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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
96 lines
3.4 KiB
XML
96 lines
3.4 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.6 $ -->
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<refentry id="function.sybase-unbuffered-query">
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<refnamediv>
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<refname>sybase_unbuffered_query</refname>
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<refpurpose>Send a Sybase query and do not block</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>sybase_unbuffered_query</methodname>
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<methodparam><type>string</type><parameter>query</parameter></methodparam>
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<methodparam><type>resource</type><parameter>link_identifier</parameter></methodparam>
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</methodsynopsis>
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<para>
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Returns a positive Sybase result identifier on success, or
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&false; on error.
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</para>
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<para>
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<function>sybase_unbuffered_query</function> sends a query to the
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currently active database on the server that's associated with the specified
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link identifier. If the link identifier isn't specified, the last
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opened link is assumed. If no link is open, the function tries to
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establish a link as if <function>sybase_connect</function> was
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called, and use it.
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</para>
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<para>
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Unlike <function>sybase_query</function>,
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<function>sybase_unbuffered_query</function> reads only the first
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row of the result set. <function>sybase_fetch_array</function> and similar
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function read more rows as needed. <function>sybase_data_seek</function>
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reads up to the target row. The behavior may produce better performance
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for large result sets.
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</para>
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<para>
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<function>sybase_num_rows</function> will only return the correct number
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of rows if all result sets have been read. To Sybase, the number of rows
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is not known and is therefore computed by the client implementation.
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</para>
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<note>
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<para>
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If you don't read all of the resultsets prior to executing the next query,
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PHP will raise a warning and cancel all of the pending results. To get rid of
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this, use <function>sybase_free_result</function> which will cancel pending
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results of an unbuffered query.
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</para>
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</note>
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<para>
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The optional <parameter>store_result</parameter> can be &false; to indicate
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the resultsets shouldn't be fetched into memory, thus minimizing memory usage
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which is particularly interesting with very large resultsets.
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</para>
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<para>
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<example>
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<title><function>sybase_unbuffered_query</function> example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$dbh= sybase_connect('SYBASE', '', '');
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$q= sybase_unbuffered_query('select firstname, lastname from huge_table', $dbh, false);
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sybase_data_seek($q, 10000);
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$i= 0;
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while ($row= sybase_fetch_row($q)) {
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echo $row[0] . ' ' . $row[0];
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if ($i++ > 40000) break;
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}
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sybase_free_result($q);
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sybase_close($dbh);
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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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</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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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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