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<?xml version="1.0" encoding="utf-8"?>
<search>
<entry>
<title>Hexo Quick Start</title>
<url>/other/hexo_quick_start.html</url>
<content><![CDATA[<p>Welcome to <a href="https://hexo.io/" target="_blank" rel="noopener">Hexo</a>! This is your very first post. Check <a href="https://hexo.io/docs/" target="_blank" rel="noopener">documentation</a> for more info. If you get any problems when using Hexo, you can find the answer in <a href="https://hexo.io/docs/troubleshooting.html" target="_blank" rel="noopener">troubleshooting</a> or you can ask me on <a href="https://github.com/hexojs/hexo/issues" target="_blank" rel="noopener">GitHub</a>.</p>
<h2 id="Quick-Start"><a href="#Quick-Start" class="headerlink" title="Quick Start"></a>Quick Start</h2><h3 id="Create-a-new-post"><a href="#Create-a-new-post" class="headerlink" title="Create a new post"></a>Create a new post</h3><figure class="highlight bash"><table><tr><td class="code"><pre><span class="line">$ hexo new <span class="string">"My New Post"</span></span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/writing.html" target="_blank" rel="noopener">Writing</a></p>
<a id="more"></a>
<h3 id="Run-server"><a href="#Run-server" class="headerlink" title="Run server"></a>Run server</h3><figure class="highlight bash"><table><tr><td class="code"><pre><span class="line">$ hexo server</span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/server.html" target="_blank" rel="noopener">Server</a></p>
<h3 id="Generate-static-files"><a href="#Generate-static-files" class="headerlink" title="Generate static files"></a>Generate static files</h3><figure class="highlight bash"><table><tr><td class="code"><pre><span class="line">$ hexo generate</span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/generating.html" target="_blank" rel="noopener">Generating</a></p>
<h3 id="Deploy-to-remote-sites"><a href="#Deploy-to-remote-sites" class="headerlink" title="Deploy to remote sites"></a>Deploy to remote sites</h3><figure class="highlight bash"><table><tr><td class="code"><pre><span class="line">$ hexo deploy</span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/deployment.html" target="_blank" rel="noopener">Deployment</a></p>
]]></content>
<categories>
<category>other</category>
</categories>
</entry>
<entry>
<title>Java 程序员学习教程汇总</title>
<url>/java/java_knowledge.html</url>
<content><![CDATA[<h1 id="Java"><a href="#Java" class="headerlink" title="Java"></a>Java</h1><ul>
<li><a href="https://dongchuan.gitbooks.io/gradle-user-guide-/" target="_blank" rel="noopener">Gradle 用户指南官方文档中文版 – DONGChuan</a></li>
</ul>
<h1 id="DB"><a href="#DB" class="headerlink" title="DB"></a>DB</h1><ul>
<li><a href="http://teddymaef.github.io/learncassandra/cn/about/about_cassandra.html" target="_blank" rel="noopener">Cassandra 学习 – Teddy</a><a id="more"></a>
</li>
</ul>
]]></content>
<categories>
<category>java</category>
</categories>
<tags>
<tag>java</tag>
</tags>
</entry>
<entry>
<title>SQL Server 与 MySQL 在SQL方面的差异</title>
<url>/db/mysql_sqlserver_diff.html</url>
<content><![CDATA[<h2 id="SQL-Server-与-MySQL-在SQL方面的差异"><a href="#SQL-Server-与-MySQL-在SQL方面的差异" class="headerlink" title="SQL Server 与 MySQL 在SQL方面的差异"></a>SQL Server 与 MySQL 在SQL方面的差异</h2><p>SQL Server在时间类型上支持默认值 getDate()<br>MySQL 5.5 在DateTime 不支持默认值，MySQL在 5.6之后的版本支持该功能，现在用触发器替代。</p>
