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<!DOCTYPE html>
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<div class="logo__title">TecX 编程/设计/数据/可视化</div>
<div class="logo__tagline">半分钟短技巧分享，技术博也可以很轻巧</div>
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<div class="wrapper flex">
<div class="primary">
<main class="main list" role="main">
<article class="list__item post">
<header class="list__header">
<h3 class="list__title post__title ">
<a href="/post/postgres_insert1/" rel="bookmark">
在Postgres中实现UPSERT UPDATE/INSERT 效果
</a>
</h3>
<div class="list__meta meta">
<div class="meta__item-datetime meta__item">
<svg class="meta__icon icon icon-time" width="16" height="14" viewBox="0 0 30 28"><path d="M15 0C7 0 1 6 1 14s6 14 14 14 14-6 14-14S23 0 15 0zm0 25C9 25 4 20 4 14S9 3 15 3s11 5 11 11-5 11-11 11zm1-18h-2v8.4l6.8 4.4L22 18l-6-3.8V7z"/></svg>
<time class="meta__text" datetime="2019-10-10T00:00:00">October 10, 2019</time>
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<span class="meta__text"><a class="meta__link" href="/categories/%e6%95%b0%e6%8d%ae%e5%ba%93" rel="category">数据库</a></span>
</div>
</div>
</header>
<div class="content list__excerpt post__content clearfix">
<p>上回我们在sqlite中达到了UPSERT UPDATE/INSERT的效果，那Postgres中该如何实现呢。</p>
</div>
</article><article class="list__item post">
<header class="list__header">
<h3 class="list__title post__title ">
<a href="/post/sqlite_insert1/" rel="bookmark">
在sqlite中实现UPSERT UPDATE/INSERT 效果
</a>
</h3>
<div class="list__meta meta">
<div class="meta__item-datetime meta__item">
<svg class="meta__icon icon icon-time" width="16" height="14" viewBox="0 0 30 28"><path d="M15 0C7 0 1 6 1 14s6 14 14 14 14-6 14-14S23 0 15 0zm0 25C9 25 4 20 4 14S9 3 15 3s11 5 11 11-5 11-11 11zm1-18h-2v8.4l6.8 4.4L22 18l-6-3.8V7z"/></svg>
<time class="meta__text" datetime="2019-10-06T00:00:00">October 06, 2019</time>
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</div>
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<div class="content list__excerpt post__content clearfix">
<p>有时候我们希望在sqlite中插入新数据，又不想用到REPLACE INTO，因为它类似于DELETE和INSERT的效果，如果想达到UPSERT UPDATE/INSERT的效果，那应该怎样做呢。</p>
</div>
</article><article class="list__item post">
<header class="list__header">
<h3 class="list__title post__title ">
<a href="/post/postgres_sys2/" rel="bookmark">
在Postgres中批量将表名或字段名改为英文小写
</a>
</h3>
<div class="list__meta meta">
<div class="meta__item-datetime meta__item">
<svg class="meta__icon icon icon-time" width="16" height="14" viewBox="0 0 30 28"><path d="M15 0C7 0 1 6 1 14s6 14 14 14 14-6 14-14S23 0 15 0zm0 25C9 25 4 20 4 14S9 3 15 3s11 5 11 11-5 11-11 11zm1-18h-2v8.4l6.8 4.4L22 18l-6-3.8V7z"/></svg>
<time class="meta__text" datetime="2019-10-05T00:00:00">October 05, 2019</time>
</div>
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<svg class="meta__icon icon icon-category" width="16" height="16" viewBox="0 0 16 16"><path d="m7 2l1 2h8v11h-16v-13z"/></svg>
<span class="meta__text"><a class="meta__link" href="/categories/%e6%95%b0%e6%8d%ae%e5%ba%93" rel="category">数据库</a></span>
</div>
</div>
</header>
<div class="content list__excerpt post__content clearfix">
<p>有时候为了方便处理我们需要将数据库中所有表格的表名统一成小写形式，或者某张表格中所有字段名改为小写，这里可以通过命令生成的方式变相地来实现</p>
</div>
</article><article class="list__item post">
<header class="list__header">
<h3 class="list__title post__title ">
<a href="/post/postgres_sys1/" rel="bookmark">
在Postgres中查询数据库的所有表或表中的所有字段
</a>
</h3>
<div class="list__meta meta">
<div class="meta__item-datetime meta__item">
<svg class="meta__icon icon icon-time" width="16" height="14" viewBox="0 0 30 28"><path d="M15 0C7 0 1 6 1 14s6 14 14 14 14-6 14-14S23 0 15 0zm0 25C9 25 4 20 4 14S9 3 15 3s11 5 11 11-5 11-11 11zm1-18h-2v8.4l6.8 4.4L22 18l-6-3.8V7z"/></svg>
