PDOStatement
You can also set the fetch mode to FETCH_ASSOC if you do not need the column index. This reduces both the size of the resultset and is faster in some cases.
<?php
$stmt = $dbh->prepare("SELECT mykey, myvalue FROM mytable");
$stmt->setFetchMode(PDO::FETCH_ASSOC);
$arrValues = $stmt->fetchAll();
foreach ($arrValues as $row){
print $row["mykey"]." -> ".$row["myvalue"]."<br />\n";
}
?>
PDOStatement->setFetchMode
(No version information available, might be only in CVS)
PDOStatement->setFetchMode — Set the default fetch mode for this statement
Description
bool PDOStatement::setFetchMode
( int $mode
)
bool PDOStatement::setFetchMode
( int $PDO::FETCH_COLUMN
, int $colno
)
bool PDOStatement::setFetchMode
( int $PDO::FETCH_CLASS
, string $classname
, array $ctorargs
)
bool PDOStatement::setFetchMode
( int $PDO::FETCH_INTO
, object $object
)
Parameters
- mode
-
The fetch mode must be one of the PDO::FETCH_* constants.
Return Values
Returns 1 on success or FALSE on failure.
Examples
Example #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();
}
?>
The above example will output:
apple red 150 banana yellow 250 orange orange 300 kiwi brown 75 lemon yellow 25 pear green 150 watermelon pink 90
add a note
User Contributed NotesPDOStatement->setFetchMode
harlequin2 at gmx dot de
10-Jun-2008 02:22
10-Jun-2008 02:22
stein_AT_rhrk.uni-kl.de
20-Nov-2007 01:04
20-Nov-2007 01:04
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
18-Feb-2006 12:13
18-Feb-2006 12:13
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
13-Feb-2006 07:55
13-Feb-2006 07:55
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.