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https://github.com/sigmasternchen/php-doc-en
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Note: getColumnMeta is not stable; the warning was intentionally left there. git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@195768 c90b9560-bf6c-de11-be94-00142212c4b1
143 lines
4 KiB
XML
143 lines
4 KiB
XML
<?xml version='1.0' encoding='iso-8859-1'?>
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<!-- $Revision: 1.9 $ -->
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<!-- Generated by xml_proto.php v2.1. Found in /scripts directory of phpdoc. -->
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<refentry id="function.PDOStatement-rowCount">
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<refnamediv>
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<refname>PDOStatement::rowCount</refname>
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<refpurpose>
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Returns the number of rows affected by the last SQL statement
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</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>int</type><methodname>PDOStatement::rowCount</methodname>
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<void/>
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</methodsynopsis>
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<para>
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<function>PDOStatement::rowCount</function> returns the number of
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rows affected by the last DELETE, INSERT, or UPDATE statement
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executed by the corresponding <literal>PDOStatement</literal> object.
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</para>
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<para>
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If the last SQL statement executed by the associated
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<literal>PDOStatement</literal> was a SELECT statement, some databases
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may return the number of rows returned by that statement. However, this
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behaviour is not guaranteed for all databases and should not be relied
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on for portable applications.
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title>Return the number of deleted rows</title>
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<para>
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<function>PDOStatement::rowCount</function> returns the number of
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rows affected by a DELETE, INSERT, or UPDATE statement.
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</para>
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<programlisting role="php">
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<![CDATA[
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<?php
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/* Delete all rows from the FRUIT table */
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$del = $dbh->prepare('DELETE FROM fruit');
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$del->execute();
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/* Return number of rows that were deleted */
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print("Return number of rows that were deleted:\n");
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$count = $del->rowCount();
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print("Deleted $count rows.\n");
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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Deleted 9 rows.
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]]>
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</screen>
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</example>
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<example>
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<title>Counting rows returned by a SELECT statement</title>
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<para>
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For most databases, <function>PDOStatement::rowCount</function> does not
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return the number of rows affected by a SELECT statement. Instead, use
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<function>PDO::query</function> to issue a SELECT COUNT(*) statement
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with the same predicates as your intended SELECT statement, then use
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<function>PDOStatement::fetchColumn</function> to retrieve the number
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of rows that will be returned. Your application can then perform the
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correct action.
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</para>
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<programlisting role="php">
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<![CDATA[
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<?php
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$sql = "SELECT COUNT(*) FROM fruit WHERE calories > 100";
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if ($res = $conn->query($sql)) {
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/* Check the number of rows that match the SELECT statement */
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if ($res->fetchColumn() > 0) {
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/* Issue the real SELECT statement and work with the results */
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$sql = "SELECT name FROM fruit WHERE calories > 100";
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foreach ($conn->query($sql) as $row) {
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print "Name: " . $row['NAME'] . "\n";
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}
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}
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/* No rows matched -- do something else */
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else {
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print "No rows matched the query.";
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}
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}
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$res = null;
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$conn = null;
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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apple
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banana
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orange
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pear
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]]>
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</screen>
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</example>
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</para>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><function>PDOStatement::columnCount</function></member>
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<member><function>PDOStatement::fetchColumn</function></member>
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<member><function>PDOStatement::query</function></member>
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</simplelist>
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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