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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 299161 $ -->
<refentry xml:id="mysqli-stmt.result-metadata" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>mysqli_stmt::result_metadata</refname>
<refname>mysqli_stmt_result_metadata</refname>
<refpurpose>Returns result set metadata from a prepared statement</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<para>&style.oop;</para>
<methodsynopsis>
<type>mysqli_result</type><methodname>mysqli_stmt::result_metadata</methodname>
<void />
</methodsynopsis>
<para>&style.procedural;</para>
<methodsynopsis>
<type>mysqli_result</type><methodname>mysqli_stmt_result_metadata</methodname>
<methodparam><type>mysqli_stmt</type><parameter>stmt</parameter></methodparam>
</methodsynopsis>
<para>
If a statement passed to <function>mysqli_prepare</function> is one that produces
a result set, <function>mysqli_stmt_result_metadata</function> returns the result object
that can be used to process the meta information such as total number of fields
and individual field information.
</para>
<note>
<para>This result set pointer can be passed as an argument to any of the
field-based functions that process result set metadata, such as:
<itemizedlist>
<listitem><para><function>mysqli_num_fields</function></para></listitem>
<listitem><para><function>mysqli_fetch_field</function></para></listitem>
<listitem><para><function>mysqli_fetch_field_direct</function></para></listitem>
<listitem><para><function>mysqli_fetch_fields</function></para></listitem>
<listitem><para><function>mysqli_field_count</function></para></listitem>
<listitem><para><function>mysqli_field_seek</function></para></listitem>
<listitem><para><function>mysqli_field_tell</function></para></listitem>
<listitem><para><function>mysqli_free_result</function></para></listitem>
</itemizedlist>
</para>
</note>
<para>
The result set structure should be freed when you are done with it,
which you can do by passing it to <function>mysqli_free_result</function>
</para>
<note>
<para>
The result set returned by <function>mysqli_stmt_result_metadata</function> contains only
metadata. It does not contain any row results. The rows are obtained by using the
statement handle with <function>mysqli_stmt_fetch</function>.
</para>
</note>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
&mysqli.stmt.description;
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns a result object or &false; if an error occurred.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<example>
<para>&style.oop;</para>
<programlisting role='php'>
<![CDATA[
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "test");
$mysqli->query("DROP TABLE IF EXISTS friends");
$mysqli->query("CREATE TABLE friends (id int, name varchar(20))");
$mysqli->query("INSERT INTO friends VALUES (1,'Hartmut'), (2, 'Ulf')");
$stmt = $mysqli->prepare("SELECT id, name FROM friends");
$stmt->execute();
/* get resultset for metadata */
$result = $stmt->result_metadata();
/* retrieve field information from metadata result set */
$field = $result->fetch_field();
printf("Fieldname: %s\n", $field->name);
/* close resultset */
$result->close();
/* close connection */
$mysqli->close();
?>
]]>
</programlisting>
<para>&style.procedural;</para>
<programlisting role='php'>
<![CDATA[
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "test");
mysqli_query($link, "DROP TABLE IF EXISTS friends");
mysqli_query($link, "CREATE TABLE friends (id int, name varchar(20))");
mysqli_query($link, "INSERT INTO friends VALUES (1,'Hartmut'), (2, 'Ulf')");
$stmt = mysqli_prepare($link, "SELECT id, name FROM friends");
mysqli_stmt_execute($stmt);
/* get resultset for metadata */
$result = mysqli_stmt_result_metadata($stmt);
/* retrieve field information from metadata result set */
$field = mysqli_fetch_field($result);
printf("Fieldname: %s\n", $field->name);
/* close resultset */
mysqli_free_result($result);
/* close connection */
mysqli_close($link);
?>
]]>
</programlisting>
</example>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>mysqli_prepare</function></member>
<member><function>mysqli_free_result</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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