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PDOStatement->fetchAll> <PDOStatement->execute
[edit] Last updated: Fri, 07 Jun 2013

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PDOStatement->fetch

(PHP 5 >= 5.1.0, PECL pdo >= 0.1.0)

PDOStatement->fetchSonuç kümesindeki sonraki satırı döndürür

Açıklama

mixed PDOStatement::fetch ([ int $alım_tarzı = PDO::FETCH_BOTH [, int $göst_yönü = PDO::FETCH_ORI_NEXT [, int $göst_başlangıcı = 0 ]]] )

PDOStatement nesnesi ile ilişkili sonuç kümesinden bir sonraki satırı döndürür. alım_tarzı değiştirgesi ile PDO'nun satırı nasıl döndüreceği belirtilir.

Değiştirgeler

alım_tarzı

Sonrakı satırın nasıl döndürüleceğini belirtmek için kullanılır. PDO::FETCH_* sabitlerinden biri olmalıdır. PDO::FETCH_BOTH öntanımlı değerdir.

  • PDO::FETCH_ASSOC: Sütun isimlerine göre indisli bir dizi döner.

  • PDO::FETCH_BOTH (öntanımlı): Hem sütun isimlerine hem de sütun numaralarına göre indislenmiş bir dizi döner. İlk sütunun indisi 0'dır.

  • PDO::FETCH_BOUND: Sütun değerlerini PDOStatement::bindColumn() ile ilişkilendirilmiş PHP değişkenlerine atar ve TRUE döndürür.

  • PDO::FETCH_CLASS: İstenen sınıfın özelliklerini sütun isimlerine eşleyerek sınıfın bir örneğini döndürür. Eğer alım_tarzı değiştirgesi PDO::FETCH_CLASSTYPE sabitini içeriyorsa (örn, PDO::FETCH_CLASS | PDO::FETCH_CLASSTYPE) sınıf ismi ilk sütunun değerine göre belirlenir.

  • PDO::FETCH_INTO: İstenen sınıfın mevcut örneğini sütun isimlerini sınıf özelliklerine eşleyerek günceller.

  • PDO::FETCH_LAZY: PDO::FETCH_BOTH ve PDO::FETCH_OBJ sabitlerinin birleşimidir.

  • PDO::FETCH_NUM: Sütun numaralarına göre indislenmiş bir dizi döner. İlk sütunun indisi 0'dır.

  • PDO::FETCH_OBJ: Özellik isimlerinin sınıf isimlerine denk düştüğü bir anonim nesne örneği döndürür.

göst_yönü

Kaydırılabilir göstericili bir PDOStatement nesnesi için, bu değer hangi satırın döndürüleceğini belirler. PDO::FETCH_ORI_* sabitlerinden biri olmalıdır. PDO::FETCH_ORI_NEXT öntanımlı değerdir. PDOStatement nesnenize bir kaydırılabilir gösterici isteği yapmak için SQL deyimini PDO::prepare() ile hazırlarken PDO::CURSOR_SCROLL özelliğine PDO::ATTR_CURSOR özniteliğini atamalısınız.

göst_başlangıcı

Kaydırılabilir göstericili bir PDOStatement nesnesi için göst_yönü değiştirgesinde PDO::FETCH_ORI_ABS belirtilirse bu değer sonuç kümesinden alınacak mutlak satır numarasını belirler.

Kaydırılabilir göstericili bir PDOStatement nesnesi için göst_yönü değiştirgesinde PDO::FETCH_ORI_REL belirtilirse bu değer alınacak satırı bir önceki PDOStatement::fetch() çağrısındaki gösterici konumuna göreli olarak belirler.

Dönen Değerler

Bu işlevin dönüş değeri alım türüne bağlıdır. Bir başarısızlık durumunda daima FALSE döner.

