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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 &param [, 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

## 参见

PDOStatement::execute()
PDOStatement::fetch()
PDOStatement::fetchAll()
PDOStatement::fetchSingle()

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PDO::setAttribute | 上一级 | PDOStatement::bindParam