[redis.git] / doc / NonexistentCommands.html


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<!-- This is a (PRE) block.  Make sure it's left aligned or your toc title will be off. -->
<b>NonexistentCommands: Contents</b><br>&nbsp;&nbsp;<a href="#HGETSET">HGETSET</a><br>&nbsp;&nbsp;<a href="#SET with expire">SET with expire</a><br>&nbsp;&nbsp;<a href="#ZADDNX">ZADDNX</a>
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                <h1 class="wikiname">NonexistentCommands</h1>

                <div class="summary">
                    A list of commands that don't exist in Redis, but can be accomplished in a different way.
                </div>

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This is a list of commands that don't exist in Redis, but can be accomplished in a different way, usually by means of <a href="MultiExecCommand.html">WATCH/MULTI/EXEC</a>.<br/><br/>For better performance, you can pipeline multiple commands.<h1><a name="HGETSET">HGETSET</a></h1><a href="GetsetCommand.html">GETSET</a> for Hashes.<br/><br/><pre class="codeblock python" name="code">
WATCH foo
old_value = HGET foo field
MULTI
HSET foo field new_value
EXEC
</pre><h1><a name="SET with expire">SET with expire</a></h1>See <a href="SetexCommand.html">SETEX</a>.<h1><a name="ZADDNX">ZADDNX</a></h1>Add an element to a sorted set, only if the element doesn't already exist (by default, <a href="ZaddCommand.html">ZADD</a> would update the element's score if it already exists). <a href="http://groups.google.com/group/redis-db/browse_thread/thread/fc4c79d72e5bd346/6cdc07ecc36b81e7" target="_blank">See thread</a>.<br/><br/><pre class="codeblock python python" name="code">
WATCH foo
score = ZSCORE foo bar
IF score != NIL
  MULTI
  ZADD foo 1 bar
  EXEC
ENDIF
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6674e3b9	1
	2	<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
	3	<html>
	4	<head>
	5	<link type="text/css" rel="stylesheet" href="style.css" />
	6	</head>
	7	<body>
	8	<div id="page">
	9
	10	<div id='header'>
	11	<a href="index.html">
	12	<img style="border:none" alt="Redis Documentation" src="redis.png">
	13	</a>
	14	</div>
	15
	16	<div id="pagecontent">
	17	<div class="index">
	18	<!-- This is a (PRE) block. Make sure it's left aligned or your toc title will be off. -->
	19	<b>NonexistentCommands: Contents</b><br>  <a href="#HGETSET">HGETSET</a><br>  <a href="#SET with expire">SET with expire</a><br>  <a href="#ZADDNX">ZADDNX</a>
	20	</div>
	21
	22	<h1 class="wikiname">NonexistentCommands</h1>
	23
	24	<div class="summary">
	25	A list of commands that don't exist in Redis, but can be accomplished in a different way.
	26	</div>
	27
	28	<div class="narrow">
	29
	30	This is a list of commands that don't exist in Redis, but can be accomplished in a different way, usually by means of <a href="MultiExecCommand.html">WATCH/MULTI/EXEC</a>.<br/><br/>For better performance, you can pipeline multiple commands.<h1><a name="HGETSET">HGETSET</a></h1><a href="GetsetCommand.html">GETSET</a> for Hashes.<br/><br/><pre class="codeblock python" name="code">
	31	WATCH foo
	32	old_value = HGET foo field
	33	MULTI
	34	HSET foo field new_value
	35	EXEC
	36	</pre><h1><a name="SET with expire">SET with expire</a></h1>See <a href="SetexCommand.html">SETEX</a>.<h1><a name="ZADDNX">ZADDNX</a></h1>Add an element to a sorted set, only if the element doesn't already exist (by default, <a href="ZaddCommand.html">ZADD</a> would update the element's score if it already exists). <a href="http://groups.google.com/group/redis-db/browse_thread/thread/fc4c79d72e5bd346/6cdc07ecc36b81e7" target="_blank">See thread</a>.<br/><br/><pre class="codeblock python python" name="code">
	37	WATCH foo
	38	score = ZSCORE foo bar
	39	IF score != NIL
	40	MULTI
	41	ZADD foo 1 bar
	42	EXEC
	43	ENDIF
	44	</pre>
	45	</div>
	46
	47	</div>
	48	</div>
	49	</body>
	50	</html>
	51