Örnekler

Örnek 1 - Farklı alım tarzlarıyla satırların döndürülmesi

<?php
$sth 
$dbh->prepare("SELECT ad, renk FROM meyveler");
$sth->execute();

/* PDOStatement::fetch tarzlarını deneyelim */
print("PDO::FETCH_ASSOC:\n");
print(
"Sütun isimlerine göre indisli bir dizi olarak:\n");
$result $sth->fetch(PDO::FETCH_ASSOC);
print_r($result);
print(
"\n");

print(
"PDO::FETCH_BOTH:\n");
print(
"Sütun isimlerine ve numaralarına göre indisli bir dizi olarak:\n");
$result $sth->fetch(PDO::FETCH_BOTH);
print_r($result);
print(
"\n");

print(
"PDO::FETCH_LAZY:\n");
echo 
"Her özelliğin bir sütun ismine denk düştüğü bir anonim nesne olarak:\n";
$result $sth->fetch(PDO::FETCH_LAZY);
print_r($result);
print(
"\n");

print(
"PDO::FETCH_OBJ:\n");
echo 
"Her özelliğin bir sütun ismine denk düştüğü bir anonim nesne olarak:\n";
$result $sth->fetch(PDO::FETCH_OBJ);
print 
$result->NAME;
print(
"\n");
?>

Yukarıdaki örneğin çıktısı:

PDO::FETCH_ASSOC:
Sütun isimlerine göre indisli bir dizi olarak:
Array
(
    [AD] => elma
    [RENK] => kırmızı
)

PDO::FETCH_BOTH:
Sütun isimlerine ve numaralarına göre indisli bir dizi olarak:
Array
(
    [AD] => muz
    [0] => muz
    [RENK] => sarı
    [1] => sarı
)

PDO::FETCH_LAZY:
Her özelliğin bir sütun ismine denk düştüğü bir anonim nesne olarak:
PDORow Object
(
    [AD] => portakal
    [RENK] => turuncu
)

PDO::FETCH_OBJ:
Her özelliğin bir sütun ismine denk düştüğü bir anonim nesne olarak:
kivi

Örnek 2 - Satırları bir kaydırılabilir gösterici ile döndürmek

<?php
function readDataForwards($dbh) {
  
$sql 'SELECT hand, won, bet FROM mynumbers ORDER BY BET';
  try {
    
$stmt $dbh->prepare($sql,
              array(
PDO::ATTR_CURSOR => PDO::CURSOR_SCROLL));
    
$stmt->execute();
    while (
$row $stmt->fetch(PDO::FETCH_NUMPDO::FETCH_ORI_NEXT)) {
      
$data $row[0] . "\t" $row[1] . "\t" $row[2] . "\n";
      print 
$data;
    }
    
$stmt null;
  }
  catch (
PDOException $e) {
    print 
$e->getMessage();
  }
}
function 
readDataBackwards($dbh) {
  
$sql 'SELECT hand, won, bet FROM mynumbers ORDER BY bet';
  try {
    
$stmt $dbh->prepare($sql,
              array(
PDO::ATTR_CURSOR => PDO::CURSOR_SCROLL));
    
$stmt->execute();
    
$row $stmt->fetch(PDO::FETCH_NUMPDO::FETCH_ORI_LAST);
    do {
      
$data $row[0] . "\t" $row[1] . "\t" $row[2] . "\n";
      print 
$data;
    } while (
$row $stmt->fetch(PDO::FETCH_NUMPDO::FETCH_ORI_PRIOR));
    
$stmt null;
  }
  catch (
PDOException $e) {
    print 
$e->getMessage();
  }
}

print 
"İleriye doğru okuma:\n";
readDataForwards($conn);

print 
"Geriye doğru okuma:\n";
readDataBackwards($conn);
?>

Yukarıdaki örneğin çıktısı:

