PDOStatement::fetchColumn
(PHP 5 >= 5.1.0, PHP 7, PHP 8, PECL pdo >= 0.9.0)
PDOStatement::fetchColumn — Returns a single column from the next row of a result set
Beschreibung
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
falsefrom there being no more rows to retrieve. Use PDOStatement::fetch() instead.
Parameter-Liste
-
column -
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.
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() - Prepares and executes an SQL statement without placeholders
- PDOStatement::fetch() - Fetches the next row from a result set
- PDOStatement::fetchAll() - Fetches the remaining rows from a result set
- PDO::prepare() - Prepares a statement for execution and returns a statement object
- PDOStatement::setFetchMode() - Set the default fetch mode for this statement
