mirror of
https://github.com/sigmasternchen/php-doc-en
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d9e565cad1
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@301137 c90b9560-bf6c-de11-be94-00142212c4b1
124 lines
3 KiB
XML
124 lines
3 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<appendix xml:id="mysqlnd-qc.constants" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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&reftitle.constants;
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&extension.constants;
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<para>
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<emphasis role="bold">SQL hint related</emphasis>
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</para>
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<para>
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<example>
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<para>
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The query cache is controled by SQL hints. SQL hints are used to enable and
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disable caching. SQL hints can be used to set the
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<literal>TTL</literal> of a query.
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</para>
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<para>
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The SQL hints recognized by the query cache can be manually changed at
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compile time. This makes it possible to use
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<literal>mysqlnd_qc</literal> in environments in which the default
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SQL hints are already taken and interpreted by other systems. Therefore
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it is recommended to use the SQL hint string constants instead of
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manually adding the default SQL hints to the query string.
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</para>
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<programlisting role="php">
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<![CDATA[
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<?php
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/* Use constants for maximum portability */
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$query = "/*" . MYSQLND_QC_ENABLE_SWITCH . "*/SELECT id FROM test";
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/* Valid but less portable: default TTL */
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$query = "/*qc=on*/SELECT id FROM test";
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/* Valid but less portable: per statement TTL */
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$query = "/*qc=on*//*qc_ttl=5*/SELECT id FROM test";
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printf("MYSQLND_QC_ENABLE_SWITCH: %s\n", MYSQLND_QC_ENABLE_SWITCH);
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printf("MYSQLND_QC_DISABLE_SWITCH: %s\n", MYSQLND_QC_DISABLE_SWITCH);
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printf("MYSQLND_QC_TTL_SWITCH: %s\n", MYSQLND_QC_TTL_SWITCH);
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?>
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]]>
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</programlisting>
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&examples.outputs;
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<screen>
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<![CDATA[
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MYSQLND_QC_ENABLE_SWITCH: qc=on
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MYSQLND_QC_DISABLE_SWITCH: qc=off
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MYSQLND_QC_TTL_SWITCH: qc_ttl=
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]]>
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</screen>
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</example>
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</para>
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<para>
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<variablelist>
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<varlistentry>
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<term>
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<constant>MYSQLND_QC_ENABLE_SWITCH</constant>
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(
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<type>string</type>)
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</term>
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<listitem>
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<simpara>
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SQL hint used to enable caching of a query.
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</simpara>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<constant>MYSQLND_QC_DISABLE_SWITCH</constant>
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(
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<type>string</type>)
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</term>
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<listitem>
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<simpara>
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SQL hint used to disable caching of a query if
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<literal>mysqlnd_qc.cache_by_default = 1</literal>.
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</simpara>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<constant>MYSQLND_QC_TTL_SWITCH</constant>
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(
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<type>string</type>)
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</term>
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<listitem>
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<simpara>
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SQL hint used to set the TTL of a result set.
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</simpara>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</appendix>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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