İleriye doğru okuma:
21    10    5
16    0     5
19    20    10

Geriye doğru okuma:
19    20    10
16    0     5
21    10    5

Ayrıca Bakınız



PDOStatement->fetchAll> <PDOStatement->execute
[edit] Last updated: Fri, 07 Jun 2013
 
add a note add a note User Contributed Notes PDOStatement->fetch - [23 notes]
up
2
gergo at gergoerdosi dot com
4 months ago
When using PDO::FETCH_COLUMN in a while loop, it's not enough to just use the value in the while statement as many examples show:

<?php
while ($row = $stmt->fetch(PDO::FETCH_COLUMN)) {
    print
$row;
}
?>

If there are 5 rows with values 1 2 0 4 5, then the while loop above will stop at the third row printing only 1 2. The solution is to either explicitly test for false:

<?php
while (($row = $stmt->fetch(PDO::FETCH_COLUMN)) !== false) {
    print
$row;
}
?>

Or use foreach with fetchAll():

<?php
foreach ($stmt->fetchAll(PDO::FETCH_COLUMN) as $row) {
    print
$row;
}
?>

Both will correctly print 1 2 0 4 5.
up
2
josh
5 years ago
Note that PDO::ATTR_STRINGIFY_FETCHES will NOT work for the MySQL driver. MySQL will always return strings because that is the behaviour of the core mysql PHP extension. See http://bugs.php.net/bug.php?id=44341
up
1
Gerard van Beek
5 years ago
If you to use a new instance of a class for a record you can use:

<?php
include_once("user.class");
$sth = $db->prepare("SELECT * FROM user WHERE id = 1");

/* create instance automatically */
$sth->setFetchMode( PDO::FETCH_CLASS, 'user');
$sth->execute();
$user = $sth->fetch( PDO::FETCH_CLASS );
$sth->closeCursor();
print (
$user->id);

/* or create an instance yourself and use it */
$user= new user();
$sth->setFetchMode( PDO::FETCH_INTO, $user);
$sth->execute();
$user= $sth->fetch( PDO::FETCH_INTO );
$sth->closeCursor();
print (
$user->id);
?>
up
6
henry at henrysmith dot org
1 year ago
Someone's already pointed out that PDO::CURSOR_SCROLL isn't supported by the SQLite driver. It's also worth noting that it's not supported by the MySQL driver either.

In fact, if you try to use scrollable cursors with a MySQL statement, the PDO::FETCH_ORI_ABS parameter and the offset given to fetch() will be silently ignored. fetch() will behave as normal, returning rows in the order in which they came out of the database.

It's actually pretty confusing behaviour at first. Definitely worth documenting even if only as a user-added note on this page.
up
4
lod
4 years ago
A quick one liner to get the first entry returned.  This is nice for very basic queries.

<?php
$count
= current($db->query("select count(*) from table")->fetch());
?>php
up
1
Ome Ko
1 year ago
Don't do
if($objStatement->fetch()) return $objStatement->fetch();

You want  
if($blah=$objStatement->fetch()) return $blah;

Trust me on this one.
up
1
public at grik dot net
2 years ago
When fetching an object, the constructor of the class is called after the fields are populated by default.

PDO::FETCH_PROPS_LATE is used to change the behaviour and make it work as expected - constructor be called _before_ the object fields will be populated with the data.

sample:

<?php
$a
= $PDO->query('select id from table');
$a->setFetchMode(PDO::FETCH_CLASS|PDO::FETCH_PROPS_LATE, 'ClassName');
$obj = $a->fetch();
?>

http://bugs.php.net/bug.php?id=53394
up
0
Alex
1 year ago
It seems that if you do a $statement->query() with an INSERT statement and after that a $statement->fetch() you will get an exception saying: SQLSTATE[HY000]: General error.
up
0
sumariva at gmail dot com
20 days ago
I got problems during fetch of stored procedures with mssql following PDOException:

SQLSTATE[IMSSP]: The active result for the query contains no fields

with a a prepared statement like:
 EXEC [mydb].[stored_procedure_that_returns_select] ?;

The solution was to supress the count of records
SET NOCOUNT ON; EXEC [mydb].[stored_procedure_that_returns_select] ?;

