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Diffstat (limited to 'doc/SortCommand.html')
| -rw-r--r-- | doc/SortCommand.html | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/doc/SortCommand.html b/doc/SortCommand.html index f89fd7c22..7ed3eb01f 100644 --- a/doc/SortCommand.html +++ b/doc/SortCommand.html @@ -16,7 +16,7 @@ <div id="pagecontent"> <div class="index"> <!-- This is a (PRE) block. Make sure it's left aligned or your toc title will be off. --> -<b>SortCommand: Contents</b><br> <a href="#Sorting by external keys">Sorting by external keys</a><br> <a href="#Retrieving external keys">Retrieving external keys</a><br> <a href="#Storing the result of a SORT operation">Storing the result of a SORT operation</a><br> <a href="#Return value">Return value</a> +<b>SortCommand: Contents</b><br> <a href="#Sorting by external keys">Sorting by external keys</a><br> <a href="#Retrieving external keys">Retrieving external keys</a><br> <a href="#Storing the result of a SORT operation">Storing the result of a SORT operation</a><br> <a href="#SORT and Hashes: BY and GET by hash field">SORT and Hashes: BY and GET by hash field</a><br> <a href="#Return value">Return value</a> </div> <h1 class="wikiname">SortCommand</h1> @@ -57,8 +57,12 @@ SORT mylist BY weight_* GET object_* GET # SORT mylist BY weight_* STORE resultkey </pre><blockquote>An interesting pattern using SORT ... STORE consists in associatingan <a href="ExpireCommand.html">EXPIRE</a> timeout to the resulting key so that inapplications where the result of a sort operation can be cached forsome time other clients will use the cached list instead to call SORTfor every request. When the key will timeout an updated version ofthe cache can be created using SORT ... STORE again.</blockquote> <blockquote>Note that implementing this pattern it is important to avoid that multipleclients will try to rebuild the cached version of the cacheat the same time, so some form of locking should be implemented(for instance using <a href="SetnxCommand.html">SETNX</a>).</blockquote> -<h2><a name="Return value">Return value</a></h2><a href="ReplyTypes.html">Multi bulk reply</a>, specifically a list of sorted elements. - +<h2><a name="SORT and Hashes: BY and GET by hash field">SORT and Hashes: BY and GET by hash field</a></h2> +<blockquote>It's possible to use BY and GET options against Hash fields using the following syntax:</blockquote><pre class="codeblock python python python python python python python python python" name="code"> +SORT mylist BY weight_*->fieldname +SORT mylist GET object_*->fieldname +</pre> +<blockquote>The two chars string -> is used in order to signal the name of the Hash field. The key is substituted as documented above with sort BY and GET against normal keys, and the Hash stored at the resulting key is accessed in order to retrieve the specified field.</blockquote><h2><a name="Return value">Return value</a></h2><a href="ReplyTypes.html">Multi bulk reply</a>, specifically a list of sorted elements. </div> </div> |