<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="pdostatement.fetchcolumn" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>PDOStatement::fetchColumn</refname>
  <refpurpose>
   Returns a single column from the next row of a result set
  </refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis role="PDOStatement">
   <modifier>public</modifier> <type>mixed</type><methodname>PDOStatement::fetchColumn</methodname>
   <methodparam choice="opt"><type>int</type><parameter>column</parameter><initializer>0</initializer></methodparam>
  </methodsynopsis>

  <para>
   Returns a single column from the next row of a result set or &false; if
   there are no more rows.
  </para>

  <note>
   <para>
    <methodname>PDOStatement::fetchColumn</methodname> should not be used to
    retrieve boolean columns, as it is impossible to distinguish a value of
    &false; from there being no more rows to retrieve. Use
    <methodname>PDOStatement::fetch</methodname> instead.
   </para>
  </note>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>column</parameter></term>
     <listitem>
      <para>
       0-indexed number of the column you wish to retrieve from the row. If
       no value is supplied, <methodname>PDOStatement::fetchColumn</methodname>
       fetches the first column.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   <methodname>PDOStatement::fetchColumn</methodname> returns a single column
   from the next row of a result set or &false; if there are no more rows.
  </para>
  <warning>
   <para>
    There is no way to return another column from the same row if you
    use <methodname>PDOStatement::fetchColumn</methodname> to retrieve data.
   </para>
  </warning>
 </refsect1>

 <refsect1 role="errors">
  &reftitle.errors;
  &pdo.errors;
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example><title>Return first column of the next row</title>
    <programlisting role="php">
<![CDATA[
<?php
$sth = $dbh->prepare("SELECT name, colour FROM fruit");
$sth->execute();

print "Fetch the first column from the first row in the result set:\n";
$result = $sth->fetchColumn();
print "name = $result\n";

print "Fetch the second column from the second row in the result set:\n";
$result = $sth->fetchColumn(1);
print "colour = $result\n";
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Fetch the first column from the first row in the result set:
name = lemon
Fetch the second column from the second row in the result set:
colour = red
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><methodname>PDO::query</methodname></member>
    <member><methodname>PDOStatement::fetch</methodname></member>
    <member><methodname>PDOStatement::fetchAll</methodname></member>
    <member><methodname>PDO::prepare</methodname></member>
    <member><methodname>PDOStatement::setFetchMode</methodname></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:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->