Hope it helps!
up
0
sumariva at gmail dot com
11 months ago
I could use PDO::FETCH_COLUMN to retrieve the first column from result.
$ps->fetch( PDO::FETCH_COLUMN );
Worked on Postgresql with PHP 5.3.10.
up
0
Typer85 at gmail dot com
3 years ago
Here is quick note for developers that use the PDO SQLite Driver:

The PDO SQLite driver does not support cursors, so using the PDO::CURSOR_SCROLL Attribute, will not work when using the PDO SQLite driver. For example:

<?php

// Assuming $Handle Is a PDO Handle.
$Statement = $Handle->query( $sqlStatement , array( PDO::ATTR_CURSOR => PDO::CURSOR_SCROLL ) );

?>

What is even worse is that PDO::prepare will NOT throw an Exception when it fails to prepare the query, even when the error mode is set to throw Exceptions, and will instead return a Boolean False!

Not only do I consider this a poor design choice, but also its a real shame that this is not documented anywhere in the manual -- in fact the manual is not clear on what Attributes are supported by which drivers and which are not so developers are left to play a classic game of guess.

I hope this saves some developers some headaches.

Good Luck,
up
0
lozitskiys at gmail dot com
4 years ago
I spent some hours trying to find out how to manipulate with BLOB fields using PDO.

Remember that you can't retreive BLOB data using something like this :

<?php
$sql
= 'SELECT * FROM sometable LIMIT 1';
$stmt = $dbh->prepare($sql);
$stmt->execute();
$stmt->setAttribute(PDO::FETCH_ASSOC);
$row = $stmt->fetch();

$myFile = $row['file'];
?>

Instead of this you should try following approach:

<?php
$sql
= "SELECT mime, file FROM sometable LIMIT 1";
$stmt = $dbh->prepare($sql);
$stmt->execute();

$stmt->bindColumn(1, $mime,);
$stmt->bindColumn(2, $file, PDO::PARAM_LOB);

$stmt->fetch();

header('Content-type: '.$mime);
print
$file;

?>
up
0
BaBna
5 years ago
When you do a SELECT query for one row, and want to check if it's there, you don't need to count the fetchAll() result, you can just check if $result->fetch() is true:
<?php
$bbnq
= sprintf("SELECT login
FROM users
WHERE id = %u"
,27);
try
    {
$req = $db_bbn->query($bbnq); }
catch (
Exception $e)
    {
bbnf_pdo_error($e,__FILE__,__LINE__); }
if (
$r = $req->fetch() )
    { echo
"This query has a row result"; }
else
    { echo
"This query has an empty result"; }
?>
up
0
marcini
6 years ago
Be careful with fetch() when you use prepared statements and MySQL (I don`t know how it is with other databases). Fetch won`t close cursor and won`t let you send any other query, even if your result set has only one row, .
If you use $statement->fetch(), you will also have to use $statement->closeCursor() afterwards, to be albe to execute another query.
Alternatively you can use $statement->fetchAll() without $statement->closeCursor().
up
0
terry at bitsoup dot com
7 years ago
WARNING:
fetch() does NOT adhere to SQL-92 SQLSTATE standard when dealing with empty datasets.

Instead of setting the errorcode class to 20 to indicate "no data found", it returns a class of 00 indicating success, and returns NULL to the caller.

This also prevents the exception mechainsm from firing.

Programmers will need to explicitly code tests for empty resultsets after any fetch*() instead of relying on the default behavior of the RDBMS.

