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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.5 $ -->
<refentry id="function.mysqli-multi-query">
<refnamediv>
<refname>mysqli_multi_query</refname>
<refname>mysqli->multi_query</refname>
<refpurpose>Performs a query on the database</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>Procedural style:</para>
<methodsynopsis>
<type>bool</type><methodname>mysqli_multi_query</methodname>
<methodparam><type>mysqli</type><parameter>link</parameter></methodparam>
<methodparam><type>string</type><parameter>query</parameter></methodparam>
</methodsynopsis>
<para>Object oriented style (method):</para>
<classsynopsis>
<ooclass><classname>mysqli</classname></ooclass>
<methodsynopsis>
<type>bool</type><methodname>multi_query</methodname>
<methodparam><type>string</type><parameter>query</parameter></methodparam>
</methodsynopsis>
</classsynopsis>
<para>
The <function>mysqli_multi_query</function> executes one or multiple queries
which are concatenated by a semicolon.
</para>
<para>
To retrieve the resultset from the first query you can use
<function>mysqli_use_result</function> or <function>mysqli_store_result</function>.
All subsequent query results can be processed using
<function>mysqli_more_results</function> and <function>mysqli_next_result</function>.
</para>
</refsect1>
<refsect1>
&reftitle.returnvalues;
<para>
<function>mysqli_multi_query</function> only returns &false; if the first statement failed.
To retrieve subsequent errors from other statements you have to call
<function>mysqli_next_result</function> first.
</para>
</refsect1>
<refsect1>
&reftitle.seealso;
<para>
<function>mysqli_use_result</function>,
<function>mysqli_store_result</function>,
<function>mysqli_next_result</function>&listendand;
<function>mysqli_more_results</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 = $mysqli->store_result()) {
while ($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_store_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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