<a id="more"></a>
<p>1. 自动变量使用的关键字不相同</p>
<p>mysql 使用关键字(keyword) <code>AUTO_INCREMENT</code> 表示变量自增，初始值为1，每次自增1，可以通过<code>ALTER TABLE Persons AUTO_INCREMENT=100</code> 修改初始值。</p>
<figure class="highlight sql"><table><tr><td class="code"><pre><span class="line"><span class="keyword">CREATE</span> <span class="keyword">TABLE</span> Persons (</span><br><span class="line"> <span class="keyword">ID</span> <span class="built_in">int</span> <span class="keyword">NOT</span> <span class="literal">NULL</span> AUTO_INCREMENT,</span><br><span class="line"> LastName <span class="built_in">varchar</span>(<span class="number">255</span>) <span class="keyword">NOT</span> <span class="literal">NULL</span>,</span><br><span class="line"> FirstName <span class="built_in">varchar</span>(<span class="number">255</span>),</span><br><span class="line"> Address <span class="built_in">varchar</span>(<span class="number">255</span>),</span><br><span class="line"> City <span class="built_in">varchar</span>(<span class="number">255</span>),</span><br><span class="line"> PRIMARY <span class="keyword">KEY</span> (<span class="keyword">ID</span>)</span><br><span class="line">)</span><br></pre></td></tr></table></figure>
<p>sql server 使用关键字 <code>IDENTITY</code> 表示变量自增，<code>IDENTITY(1,1)</code> 第一个参数表示自增变量的初始值，第二个变量表示每次加的值，这里为1</p>
<figure class="highlight sql"><table><tr><td class="code"><pre><span class="line"><span class="keyword">CREATE</span> <span class="keyword">TABLE</span> Persons (</span><br><span class="line"> <span class="keyword">ID</span> <span class="built_in">int</span> <span class="keyword">IDENTITY</span>(<span class="number">1</span>,<span class="number">1</span>) PRIMARY <span class="keyword">KEY</span>,</span><br><span class="line"> LastName <span class="built_in">varchar</span>(<span class="number">255</span>) <span class="keyword">NOT</span> <span class="literal">NULL</span>,</span><br><span class="line"> FirstName <span class="built_in">varchar</span>(<span class="number">255</span>),</span><br><span class="line"> Address <span class="built_in">varchar</span>(<span class="number">255</span>),</span><br><span class="line"> City <span class="built_in">varchar</span>(<span class="number">255</span>)</span><br><span class="line">)</span><br></pre></td></tr></table></figure>
<p>2. 获取当前时间函数</p>
<ul>
<li>SQLServer 使用：<code>getdate()</code></li>
<li>MySQL 使用：<code>now()</code></li>
</ul>
<p>3. 从数据库定位到表(schema)</p>
<p>Sqlserver写法：<strong>库名.schema.表名 ；或者：库名..表名</strong> （注：中间使用两个点)，默认的schema为 <code>dbo</code></p>
<pre><code>select password from Info.dbo.users where userName='boss'
</code></pre><p>或者</p>
<pre><code>select password from Info..users where userName='boss'
</code></pre><p>mysql写法：<strong>库名.表名</strong> mysql 把schema当做一个数据库</p>
<pre><code>select password from Info.users where userName='boss'
</code></pre><p>4. 判断是否存在某个数据库，若存在，则删除</p>
<p>Sqlserver写法：</p>
<pre><code>IF DB_ID('users') IS NOT NULL
DROP DATABASE users
</code></pre><p>Mysql写法：</p>
<pre><code>Drop DATABASEif exists users
</code></pre><p>拓展：若sqlserver数据库正在使用中，删除之前，先要把数据库变成“单一用户”，再删除</p>
