PHP kézikönyv
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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

## Leírás

string PDOStatement::fetchColumn ( [int column_number] )

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

## Paraméterek

column_number

  0-indexed number of the column you wish to retrieve from the row. If no value is supplied, PDOStatement::fetchColumn() fetches the first column.

## Visszatérési értékek

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

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

## Példák

Példa 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("name = $result\n"); print("Fetch the second column from the next row in the result set:\n"); $result = $sth->fetchColumn(1); print("colour = $result\n"); ?>`
A fenti példa a következő kimenetet adja:
    Fetch the first column from the next row in the result set:
    name = lemon
    Fetch the second column from the next row in the result set:
    colour = red

## Lásd még

PDO::query()
PDOStatement::fetch()
PDOStatement::fetchAll()
PDOStatement::prepare()
PDOStatement::setFetchMode()

Előző | Tartalom | Következő
PDOStatement::fetchAll | Fel | PDOStatement::fetchObject