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PDOStatement::bindValue> <PDOStatement::bindColumn
[edit] Last updated: Fri, 10 Feb 2012

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PDOStatement::bindParam

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

PDOStatement::bindParam Lie un paramètre à un nom de variable spécifique

Description

bool PDOStatement::bindParam ( mixed $parameter , mixed &$variable [, int $data_type = PDO::PARAM_STR [, int $length [, mixed $driver_options ]]] )

Lie une variable PHP à un marquer nommé ou interrogatif correspondant dans une requête SQL utilisée pour préparer la requête. Contrairement à PDOStatement::bindValue(), la variable est liée en tant que référence et ne sera évaluée qu'au moment de l'appel à la fonction PDOStatement::execute().

La plupart des paramètres sont des paramètres d'entrées, et sont utilisés en lecture seule pour construire la requête. Quelques drivers supportent l'invocation de procédures stockées qui retournent des données en tant que paramètres de sortie, et quelques autres en tant que paramètres entrées / sorties qui sont envoyés ensemble et sont mis à jour pour les recevoir.

Liste de paramètres

parameter

Identifiant. Pour une requête préparée utilisant des marqueurs nommés, ce sera le nom du paramètre sous la forme :name. Pour une requête préparée utilisant les marqueurs interrogatifs, ce sera la position indexé -1 du paramètre.

variable

Nom de la variable PHP à lier au paramètre de la requête SQL.

data_type

Type explicite de données pour le paramètre utilisant la constante PDO::PARAM_*. Pour retourner un paramètre INOUT depuis une procédure stockée, utilisez l'opérateur OR pour définir l'octet PDO::PARAM_INPUT_OUTPUT pour le paramètre data_type.

length

Longueur du type de données. Pour indiquer qu'un paramètre est un paramètre OUT depuis une procédure stockée, vous devez explicitement définir la longueur.

driver_options

Valeurs de retour

Cette fonction retourne TRUE en cas de succès ou FALSE si une erreur survient.

Exemples

Exemple #1 Exécution d'une requête préparée avec des emplacements nommés

<?php
/* Exécution d'une requête préparée en liant des variables PHP */
$calories 150;
$couleur 'rouge';
$sth $dbh->prepare('SELECT nom, couleur, calories
    FROM fruit
    WHERE calories < :calories AND couleur = :couleur'
);
$sth->bindParam(':calories'$caloriesPDO::PARAM_INT);
$sth->bindParam(':couleur'$couleurPDO::PARAM_STR12);
$sth->execute();
?>

Exemple #2 Exécution d'une requête préparée avec des marques de positionnement

<?php
/* Exécution d'une requête préparée en liant des variables PHP */
$calories 150;
$couleur 'rouge';
$sth $dbh->prepare('SELECT nom, couleur, calories
    FROM fruit
    WHERE calories < ? AND couleur = ?'
);
$sth->bindParam(1$caloriesPDO::PARAM_INT);
$sth->bindParam(2$couleurPDO::PARAM_STR12);
$sth->execute();
?>

Exemple #3 Appel une procédure stockée avec un paramètre INOUT

<?php
/* Appel une procédure stockée avec un paramètre INOUT */
$couleur 'rouge';
$sth $dbh->prepare('CALL puree_fruit(?)');
$sth->bindParam(1$couleurPDO::PARAM_STR|PDO::PARAM_INPUT_OUTPUT12);
$sth->execute();
print(
"Après avoir pressé le fruit, la couleur est : $couleur");
?>

Voir aussi



PDOStatement::bindValue> <PDOStatement::bindColumn
[edit] Last updated: Fri, 10 Feb 2012
 
add a note add a note User Contributed Notes PDOStatement::bindParam
cyrylas at gmail dot com 10-Jan-2011 02:23
Please note, that PDO format numbers according to current locale. So if, locale set number format to something else, that standard that query WILL NOT work properly.

For example:
in Polish locale (pl_PL) proper decimal separator is coma (","), so: 123,45, not 123.45. If we try bind 123.45 to the query, we will end up with coma in the query.

<?php
setlocale
(LC_ALL, 'pl_PL');
$sth = $dbh->prepare('SELECT name FROM products WHERE price < :price');
$sth->bindParam(':price', 123.45, PDO::PARAM_STR);
$sth->execute();
// result:
// SELECT name FROM products WHERE price < '123,45';
?>
ReK_ 19-Oct-2010 12:59
This confused me for some time because it is never explicitly mentioned, but PDO will automagically encapsulate parameters for you, so a prepared query that is manually escaped like so:

"INSERT INTO table (column) VALUES (':value');"

Will actually end up being double-quoted and can cause problems.
atrandafirc at yahoo dot com 31-Aug-2010 08:37
I know this has been said before but I'll write a note on it too because I think it's important to keep in mind:

If you use PDO bindParam to do a search with a LIKE condition you cannot put the percentages and quotes to the param placeholder '%:keyword%'.

