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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.9 $ -->
<refentry id="function.mysqli-stmt-affected-rows">
<refnamediv>
<refname>mysqli_stmt_affected_rows</refname>
<refname>mysqli_stmt->affected_rows</refname>
<refpurpose>Returns the total number of rows changed, deleted, or
inserted by the last executed statement
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>Procedural style :</para>
<methodsynopsis>
<type>int</type><methodname>mysqli_stmt_affected_rows</methodname>
<methodparam><type>mysqli_stmt</type><parameter>stmt</parameter></methodparam>
</methodsynopsis>
<para>Object oriented style (property):</para>
<classsynopsis>
<ooclass><classname>mysqli_stmt</classname></ooclass>
<fieldsynopsis><type>int</type><varname>affected_rows</varname></fieldsynopsis>
</classsynopsis>
<para>
<function>mysqli_stmt_affected_rows</function> returns the number of rows affected
by INSERT, UPDATE, or DELETE query. If the last query was invalid, this function will return -1.
</para>
<para>
The <function>mysqli_stmt_affected_rows</function> function only works with queries
which update a table. In order to return the number of rows from a SELECT query, use
the <function>mysqli_stmt_num_rows</function> function instead.
</para>
</refsect1>
<refsect1>
&reftitle.returnvalues;
<para>
An integer greater than zero indicates the number of rows affected or retrieved.
Zero indicates that no records where updated for an UPDATE/DELETE statement, no
rows matched the WHERE clause in the query or that no query has yet been executed.
-1 indicates that the query has returned an error.
</para>
<note>
<para>
If the number of affected rows is greater than maximal PHP int value, the number of
affected rows will be returned as a string value.
</para>
</note>
</refsect1>
<refsect1>
&reftitle.seealso;
<para>
<function>mysqli_stmt_num_rows</function>&listendand;
<function>mysqli_prepare</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();
}
/* create temp table */
$mysqli->query("CREATE TEMPORARY TABLE myCountry LIKE Country");
$query = "INSERT INTO myCountry SELECT * FROM Country WHERE Code LIKE ?";
/* prepare statement */
if ($stmt = $mysqli->prepare($query)) {
/* Bind variable for placeholder */
$code = 'A%';
$stmt->bind_param("s", $code);
/* execute statement */
$stmt->execute();
printf("rows inserted: %d\n", $stmt->affected_rows);
/* close statement */
$stmt->close();
}
/* close connection */
$mysqli->close();
?>
]]>
</programlisting>
</example>
<example>
<title>Procedural style</title>
<programlisting role="php">
<![CDATA[
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* create temp table */
mysqli_query($link, "CREATE TEMPORARY TABLE myCountry LIKE Country");
$query = "INSERT INTO myCountry SELECT * FROM Country WHERE Code LIKE ?";
/* prepare statement */
if ($stmt = mysqli_prepare($link, $query)) {
/* Bind variable for placeholder */
$code = 'A%';
mysqli_stmt_bind_param($stmt, "s", $code);
/* execute statement */
mysqli_stmt_execute($stmt);
printf("rows inserted: %d\n", mysqli_stmt_affected_rows($stmt));
/* close statement */
mysqli_stmt_close($stmt);
}
/* close connection */
mysqli_close($link);
?>
]]>
</programlisting>
</example>
&example.outputs;
<screen>
<![CDATA[
rows inserted: 17
]]>
</screen>
</refsect1>
</refentry>
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