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<p>事务就是一组原子性的SQL查询，或者说一个独立的工作单元。如果数据库引擎能够成功地对数据库应用该组查询的全部语句，那么就执行该组查询。如果其中有任何一条语句因为崩溃或其他原因无法执行，那么所有的语句都不会执行。也就是说，事务内的语句，要么全部执行成功，要么全部执行失败。本文涵盖了<strong>事务特性</strong>、<strong>并发事务问题</strong>和<strong>事务隔离级别</strong>三部分的简要总结。</p>
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<p><code>grep</code>是文本搜索最常用的命令，在日常日志排查过程中使用非常频繁。这篇文章对grep命令的使用方式做个总结</p>
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<div style="text-align: center;">新赛道，新征程。<br/>你好，滴滴！你好，橙心！</div>
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<p>字符串（String）在面试过程中被问到最多的就是“字符串对象为什么是不可变的？”，现在遇到这种题就是送分题了，标准答案网上随便一找有的是。但是，字符串对象真的不可以被改变么？</p>
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<p>说起内部类这个词儿，感觉既熟悉又陌生。熟悉，是因为开发中经常会用到；陌生，是因为即使开发中经常用到，但对底层实现不是很了解。我在写这篇文章之前，对内部类的一些细节一直存在忙点，直至在面试中遇到内部类相关的问题才顿悟，是时候总结一下内部类相关的知识点了。</p>
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<p>在这个人心普遍浮躁的时代，很多人尤其年轻人都或多或少有这样的疑惑。何以解忧？答曰：唯有暴富！</p>
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<p><code>模板方法模式</code>定义一个操作中的算法骨架，而将一些步骤延迟到子类中，模板方法使得子类可以不改变一个算法的结构即可重新定义该算法的某些特定步骤。<code>抽象工厂模式</code>是一种为调用者（客户端）提供一个<code>创建一组相关或相互依赖的对象</code>的接口，且调用者无需指定所要产品的具体类就能得到<code>同族不同等级的产品</code>的模式结构。而这两种设计模式在一起使用，彼此交融，将会碰撞出什么样的火花呢？</p>
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