PDOStatement::rowCount
(PHP 5 >= 5.1.0, PHP 7, PHP 8, PECL pdo >= 0.1.0)
PDOStatement::rowCount — Returns the number of rows affected by the last SQL statement
Beschreibung
PDOStatement::rowCount() returns the number of
rows affected by the last DELETE, INSERT, or UPDATE statement
executed by the corresponding PDOStatement object.
If the last SQL statement executed by the associated
PDOStatement was a SELECT statement, some databases
may return the number of rows returned by that statement. However, this
behaviour is not guaranteed for all databases and should not be relied
on for portable applications.
Hinweis:
This method returns "0" (zero) with the SQLite driver at all times, and with the PostgreSQL driver only when setting the
PDO::ATTR_CURSORstatement attribute toPDO::CURSOR_SCROLL.
Parameter-Liste
Diese Funktion besitzt keine Parameter.
Rückgabewerte
Returns the number of rows.
Beispiele
Beispiel #1 Return the number of deleted rows
PDOStatement::rowCount() returns the number of rows affected by a DELETE, INSERT, or UPDATE statement.
<?php
/* Delete all rows from the FRUIT table */
$del = $dbh->prepare('DELETE FROM fruit');
$del->execute();
/* Return number of rows that were deleted */
print("Return number of rows that were deleted:\n");
$count = $del->rowCount();
print("Deleted $count rows.\n");
?>
Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:
Return number of rows that were deleted: Deleted 9 rows.
Beispiel #2 Counting rows returned by a SELECT statement
For most databases, PDOStatement::rowCount() does not return the number of rows affected by a SELECT statement. Instead, use PDO::query() to issue a SELECT COUNT(*) statement with the same predicates as your intended SELECT statement, then use PDOStatement::fetchColumn() to retrieve the number of matching rows.
<?php
$sql = "SELECT COUNT(*) FROM fruit WHERE calories > 100";
$res = $conn->query($sql);
$count = $res->fetchColumn();
print "There are " . $count . " matching records.";
Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:
There are 2 matching records.
Siehe auch
- PDOStatement::columnCount() - Returns the number of columns in the result set
- PDOStatement::fetchColumn() - Returns a single column from the next row of a result set
- PDO::query() - Prepares and executes an SQL statement without placeholders
