PDOStatement::fetchColumn

(PHP 5 >= 5.1.0, PHP 7, PECL pdo >= 0.9.0)

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

Descrierea

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

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

Notă:

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.

Parametri

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.

Valorile întoarse

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

Avertizare

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

Exemple

Example #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");
?>

Exemplul de mai sus va afișa:

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

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