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<?xml version='1.0' encoding='iso-8859-1'?>
<!-- $Revision: 1.4 $ -->
<!-- Generated by xml_proto.php v2.1. Found in /scripts directory of phpdoc. -->
<refentry id="function.PDOStatement-bindColumn">
<refnamediv>
<refname>PDOStatement::bindColumn</refname>
<refpurpose>
Bind a column to a PHP variable
</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>PDOStatement::bindColumn</methodname>
<methodparam><type>mixed</type><parameter>column</parameter></methodparam>
<methodparam><type>mixed</type><parameter role="reference">param</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>type</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>maxlen</parameter></methodparam>
<methodparam choice="opt"><type>mixed</type><parameter>driver_options</parameter></methodparam>
</methodsynopsis>
&warn.experimental.func;
<para>
On each row fetch <parameter>param</parameter> will contain the value of
the corresponding column. <parameter>column</parameter> is the 1-based
offset of the column, or the column name. For maximum portability, do not
call this function before calling
<function>PDOStatement::execute</function>.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>column</parameter></term>
<listitem>
<para>
Number of the column (1-indexed) in the result set.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>param</parameter></term>
<listitem>
<para>
Name of the PHP variable to which the column will be bound.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>type</parameter></term>
<listitem>
<para>
Data type of the parameter, specified by the PDO_PARAM_* constants.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>maxlen</parameter></term>
<listitem>
<para>
Maximum length of the parameter.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>driver_options</parameter></term>
<listitem>
<para>
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title>Binding result set output to PHP variables</title>
<para>
Binding columns in the result set to PHP variables is an effective
way to make the data contained in each row immediately available to
your application. The following example demonstrates how PDO allows
you to bind and retrieve columns with a variety of options and with
intelligent defaults.
</para>
<programlisting role="php">
<![CDATA[
<?php
function readData($dbh) {
$sql = 'SELECT name, colour, calories FROM fruit';
try {
$stmt = $dbh->prepare($sql);
$stmt->execute();
/* Bind by column number with an explicit data type & length */
$stmt->bindColumn(1, $name, PDO_PARAM_STR, 64);
/* Bind by column number with default data type & length */
$stmt->bindColumn(2, $colour);
/* Bind by column name with default data type & length */
$stmt->bindColumn('CALORIES', $cals);
while ($row = $stmt->fetch(PDO_FETCH_BOUND)) {
$data = $name . "\t" . $colour . "\t" . $cals . "\n";
print $data;
}
}
catch (PDOException $e) {
print $e->getMessage();
}
}
readData($dbh);
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
apple red 150
banana yellow 175
kiwi green 75
orange orange 150
mango red 200
strawberry red 25
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>PDOStatement::execute</function></member>
<member><function>PDOStatement::fetch</function></member>
<member><function>PDOStatement::fetchAll</function></member>
<member><function>PDOStatement::fetchSingle</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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