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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.12 $ -->
<refentry id="function.mysqli-use-result">
<refnamediv>
<refname>mysqli_use_result</refname>
<refname>mysqli->use_result</refname>
<refpurpose>Initiate a result set retrieval</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>Procedural style:</para>
<methodsynopsis>
<type>mysqli_result</type><methodname>mysqli_use_result</methodname>
<methodparam><type>mysqli</type><parameter>link</parameter></methodparam>
</methodsynopsis>
<para>Object oriented style (method):</para>
<classsynopsis>
<ooclass><classname>mysqli</classname></ooclass>
<methodsynopsis>
<type>mysqli_result</type><methodname>use_result</methodname>
<void />
</methodsynopsis>
</classsynopsis>
<para>
<function>mysqli_use_result</function> is used to initiate the retrieval
of a result set from the last query executed using the
<function>mysqli_real_query</function> function on the database connection
specified by the <parameter>link</parameter> parameter. Either this or the
<function>mysqli_store_result</function> function must be called before the
results of a query can be retrieved, and one or the other must be called
to prevent the next query on that database connection from failing.
</para>
<note>
<para>
The <function>mysqli_use_result</function> function does not transfer
the entire result set from the database and hence cannot be used functions
such as <function>mysqli_data_seek</function> to move to a particular
row within the set. To use this functionality, the result set must be
stored using <function>mysqli_store_result</function>. One should not
use <function>mysqli_use_result</function> if a lot of processing on
the client side is performed, since this will tie up the server and
prevent other threads from updating any tables from which the data is
being fetched.
</para>
</note>
</refsect1>
<refsect1>
&reftitle.returnvalues;
<para>
Returns an unbuffered result object or &false; if an error occurred.
</para>
</refsect1>
<refsect1>
&reftitle.seealso;
<para>
<function>mysqli_real_query</function>&listendand;
<function>mysqli_store_result</function>.
</para>
</refsect1>
<refsect1>
&reftitle.examples;
<example>
<title>Object oriented style</title>
<programlisting role="php">
<![CDATA[
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
$query = "SELECT CURRENT_USER();";
$query .= "SELECT Name FROM City ORDER BY ID LIMIT 20, 5";
/* execute multi query */
if ($mysqli->multi_query($query)) {
do {
/* store first result set */
if ($result = $mysqli->use_result()) {
while ($row = $result->fetch_row()) {
printf("%s\n", $row[0]);
}
$result->close();
}
/* print divider */
if ($mysqli->more_results()) {
printf("-----------------\n");
}
} while ($mysqli->next_result());
}
/* close connection */
$mysqli->close();
?>
]]>
</programlisting>
</example>
<example>
<title>Procedural style</title>
<programlisting role="php">
<![CDATA[
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
$query = "SELECT CURRENT_USER();";
$query .= "SELECT Name FROM City ORDER BY ID LIMIT 20, 5";
/* execute multi query */
if (mysqli_multi_query($link, $query)) {
do {
/* store first result set */
if ($result = mysqli_use_result($link)) {
while ($row = mysqli_fetch_row($result)) {
printf("%s\n", $row[0]);
}
mysqli_free_result($result);
}
/* print divider */
if (mysqli_more_results($link)) {
printf("-----------------\n");
}
} while (mysqli_next_result($link));
}
/* close connection */
mysqli_close($link);
?>
]]>
</programlisting>
</example>
&example.outputs;
<screen>
<![CDATA[
my_user@localhost
-----------------
Amersfoort
Maastricht
Dordrecht
Leiden
Haarlemmermeer
]]>
</screen>
</refsect1>
</refentry>
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-->
<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
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sgml-default-dtd-file:"../../../../manual.ced"
sgml-exposed-tags:nil
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sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->
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