Question

我想循环到DB以检查变量是否存在，然后当它不存在时，我在DB中进行INSERT。例如：

$i = 1;
$string = $_POST['name'];
$req = $pdo->prepare('SELECT name FROM users WHERE name = ?');
$req->execute(array($string));
while($req->rowCount() > 0) {
    $name = $string . '-' . $i;
    // HERE IN NEED TO TEST THE EXISTENCE OF THE VAR ($name) INTO DB, BUT HOW?
    $i++
}
if ($name) {
    $string = $name;
}
$req = $pdo->prepare('INSERT INTO users (name) VALUES (?)');
$req->execute(array($string));
$req->closeCursor();

Answer 1

我终于找到了办法：

function profileLink(PDO $pdo, $string, $i=0)
{
    if ($i!=0) {
        $link = $string . '-' . $i;
    } else {
        $link = $string;
    }
    $req = $pdo->prepare('SELECT link FROM users WHERE link = ?');
    $req->execute(array($link));
    $nb = $req->rowCount();
    $req->closeCursor();
    if ($nb > 0) {
        $i++;
        return profileLink($pdo, $string, $i);
    } else {
        return $link;
    }
}
$link = profileLink($pdo, $link);

循环进入PDO请求以检查变量是否存在？

1 个答案: