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https://github.com/sigmasternchen/php-doc-en
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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@146902 c90b9560-bf6c-de11-be94-00142212c4b1
75 lines
2.7 KiB
XML
75 lines
2.7 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.6 $ -->
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<refentry id="function.sqlite-popen">
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<refnamediv>
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<refname>sqlite_popen</refname>
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<refpurpose>
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Opens a persistent handle to an SQLite database. Will create the
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database if it does not exist.
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</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<methodsynopsis>
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<type>resource</type><methodname>sqlite_popen</methodname>
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<methodparam><type>string</type><parameter>filename</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>mode</parameter></methodparam>
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<methodparam choice="opt"><type>string</type><parameter>&error_message</parameter></methodparam>
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</methodsynopsis>
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<simpara>
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This function behaves identically to <function>sqlite_open</function>
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except that is uses the persistent resource mechanism of PHP.
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For information about the meaning of the parameters, read the
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<function>sqlite_open</function> manual page.
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</simpara>
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<para>
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<function>sqlite_popen</function> will first check to see if a persistent
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handle has already been opened for the given
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<parameter>filename</parameter>. If it finds one, it returns that handle
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to your script, otherwise it opens a fresh handle to the database.
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</para>
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<para>
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The benefit of this approach is that you don't incur the performance
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cost of re-reading the database and index schema on each page hit served
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by persistent web server SAPI's (any SAPI except for regular CGI or CLI).
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</para>
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<note>
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<simpara>
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If you use persistent handles and have the database updated by a
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background process (perhaps via a crontab), and that process re-creates
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the database by overwriting it (either by unlinking and rebuilding, or
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moving the updated version to replace the current version),
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you may experience undefined behaviour when a persistent handle on the
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old version of the database is recycled.
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</simpara>
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<simpara>
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To avoid this situation, have your background processes open the same
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database file and perform their updates in a transaction.
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</simpara>
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</note>
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<para>
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See also <function>sqlite_open</function>,
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<function>sqlite_close</function> and
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<function>sqlite_query</function>.
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</para>
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</refsect1>
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</refentry>
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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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sgml-parent-document:nil
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sgml-default-dtd-file:"../../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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