PHP 手册
后退前进


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()


add a note add a note User Contributed Notes
There are no user contributed notes for this page.


后退起点前进
PDOStatement::fetchAll上一级PDOStatement::getAttribute