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</head><body><div id="web_bg" style="background-image: url(/img/48036836_p0.jpg);"></div><div id="sidebar"><div id="menu-mask"></div><div id="sidebar-menus"><div class="avatar-img text-center"><img src="/img/SekiBetu.png" onerror="this.onerror=null;this.src='/img/Starfetcher.jpg'" alt="avatar"/></div><div class="site-data text-center"><a href="/archives/"><div class="headline">文章</div><div class="length-num">18</div></a><a href="/tags/"><div class="headline">标签</div><div class="length-num">27</div></a><a href="/categories/"><div class="headline">分类</div><div class="length-num">0</div></a></div><div class="menus_items"><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fas fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" href="/archives/"><i class="fa-fw fas fa-archive"></i><span> 时间轴</span></a></div><div class="menus_item"><a class="site-page" href="/tags/"><i class="fa-fw fas fa-tags"></i><span> 标签</span></a></div><div class="menus_item"><a class="site-page" href="/link/"><i class="fa-fw fas fa-link"></i><span> 友链</span></a></div></div></div></div><div class="post" id="body-wrap"><header class="post-bg" id="page-header" style="background-image: url(/img/67861832_p0.jpg);"><nav id="nav"><span id="blog-info"><a class="nav-site-title" href="/"><span class="site-name">惜别的秘密基地</span></a><a class="nav-page-title" href="/"><span class="site-name">MySQL事物隔离级别笔记</span></a></span><div id="menus"><div class="menus_items"><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fas fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" href="/archives/"><i class="fa-fw fas fa-archive"></i><span> 时间轴</span></a></div><div class="menus_item"><a class="site-page" href="/tags/"><i class="fa-fw fas fa-tags"></i><span> 标签</span></a></div><div class="menus_item"><a class="site-page" href="/link/"><i class="fa-fw fas fa-link"></i><span> 友链</span></a></div></div><div id="toggle-menu"><span class="site-page"><i class="fas fa-bars fa-fw"></i></span></div></div></nav><div id="post-info"><h1 class="post-title">MySQL事物隔离级别笔记</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2020-07-18T06:11:17.000Z" title="发表于 2020-07-18 14:11:17">2020-07-18</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2022-06-17T13:31:56.000Z" title="更新于 2022-06-17 21:31:56">2022-06-17</time></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">总字数:</span><span class="word-count">274</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>1分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title=""><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">浏览量:</span><span id="busuanzi_value_page_pv"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="container post-content" id="article-container"><div id="post-outdate-notice" data="{"limitDay":365,"messagePrev":"本文创建在","messageNext":"天前,其中的内容有可能已经过时","postUpdate":"2022-06-17 21:31:56"}" hidden></div><table>
<thead>
<tr>
<th style="text-align:center">隔离级别</th>
<th style="text-align:center">脏读(Dirty Read)</th>
<th style="text-align:center">不可重复读(NonRepeatable Read)</th>
<th style="text-align:center">幻读(Phantom Read)</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:center">未提交读(Read uncommitted)</td>
<td style="text-align:center">yes</td>
<td style="text-align:center">yes</td>
<td style="text-align:center">yes</td>
</tr>
<tr>
<td style="text-align:center">已提交读(Read committed)</td>
<td style="text-align:center">no</td>
<td style="text-align:center">yes</td>
<td style="text-align:center">yes</td>
</tr>
<tr>
<td style="text-align:center">可重复读(Repeatable read)</td>
<td style="text-align:center">no</td>
