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PDOStatement::bindColumn (no version information, might be only in CVS) PDOStatement::bindColumn --
Bind a column to a PHP variable
说明bool PDOStatement::bindColumn ( mixed column, mixed ¶m [, 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.
注:
Since information about the columns is not always available to PDO until
the statement is executed, portable applications should call this
function after PDO::execute().
参数
- 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.
范例
例子 1. 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);
?>
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上例将输出： apple red 150
banana yellow 175
kiwi green 75
orange orange 150
mango red 200
strawberry red 25 |
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参见
| PDOStatement::execute() | | PDOStatement::fetch() | | PDOStatement::fetchAll() | | PDOStatement::fetchColumn() |
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