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<?xml version='1.0' encoding='iso-8859-1'?>
<!-- $Revision: 1.8 $ -->
<!-- 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>
</methodsynopsis>
<para>
<function>PDOStatement::bindColumn</function> arranges to have a
particular variable bound to a given column in the result-set from a
query. Each call to <function>PDOStatement::fetch</function> or
<function>PDOStatement::fetchAll</function> will update all the variables
that are bound to columns.
</para>
<note>
<para>
Since information about the columns is not always available to PDO until
the statement is executed, portable applications should call this
function <emphasis>after</emphasis> <function>PDO::execute</function>.
</para>
</note>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>column</parameter></term>
<listitem>
<para>
Number of the column (1-indexed) or name of the column in the result set.
If using the column name, be aware that the name should match the
case of the column, as returned by the driver.
</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>
</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 */
$stmt->bindColumn(1, $name);
$stmt->bindColumn(2, $colour);
/* Bind by column name */
$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::fetchColumn</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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