTER SET设定值(MySQL扩展，非SQL标准)；
• 若上述值不存在，则使用对应数据库的DEFAULT CHARACTER SET设定值；
• 若上述值不存在，则使用character_set_server设定值。
3. 将操作结果从内部操作字符集转换为character_set_results。
</code></pre>
<p><img src="http://me.94313.net/images/understand-mysql-charset-01.jpg" alt="understand-mysql-charset" /></p>
<h3>常见问题解析</h3>
<ul>
<li>向默认字符集为utf8的数据表插入utf8编码的数据前没有设置连接字符集，查询时设置连接字符集为utf8</li>
<li>插入时根据MySQL服务器的默认设置，character_set_client、character_set_connection和character_set_results均为latin1；</li>
<li>插入操作的数据将经过latin1=>latin1=>utf8的字符集转换过程，这一过程中每个插入的汉字都会从原始的3个字节变成6个字节保存；</li>
<li>查询时的结果将经过utf8=>utf8的字符集转换过程，将保存的6个字节原封不动返回，产生乱码……</li>
</ul>
<p><img src="http://me.94313.net/images/understand-mysql-charset-02.jpg" alt="understand-mysql-charset" /></p>
<ul>
<li>向默认字符集为latin1的数据表插入utf8编码的数据前设置了连接字符集为utf8</li>
<li>插入时根据连接字符集设置，character_set_client、character_set_connection和character_set_results均为utf8；</li>
<li>插入数据将经过utf8=>utf8=>latin1的字符集转换，若原始数据中含有\u0000~\u00ff范围以外的Unicode字 符，会因为无法在latin1字符集中表示而被转换为“?”(0×3F)符号，以后查询时不管连接字符集设置如何都无法恢复其内容了。</li>
</ul>
<p><img src="http://me.94313.net/images/understand-mysql-charset-02.jpg" alt="understand-mysql-charset" /></p>
<h3>检测字符集问题的一些手段</h3>
<ul>
<li>SHOW CHARACTER SET;</li>
<li>SHOW COLLATION;</li>
<li>SHOW VARIABLES LIKE ‘character%’;</li>
<li>SHOW VARIABLES LIKE ‘collation%’;</li>
<li>SQL函数HEX、LENGTH、CHAR_LENGTH</li>
<li>SQL函数CHARSET、COLLATION</li>
</ul>
<h3>使用MySQL字符集时的建议</h3>
<ul>
<li>建立数据库/表和进行数据库操作时尽量显式指出使用的字符集，而不是依赖于MySQL的默认设置，否则MySQL升级时可能带来很大困扰；</li>
<li>数据库和连接字符集都使用latin1时虽然大部分情况下都可以解决乱码问题，但缺点是无法以字符为单位来进行SQL操作，一般情况下将数据库和连接字符集都置为utf8是较好的选择；</li>
<li>使用mysql C API时，初始化数据库句柄后马上用mysql_options设定MYSQL_SET_CHARSET_NAME属性为utf8，这样就不用显式地用 SET NAMES语句指定连接字符集，且用mysql_ping重连断开的长连接时也会把连接字符集重置为utf8；</li>
<li>对于mysql PHP API，一般页面级的PHP程序总运行时间较短，在连接到数据库以后显式用SET NAMES语句设置一次连接字符集即可；但当使用长连接时，请注意保持连接通畅并在断开重连后用SET NAMES语句显式重置连接字符集。</li>
</ul>
<h3>其他注意事项</h3>
<ul>
<li>my.cnf中的default_character_set设置只影响mysql命令连接服务器时的连接字符集，不会对使用libmysqlclient库的应用程序产生任何作用！</li>
<li>对字段进行的SQL函数操作通常都是以内部操作字符集进行的，不受连接字符集设置的影响。</li>
<li>SQL语句中的裸字符串会受到连接字符集或introducer设置的影响，对于比较之类的操作可能产生完全不同的结果，需要小心！</li>
</ul>
]]></content>
</entry>

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Expand Up @@ -223,6 +223,10 @@ <h3>其他注意事项</h3>
<h1>Recent Posts</h1>
<ul id="recent_posts">

<li class="post">
<a href="/blog/2017/09/06/test/">Test</a>
</li>

<li class="post">
<a href="/blog/2017/08/10/shell-history/">Shell History 命令扩展</a>
</li>
Expand All @@ -239,10 +243,6 @@ <h1>Recent Posts</h1>
<a href="/blog/2014/10/19/css-clearfix/">Css-clearfix</a>
</li>

<li class="post">
<a href="/blog/2014/10/19/wangzhan-paizhao/">经营一个网站需要哪些牌照资质</a>
</li>

</ul>
</section>
<section>
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8 changes: 4 additions & 4 deletions blog/2012/03/02/note-of-yum/index.html
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Expand Up @@ -339,6 +339,10 @@ <h3>附：</h3>
<h1>Recent Posts</h1>
<ul id="recent_posts">

<li class="post">
<a href="/blog/2017/09/06/test/">Test</a>
</li>

<li class="post">
<a href="/blog/2017/08/10/shell-history/">Shell History 命令扩展</a>
</li>
Expand All @@ -355,10 +359,6 @@ <h1>Recent Posts</h1>
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</li>

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</li>

</ul>
</section>
<section>
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8 changes: 4 additions & 4 deletions blog/2012/03/23/command-line-skill-of-linux/index.html
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Expand Up @@ -198,6 +198,10 @@ <h2>注意：</h2>
<h1>Recent Posts</h1>
<ul id="recent_posts">

