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rowcount.xml
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rowcount.xml
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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="pdostatement.rowcount" xmlns="http://docbook.org/ns/docbook">
<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>
<modifier>public</modifier> <type>int</type><methodname>PDOStatement::rowCount</methodname>
<void/>
</methodsynopsis>
<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>
<note>
<para>
This method returns "0" (zero) with the SQLite driver at all times,
and with the PostgreSQL driver only when setting the
<constant>PDO::ATTR_CURSOR</constant> statement attribute to
<constant>PDO::CURSOR_SCROLL</constant>.
</para>
</note>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
&no.function.parameters;
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns the number of rows.
</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.similar;
<screen>
<![CDATA[
Return number of rows that were deleted:
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 matching rows.
</para>
<programlisting role="php">
<![CDATA[
<?php
$sql = "SELECT COUNT(*) FROM fruit WHERE calories > 100";
$res = $conn->query($sql);
$count = $res->fetchColumn();
print "There are " . $count . " matching records.";
]]>
</programlisting>
&example.outputs.similar;
<screen>
<![CDATA[
There are 2 matching records.
]]>
</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>PDO::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:"~/.phpdoc/manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
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vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->