PDOStatement::setFetchMode

    (PHP 5 >= 5.1.0, PHP 7, PHP 8, PECL pdo >= 0.2.0)

    PDOStatement::setFetchMode — Legt den standardmäßigen Abrufmodus eine Anweisung fest

    Beschreibung

    public PDOStatement::setFetchMode(int $mode): bool
    public PDOStatement::setFetchMode(int $mode = PDO::FETCH_COLUMN, int $colno): bool
    public PDOStatement::setFetchMode(int $mode = PDO::FETCH_CLASS, string $class, ?array $constructorArgs = null): bool
    public PDOStatement::setFetchMode(int $mode = PDO::FETCH_INTO, object $object): bool

    Parameter-Liste

    mode

    Der Abrufmodus muss eine der PDO::FETCH_*-Konstanten sein.

    colno

    Die Nummer der Spalte

    class

    Der Name der Klasse

    constructorArgs

    Konstruktorargumente

    object

    Das Objekt

    Rückgabewerte

    Gibt bei Erfolg true zurück. Bei einem Fehler wird false zurückgegeben.

    Beispiele

    Beispiel #1 Festlegen des Abrufmodus

    Das folgende Beispiel zeigt, wie PDOStatement::setFetchMode() den standardmäßigen Abrufmodus für ein PDOStatement-Objekt ändert.

    <?php
    $stmt     = $dbh->query('SELECT name, colour, calories FROM fruit');
    $stmt->setFetchMode(PDO::FETCH_NUM);
    foreach (    $stmt as $row) {
    print     $row[0] . "\t" . $row[1] . "\t" . $row[2] . "\n";
    }

    Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

    apple   red     150
banana  yellow  250
orange  orange  300
kiwi    brown   75
lemon   yellow  25
pear    green   150

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    User Contributed Notes 3 notes

    up
    35
    Dormilich at netscape dot net
    14 years ago
    if you want to fetch your result into a class (by using PDO::FETCH_CLASS) and want the constructor to be executed *before* PDO assings the object properties, you need to use the PDO::FETCH_PROPS_LATE constant:

    <?php
    $stmt     = $pdo->prepare("your query");

    $stmt->setFetchMode(PDO::FETCH_CLASS|PDO::FETCH_PROPS_LATE, "className", $constructorArguments);

    # pass parameters, if required by the query
    $stmt->execute($parameters);

    foreach (    $stmt as $row)
    {
    // do something with (each of) your object
    }
    ?>
    up
    9
    Kats
    7 years ago
    Something very helpful is knowing how to access namespaces from the function. It took me a minute (and Google) to figure out. The ::class property is going to be your best friend in this case.

    <?php
    $stmt    ->setFetchMode(PDO::FETCH_CLASS, Name\Space\Class::class);
    ?>
    up
    2
    stein_AT_rhrk.uni-kl.de
    17 years ago
    Some note on PDO :: FETCH_CLASS | PDO :: FETCH_CLASSTYPE

    It took me some time, to realize, that you can not use this fetch-mode in $stm->setFetchMode(), when you want to retrieve objects from the database whereas the type is defined by the first column in the resultset.
    You have to define this mode directly in the $stm->fetch() method.

    To make it clearer:

    $stm = $pdo->query("SELECT * FROM `foo`);
    $stm->setFetchMode(FETCH_CLASS | PDO :: FETCH_CLASSTYPE);

    $object = $stm->fetch();

    Will not return the expected object, whereas

    $stm = $pdo->query("SELECT * FROM `foo`");

    $object = $stm->fetch(FETCH_CLASS | PDO :: FETCH_CLASSTYPE);

    will give you the object of the class, defined in the first column of `foo`.
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