<time class="meta__text" datetime="2019-10-05T00:00:00">October 05, 2019</time>
</div>
<div class="meta__item-categories meta__item">
<svg class="meta__icon icon icon-category" width="16" height="16" viewBox="0 0 16 16"><path d="m7 2l1 2h8v11h-16v-13z"/></svg>
<span class="meta__text"><a class="meta__link" href="/categories/%e6%95%b0%e6%8d%ae%e5%ba%93" rel="category">数据库</a></span>
</div>
</div>
</header>
<div class="content list__excerpt post__content clearfix">
<p>有时候我们需要将数据库中所有表格的信息，或者某张表格中所有字段的信息转化为查询结果，可以使用如下方法查询</p>
</div>
</article><article class="list__item post">
<header class="list__header">
<h3 class="list__title post__title ">
<a href="/post/postgres_doc1/" rel="bookmark">
使用copy命令通过命令行导入导出Postgres的数据
</a>
</h3>
<div class="list__meta meta">
<div class="meta__item-datetime meta__item">
<svg class="meta__icon icon icon-time" width="16" height="14" viewBox="0 0 30 28"><path d="M15 0C7 0 1 6 1 14s6 14 14 14 14-6 14-14S23 0 15 0zm0 25C9 25 4 20 4 14S9 3 15 3s11 5 11 11-5 11-11 11zm1-18h-2v8.4l6.8 4.4L22 18l-6-3.8V7z"/></svg>
<time class="meta__text" datetime="2019-10-04T00:00:00">October 04, 2019</time>
</div>
<div class="meta__item-categories meta__item">
<svg class="meta__icon icon icon-category" width="16" height="16" viewBox="0 0 16 16"><path d="m7 2l1 2h8v11h-16v-13z"/></svg>
<span class="meta__text"><a class="meta__link" href="/categories/%e6%95%b0%e6%8d%ae%e5%ba%93" rel="category">数据库</a></span>
</div>
</div>
</header>
<div class="content list__excerpt post__content clearfix">
<p>使用copy命令可以方便的在命令行中导入导出数据，实现两者的相互转换，相比其他方式效率和速度都有很大的优势。</p>
</div>
</article><article class="list__item post">
<header class="list__header">
<h3 class="list__title post__title ">
<a href="/post/sqlite_sys1/" rel="bookmark">
在sqlite中查询数据库的所有表或表中的所有字段
</a>
</h3>
<div class="list__meta meta">
<div class="meta__item-datetime meta__item">
<svg class="meta__icon icon icon-time" width="16" height="14" viewBox="0 0 30 28"><path d="M15 0C7 0 1 6 1 14s6 14 14 14 14-6 14-14S23 0 15 0zm0 25C9 25 4 20 4 14S9 3 15 3s11 5 11 11-5 11-11 11zm1-18h-2v8.4l6.8 4.4L22 18l-6-3.8V7z"/></svg>
<time class="meta__text" datetime="2019-10-04T00:00:00">October 04, 2019</time>
</div>
<div class="meta__item-categories meta__item">
<svg class="meta__icon icon icon-category" width="16" height="16" viewBox="0 0 16 16"><path d="m7 2l1 2h8v11h-16v-13z"/></svg>
<span class="meta__text"><a class="meta__link" href="/categories/%e6%95%b0%e6%8d%ae%e5%ba%93" rel="category">数据库</a></span>
</div>
</div>
</header>
<div class="content list__excerpt post__content clearfix">
<p>有时候我们需要将数据库中所有表格的信息，或者某张表格中所有字段的信息转化为查询结果，可以使用如下方法查询</p>
</div>
</article><article class="list__item post">
<header class="list__header">
<h3 class="list__title post__title ">
<a href="/post/sqlite_sys2/" rel="bookmark">
在sqlit中生成数字序列
</a>
</h3>
<div class="list__meta meta">
<div class="meta__item-datetime meta__item">
<svg class="meta__icon icon icon-time" width="16" height="14" viewBox="0 0 30 28"><path d="M15 0C7 0 1 6 1 14s6 14 14 14 14-6 14-14S23 0 15 0zm0 25C9 25 4 20 4 14S9 3 15 3s11 5 11 11-5 11-11 11zm1-18h-2v8.4l6.8 4.4L22 18l-6-3.8V7z"/></svg>
<time class="meta__text" datetime="2019-10-04T00:00:00">October 04, 2019</time>
</div>
<div class="meta__item-categories meta__item">
<svg class="meta__icon icon icon-category" width="16" height="16" viewBox="0 0 16 16"><path d="m7 2l1 2h8v11h-16v-13z"/></svg>
<span class="meta__text"><a class="meta__link" href="/categories/%e6%95%b0%e6%8d%ae%e5%ba%93" rel="category">数据库</a></span>
</div>
</div>
</header>
<div class="content list__excerpt post__content clearfix">
<p>利用CTE中的递归写法可以方便的sqlite中生成数字序列</p>
</div>
</article><article class="list__item post">
<header class="list__header">
<h3 class="list__title post__title ">
