PDOStatement::bindColumn
PDOStatement::bindColumn — Bind a column to a PHP variable (PHP 5 >= 5.1.0, PECL pdo >= 0.1.0)
Description
Syntax
bool PDOStatement::bindColumn ( mixed $column , mixed &$param [, int $type [, int $maxlen [, mixed $driverdata ]]] )
Arranges to have a particular variable bound to a given column in the result-set from a query. Each call to PDOStatement::fetch() or PDOStatement::fetchAll() will update all the variables that are bound to columns.
Note: Column information is not always available to PDO until the statement is executed. Portable applications should call this method (function) after PDOStatement::execute().
Parameters
column
param
type
maxlen
driverdata
Return Value
Returns TRUE on success or FALSE on failure.
Examples
Binding result set output to PHP variables
Binding columns in the result set to PHP variables is an effective way to make the data from each row immediately available in the application. The following example demonstrates how PDO can bind and retrieve columns with various options and default values.
<?php
function readData($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);
?>
The above example will output:
apple red 150
banana yellow 175
kiwi green 75
orange orange 150
mango red 200
strawberry red 25