PDO::setAttribute

(PHP 5 >= 5.1.0, PHP 7, PHP 8, PECL pdo >= 0.1.0)

PDO::setAttribute — Establece un atributo

Descripción

public PDO::setAttribute(int $attribute, mixed $value): bool

Establece un atributo en el manejador de la base de datos. Algunos de los atributos genéricos disponibles están listados a continuación; algunos drivers pueden hacer uso de atributos adicionales específicos.

PDO::ATTR_CASE: Fuerza a los nombres de columnas a una capitalización específica.
- PDO::CASE_LOWER: Fuerza a los nombres de columnas a minúsculas.
- PDO::CASE_NATURAL: Deja los nombres de columnas como son devueltas por el driver de la base de datos.
- PDO::CASE_UPPER: Fuerza a los nombres de columnas a mayúsculas.
PDO::ATTR_ERRMODE: Reporte de errores.
- PDO::ERRMODE_SILENT: Establece los códigos de error.
- PDO::ERRMODE_WARNING: Eleva E_WARNING.
- PDO::ERRMODE_EXCEPTION: Lanza exceptions.
PDO::ATTR_ORACLE_NULLS (disponible para todos los drivers, no sólo Oracle): Conversión de NULL y cadenas vacías.
- PDO::NULL_NATURAL: Sin conversión.
- PDO::NULL_EMPTY_STRING: Las cadenas vacías son convertidas a null.
- PDO::NULL_TO_STRING: NULL se convierte a cadenas vacías.
PDO::ATTR_STRINGIFY_FETCHES: Convierte los valores numéricos a cadenas cuando se buscan. Requiere bool.
PDO::ATTR_STATEMENT_CLASS: Establece la clase de sentencia proporcionada por el usuario derivada de PDOStatement. No puede ser usado con instancias PDO persistentes. Requiere array(string classname, array(mixed constructor_args)).
PDO::ATTR_TIMEOUT: Especifica la duración del tiempo de espera en segundos Specifies the timeout duration in seconds. Not all drivers support this option, and it's meaning may differ from driver to driver. For example, sqlite will wait for up to this time value before giving up on obtaining an writable lock, but other drivers may interpret this as a connect or a read timeout interval. Requires int.
PDO::ATTR_AUTOCOMMIT (available in OCI, Firebird and MySQL): Whether to autocommit every single statement.
PDO::ATTR_EMULATE_PREPARES Enables or disables emulation of prepared statements. Some drivers do not support native prepared statements or have limited support for them. Use this setting to force PDO to either always emulate prepared statements (if true), or to try to use native prepared statements (if false). It will always fall back to emulating the prepared statement if the driver cannot successfully prepare the current query. Requires bool.
PDO::MYSQL_ATTR_USE_BUFFERED_QUERY (available in MySQL): Use buffered queries.
PDO::ATTR_DEFAULT_FETCH_MODE: Set default fetch mode. Description of modes is available in PDOStatement::fetch() documentation.

Valores devueltos

Devuelve true en caso de éxito o false en caso de error.

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User Contributed Notes 12 notes

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117

colinganderson [at] gmail [dot] com ¶

17 years ago


Because no examples are provided, and to alleviate any confusion as a result, the setAttribute() method is invoked like so:

setAttribute(ATTRIBUTE, OPTION);

So, if I wanted to ensure that the column names returned from a query were returned in the case the database driver returned them (rather than having them returned in all upper case [as is the default on some of the PDO extensions]), I would do the following:

<?php
// Create a new database connection.
$dbConnection = new PDO($dsn, $user, $pass);

// Set the case in which to return column_names.
$dbConnection->setAttribute(PDO::ATTR_CASE, PDO::CASE_NATURAL);
?>

Hope this helps some of you who learn by example (as is the case with me).

.Colin

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yeboahnanaosei at gmail dot com ¶

6 years ago


This is an update to a note I wrote earlier concerning how to set multiple attributes when you create you PDO connection string.

