41 lines
2.2 KiB
HTML
41 lines
2.2 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
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<html>
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<head>
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<link type="text/css" rel="stylesheet" href="style.css" />
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</head>
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<body>
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<div id="page">
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<div id='header'>
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<a href="index.html">
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<img style="border:none" alt="Redis Documentation" src="redis.png">
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</a>
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</div>
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<div id="pagecontent">
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<div class="index">
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<!-- This is a (PRE) block. Make sure it's left aligned or your toc title will be off. -->
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<b>GetsetCommand: Contents</b><br> <a href="#GETSET _key_ _value_">GETSET _key_ _value_</a><br> <a href="#Return value">Return value</a><br> <a href="#Design patterns">Design patterns</a><br> <a href="#See also">See also</a>
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</div>
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<h1 class="wikiname">GetsetCommand</h1>
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<div class="summary">
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<div class="narrow">
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<h1><a name="GETSET _key_ _value_">GETSET _key_ _value_</a></h1>
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<i>Time complexity: O(1)</i><blockquote>GETSET is an atomic <i>set this value and return the old value</i> command.Set <i>key</i> to the string <i>value</i> and return the old value stored at <i>key</i>.The string can't be longer than 1073741824 bytes (1 GB).</blockquote>
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<h2><a name="Return value">Return value</a></h2><a href="ReplyTypes.html">Bulk reply</a><h2><a name="Design patterns">Design patterns</a></h2><blockquote>GETSET can be used together with INCR for counting with atomic reset whena given condition arises. For example a process may call INCR against thekey <i>mycounter</i> every time some event occurred, but from time totime we need to get the value of the counter and reset it to zero atomicallyusing <code name="code" class="python">GETSET mycounter 0</code>.</blockquote>
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<h2><a name="See also">See also</a></h2>
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<ul><li> <a href="GetCommand.html">GET</a></li><li> <a href="SetCommand.html">SET</a></li><li> <a href="SetnxCommand.html">SETNX</a></li></ul>
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</html>
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