<pre><code>ALTER DATABASE users SET SINGLE_USER with ROLLBACK IMMEDIATE IF DB_ID('users') IS NOT NULL DROP DATABASE users
</code></pre><p>另附：判断某数据库中是否存在某张表，若存在，则删除</p>
<p>Sqlserver写法：</p>
<pre><code>if exists(select * from sysobjects where name ='Users_test')
drop table Users_test
</code></pre><p>Mysql写法：</p>
<pre><code>DROP TABLE IF EXISTS Users_test
</code></pre><p>5. 主键存在，则更新，不存在，则插入</p>
<p>Mysql写法: </p>
<pre><code>INSERT into users (userID,userName,password) VALUES (1,’jmj’,’123’) ON DUPLICATE KEY UPDATE userName ='jmj', password =123
</code></pre><p>SqlServer没有mysql这样的关键字，只能组合sql语句来实现操作:</p>
<pre><code>if not exists (select userID from users where userID= 1)insert into users (userID,userName,password) values(1,’jmj’,’123’) else update users set userName = ’jmj’, password=’123’ where userID = 1
</code></pre><p>6. 符号的使用</p>
<p>mysql对参数可以使用单引号，也可以使用双引号，对字段名和表名可以使用反引号。</p>
<p>sqlserver只能使用单引号，且不能使用反引号，如果字段是关键字的话，需要使用中括号。</p>
<ul>
<li>Mysql写法： </li>
</ul>
<pre><code>Select `password` from Users where userName='boss' or username=”jmj”
</code></pre><ul>
<li>Sqlserver写法:</li>
</ul>
<pre><code>Select password from Users where userName='boss' or username=’jmj’
</code></pre><p>7. 取出查询结果中的第一条数据或者前几条记录（取前几条记录只需要修改对应的数字即可)，使用的关键字不同</p>
<p>SQLServer写法(<code>top</code>)：</p>
<pre><code>select top 1 password from users where userName='boss'
</code></pre><p>MySQL写法(<code>limit</code>)：</p>
<pre><code>select password from users where userName='111'limit 0,1
</code></pre><p>8. 查询所有库</p>
<p>SQLServer写法:</p>
<pre><code>select * from [master]..[SysDatabases];
</code></pre><p>MySQL写法:</p>
<pre><code>SHOW DATABASES;
</code></pre><p>9. 查询指定库中的所有表</p>
<p>SQLServer写法：</p>
<pre><code>select * from 库名.dbo.[SysObjects] where[type]='U';
</code></pre><p>（注：若想知道[type]=’U’代表什么意思，请点击<a href="http://blog.csdn.net/winddai/article/details/5815138）" target="_blank" rel="noopener">http://blog.csdn.net/winddai/article/details/5815138）</a></p>
<p>MySQL写法:</p>
<pre><code>SHOW TABLES
</code></pre><p>10. 某些关键词的使用</p>
<p>10.1 截取字符串</p>
<ul>
<li>SQLServer只能使用<code>SUBSTRING</code>关键词来截取字符串</li>
<li>MySQL可以使用<code>SUBSTRING</code>和<code>SUBSTR</code>截取字符串</li>
</ul>
<p>10.2 取得字符串的长度</p>
<ul>
<li>SQLServer只能使用<code>Len</code>关键词取得字符串的长度。</li>
<li>MySQL可以使用<code>Length</code>取得字符串的长度。</li>
</ul>
]]></content>
<categories>
<category>db</category>
</categories>
<tags>
<tag>mysql</tag>
<tag>sql server</tag>
</tags>
</entry>
<entry>
<title>Phabricator Arcanist 基础使用</title>
<url>/tools/phabricator_arcanist.html</url>
<content><![CDATA[<p><strong>Arcanist</strong> 是访问<code>Pabricator</code>的命令行工具，它集成了静态分析(lint)，单元测试及代码review工作流类的功能，<a href="http://www.phabricator.com/docs/phabricator/article/Arcanist_User_Guide.html" target="_blank" rel="noopener">点击查看Arcanist官方文档</a>。</p>
<a id="more"></a>
<h1 id="安装-Linux-Mac-OS-X"><a href="#安装-Linux-Mac-OS-X" class="headerlink" title="安装(Linux/Mac OS X)"></a>安装(Linux/Mac OS X)</h1><p><strong>Arcanist</strong> 需要<code>php</code>支持，安装Arcanist之前，需要先安装 php。之后将<code>arcanist</code> 的源码下载到本地(将下载的源码放在同一个目录)。</p>