This is WRONG:
"SELECT * FROM `users` WHERE `firstname` LIKE '%:keyword%'";

The CORRECT solution is to leave clean the placeholder like this:
"SELECT * FROM `users` WHERE `firstname` LIKE :keyword";

And then add the percentages to the php variable where you store the keyword:
$keyword = "%".$keyword."%";

And finally the quotes will be automatically added by PDO when executing the query so you don't have to worry about them.

So the full example would be:
<?php
// Get the keyword from query string
$keyword = $_GET['keyword'];
// Prepare the command
$sth = $dbh->prepare('SELECT * FROM `users` WHERE `firstname` LIKE :keyword');
// Put the percentage sing on the keyword
$keyword = "%".$keyword."%";
// Bind the parameter
$sth->bindParam(':keyword', $keyword, PDO::PARAM_STR);
?>
sergiy dot sokolenko at gmail dot com 02-Jul-2010 05:22
Note that you cannot mix named and positional parameters in one query:

<?php
$stmt
= $conn->prepare('SELECT * FROM employees WHERE name LIKE :name OR email LIKE ?');
$name = 'John%';
$email = 'john%';

$stmt->bindParam(':name', $name);
$stmt->bindParam(1, $email);

$stmt->execute();
?>

Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[HY093]: Invalid parameter number: mixed named and positional parameters' in ...

Running PHP 5.3.2 on Linux x86-64
Vili 28-May-2010 02:01
This works ($val by reference):
<?php
foreach ($params as $key => &$val) {
   
$sth->bindParam($key, $val);
}
?>

This will fail ($val by value, because bindParam needs &$variable):
<?php
foreach ($params as $key => $val) {
   
$sth->bindParam($key, $val);
}
?>
geompse at gmail dot com 29-Jan-2010 04:30
if you are storing files (or binary data), using PARAM_LOB (and moreover trying to do this with Oracle), don't miss this page :

http://php.net/manual/en/pdo.lobs.php

You will there notice that PDO-PGSQL and PDO-OCI don't work the same at all : not the same argument nor the same behaviour.
Steve M 19-Nov-2009 12:28
Note that when using PDOStatement::bindParam an integer is changed to a string value upon PDOStatement::execute(). (Tested with MySQL).

This can cause problems when trying to compare values using the === operator.

Example:
<?php
$active
= 1;
var_dump($active);
$ps->bindParam(":active", $active, PDO::PARAM_INT);
var_dump($active);
$ps->execute();
var_dump($active);
if (
$active === 1) {
   
// do something here
    // note: this will fail since $active is now "1"
}
?>

results in:
int(1)
int(1)
string(1) "1"
dhammari at q90 dot com 08-Jul-2009 01:22
There seems to be some confusion about whether you can bind a single value to multiple identical placeholders. For example:

$sql = "SELECT * FROM user WHERE is_admin = :myValue AND is_deleted = :myValue ";

$params = array("myValue" => "0");

Some users have reported that attempting to bind a single parameter to multiple placeholders yields a parameter mismatch error in PHP version 5.2.0 and earlier. Starting with version 5.2.1, however, this seems to work just fine.

For details, see bug report 40417:
http://bugs.php.net/bug.php?id=40417
jeffwa+php at gmail dot com 11-Jul-2007 03:49
Took me forever to find this elsewhere in the notes in the manual, so I'd thought I'd put this tidbit here to help others in the future.

When using a LIKE search in MySQL along with a prepared statement, the *value* must have the appropriate parentheses attached before the bindParam() statement as such:

<?php
$dbc
= $GLOBALS['dbc'];
$sql = "SELECT * FROM `tbl_name` WHERE tbl_col LIKE ?";
$stmt = $dbc->prepare($sql);

$value = "%{$value}%";
$stmt->bindParam($i, $value, PDO::PARAM_STR);
?>

Trying to use
<?php
$stmt
->bindParam($i, "%{$value}%", PDO::PARAM_STR);
?>

will fail.
willie at spenlen dot com 14-Jun-2007 01:49
If you're using the MySQL driver and have a stored procedure with an OUT or INOUT parameter, you can't (currently) use bindValue(). See http://bugs.php.net/bug.php?id=35935 for a workaround.
Filofox 10-Apr-2006 05:09
Do not try to use the same named parameter twice in a single SQL statement, for example

<?php
$sql
= 'SELECT * FROM some_table WHERE  some_value > :value OR some_value < :value';
$stmt = $dbh->prepare($sql);
$stmt->execute( array( ':value' => 3 ) );
?>

...this will return no rows and no error -- you must use each parameter once and only once. Apparently this is expected behavior (according to this bug report: http://bugs.php.net/bug.php?id=33886)  because of portability issues.
05-Feb-2006 03:25
A caution for those using bindParam() on a placeholder in a
LIKE '%...%' clause, the following code will likely not work:

<?php
$q
= "SELECT id, name FROM test WHERE name like '%:foo%'";
$s = "carrot";
$sth = $dbh->prepare($q);
$sth->bindParam(':foo', $s);
$sth->execute();
?>

What is needed is something like the following:

<?php
$s
= "%$s%";
$sth->bindParam(':foo', $s);
?>

This should work. Tested against mysql 4.1, PHP 5.1.3.

 
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