PDOStatement::fetchColumn

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

Beschreibung

public mixed PDOStatement::fetchColumn ([ int $column_number = 0 ] )

Returns a single column from the next row of a result set or FALSE if there are no more rows.

Hinweis:
PDOStatement::fetchColumn should not be used to retrieve boolean columns, as it is impossible to distinguish a value of FALSE from there being no more rows to retrieve. Use PDOStatement::fetch instead.

Parameter-Liste

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.

Rückgabewerte

PDOStatement::fetchColumn returns a single column from the next row of a result set or FALSE if there are no more rows.

Warnung

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

Beispiele

Beispiel #1 Return first column of the next row


<?php
$sth = $dbh->prepare("SELECT name, colour FROM fruit");
$sth->execute();

print("Fetch the first column from the first row in the result set:\n");
$result = $sth->fetchColumn();
print("name = $result\n");

print("Fetch the second column from the second row in the result set:\n");
$result = $sth->fetchColumn(1);
print("colour = $result\n");
?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

Fetch the first column from the first row in the result set:
name = lemon
Fetch the second column from the second row in the result set:
colour = red

Siehe auch

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