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int PDOStatement::rowCount ( void )

<?php
/* Delete all rows from the FRUIT table */
$del = $dbh->prepare('DELETE FROM fruit');
$del->execute();

/* Return the number of deleted rows */
print("Return number of rows that were deleted:\n");
$count = $del->rowCount();
print("Deleted $count rows.\n");
?>

Return number of rows that were deleted:
Deleted 9 rows.

<?php
$sql = "SELECT COUNT(*) FROM fruit WHERE calories > 100";
if ($res = $conn->query($sql)) {

    /* Check the number of rows that match the SELECT statement */
    if ($res->fetchColumn() > 0) {

        /* Issue a real SELECT statement and process the results */
        $sql = "SELECT name FROM fruit WHERE calories > 100";
        foreach ($conn->query($sql) as $row) {
            print "Name: " . $row['NAME'] . "\n";
        }
    }
    /* No matching rows -- do something else */
    else {
        print "No rows matched the query.";
    }
}

$res = null;
$conn = null;
?>

apple
banana
orange
pear