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diff --git a/user_guide/database/caching.html b/user_guide/database/caching.html deleted file mode 100644 index a6e160823..000000000 --- a/user_guide/database/caching.html +++ /dev/null @@ -1,642 +0,0 @@ - - -<!DOCTYPE html> -<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]--> -<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]--> -<head> - <meta charset="utf-8"> - <meta name="viewport" content="width=device-width, initial-scale=1.0"> - - <title>Database Caching Class — CodeIgniter 3.1.9 documentation</title> - - - - - <link rel="shortcut icon" href="../_static/ci-icon.ico"/> - - - - <link href='https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic|Roboto+Slab:400,700|Inconsolata:400,700&subset=latin,cyrillic' rel='stylesheet' type='text/css'> - - - - - - - - - - <link rel="stylesheet" href="../_static/css/citheme.css" type="text/css" /> - - - - <link rel="index" title="Index" - href="../genindex.html"/> - <link rel="search" 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class="wy-breadcrumbs-aside"> - - </li> - <div style="float:right;margin-left:5px;" id="closeMe"> - <img title="Classic Layout" alt="classic layout" src="data:image/gif;base64,R0lGODlhFAAUAJEAAAAAADMzM////wAAACH5BAUUAAIALAAAAAAUABQAAAImlI+py+0PU5gRBRDM3DxbWoXis42X13USOLauUIqnlsaH/eY6UwAAOw==" /> - </div> - </ul> - <hr/> -</div> - <div role="main" class="document"> - - <div class="section" id="database-caching-class"> -<h1>Database Caching Class<a class="headerlink" href="#database-caching-class" title="Permalink to this headline">¶</a></h1> -<p>The Database Caching Class permits you to cache your queries as text -files for reduced database load.</p> -<div class="admonition important"> -<p class="first admonition-title">Important</p> -<p class="last">This class is initialized automatically by the database -driver when caching is enabled. Do NOT load this class manually.</p> -</div> -<div class="admonition important"> -<p class="first admonition-title">Important</p> -<p class="last">Not all query result functions are available when you -use caching. Please read this page carefully.</p> -</div> -<div class="section" id="enabling-caching"> -<h2>Enabling Caching<a class="headerlink" href="#enabling-caching" title="Permalink to this headline">¶</a></h2> -<p>Caching is enabled in three steps:</p> -<ul class="simple"> -<li>Create a writable directory on your server where the cache files can -be stored.</li> -<li>Set the path to your cache folder in your -application/config/database.php file.</li> -<li>Enable the caching feature, either globally by setting the preference -in your application/config/database.php file, or manually as -described below.</li> -</ul> -<p>Once enabled, caching will happen automatically whenever a page is -loaded that contains database queries.</p> -</div> -<div class="section" id="how-does-caching-work"> -<h2>How Does Caching Work?<a class="headerlink" href="#how-does-caching-work" title="Permalink to this headline">¶</a></h2> -<p>CodeIgniter’s query caching system happens dynamically when your pages -are viewed. When caching is enabled, the first time a web page is -loaded, the query result object will be serialized and stored in a text -file on your server. The next time the page is loaded the cache file -will be used instead of accessing your database. Your database usage can -effectively be reduced to zero for any pages that have been cached.</p> -<p>Only read-type (SELECT) queries can be cached, since these are the only -type of queries that produce a result. Write-type (INSERT, UPDATE, etc.) -queries, since they don’t generate a result, will not be cached by the -system.</p> -<p>Cache files DO NOT expire. Any queries that have been cached will remain -cached until you delete them. The caching system permits you clear -caches associated with individual pages, or you can delete the entire -collection of cache files. Typically you’ll want to use the housekeeping -functions described below to delete cache files after certain events -take place, like when you’ve added new information to your database.</p> -</div> -<div class="section" id="will-caching-improve-your-site-s-performance"> -<h2>Will Caching Improve Your Site’s Performance?<a class="headerlink" href="#will-caching-improve-your-site-s-performance" title="Permalink to this headline">¶</a></h2> -<p>Getting a performance gain as a result of caching depends on many -factors. If you have a highly optimized database under very little load, -you probably won’t see a performance boost. If your database is under -heavy use you probably will see an improved response, assuming your -file-system is not overly taxed. Remember that caching simply changes -how your information is retrieved, shifting it from being a database -operation to a file-system one.</p> -<p>In some clustered server environments, for example, caching may be -detrimental since file-system operations are so intense. On single -servers in shared environments, caching will probably be beneficial. -Unfortunately there is no single answer to the question of whether you -should cache your database. It really depends on your situation.</p> -</div> -<div class="section" id="how-are-cache-files-stored"> -<h2>How are Cache Files Stored?<a class="headerlink" href="#how-are-cache-files-stored" title="Permalink to this headline">¶</a></h2> -<p>CodeIgniter places the result of EACH query into its own cache file. -Sets of cache files are further organized into sub-folders corresponding -to your controller functions. To be precise, the sub-folders are named -identically to the first two segments of your URI (the controller class -name and function name).</p> -<p>For example, let’s say you have a controller called blog with a function -called comments that contains three queries. The caching system will -create a cache folder called blog+comments, into which it will write -three cache files.