PDOStatement::fetchAll	PDOStatement::getAttribute

	Last updated: Mon, 16 Jul 2012

PDOStatement::fetchColumn

(no version information, might be only in CVS)

PDOStatement::fetchColumn -- Returns a single column from the next row of a result set

说明

string PDOStatement::fetchColumn ( [int column_number] )

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。

Returns a single column from the next row of a result set.

参数

column_number: Number of the column you wish to retrieve from the row. If no value is supplied, PDOStatement::fetchColumn() fetches the first column.

返回值

PDOStatement::fetchColumn() returns a single column in the next row of a result set.

警告

There is no way to return another column from the same row if you use PDOStatement::fetchColumn() to retrieve data.

例

例子 1. Return first column of the next row

<?php $sth = $dbh->prepare("SELECT name, colour FROM fruit"); $sth->execute(); /* Fetch the first column from the next row in the result set */ print("Fetch the first column from the next row in the result set:\n"); $result = $sth->fetchColumn(); print("$result\n"); $result = $sth->fetchColumn(); print("$result\n"); ?>
上例将输出：
Fetch the first column from the next row in the result set: lemon orange

参见

PDO::query()

PDOStatement::fetch()

PDOStatement::fetchAll()

PDOStatement::prepare()

PDOStatement::setFetchMode()

PDOStatement::fetchAll	PDOStatement::getAttribute

	Last updated: Mon, 16 Jul 2012


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