<figure class="highlight sh"><table><tr><td class="code"><pre><span class="line">$ mkdir {somewhere} <span class="comment"># 用实际的路径替换 {somewhere}</span></span><br><span class="line">$ <span class="built_in">cd</span> {somewhere}</span><br><span class="line">$ git <span class="built_in">clone</span> git://github.com/facebook/libphutil.git</span><br><span class="line">$ git <span class="built_in">clone</span> git://github.com/facebook/arcanist.git</span><br></pre></td></tr></table></figure>
<p>下载完源码后，配置<code>PATH</code>, 我们在命令行中，可以使用它。在个人的<code>～/.bashrc</code>或<code>~/.zshrc</code>，或者系统的<code>/etc/profile</code>中，加入下面内容。</p>
<pre><code>export PATH=$PATH:/{somewhere}/arcanist/bin/
</code></pre><p>在命令行，输入 <code>arc help</code> 验证是否安装成功。</p>
<h1 id="配置"><a href="#配置" class="headerlink" title="配置"></a>配置</h1><ul>
<li>配置默认编辑器，这里选择<code>vim</code>,也可以选择其他的。</li>
</ul>
<figure class="highlight sh"><table><tr><td class="code"><pre><span class="line">$ arc <span class="built_in">set</span>-config editor <span class="string">"vim"</span></span><br></pre></td></tr></table></figure>
<ul>
<li>配置默认的<code>Phabricator</code> 的URI，URI为Phabricator的地址</li>
</ul>
<figure class="highlight sh"><table><tr><td class="code"><pre><span class="line">$ arc <span class="built_in">set</span>-config default http://phabricator.example.com</span><br></pre></td></tr></table></figure>
<ul>
<li>项目的根目录创建<code>.arcconfig</code> 配置文件，文件中填入如下内容</li>
</ul>
<figure class="highlight sh"><table><tr><td class="code"><pre><span class="line">{</span><br><span class="line"> <span class="string">"project_id"</span> : <span class="string">"your project name"</span>,</span><br><span class="line"> <span class="string">"conduit_uri"</span> : <span class="string">"your phabricator url"</span></span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>项目中，还可以配置静态代码监测引擎(lint)和单元测试引擎。</p>
<p>为项目安装证书，用于 <code>Phabricator</code> 认证。</p>
<figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">$ arc install-certificate</span><br></pre></td></tr></table></figure>
<h1 id="arc-的使用"><a href="#arc-的使用" class="headerlink" title="arc 的使用"></a>arc 的使用</h1><ul>
<li><strong>查看帮助信息</strong></li>
</ul>
<p><code>arc help [--full | [COMMAND]]</code> 查看帮助文档，参数<code>--full</code>查看所有命令的详细用法; 具体的命令<code>[COMMAND]</code>，如｀arc help diff｀可以查看该命令的详细用法。</p>
<ul>
<li><strong>提交review信息</strong></li>
</ul>
<p>修改完代码后，使用<code>arc diff <path></code> 命令提交 review request，该命令会产生一个包含如下内容的文件要求填写：</p>
<figure class="highlight plain"><table><tr><td class="code"><pre><span class="line"><<Enter Revision Title>> </span><br><span class="line"></span><br><span class="line">Summary:</span><br><span class="line"></span><br><span class="line">Test Plan:</span><br><span class="line"></span><br><span class="line">Reviewers:</span><br><span class="line"></span><br><span class="line">CC:</span><br><span class="line"></span><br><span class="line">Maniphest Tasks:</span><br><span class="line"></span><br><span class="line"># NEW DIFFERENTIAL REVISION</span><br><span class="line"># Describe the changes in this new revision.</span><br><span class="line">#</span><br><span class="line"># arc could not identify any existing revision in your working copy.</span><br><span class="line"># If you intended to update an existing revision, use:</span><br><span class="line">#</span><br><span class="line"># $ arc diff --update <revision></span><br></pre></td></tr></table></figure>
