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<refentry xml:id="function.mysqli-affected-rows" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>mysqli_affected_rows</refname>
  <refname>mysqli->affected_rows</refname>
  <refpurpose>Gets the number of affected rows in a previous MySQL operation</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <para>Procedural style:</para>
  <methodsynopsis>
   <type>int</type><methodname>mysqli_affected_rows</methodname>
   <methodparam><type>mysqli</type><parameter>link</parameter></methodparam>
  </methodsynopsis>
  <para>Object oriented style (property):</para>
  <classsynopsis>
   <ooclass><classname>mysqli</classname></ooclass>
   <fieldsynopsis><type>int</type><varname>affected_rows</varname></fieldsynopsis>
  </classsynopsis>
  <para>
   Returns the number of rows affected by the last <literal>INSERT</literal>,
   <literal>UPDATE</literal>, <literal>REPLACE</literal> or 
   <literal>DELETE</literal> query.
  </para>
  <para>
   For SELECT statements <function>mysqli_affected_rows</function> works like
   <function>mysqli_num_rows</function>.
  </para>
 </refsect1>
 
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    &mysqli.link.description;
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &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 statement, no
   rows matched the <literal>WHERE</literal> clause in the query or that no
   query has yet been executed. -1 indicates that the query returned an
   error.
  </para>
  <note>
   <para>
    If the number of affected rows is greater than maximal int value, the
    number of affected rows will be returned as a string.
   </para>
  </note>
 </refsect1>

 <refsect1 role="examples">
  &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();
}

/* Insert rows */
$mysqli->query("CREATE TABLE Language SELECT * from CountryLanguage");
printf("Affected rows (INSERT): %d\n", $mysqli->affected_rows);

$mysqli->query("ALTER TABLE Language ADD Status int default 0");

/* update rows */
$mysqli->query("UPDATE Language SET Status=1 WHERE Percentage > 50");
printf("Affected rows (UPDATE): %d\n", $mysqli->affected_rows);

/* delete rows */
$mysqli->query("DELETE FROM Language WHERE Percentage < 50");
printf("Affected rows (DELETE): %d\n", $mysqli->affected_rows);

/* select all rows */
$result = $mysqli->query("SELECT CountryCode FROM Language");
printf("Affected rows (SELECT): %d\n", $mysqli->affected_rows);

$result->close();

/* Delete table Language */
$mysqli->query("DROP TABLE Language");

/* 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");

if (!$link) {
    printf("Can't connect to localhost. Error: %s\n", mysqli_connect_error());
    exit();
}

/* Insert rows */
mysqli_query($link, "CREATE TABLE Language SELECT * from CountryLanguage");
printf("Affected rows (INSERT): %d\n", mysqli_affected_rows($link));

mysqli_query($link, "ALTER TABLE Language ADD Status int default 0");

/* update rows */
mysqli_query($link, "UPDATE Language SET Status=1 WHERE Percentage > 50");
printf("Affected rows (UPDATE): %d\n", mysqli_affected_rows($link));

/* delete rows */
mysqli_query($link, "DELETE FROM Language WHERE Percentage < 50");
printf("Affected rows (DELETE): %d\n", mysqli_affected_rows($link));

/* select all rows */
$result = mysqli_query($link, "SELECT CountryCode FROM Language");
printf("Affected rows (SELECT): %d\n", mysqli_affected_rows($link));

mysqli_free_result($result);

/* Delete table Language */
mysqli_query($link, "DROP TABLE Language");

/* close connection */
mysqli_close($link);
?>
]]>
   </programlisting>
  </example>
  &example.outputs;
  <screen>
<![CDATA[
Affected rows (INSERT): 984
Affected rows (UPDATE): 168
Affected rows (DELETE): 815
Affected rows (SELECT): 169
]]>
  </screen>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>mysqli_num_rows</function></member>
    <member><function>mysqli_info</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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