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<a href="/专栏/Redis 核心原理与实战/22 优秀的基数统计算法——HyperLogLog.md.html">22 优秀的基数统计算法——HyperLogLog.md.html</a>
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<a href="/专栏/Redis 核心原理与实战/23 内存淘汰机制与算法.md.html">23 内存淘汰机制与算法.md.html</a>
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<a href="/专栏/Redis 核心原理与实战/24 消息队列——发布订阅模式.md.html">24 消息队列——发布订阅模式.md.html</a>
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<a href="/专栏/Redis 核心原理与实战/25 消息队列的其他实现方式.md.html">25 消息队列的其他实现方式.md.html</a>
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<a href="/专栏/Redis 核心原理与实战/26 消息队列终极解决方案——Stream(上).md.html">26 消息队列终极解决方案——Stream(上).md.html</a>
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<a href="/专栏/Redis 核心原理与实战/27 消息队列终极解决方案——Stream(下).md.html">27 消息队列终极解决方案——Stream(下).md.html</a>
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<a href="/专栏/Redis 核心原理与实战/28 实战:分布式锁详解与代码.md.html">28 实战:分布式锁详解与代码.md.html</a>
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<a href="/专栏/Redis 核心原理与实战/29 实战:布隆过滤器安装与使用及原理分析.md.html">29 实战:布隆过滤器安装与使用及原理分析.md.html</a>
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<a href="/专栏/Redis 核心原理与实战/30 完整案例:实现延迟队列的两种方法.md.html">30 完整案例:实现延迟队列的两种方法.md.html</a>
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<a href="/专栏/Redis 核心原理与实战/32 实战:RediSearch 高性能的全文搜索引擎.md.html">32 实战:RediSearch 高性能的全文搜索引擎.md.html</a>
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<a href="/专栏/Redis 核心原理与实战/37 实战:Redis哨兵模式(上).md.html">37 实战:Redis哨兵模式(上).md.html</a>
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<a href="/专栏/Redis 核心原理与实战/38 实战:Redis 哨兵模式(下).md.html">38 实战:Redis 哨兵模式(下).md.html</a>
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<a href="/专栏/Redis 核心原理与实战/39 实战:Redis 集群模式(上).md.html">39 实战:Redis 集群模式(上).md.html</a>
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<a href="/专栏/Redis 核心原理与实战/43 加餐:Redis 的可视化管理工具.md.html">43 加餐:Redis 的可视化管理工具.md.html</a>
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let overlay = document.querySelector('.off-canvas-overlay')
|
||
|
||
sidebar.classList.add('show')
|
||
|
||
overlay.classList.add('show')
|
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|
||
}
|
||
|
||
function hide_canvas() {
|
||
|
||
let sidebar = document.querySelector('.book-sidebar')
|
||
|
||
let overlay = document.querySelector('.off-canvas-overlay')
|
||
|
||
sidebar.classList.remove('show')
|
||
|
||
overlay.classList.remove('show')
|
||
|
||
}
|
||
|
||
|
||
|
||
</script>
|
||
|
||
|
||
|
||
<div class="off-canvas-content">
|
||
|
||
<div class="columns">
|
||
|
||
<div class="column col-12 col-lg-12">
|
||
|
||
<div class="book-navbar">
|
||
|
||
<!-- For Responsive Layout -->
|
||
|
||
<header class="navbar">
|
||
|
||
<section class="navbar-section">
|
||
|
||
<a onclick="open_sidebar()">
|
||
|
||
<i class="icon icon-menu"></i>
|
||
|
||
</a>
|
||
|
||
</section>
|
||
|
||
</header>
|
||
|
||
</div>
|
||
|
||
<div class="book-content" style="max-width: 960px; margin: 0 auto;
|
||
|
||
overflow-x: auto;
|
||
|
||
overflow-y: hidden;">
|
||
|
||
<div class="book-post">
|
||
|
||
<p id="tip" align="center"></p>
|
||
|
||
<div><h1>13 附录:更多集合操作命令</h1>
|
||
|
||
<h3>移除并返回集合中的一个随机元素</h3>
|
||
|
||
<p>语法:spop key [count] 示例:</p>
|
||
|
||
<pre><code class="language-shell">127.0.0.1:6379> smembers myset
|
||
|
||
1) "v1"
|
||
|
||
2) "v2"
|
||
|
||
127.0.0.1:6379> spop myset 1
