PHP 5.6.0beta1 released

PDOStatement::setFetchMode

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

PDOStatement::setFetchMode Définit le mode de récupération par défaut pour cette requête

Description

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

Liste de paramètres

mode

Le mode de récupération doit être une des constantes PDO::FETCH_*.

colno

Numéro de la colonne.

classname

Nom de la classe.

ctorargs

Arguments du constructeur.

object

Objet.

Valeurs de retour

Cette fonction retourne TRUE en cas de succès ou FALSE si une erreur survient.

Exemples

Exemple #1 Définition du mode de récupération

L'exemple suivant montre comment PDOStatement::setFetchMode() modifie le mode de récupération par défaut pour un objet PDOStatement.

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

L'exemple ci-dessus va afficher :

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 4 notes

up
7
Dormilich at netscape dot net
3 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
2
stein_AT_rhrk.uni-kl.de
6 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`.
up
1
Dariusz Kielar
8 years ago
PDO::FETCH_CLASS may be used only with this method and it takes up to three parameters then:
 - int mode
 - string className
 - array constructorArgs (optional)

<?php
$stmt
= $pdo -> query('your query');
$stmt -> setFetchMode(PDO::FETCH_CLASS, 'yourClass', array(0 => false));

while(
$row = $stmt -> fetch())
{
  
// $row is an object of "yourClass" class
}
$stmt -> closeCursor();
?>

Note also that the constructor is called AFTER the data is set on the object.
up
0
matt at kynx dot org
8 years ago
To fetch the rows into an existing instance of a class, use PDO::FETCH_INTO and pass the object as the second parameter.

The class _must_ have the column names declared as public members, or the script will die. But overloading with __set() and __get() lets it handle any column your query throws at it. 

Set the fetch mode right after you call prepare(). It appears you _must_ use execute() - fetch() won't work. A small example, adapted from ext/pdo/tests/pdo_025.phpt:

<?php
class Test
{
    protected
$cols;
   
    function
__set($name, $value) {
       
$this->cols[$name] = $value;
    }
   
    function
__get($name) {
        return
$this->cols[$name];
    }
}

$obj = new Test();
$db = PDOTest::factory();
$stmt = $db->prepare("select * from test");
$stmt->setFetchMode(PDO::FETCH_INTO, $obj);
$stmt->execute();

foreach (
$stmt as $a) {
   
print_r($a);
}

print_r($obj); // contains the same values as the last iteration above
?>
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