PEAR Kézikönyv
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DB_common::setFetchMode()

DB_common::setFetchMode() -- Sets the default fetch mode

Áttekintés

void setFetchMode (integer $fetchmode [, string $object_class = stdClass])

Leírás

Sets the default fetch mode used by fetch*() and get*() methods.

Paraméterek

integer $fetchmode

DB_FETCHMODE_ORDERED, DB_FETCHMODE_ASSOC or DB_FETCHMODE_OBJECT.

See the Examples section, below, for more information.

string $object_class

This parameter is for use when $fetchmode is set to DB_FETCHMODE_OBJECT.

You can set this parameter to DB_row, which then causes the resulting data to populate a new instance of a DB_row object.

Visszatérési érték

void - nothing is returned on success or a DB_Error object on failure

Lehetséges hibaértékek

Táblázat 35-1. Lehetséges PEAR_Error visszatérési értékek

Error codeError messageReasonSolution
NULL invalid fetchmode mode The given fetch mode does not exists or is not implement in your DB version. Check writing of the argument and your used version of DB.

Megjegyzés

Ez a függvény nem hívható statikusan.

Példa

Példa 35-1. DB_FETCHMODE_ORDERED (default)

Causes ordered arrays to be returned. The order is taken from the select statement. 

<?php
// Once you have a valid DB object named $db...
$db->setFetchMode(DB_FETCHMODE_ORDERED);

$res =& $db->query('SELECT a, b FROM phptest WHERE a = 28');
$row =& $res->fetchRow();

print_r($row);
echo 'Column a is ' . $row[0];
?>

Output: 

Array
(
    [0] => 28
    [1] => hi
)
Column a is 28

Példa 35-2. DB_FETCHMODE_ASSOC

Makes associative arrays, with the column names as the array keys. 

<?php
// Once you have a valid DB object named $db...
$db->setFetchMode(DB_FETCHMODE_ASSOC);

$res =& $db->query('SELECT a, b FROM phptest WHERE a = 28');
$row =& $res->fetchRow();

print_r($row);
echo 'Column a is ' . $row['a'];
?>

Output: 

Array
(
    [a] => 28
    [b] => hi
)
Column a is 28

Példa 35-3. DB_FETCHMODE_OBJECT

Returns objects with column names as properties. 

<?php
// Once you have a valid DB object named $db...
$db->setFetchMode(DB_FETCHMODE_OBJECT);

$res =& $db->query('SELECT a, b FROM phptest WHERE a = 28');
$row =& $res->fetchRow();

print_r($row);
echo 'Column a is ' . $row->a;
?>

Output: 

stdClass Object
(
    [a] => 28
    [b] => hi
)
Column a is 28

Példa 35-4. DB_FETCHMODE_OBJECT and DB_row

If setFetchMode()'s optional $object_class parameter is set to DB_row, DB_row objects are returned. 

<?php
// Once you have a valid DB object named $db...
$db->setFetchMode(DB_FETCHMODE_OBJECT, 'DB_row');

$res =& $db->query('SELECT a, b FROM phptest WHERE a = 28');
$row =& $res->fetchRow();

print_r($row);
echo 'Column a is ' . $row->a;
?>

Output: 

db_row Object
(
    [a] => 28
    [b] => hi
)
Column a is 28

Példa 35-5. DB_FETCHMODE_OBJECT with your own object in PHP 4 

<?php
// Once you have a valid DB object named $db...

class SomeResult {
    function SomeResult($data) {
        foreach ($data as $key => $value) {
            $this->$key = $data[$key];
        }
    }
}

$db->setFetchMode(DB_FETCHMODE_OBJECT, 'SomeResult');

$res =& $db->query('SELECT a, b FROM phptest WHERE a = 28');
$row =& $res->fetchRow();

print_r($row);
echo 'Column a is ' . $row->a;
?>

Output: 

SomeResult Object
(
    [a] => 28
    [b] => hi
)
Column a is 28

Példa 35-6. DB_FETCHMODE_OBJECT with your own object in PHP 5 

<?php
// Once you have a valid DB object named $db...

class SomeResult {
    public $row_data;
    function __construct($data) {
        $this->row_data = $data;
    }
    function __get($variable) {
        return $this->row_data[$variable];
    }
}

$db->setFetchMode(DB_FETCHMODE_OBJECT, 'SomeResult');

$res =& $db->query('SELECT a, b FROM phptest WHERE a = 28');
$row =& $res->fetchRow();

print_r($row);
echo 'Column a is ' . $row->a;
?>

Output: 

SomeResult Object
(
    [a] => 28
    [b] => hi
)
Column a is 28
ElőzőTartalomKövetkező
DB_common::rollback()FelDB_common::setOption()