<td style="text-align:center">no</td>
<td style="text-align:center">yes</td>
</tr>
<tr>
<td style="text-align:center">可串行化(Serializable )</td>
<td style="text-align:center">no</td>
<td style="text-align:center">no</td>
<td style="text-align:center">no</td>
</tr>
</tbody>
</table>
<ul>
<li>
<p>未提交读(Read uncommitted):能读取到别的事务未提交的数据</p>
</li>
<li>
<p>已提交读(Read committed):只能读取到别的事务已经提交的数据</p>
</li>
<li>
<p>可重复读(Repeatable):在读取数据后直接加锁,其他事务无法修改和删除这些数据,但是防不住 insert 的新数据</p>
</li>
<li>
<p>可串行化(Serializable):读取用读取锁,写入用写入锁,这两个锁互斥,这样能保证数据绝对安全,但是性能低下</p>
</li>
<li>
<p>脏读(Dirty Read):可以读取到未提交的数据</p>
</li>
<li>
<p><strong>不可重复读(NonRepeatable Read)</strong>:在读取完数据后数据又修改并 commit 了,导致第二次读取的数据与第一次数据不一致(重点在修改数据)</p>
</li>
<li>
<p>幻读(Phantom Read):两次读取期间有新数据加入或者旧数据删除,导致不一致(重点在增删数据)</p>
</li>
</ul>
</article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta"><i class="fas fa-circle-user fa-fw"></i>文章作者: </span><span class="post-copyright-info"><a href="https://sekibetu.com">SekiBetu</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta"><i class="fas fa-square-arrow-up-right fa-fw"></i>文章链接: </span><span class="post-copyright-info"><a href="https://sekibetu.com/mysql01.html">https://sekibetu.com/mysql01.html</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta"><i class="fas fa-circle-exclamation fa-fw"></i>版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外,均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来源 <a href="https://sekibetu.com" target="_blank">惜别的秘密基地</a>!</span></div></div><div class="tag_share"><div class="post-meta__tag-list"><a class="post-meta__tags" href="/tags/MySQL/">MySQL</a></div><div class="post-share"><div class="social-share" data-image="/img/67861832_p0.jpg" data-sites="facebook,twitter,wechat,weibo,qq"></div><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/sharejs/dist/css/share.min.css" media="print" onload="this.media='all'"><script src="https://cdn.jsdelivr.net/npm/[email protected]/sharejs/dist/js/social-share.min.js" defer></script></div></div><nav class="pagination-post" id="pagination"><a class="pagination-related" href="/pydecompile.html" title="记一次反编译PyInstaller打包的可执行文件获得其Python源码的过程"><img class="cover" src="/img/67861832_p0.jpg" onerror="onerror=null;src='/img/Starfetcher.jpg'" alt="cover of previous post"><div class="info"><div class="info-1"><div class="info-item-1">上一篇</div><div class="info-item-2">记一次反编译PyInstaller打包的可执行文件获得其Python源码的过程</div></div><div class="info-2"><div class="info-item-1">笔者因为一些原因,需要反编译别人打包好的 Python3 写的 exe 程序获得其源码,但是本人对于 Python 的反编译是一窍不通的,于是在十分钟的谷歌学习后,这篇文章诞生了 第一步 首先,我们安装完 python 并且配置好环境变量后,去下载 pyinstxtractor.py 这个工具,他能把 PyInstaller 打包的 exe 文件里包含的依赖库和已编译好的.pyd 或者.pyc 字节码文件给“解压”出来,这其中,.pyd 文件的反编译特别复杂(因为.pyd 其实是已经编译成.c 后封装成类似.dll 的东西了,根本看不出 Python 的源码了),技术力不足的我这部分无能为力,本次讲的是.pyc 的反编译。 1python pyinstxtractor.py Test.exe 运行工具“解压”完成后, 我们看到目录中生成了一个文件夹: 图中的 Test.exe_extracted 文件夹便是 Test.exe 文件被“解压”后的结果,然后我们找到类型为.pyc 的字节码文件(或者如下图所示的类型为文件的文件) 然后把他们改为后缀名为.pyc...</div></div></div></a><a class="pagination-related" href="/redis01.html" title="Redis笔记(自用)"><img class="cover" src="/img/67861832_p0.jpg" onerror="onerror=null;src='/img/Starfetcher.jpg'" alt="cover of next post"><div class="info text-right"><div class="info-1"><div class="info-item-1">下一篇</div><div class="info-item-2">Redis笔记(自用)</div></div><div class="info-2"><div class="info-item-1">Redis Redis: Remote Dictionary Server 三个特点: Redis 支持数据持久化. 可以将内存中的数据保持在磁盘中, 重启后可再次使用 Redis 支持 key-val, list, set, zset, hash 等数据结构存储 Redis 支持数据备份, master-slave 模式数据备份 零碎基础知识 单进程 (*) 单进程处理客户端的请求, 对读写事件响应是通过 epoll 函数而包装来操作. 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