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PDOStatement->bindColumn()
Bind a column to a PHP variable
()
PDOStatement {
bool bindColumn(mixed column,
mixed param,
int type);
}PDOStatement->bindColumn() 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.
Since information about the columns is not always available to PDO until the statement is executed, portable applications should call this function after PDOStatement->execute().
Parameters
- column
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.
- param
Name of the PHP variable to which the column will be bound.
- type
Data type of the parameter, specified by the PDO::PARAM_* constants.
Examples
Example 1770. Binding result set output to PHP variables
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.
<?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