Podręcznik PHP
PoprzedniNastępny

PDOStatement::fetchColumn

(no version information, might be only in CVS)

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

Opis

string PDOStatement::fetchColumn ( [int column_number] )

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

Parametry

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.

Zwracane wartości

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

Ostrzeżenie

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

Przykłady

Przykład 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");
?>

Powyższy przykład wyświetli:

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

Patrz także

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

PoprzedniSpis treściNastępny
PDOStatement::fetchAllPoczątek rozdziałuPDOStatement::fetchObject