mirror of
https://github.com/sigmasternchen/php-doc-en
synced 2025-03-27 14:28:56 +00:00
8dd919817d
Add new parameter to PDOStatement::fetchColumn. git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@186675 c90b9560-bf6c-de11-be94-00142212c4b1
144 lines
4 KiB
XML
144 lines
4 KiB
XML
<?xml version='1.0' encoding='iso-8859-1'?>
|
|
<!-- $Revision: 1.7 $ -->
|
|
<!-- Generated by xml_proto.php v2.1. Found in /scripts directory of phpdoc. -->
|
|
<refentry id="function.PDOStatement-rowCount">
|
|
<refnamediv>
|
|
<refname>PDOStatement::rowCount</refname>
|
|
<refpurpose>
|
|
Returns the number of rows affected by the last SQL statement
|
|
</refpurpose>
|
|
</refnamediv>
|
|
<refsect1 role="description">
|
|
&reftitle.description;
|
|
<methodsynopsis>
|
|
<type>int</type><methodname>PDOStatement::rowCount</methodname>
|
|
<void/>
|
|
</methodsynopsis>
|
|
|
|
&warn.experimental.func;
|
|
<para>
|
|
<function>PDOStatement::rowCount</function> returns the number of
|
|
rows affected by the last DELETE, INSERT, or UPDATE statement
|
|
executed by the corresponding <literal>PDOStatement</literal> object.
|
|
</para>
|
|
<para>
|
|
If the last SQL statement executed by the associated
|
|
<literal>PDOStatement</literal> was a SELECT statement, some databases
|
|
may return the number of rows returned by that statement. However, this
|
|
behaviour is not guaranteed for all databases and should not be relied
|
|
on for portable applications.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 role="examples">
|
|
&reftitle.examples;
|
|
<para>
|
|
<example>
|
|
<title>Return the number of deleted rows</title>
|
|
<para>
|
|
<function>PDOStatement::rowCount</function> returns the number of
|
|
rows affected by a DELETE, INSERT, or UPDATE statement.
|
|
</para>
|
|
<programlisting role="php">
|
|
<![CDATA[
|
|
<?php
|
|
/* Delete all rows from the FRUIT table */
|
|
$del = $dbh->prepare('DELETE FROM fruit');
|
|
$del->execute();
|
|
|
|
/* Return number of rows that were deleted */
|
|
print("Return number of rows that were deleted:\n");
|
|
$count = $del->rowCount();
|
|
print("Deleted $count rows.\n");
|
|
?>
|
|
]]>
|
|
</programlisting>
|
|
&example.outputs;
|
|
<screen>
|
|
<![CDATA[
|
|
Deleted 9 rows.
|
|
]]>
|
|
</screen>
|
|
</example>
|
|
<example>
|
|
<title>Counting rows returned by a SELECT statement</title>
|
|
<para>
|
|
For most databases, <function>PDOStatement::rowCount</function> does not
|
|
return the number of rows affected by a SELECT statement. Instead, use
|
|
<function>PDO::query</function> to issue a SELECT COUNT(*) statement
|
|
with the same predicates as your intended SELECT statement, then use
|
|
<function>PDOStatement::fetchColumn</function> to retrieve the number
|
|
of rows that will be returned. Your application can then perform the
|
|
correct action.
|
|
</para>
|
|
<programlisting role="php">
|
|
<![CDATA[
|
|
<?php
|
|
$sql = "SELECT COUNT(*) FROM fruit WHERE calories > 100";
|
|
if ($res = $conn->query($sql)) {
|
|
|
|
// Check the number of rows that match the SELECT statement
|
|
if ($res->fetchColumn() > 0) {
|
|
|
|
// Issue the real SELECT statement and work with the results
|
|
$sql = "SELECT name FROM fruit WHERE calories > 100";
|
|
foreach ($conn->query($sql) as $row) {
|
|
print "Name: " . $row['NAME'] . "\n";
|
|
}
|
|
}
|
|
// No rows matched -- do something else
|
|
else {
|
|
print "No rows matched the query.";
|
|
}
|
|
}
|
|
|
|
$res = null;
|
|
$conn = null;
|
|
?>
|
|
]]>
|
|
</programlisting>
|
|
&example.outputs;
|
|
<screen>
|
|
<![CDATA[
|
|
apple
|
|
banana
|
|
orange
|
|
pear
|
|
]]>
|
|
</screen>
|
|
</example>
|
|
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 role="seealso">
|
|
&reftitle.seealso;
|
|
<para>
|
|
<simplelist>
|
|
<member><function>PDOStatement::columnCount</function></member>
|
|
<member><function>PDOStatement::fetchColumn</function></member>
|
|
<member><function>PDOStatement::query</function></member>
|
|
</simplelist>
|
|
</para>
|
|
|
|
</refsect1>
|
|
</refentry>
|
|
|
|
<!-- 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
|
|
indent-tabs-mode:nil
|
|
sgml-parent-document:nil
|
|
sgml-default-dtd-file:"../../../../manual.ced"
|
|
sgml-exposed-tags:nil
|
|
sgml-local-catalogs:nil
|
|
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
|
|
-->
|