<p> 按照提示填写后，保存退出，<code>arc</code>就会自动提交<code>request</code>。<code>Reviewers</code>用逗号隔开，<code>Maniphest Tasks</code>填相关联的Phabricator上的<code>task_id</code>，如 T100。Test plan暂时没用过，详情查看<a href="http://www.phabricator.com/docs/phabricator/article/Differential_User_Guide_Test_Plans.html" target="_blank" rel="noopener">官方文档</a>。</p>
<p>如果想和某一个分支比较，可以在命令中加上分支的名称，如 <code>arc diff poll-dev --create</code>, 当前分支会和<code>poll-dev</code> 分支比较，然后创建一个 <code>code review</code></p>
<p> 提交完成后，会产生一个形如<code>http://phabricator.example.com/D24</code>的url，url中的<code>D24</code>是<code>revision_id</code>。</p>
<ul>
<li><code>arc diff --update <revision_id></code> 更新对应的review request。该命令产生一个如下的文件，按提示填写保存退出，arc会提交更新。</li>
</ul>
<figure class="highlight plain"><table><tr><td class="code"><pre><span class="line"># Updating D27: hahahah</span><br><span class="line">#</span><br><span class="line"># Enter a brief description of the changes included in this update.</span><br><span class="line"># The first line is used as subject, next lines as comment.</span><br><span class="line">#</span><br><span class="line"># If you intended to create a new revision, use:</span><br><span class="line"># $ arc diff --create</span><br></pre></td></tr></table></figure>
<ul>
<li><p><code>arc commit --revision <revision_id></code> 提交对应提交代码更改，这个命令把<strong>svn commit</strong>的工作也做掉了，直接提交到代码库。如果代码仓库使用<strong>git</strong>，则该命令是<code>arc land</code></p>
</li>
<li><p><code>arc todo <description> [option]</code>可以快速给自己在phabricator上创建task，[option]用于把task CC给其他人.</p>
</li>
<li><code>arc tasks [options]</code> 查看Maniphest的tasks。</li>
<li><code>arc amend --show</code> 查看当前项目的differentials，</li>
<li><code>arc amend --revision <revision_id> --show</code> 查看指定revision_id的differential。</li>
</ul>
<p>其他几个有用的用法，未在项目中使用过。</p>
<blockquote>
<ul>
<li>show pending revision information with <code>arc list</code></li>
<li>find likely reviewers for a change with <code>arc cover</code></li>
<li>apply changes in a revision to the working copy with <code>arc patch</code></li>
<li>download a patch from Differential with <code>arc export</code>> </li>
<li>update Git commit messages after review with <code>arc amend</code></li>
<li>view enhanced information about Git branches with <code>arc branch</code></li>
</ul>
<p>Once you’ve configured lint and unit test integration, you can also:</p>
<ul>
<li>check your code for syntax and style errors with <code>arc lint</code> (see <a href="https://secure.phabricator.com/diviner/find/?name=Arcanist_User_Guide%3A_Lint&type=article&jump=1" target="_blank" rel="noopener">Arcanist User Guide: Lint</a>)</li>
<li>run unit tests that cover your changes with <code>arc unit</code></li>
</ul>
</blockquote>
<h1 id="参考"><a href="#参考" class="headerlink" title="参考"></a>参考</h1><ul>
<li><a href="https://secure.phabricator.com/book/phabricator/article/arcanist/" target="_blank" rel="noopener">Arcanist User Guide Phabricator User Documentation (Application User Guides)</a></li>
<li><a href="http://udn.yyuap.com/thread-39791-1-1.html" target="_blank" rel="noopener">白青青 - Phabricator命令行工具Arcanist的基本用法</a></li>
</ul>
]]></content>
<categories>
<category>tools</category>
</categories>
<tags>
<tag>tools</tag>
</tags>
</entry>
</search>