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# 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] )

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.

## 范例

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()

后退 | 起点 | 前进
PDOStatement::fetchAll | 上一级 | PDOStatement::getAttribute