</p> -<p>If you use dynamic queries that change based on information in your URI -(when using pagination, for example), each instance of the query will -produce its own cache file. It’s possible, therefore, to end up with -many times more cache files than you have queries.</p> -</div> -<div class="section" id="managing-your-cache-files"> -<h2>Managing your Cache Files<a class="headerlink" href="#managing-your-cache-files" title="Permalink to this headline">¶</a></h2> -<p>Since cache files do not expire, you’ll need to build deletion routines -into your application. For example, let’s say you have a blog that -allows user commenting. Whenever a new comment is submitted you’ll want -to delete the cache files associated with the controller function that -serves up your comments. You’ll find two delete functions described -below that help you clear data.</p> -</div> -<div class="section" id="not-all-database-functions-work-with-caching"> -<h2>Not All Database Functions Work with Caching<a class="headerlink" href="#not-all-database-functions-work-with-caching" title="Permalink to this headline">¶</a></h2> -<p>Lastly, we need to point out that the result object that is cached is a -simplified version of the full result object. For that reason, some of -the query result functions are not available for use.</p> -<p>The following functions ARE NOT available when using a cached result -object:</p> -<ul class="simple"> -<li>num_fields()</li> -<li>field_names()</li> -<li>field_data()</li> -<li>free_result()</li> -</ul> -<p>Also, the two database resources (result_id and conn_id) are not -available when caching, since result resources only pertain to run-time -operations.</p> -<div class="section" id="function-reference"> -<h3>Function Reference<a class="headerlink" href="#function-reference" title="Permalink to this headline">¶</a></h3> -</div> -</div> -<div class="section" id="this-db-cache-on-this-db-cache-off"> -<h2>$this->db->cache_on() / $this->db->cache_off()<a class="headerlink" href="#this-db-cache-on-this-db-cache-off" title="Permalink to this headline">¶</a></h2> -<p>Manually enables/disables caching. This can be useful if you want to -keep certain queries from being cached. Example:</p> -<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// Turn caching on</span> -<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">cache_on</span><span class="p">();</span> -<span class="nv">$query</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="s2">"SELECT * FROM mytable"</span><span class="p">);</span> - -<span class="c1">// Turn caching off for this one query</span> -<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">cache_off</span><span class="p">();</span> -<span class="nv">$query</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="s2">"SELECT * FROM members WHERE member_id = '</span><span class="si">$current_user</span><span class="s2">'"</span><span class="p">);</span> - -<span class="c1">// Turn caching back on</span> -<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">cache_on</span><span class="p">();</span> -<span class="nv">$query</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="s2">"SELECT * FROM another_table"</span><span class="p">);</span> -</pre></div> -</div> -</div> -<div class="section" id="this-db-cache-delete"> -<h2>$this->db->cache_delete()<a class="headerlink" href="#this-db-cache-delete" title="Permalink to this headline">¶</a></h2> -<p>Deletes the cache files associated with a particular page. This is -useful if you need to clear caching after you update your database.</p> -<p>The caching system saves your cache files to folders that correspond to -the URI of the page you are viewing. For example, if you are viewing a -page at example.com/index.php/blog/comments, the caching system will put -all cache files associated with it in a folder called blog+comments. To -delete those particular cache files you will use:</p> -<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">cache_delete</span><span class="p">(</span><span class="s1">'blog'</span><span class="p">,</span> <span class="s1">'comments'</span><span class="p">);</span> -</pre></div> -</div> -<p>If you do not use any parameters the current URI will be used when -determining what should be cleared.</p> -</div> -<div class="section" id="this-db-cache-delete-all"> -<h2>$this->db->cache_delete_all()<a class="headerlink" href="#this-db-cache-delete-all" title="Permalink to this headline">¶</a></h2> -<p>Clears all existing cache files. Example:</p> -<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">cache_delete_all</span><span class="p">();</span> -</pre></div> -</div> -</div> -</div> - - - </div> - <footer> - - <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> - - <a href="forge.html" class="btn btn-neutral float-right" title="Database Forge Class">Next <span class="fa fa-arrow-circle-right"></span></a> - - - <a href="call_function.html" class="btn btn-neutral" title="Custom Function Calls"><span class="fa fa-arrow-circle-left"></span> Previous</a> - - </div> - - - <hr/> - - <div role="contentinfo"> - <p> - © Copyright 2014 - 2018, British Columbia Institute of Technology. - Last updated on Jun 12, 2018. - </p> - </div> - - Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a <a href="https://github.com/snide/sphinx_rtd_theme">theme</a> provided by <a href="https://readthedocs.org">Read the Docs</a>. - -</footer> - </div> - </div> - - </section> - - </div> - - - - - - <script type="text/javascript"> - var DOCUMENTATION_OPTIONS = { - URL_ROOT:'../', - VERSION:'3.1.9', - COLLAPSE_INDEX:false, - FILE_SUFFIX:'.html', - HAS_SOURCE: false - }; - </script> - <script type="text/javascript" src="../_static/jquery.js"></script> - <script type="text/javascript" src="../_static/underscore.js"></script> - <script type="text/javascript" src="../_static/doctools.js"></script> - - - - - - <script type="text/javascript" src="../_static/js/theme.js"></script> - - - - - <script type="text/javascript"> - jQuery(function () { - SphinxRtdTheme.StickyNav.enable(); - }); - </script> - - -</body> -</html>
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