|
||
|
||
1) "v2"
|
||
|
||
127.0.0.1:6379> smembers myset
|
||
|
||
1) "v1"
|
||
|
||
|
||
|
||
</code></pre>
|
||
|
||
<h3>随机返回集合中指定数量的元素列表</h3>
|
||
|
||
<p>语法:srandmember key [count] 示例:</p>
|
||
|
||
<pre><code class="language-shell">127.0.0.1:6379> srandmember myset 2
|
||
|
||
1) "v4"
|
||
|
||
2) "v2"
|
||
|
||
|
||
|
||
</code></pre>
|
||
|
||
<h3>返回一个集合或多个集合的交集</h3>
|
||
|
||
<p>语法:sinter key [key ...] 示例:</p>
|
||
|
||
<pre><code class="language-shell">127.0.0.1:6379> smembers myset
|
||
|
||
1) "v1"
|
||
|
||
2) "v3"
|
||
|
||
3) "v2"
|
||
|
||
127.0.0.1:6379> smembers myset2
|
||
|
||
1) "v1"
|
||
|
||
2) "v8"
|
||
|
||
127.0.0.1:6379> sinter myset myset2
|
||
|
||
1) "v1"
|
||
|
||
|
||
|
||
</code></pre>
|
||
|
||
<h3>把集合的交集复制到新的集合中</h3>
|
||
|
||
<p>语法:sinterstore destination key [key ...] 示例:</p>
|
||
|
||
<pre><code class="language-shell">127.0.0.1:6379> smembers myset
|
||
|
||
1) "v1"
|
||
|
||
2) "v3"
|
||
|
||
3) "v2"
|
||
|
||
127.0.0.1:6379> smembers myset2
|
||
|
||
1) "v1"
|
||
|
||
2) "v8"
|
||
|
||
127.0.0.1:6379> sinterstore myset3 myset myset2
|
||
|
||
(integer) 1
|
||
|
||
127.0.0.1:6379> smembers myset3
|
||
|
||
1) "v1"
|
||
|
||
|
||
|
||
</code></pre>
|
||
|
||
<p>命令解析:从以上代码可以看出,我们把集合 myset 和 集合 myset2 的合集元素 v1 复制到了新的集合 myset3 中,但 v1 并不会从原有集合中移除。</p>
|
||
|
||
<h3>查询一个或多个集合的并集</h3>
|
||
|
||
<p>语法:sunion key [key ...] 示例:</p>
|
||
|
||
<pre><code class="language-shell">127.0.0.1:6379> smembers group1
|
||
|
||
1) "java"
|
||
|
||
127.0.0.1:6379> smembers group2
|
||
|
||
1) "golang"
|
||
|
||
127.0.0.1:6379> sunion group1 group2
|
||
|
||
1) "java"
|
||
|
||
2) "golang"
|
||
|
||
|
||
|
||
</code></pre>
|
||
|
||
<h3>把一个或多个集合的并集复制到新集合中</h3>
|
||
|
||
<p>语法:sunionstore destination key [key ...] 示例:</p>
|
||
|
||
<pre><code class="language-shell">127.0.0.1:6379> smembers group1
|
||
|
||
1) "java"
|
||
|
||
127.0.0.1:6379> smembers group2
|
||
|
||
1) "golang"
|
||
|
||
127.0.0.1:6379> sunionstore group3 group1 group2
|
||
|
||
(integer) 2
|
||
|
||
127.0.0.1:6379> smembers group3
|
||
|
||
1) "java"
|
||
|
||
2) "golang"
|
||
|
||
|
||
|
||
</code></pre>
|
||
|
||
<p>注意:只是把一个或多个集合的并集复制到新集合中,并不会在原集合中删除复制的元素。</p>
|
||
|
||
<h3>查询一个或多个集合的错集</h3>
|
||
|
||
<p>语法:sdiff key [key ...] 示例:</p>
|
||
|
||
<pre><code class="language-shell">127.0.0.1:6379> smembers group1
|
||
|
||
1) "java"
|
||
|
||
2) "golang"
|
||
|
||
127.0.0.1:6379> smembers group2
|
||
|
||
1) "golang"
|
||
|
||
127.0.0.1:6379> sdiff group1 group2
|
||
|
||
1) "java"
|
||
|
||
|
||
|
||
</code></pre>
|
||
|
||
<p>注意:执行命令时集合的先后顺序会影响返回的结果,如下所示:</p>
|
||
|
||
<pre><code class="language-shell">127.0.0.1:6379> sdiff group1 group2
|
||
|
||
1) "java"
|
||
|
||
127.0.0.1:6379> sdiff group2 group1
|
||
|
||
(empty list or set)
|
||
|
||
|
||
|
||
</code></pre>
|
||
|
||
<p>这是因为查询错集是以第一个集合为主的,当第二个元素包含第一个元素时,查询的错集结果就是空。</p>
|
||
|
||
<h3>把一个或多个集合的错集复制到新集合</h3>
|
||
|
||
<p>语法:sdiffstore destination key [key ...] 示例:</p>
|
||
|
||
<pre><code class="language-shell">127.0.0.1:6379> smembers group1
|
||
|
||
1) "java"
|
||
|
||
2) "golang"
|
||
|
||
127.0.0.1:6379> smembers group2
|
||
|
||
1) "golang"
|
||
|
||
127.0.0.1:6379> sdiffstore group3 group1 group2
|
||
|
||
(integer) 1
|
||
|
||
127.0.0.1:6379> smembers group3
|
||
|
||
1) "java"
|
||
|
||
|
||
|
||
</code></pre>
|
||
|
||
</div>
|
||
|
||
</div>
|
||
|
||
<div>
|
||
|
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