PDOStatement::setFetchMode

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

    PDOStatement::setFetchMode — Establece el modo de obtención para esta sentencia

    Descripción

    public PDOStatement::setFetchMode(int $mode): bool
    public PDOStatement::setFetchMode(int $PDO::FETCH_COLUMN, int $colno): bool
    public PDOStatement::setFetchMode(int $PDO::FETCH_CLASS, string $classname, array $ctorargs): bool
    public PDOStatement::setFetchMode(int $PDO::FETCH_INTO, object $object): bool

    Parámetros

    mode

    El modo de obtención debe ser una de las constantes PDO::FETCH_*.

    colno

    El número de la columna.

    classname

    El nombre de la clase.

    ctorargs

    Los argumentos del constructor.

    object

    El objeto.

    Valores devueltos

    Devuelve true en caso de éxito o false en caso de error.

    Ejemplos

    Ejemplo #1 Establece el modo de obtención

    El siguiente ejemplo demuestra cómo PDOStatement::setFetchMode() cambia el modo de obtención predeterminado para un objeto PDOStatement.

    <?php
    $sql     = 'SELECT name, colour, calories FROM fruit';
    try {
    $sentencia = $gbd->query($sql);
    $resultado = $sentencia->setFetchMode(PDO::FETCH_NUM);
    while (    $fila = $sentencia->fetch()) {
    print     $fila[0] . "\t" . $fila[1] . "\t" . $fila[2] . "\n";
    }
    }
    catch (    PDOException $e) {
    print     $e->getMessage();
    }
    ?>

    El resultado del ejemplo sería:

    apple   red     150
banana  yellow  250
orange  orange  300
kiwi    brown   75
lemon   yellow  25
pear    green   150
watermelon      pink    90

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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
    16 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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