<li class="post">
<a href="/blog/2017/09/06/test/">Test</a>
</li>

<li class="post">
<a href="/blog/2017/08/10/shell-history/">Shell History 命令扩展</a>
</li>
Expand All @@ -214,10 +218,6 @@ <h1>Recent Posts</h1>
<a href="/blog/2014/10/19/css-clearfix/">Css-clearfix</a>
</li>

<li class="post">
<a href="/blog/2014/10/19/wangzhan-paizhao/">经营一个网站需要哪些牌照资质</a>
</li>

</ul>
</section>
<section>
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8 changes: 4 additions & 4 deletions blog/2012/05/30/intr-rsa/index.html
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Expand Up @@ -158,6 +158,10 @@ <h1 class="entry-title">RSA加密算法简单介绍</h1>
<h1>Recent Posts</h1>
<ul id="recent_posts">

<li class="post">
<a href="/blog/2017/09/06/test/">Test</a>
</li>

<li class="post">
<a href="/blog/2017/08/10/shell-history/">Shell History 命令扩展</a>
</li>
Expand All @@ -174,10 +178,6 @@ <h1>Recent Posts</h1>
<a href="/blog/2014/10/19/css-clearfix/">Css-clearfix</a>
</li>

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<a href="/blog/2014/10/19/wangzhan-paizhao/">经营一个网站需要哪些牌照资质</a>
</li>

</ul>
</section>
<section>
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8 changes: 4 additions & 4 deletions blog/2012/10/19/it-gangwei-shuoming/index.html
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Expand Up @@ -342,6 +342,10 @@ <h3>岗位：产品经理（当所开发的项目为产品型项目时设立，
<h1>Recent Posts</h1>
<ul id="recent_posts">

<li class="post">
<a href="/blog/2017/09/06/test/">Test</a>
</li>

<li class="post">
<a href="/blog/2017/08/10/shell-history/">Shell History 命令扩展</a>
</li>
Expand All @@ -358,10 +362,6 @@ <h1>Recent Posts</h1>
<a href="/blog/2014/10/19/css-clearfix/">Css-clearfix</a>
</li>

<li class="post">
<a href="/blog/2014/10/19/wangzhan-paizhao/">经营一个网站需要哪些牌照资质</a>
</li>

</ul>
</section>
<section>
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8 changes: 4 additions & 4 deletions blog/2012/12/06/use-of-stack/index.html
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Expand Up @@ -696,6 +696,10 @@ <h1 class="entry-title">使用栈来找路径</h1>
<h1>Recent Posts</h1>
<ul id="recent_posts">

<li class="post">
<a href="/blog/2017/09/06/test/">Test</a>
</li>

<li class="post">
<a href="/blog/2017/08/10/shell-history/">Shell History 命令扩展</a>
</li>
Expand All @@ -712,10 +716,6 @@ <h1>Recent Posts</h1>
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</li>

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<a href="/blog/2014/10/19/wangzhan-paizhao/">经营一个网站需要哪些牌照资质</a>
</li>

</ul>
</section>
<section>
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8 changes: 4 additions & 4 deletions blog/2013/08/30/jquery-extend-method/index.html
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Expand Up @@ -229,6 +229,10 @@ <h1 class="entry-title">jQuery.extend()函数注释说明</h1>
<h1>Recent Posts</h1>
<ul id="recent_posts">

<li class="post">
<a href="/blog/2017/09/06/test/">Test</a>
</li>

<li class="post">
<a href="/blog/2017/08/10/shell-history/">Shell History 命令扩展</a>
</li>
Expand All @@ -245,10 +249,6 @@ <h1>Recent Posts</h1>
<a href="/blog/2014/10/19/css-clearfix/">Css-clearfix</a>
</li>

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<a href="/blog/2014/10/19/wangzhan-paizhao/">经营一个网站需要哪些牌照资质</a>
</li>

</ul>
</section>
<section>
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8 changes: 4 additions & 4 deletions blog/2014/01/31/consistent-hashing/index.html
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Expand Up @@ -186,6 +186,10 @@ <h1 class="entry-title">一致性哈希算法浅析</h1>
<h1>Recent Posts</h1>
<ul id="recent_posts">

<li class="post">
<a href="/blog/2017/09/06/test/">Test</a>
</li>

<li class="post">
<a href="/blog/2017/08/10/shell-history/">Shell History 命令扩展</a>
</li>
Expand All @@ -202,10 +206,6 @@ <h1>Recent Posts</h1>
<a href="/blog/2014/10/19/css-clearfix/">Css-clearfix</a>
</li>

<li class="post">
<a href="/blog/2014/10/19/wangzhan-paizhao/">经营一个网站需要哪些牌照资质</a>
</li>

</ul>
</section>
<section>
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8 changes: 4 additions & 4 deletions blog/2014/05/20/octopress-add-category2rightaside/index.html
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Expand Up @@ -170,6 +170,10 @@ <h2>配置侧边栏需要修改_config.yml文件，修改其default_asides项：
<h1>Recent Posts</h1>
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</li>

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</li>
Expand All @@ -186,10 +190,6 @@ <h1>Recent Posts</h1>
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</ul>
</section>
<section>
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8 changes: 4 additions & 4 deletions blog/2014/08/31/apache-http-request-process/index.html
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Expand Up @@ -147,6 +147,10 @@ <h1 class="entry-title">Apache处理http请求的生命周期</h1>
<h1>Recent Posts</h1>
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<a href="/blog/2017/09/06/test/">Test</a>
</li>

<li class="post">
<a href="/blog/2017/08/10/shell-history/">Shell History 命令扩展</a>
</li>
Expand All @@ -163,10 +167,6 @@ <h1>Recent Posts</h1>
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</li>

</ul>
</section>
<section>
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