<a href="/post/mongodb_path/" rel="bookmark">
如何在mac/linux中修改mongodb的文件位置
</a>
</h3>
<div class="list__meta meta">
<div class="meta__item-datetime meta__item">
<svg class="meta__icon icon icon-time" width="16" height="14" viewBox="0 0 30 28"><path d="M15 0C7 0 1 6 1 14s6 14 14 14 14-6 14-14S23 0 15 0zm0 25C9 25 4 20 4 14S9 3 15 3s11 5 11 11-5 11-11 11zm1-18h-2v8.4l6.8 4.4L22 18l-6-3.8V7z"/></svg>
<time class="meta__text" datetime="2019-10-04T00:00:00">October 04, 2019</time>
</div>
<div class="meta__item-categories meta__item">
<svg class="meta__icon icon icon-category" width="16" height="16" viewBox="0 0 16 16"><path d="m7 2l1 2h8v11h-16v-13z"/></svg>
<span class="meta__text"><a class="meta__link" href="/categories/%e6%95%b0%e6%8d%ae%e5%ba%93" rel="category">数据库</a></span>
</div>
</div>
</header>
<div class="content list__excerpt post__content clearfix">
<p>通常数据库会占用大量的硬盘资源，如果希望移动mongodb可以先关闭数据库，将数据库文件夹从缺省的<code>/data/db</code>移动到新的位置，比如<code>/usr/local/mongodb-data</code>，然后运行</p>
</div>
</article><article class="list__item post">
<header class="list__header">
<h3 class="list__title post__title ">
<a href="/post/sqlite_time2/" rel="bookmark">
在sqlite中查询固定时间段的数据
</a>
</h3>
<div class="list__meta meta">
<div class="meta__item-datetime meta__item">
<svg class="meta__icon icon icon-time" width="16" height="14" viewBox="0 0 30 28"><path d="M15 0C7 0 1 6 1 14s6 14 14 14 14-6 14-14S23 0 15 0zm0 25C9 25 4 20 4 14S9 3 15 3s11 5 11 11-5 11-11 11zm1-18h-2v8.4l6.8 4.4L22 18l-6-3.8V7z"/></svg>
<time class="meta__text" datetime="2019-10-03T00:00:00">October 03, 2019</time>
</div>
<div class="meta__item-categories meta__item">
<svg class="meta__icon icon icon-category" width="16" height="16" viewBox="0 0 16 16"><path d="m7 2l1 2h8v11h-16v-13z"/></svg>
<span class="meta__text"><a class="meta__link" href="/categories/%e6%95%b0%e6%8d%ae%e5%ba%93" rel="category">数据库</a></span>
</div>
</div>
</header>
<div class="content list__excerpt post__content clearfix">
<p>固定时间段的查询是非常常用的功能，这里介绍几个sqlite中的语句。</p>
</div>
</article><article class="list__item post">
<header class="list__header">
<h3 class="list__title post__title ">
<a href="/post/sqlite_time1/" rel="bookmark">
将sqlite时间戳精确到毫秒
</a>
</h3>
<div class="list__meta meta">
<div class="meta__item-datetime meta__item">
<svg class="meta__icon icon icon-time" width="16" height="14" viewBox="0 0 30 28"><path d="M15 0C7 0 1 6 1 14s6 14 14 14 14-6 14-14S23 0 15 0zm0 25C9 25 4 20 4 14S9 3 15 3s11 5 11 11-5 11-11 11zm1-18h-2v8.4l6.8 4.4L22 18l-6-3.8V7z"/></svg>
<time class="meta__text" datetime="2019-10-03T00:00:00">October 03, 2019</time>
</div>
<div class="meta__item-categories meta__item">
<svg class="meta__icon icon icon-category" width="16" height="16" viewBox="0 0 16 16"><path d="m7 2l1 2h8v11h-16v-13z"/></svg>
<span class="meta__text"><a class="meta__link" href="/categories/%e6%95%b0%e6%8d%ae%e5%ba%93" rel="category">数据库</a></span>
</div>
</div>
</header>
<div class="content list__excerpt post__content clearfix">
<p>sqlite默认的时间戳10位，并不支持直接生成13位的毫秒级时间戳，使用拼接的方法可以实现。</p>
</div>
</article>
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<li class="widget__item"><a class="widget__link" href="/post/postgres_insert1/">在Postgres中实现UPSERT UPDATE/INSERT 效果</a></li>
<li class="widget__item"><a class="widget__link" href="/post/sqlite_insert1/">在sqlite中实现UPSERT UPDATE/INSERT 效果</a></li>
<li class="widget__item"><a class="widget__link" href="/post/postgres_sys2/">在Postgres中批量将表名或字段名改为英文小写</a></li>
<li class="widget__item"><a class="widget__link" href="/post/postgres_sys1/">在Postgres中查询数据库的所有表或表中的所有字段</a></li>
<li class="widget__item"><a class="widget__link" href="/post/postgres_doc1/">使用copy命令通过命令行导入导出Postgres的数据</a></li>
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