PDOStatement->fetchAll
This is an excellent method for returning a column count. For example:
<?php
$db = new PDO('mysql:host=localhost;dbname=pictures','user','password');
$pics = $db->query('SELECT COUNT(id) FROM pics');
$this->totalpics = $pics->fetchColumn();
$db = null;
?>
In my case $pics->fetchColumn() returns 641 because that is how many pictures I have in my db.
PDOStatement->fetchColumn
(PHP 5 >= 5.1.0, PECL pdo >= 0.9.0)
PDOStatement->fetchColumn — Returns a single column from the next row of a result set
Beschreibung
string 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.
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 in the next row of a result set.
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();
/* 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");
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
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
Siehe auch
- PDO::query() - Executes an SQL statement, returning a result set as a PDOStatement object
- PDOStatement::fetch() - Fetches the next row from a result set
- PDOStatement::fetchAll() - Returns an array containing all of the result set rows
- PDO::prepare() - Prepares a statement for execution and returns a statement object
- PDOStatement::setFetchMode() - Set the default fetch mode for this statement
add a note
User Contributed NotesPDOStatement->fetchColumn
seanferd at assmasterdonkeyranch dot com
25-Jan-2007 11:04
25-Jan-2007 11:04