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<a class="post-title-link" href="/2020/04/12/记一次MySQL关于and和or的优先级的问题/" itemprop="url">记一次MySQL关于and和or的优先级的问题</a></h1>
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<p>最近在做毕设的时候 碰到了一个问题，需求是在指定一个字段为确定值的情况下，对其他所有字段进行模糊查询，具体SQL如下<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">select *,ROUND(DATEDIFF(CURDATE(), birthday)/365.2422) AS age from household where household_name like CONCAT('%',#{query},'%') </span><br><span class="line">or telephone like CONCAT('%',#{query},'%') or gender like CONCAT('%',#{query},'%') or address like CONCAT('%',#{query},'%') or birthday like binary CONCAT('%',#{query},'%') and is_f = '是'</span><br></pre></td></tr></table></figure></p>
<p>这条sql语句执行后，预期的结果是查出字段is_f为‘是’的所有行，但是执行后实际的结果为is_f为否的行也被查出来了，这并不符合预期，查谷歌后发现<br><strong><em>and的优先级比or要高，所以这么写，本SQL语句的意思就变成了 查出is_f为是，并且生日匹配查询字段，或者其他字段匹配的结果</em></strong><br>此处的解决办法是在where后和and前加括号，具体SQL如下，经试验结果符合预期<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">select *,ROUND(DATEDIFF(CURDATE(), birthday)/365.2422) AS age from household where (household_name like CONCAT('%',#{query},'%') </span><br><span class="line">or telephone like CONCAT('%',#{query},'%') or gender like CONCAT('%',#{query},'%') or address like CONCAT('%',#{query},'%') or birthday like binary CONCAT('%',#{query},'%')) and is_f = '是'</span><br></pre></td></tr></table></figure></p>
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<h1 id="http与https知识点"><a href="#http与https知识点" class="headerlink" title="http与https知识点"></a>http与https知识点</h1>
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<p>-写在之前:本文参考了Cyc2018大佬的CS-NOTES 中的关于MVCC的部分，仅仅做一个学习记录，也算是巩固这块的学习</p>
<h1 id="MVCC多版本并发控制"><a href="#MVCC多版本并发控制" class="headerlink" title="MVCC多版本并发控制"></a>MVCC多版本并发控制</h1><p>什么是MVCC？MVCC（Multi-Version Concurrency Control, MVCC）翻译过来就是多版本并发控制<br>
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<p>1.项目<br>2.如果缓存雪崩，大量请求直接打到数据库怎么办？(这答得不是特别好)<br>3.hashmap扩容多大，为啥<br>4.equals和==<br>5.为啥重写equals一定要重写hashcode<br>6.现在需要进行字符串拼接操作，让你做，你会怎么做，为什么<br>7.为啥不用String的加号<br>8.String a=”a”;String b=”b”; 问”a”+”b”等不等于a+b<br>9.volatile相关，没有问原理，问的是具体问题，就是与可见性相关<br>10.数据库用的mysql是吧？做过索引优化不？explain语句出来的结果中的type如果为index是啥意思<br>11.间隙锁锁的是数据还是索引<br>12.间隙锁解决的是啥问题<br>13.幻读会在哪种隔离级别中出现<br>14.如何解决幻读 11.了解TCP不，TCP断开连接的过程说一下（四次挥手）<br>15.知道time_wait吗？为啥要有这个状态<br>16.SpringMVC中容器的bean能访问到Spring容器中的bean吗？反过来呢<br>17.事务传播（不太会）<br>18.用过事务吗？如果spring的事务中抛出了IOException，会回滚吗？（我猜的会，但是好像是并不会回滚。。）<br>就记得这么多了。。<br>总结：都不是直接问原理，但是都偏向于给一个场景或者具体问题，问你怎么想，让你给出解决办法，然后问你为啥，这块基本就要结合原理和思考来说了，看来平时除了多看看理论还是要多敲一敲，多思考</p>
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