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643 lines
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643 lines
44 KiB
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<title>Database Caching Class — CodeIgniter 3.1.4 documentation</title>
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<link rel="top" title="CodeIgniter 3.1.4 documentation" href="../index.html"/>
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<link rel="up" title="Database Reference" href="index.html"/>
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<li class="toctree-l2"><a class="reference internal" href="../overview/goals.html">Architectural Goals</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/creating_drivers.html">Creating Drivers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/core_classes.html">Creating Core System Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/ancillary_classes.html">Creating Ancillary Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/hooks.html">Hooks - Extending the Framework Core</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/autoloader.html">Auto-loading Resources</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/common_functions.html">Common Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/compatibility_functions.html">Compatibility Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/routing.html">URI Routing</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/errors.html">Error Handling</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/caching.html">Caching</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/profiling.html">Profiling Your Application</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/cli.html">Running via the CLI</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/managing_apps.html">Managing your Applications</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/environments.html">Handling Multiple Environments</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/alternative_php.html">Alternate PHP Syntax for View Files</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/security.html">Security</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../general/styleguide.html">PHP Style Guide</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../libraries/index.html">Libraries</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/benchmark.html">Benchmarking Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/caching.html">Caching Driver</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/calendar.html">Calendaring Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/cart.html">Shopping Cart Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/config.html">Config Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/email.html">Email Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/encrypt.html">Encrypt Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/encryption.html">Encryption Library</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/file_uploading.html">File Uploading Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/form_validation.html">Form Validation</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/ftp.html">FTP Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/image_lib.html">Image Manipulation Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/input.html">Input Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/javascript.html">Javascript Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/language.html">Language Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/loader.html">Loader Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/migration.html">Migrations Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/output.html">Output Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/pagination.html">Pagination Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/parser.html">Template Parser Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/security.html">Security Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/sessions.html">Session Library</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/table.html">HTML Table Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/trackback.html">Trackback Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/typography.html">Typography Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/unit_testing.html">Unit Testing Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/uri.html">URI Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/user_agent.html">User Agent Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/zip.html">Zip Encoding Class</a></li>
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</ul>
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</li>
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</ul>
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<ul class="current">
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<li class="toctree-l1 current"><a class="reference internal" href="index.html">Database Reference</a><ul class="current">
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<li class="toctree-l2"><a class="reference internal" href="examples.html">Quick Start: Usage Examples</a></li>
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<li class="toctree-l2"><a class="reference internal" href="configuration.html">Database Configuration</a></li>
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<li class="toctree-l2"><a class="reference internal" href="connecting.html">Connecting to a Database</a></li>
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<li class="toctree-l2"><a class="reference internal" href="queries.html">Running Queries</a></li>
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<li class="toctree-l2"><a class="reference internal" href="results.html">Generating Query Results</a></li>
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<li class="toctree-l2"><a class="reference internal" href="helpers.html">Query Helper Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="query_builder.html">Query Builder Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="transactions.html">Transactions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="metadata.html">Getting MetaData</a></li>
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<li class="toctree-l2"><a class="reference internal" href="call_function.html">Custom Function Calls</a></li>
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<li class="toctree-l2 current"><a class="current reference internal" href="">Query Caching</a></li>
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<li class="toctree-l2"><a class="reference internal" href="forge.html">Database Manipulation with Database Forge</a></li>
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<li class="toctree-l2"><a class="reference internal" href="utilities.html">Database Utilities Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="db_driver_reference.html">Database Driver Reference</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../helpers/index.html">Helpers</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/array_helper.html">Array Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/captcha_helper.html">CAPTCHA Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/cookie_helper.html">Cookie Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/directory_helper.html">Directory Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/download_helper.html">Download Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/email_helper.html">Email Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/file_helper.html">File Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/form_helper.html">Form Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/html_helper.html">HTML Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/inflector_helper.html">Inflector Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/language_helper.html">Language Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/number_helper.html">Number Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/path_helper.html">Path Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/security_helper.html">Security Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/smiley_helper.html">Smiley Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/string_helper.html">String Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/text_helper.html">Text Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/typography_helper.html">Typography Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li>
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</ul>
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</li>
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</ul>
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<div class="section" id="database-caching-class">
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<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
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|
into your application. For example, let’s say you have a blog that
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|
allows user commenting. Whenever a new comment is submitted you’ll want
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|
to delete the cache files associated with the controller function that
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|
serves up your comments. You’ll find two delete functions described
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|
below that help you clear data.</p>
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</div>
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<div class="section" id="not-all-database-functions-work-with-caching">
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|
<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>
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|
<p>Lastly, we need to point out that the result object that is cached is a
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|
simplified version of the full result object. For that reason, some of
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|
the query result functions are not available for use.</p>
|
|
<p>The following functions ARE NOT available when using a cached result
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|
object:</p>
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|
<ul class="simple">
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|
<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>
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|
<div class="section" id="function-reference">
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|
<h3>Function Reference<a class="headerlink" href="#function-reference" title="Permalink to this headline">¶</a></h3>
|
|
</div>
|
|
</div>
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|
<div class="section" id="this-db-cache-on-this-db-cache-off">
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|
<h2>$this->db->cache_on() / $this->db->cache_off()<a class="headerlink" href="#this-db-cache-on-this-db-cache-off" title="Permalink to this headline">¶</a></h2>
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|
<p>Manually enables/disables caching. This can be useful if you want to
|
|
keep certain queries from being cached. Example:</p>
|
|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// Turn caching on</span>
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<span class="nv">$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>
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|
<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>
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|
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|
<span class="c1">// Turn caching off for this one query</span>
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|
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">cache_off</span><span class="p">();</span>
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|
<span class="nv">$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>
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|
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|
<span class="c1">// Turn caching back on</span>
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|
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">cache_on</span><span class="p">();</span>
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|
<span class="nv">$query</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="s2">"SELECT * FROM another_table"</span><span class="p">);</span>
|
|
</pre></div>
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</div>
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</div>
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|
<div class="section" id="this-db-cache-delete">
|
|
<h2>$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>
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