mirror of
https://github.com/sigmasternchen/php-doc-en
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102 lines
2.2 KiB
XML
102 lines
2.2 KiB
XML
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<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision: 1.2 $ -->
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<chapter xml:id="dba.examples" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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&reftitle.examples;
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<section xml:id="dba.example">
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<title>Basic usage</title>
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<para>
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<example>
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<title>DBA example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$id = dba_open("/tmp/test.db", "n", "db2");
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if (!$id) {
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echo "dba_open failed\n";
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exit;
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}
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dba_replace("key", "This is an example!", $id);
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if (dba_exists("key", $id)) {
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echo dba_fetch("key", $id);
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dba_delete("key", $id);
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}
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dba_close($id);
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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DBA is binary safe and does not have any arbitrary limits.
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However, it inherits all limits set by the underlying
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database implementation.
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</para>
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<para>
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All file-based databases must provide a way of setting the file
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mode of a new created database, if that is possible at all. The
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file mode is commonly passed as the fourth argument to
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<function>dba_open</function> or <function>dba_popen</function>.
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</para>
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<para>
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You can access all entries of a database in a linear way by using the
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<function>dba_firstkey</function> and <function>dba_nextkey</function>
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functions. You may not change the database while traversing it.
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</para>
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<para>
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<example>
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<title>Traversing a database</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// ...open database...
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$key = dba_firstkey($id);
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while ($key != false) {
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if (true) { // remember the key to perform some action later
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$handle_later[] = $key;
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}
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$key = dba_nextkey($id);
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}
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foreach ($handle_later as $val) {
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dba_delete($val, $id);
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}
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?>
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]]>
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</programlisting>
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</example>
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</para>
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</section>
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</chapter>
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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:"../../../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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