mirror of
https://github.com/sigmasternchen/php-doc-en
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a8906b51ea
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@326156 c90b9560-bf6c-de11-be94-00142212c4b1
126 lines
3.2 KiB
XML
126 lines
3.2 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<refentry xml:id="mongocursor.tailable" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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<refnamediv>
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<refname>MongoCursor::tailable</refname>
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<refpurpose>Sets whether this cursor will be left open after fetching the last results</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<modifier>public</modifier> <type>MongoCursor</type><methodname>MongoCursor::tailable</methodname>
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<methodparam choice="opt"><type>bool</type><parameter>tail</parameter><initializer>true</initializer></methodparam>
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</methodsynopsis>
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<para>
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Mongo has a feature known as tailable cursors which are similar to the Unix
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"tail -f" command.
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</para>
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<para>
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Tailable means cursor is not closed when the last data is retrieved. Rather,
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the cursor marks the final object's position. you can resume using the
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cursor later, from where it was located, if more data were received.
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</para>
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<para>
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Like any "latent cursor", the cursor may become invalid at some point -- for
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example if that final object it references were deleted. Thus, you should be
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prepared to requery if the cursor is <function>MongoCursor::dead</function>.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term>
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<parameter>tail</parameter>
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</term>
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<listitem>
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<para>
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If the cursor should be tailable.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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Returns this cursor.
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</para>
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</refsect1>
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<refsect1 role="errors">
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&reftitle.errors;
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<para>
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Throws <classname>MongoCursorException</classname> if this cursor has started iterating.
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<example>
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<title><function>MongoCursor::tailable</function> example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$cursor = $collection->find()->tailable();
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$results = array();
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while (1) {
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if (!$cursor->hasNext()) {
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// we've read all the results, exit
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if ($cursor->dead()) {
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break;
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}
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// read all results so far, wait for more
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sleep(10);
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}
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else {
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$results[] = $cursor->getNext();
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}
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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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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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MongoDB core docs on <link xlink:href="&url.mongodb.dochub.tailable;">tailable cursors</link>.
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</para>
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<para>
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<simplelist>
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<member><function>MongoCursor::awaitData</function></member>
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</simplelist>
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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:"~/.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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