I tried logging this as a bug, but it was dismissed as "working as intended". Just a head's up.
up
0
avinoamr at gmail dot com
7 years ago
Note that using the FETCH_CLASS mechanism does NOT trigger the class's constructor! You must explicity instantiate the class to use it's constructor behavior.
up
0
fh at ez dot no
7 years ago
I can also add that the constructor is run _after_ the data is set on the object if yo use PDO::FETCH_CLASS.
up
0
fh at ez dot no
7 years ago
If you want to use PDO::FETCH_CLASS you need to set it up with setFetchMode first like so:
        $stmt->setFetchMode( PDO::FETCH_CLASS, 'classType', array( 'parameters to constructor' );
        $object = $stmt->fetch( PDO::FETCH_CLASS );
If you ommit this PHP will segfault.
up
0
aledmb at gmail dot com
7 years ago
note that fetch constants are not included in the PDO class for PHP versions prior to 5.1
up
-1
Negative Black
2 years ago
When fetching multiple rows into an object. It is necessary to clone the objects returned by the PDOStatement::fetch() operation. Otherwise you will just get a list of pointers to the object located inside the statement, containing the information of the last row.

Example:
<?php
$stmt
= $pdoLink->prepare("SELECT * FROM `table`;");
$stmt->setFetchMode(PDO::FETCH_INTO, new myClass());
$stmt->execute();

// Assuming there are multiple rows in the table.
while ($object = $stmt->fetch()) {
   
$result[] = clone $object;
}

var_dump($result);
?>
up
-1
Typer85 at gmail dot com
3 years ago
Just thought I would point out something interesting that caught my eye.

Once you retrieve a PDOStatement, whether for a prepared statement or a normal result set, the connection status of your PDO handle is no longer taken into consideration!

The PHP Manual clearly states that to open a PDO connection, create a new Instance of the PDO Class. To close a PDO connection, destroy the Instance, possibly by setting it to a Null Reference. The PDO Instance in this case is your handle.

Here is the interesting part. If you close the PDO connection, as described above, you can still continue to either execute a prepared statement or iterate through a result set!

For example, the following code will work perfectly fine:

<?php

// Open Handle.
$Handle = new PDO( 'mysql:host=localhost; dbname=LOG' , 'root' );
$Handle->setAttribute( PDO::ATTR_ERRMODE , PDO::ERRMODE_EXCEPTION );

// Prepare Statement.
$Statement = $Handle->prepare( "SELECT * FROM ERROR" );

// Close Handle.
$Handle null;

// Execute Statement. Amazing How There Is No Problem Even Though The Connection Is Closed!
$Statement->execute();

// Iterate Result. Again, Amazing How There Is No Problem!
while( $row = $Statement->fetch( PDO::FETCH_BOTH , PDO::FETCH_ORI_NEXT ) ) {
}

?>

You do not even need to prepare a statement. A native query also has no problems, like the following code:

<?php

// Open Handle.
$Handle = new PDO( 'mysql:host=localhost; dbname=LOG' , 'root' );
$Handle->setAttribute( PDO::ATTR_ERRMODE , PDO::ERRMODE_EXCEPTION );

// Query Statement.
$Statement = $Handle->query( "SELECT * FROM ERROR" );

// Close Handle.
$Handle null;

// Iterate Result.
$Statement->fetchAll( );

?>

I am not sure if this is a bug or not but its a big gottcha for developers coming from other envrionments, such as .NET or even those PHP developers used to using the native database functions before PDO came around.

For example, using the native mysql_* Functions, the following will not work:

<?php

mysql_connect
( "localhost" , "root");
mysql_select_db( "LOG" );
mysql_close( );
mysql_query( "SELECT * FROM ERROR" );

?>

Good Luck,
up
-1
dj UNDERSCORE robe AT hotmail DOT com
3 years ago
A word of caution regarding fh at ez dot no's note: as of PHP 5.2.12 the constructor is called *before* the data is set in FETCH_CLASS mode.  The previous behaviour seems to be considered a bug (http://bugs.php.net/bug.php?id=49521), so don't rely on it.
up
-1
daltenho at yahoo dot com
5 years ago
As an alternative to marcini's suggestion:

You can use:

        $dbh->setAttribute(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, true);

...on your PDO connection object to allow query buffering in MySQL. This will eliminate the problem of re-preparing an unclosed statement object.

 
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