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 [, int maxlen [, mixed driver_options]]] )
| 警告 |
本函数是实验性的。本函数的行为，包括函数名称以及其它任何关于本函数的文档可能会在没有通知的情况下随
PHP 以后的发布而改变。使用本函数风险自担。 |
On each row fetch param will contain the value of
the corresponding column. column is the 1-based
offset of the column, or the column name. For maximum portability, do not
call this function before calling
PDOStatement::execute().
参数
- column
Number of the column (1-indexed) in the result set.
- 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.
- maxlen
Maximum length of the parameter.
- driver_options
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 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);
?>
|
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::fetchSingle() |