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
}
?>
PDOStatement->setFetchMode
(PHP 5 >= 5.1.0, PHP 7, PECL pdo >= 0.2.0)
PDOStatement->setFetchMode — Deyim için öntanımlı veri alım kipini belirler
Açıklama
PDOStatement::setFetchMode
( int
$kip
) : bool
PDOStatement::setFetchMode
( int
$PDO::FETCH_COLUMN
, int $sütunnum
) : bool
PDOStatement::setFetchMode
( int
$PDO::FETCH_CLASS
, string $sınıfadı
, array $değiştirgeler
) : bool
PDOStatement::setFetchMode
( int
$PDO::FETCH_INTO
, object $nesne
) : boolDeğiştirgeler
-
kip -
PDO::FETCH_*sabitlerinden biri olarak veri alım kipi. -
sütunnum -
Sütun numarası.
-
sınıfadı -
Sınıf adı.
-
değiştirgeler -
Kurucu değiştirgeleri.
-
nesne -
Nesne.
Dönen Değerler
Başarı durumunda 1 aksi takdirde false.
Örnekler
Örnek 1 - Veri alım kipinin belirlenmesi
Aşağıdaki örnekte bir PDOStatement nesnesinin veri alım kipinin PDOStatement::setFetchMode() ile nasıl değiştirileceği gösterilmiştir.
<?php
$sql = 'SELECT isim, renk, kalori FROM meyveler';
try {
$stmt = $dbh->query($sql);
$result = $stmt->setFetchMode(PDO::FETCH_NUM);
while ($col = $stmt->fetch()) {
print $col[0] . "\t" . $col[1] . "\t" . $col[2] . "\n";
}
}
catch (PDOException $e) {
print $e->getMessage();
}
?>
Yukarıdaki örneğin çıktısı:
elma kırmızı 150 muz sarı 250 portakal turuncu 300 kivi kahverengi 75 limon sarı 25 armut yeşil 150 ahududu mor 90
add a note
User Contributed Notes 5 notes
Dormilich at netscape dot net ¶
10 years ago
Kats ¶
3 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);
?>
stein_AT_rhrk.uni-kl.de ¶
13 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`.
matt at kynx dot org ¶
15 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
?>
Dariusz Kielar ¶
15 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.
