PDOStatement::setFetchMode

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

PDOStatement::setFetchMode Set the default fetch mode for this statement

Descrição

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 )

Parâmetros

mode

The fetch mode must be one of the PDO::FETCH_* constants.

colno

Column number.

classname

Class name.

ctorargs

Constructor arguments.

object

Object.

Valor Retornado

Retorna TRUE em caso de sucesso ou FALSE em caso de falha.

Exemplos

Exemplo #1 Setting the fetch mode

The following example demonstrates how PDOStatement::setFetchMode() changes the default fetch mode for a PDOStatement object.

<?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();
}
?>

O exemplo acima irá imprimir:

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
4 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
1
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
0
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
-1
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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