You can put all the attributes you want in an associative array and pass that array as the fourth parameter in your connection string. So it goes like this: 
<?php
$options = [
    PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
    PDO::ATTR_CASE => PDO::CASE_NATURAL,
    PDO::ATTR_ORACLE_NULLS => PDO::NULL_EMPTY_STRING
];

// Now you create your connection string
try {
    // Then pass the options as the last parameter in the connection string
    $connection = new PDO("mysql:host=$host; dbname=$dbname", $user, $password, $options);

    // That's how you can set multiple attributes
} catch(PDOException $e) {
    die("Database connection failed: " . $e->getMessage());
}
?>

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yeboahnanaosei at gmail dot com ¶

7 years ago


Well, I have not seen it mentioned anywhere and thought its worth mentioning. It might help someone. If you are wondering whether you can set multiple attributes then the answer is yes.

You can do it like this:
try {
    $connection = new PDO("mysql:host=$host; dbname=$dbname", $user, $password);
    // You can begin setting all the attributes you want.
    $connection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $connection->setAttribute(PDO::ATTR_CASE, PDO::CASE_NATURAL);
    $connection->setAttribute(PDO::ATTR_ORACLE_NULLS, PDO::NULL_EMPTY_STRING);

    // That's how you can set multiple attributes
}
catch(PDOException $e)
{
    die("Database connection failed: " . $e->getMessage());
}

I hope this helps somebody. :)

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Anonymous ¶

3 years ago


Note that contrary to most PDO methods, setAttribute does not throw a PDOException when it returns false.

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gregory dot szorc at gmail dot com ¶

17 years ago


It is worth noting that not all attributes may be settable via setAttribute().  For example, PDO::MYSQL_ATTR_MAX_BUFFER_SIZE is only settable in PDO::__construct().  You must pass PDO::MYSQL_ATTR_MAX_BUFFER_SIZE as part of the optional 4th parameter to the constructor.  This is detailed in http://bugs.php.net/bug.php?id=38015

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steve at websmithery dot co dot uk ¶

7 years ago


For PDO::ATTR_EMULATE_PREPARES, the manual states a boolean value is required. However, when getAttribute() is used to check this value, an integer (1 or 0) is returned rather than true or false.

This means that if you are checking a PDO object is configured as required then

<?php
        // Check emulate prepares is off
        if ($pdo->getAttribute(\PDO::ATTR_EMULATE_PREPARES) !== false) {
            /* do something */
        }
?>

will always 'do something', regardless.

Either

<?php
        // Check emulate prepares is off
        if ($pdo->getAttribute(\PDO::ATTR_EMULATE_PREPARES) != false) {
            /* do something */
        }
?>

or

<?php
        // Check emulate prepares is off
        if ($pdo->getAttribute(\PDO::ATTR_EMULATE_PREPARES) !== 0) {
            /* do something */
        }
?>

is needed instead.

Also worth noting that setAttribute() does, in fact, accept an integer value if you want to be consistent.

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antoyo ¶

13 years ago


There is also a way to specifie the default fetch mode :

<?php

$connection = new PDO($connection_string);

$connection->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_OBJ);

?>

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-3

rob51 at mac dot com ¶

6 years ago


Where would I find the default values of attributes?

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-7

guillaume at thug dot com ¶

7 years ago


function pdo_connect(){
  try {

      $pdo = new PDO('mysql:host=localhost;dbname='.DB_NAME, DB_USER, DB_PASS);
      $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);     
      $pdo->setAttribute( PDO::ATTR_EMULATE_PREPARES, false );           
      $pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);

  } catch (PDOException $e) {

      die("Error!: " . $e->getMessage() . "<br/>");

  }

  return $pdo;
}

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-9

justinasu at gmail dot com ¶

8 years ago


in v5.5 PDO::MYSQL_ATTR_USE_BUFFERED_QUERY can only be set in PDO constructor, not by passing it into setAttribute. 
If you set it with setAttribute it will not work. getAttribute(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY) will return 0.

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-9

vstoykov at proab dot info ¶

6 years ago


I am using PHP 5.6 and MySQL 5.0 on GoDaddy.
When executing a query like this:
<?php
    $stmt = $this->PDO->query("SHOW CREATE TABLE table");
?>
I get:
Uncaught exception 'PDOException' with message 
'SQLSTATE[HY000]: General error: 2030 This command is not supported in the prepared statement protocol yet' 
After I added:
<?php
    $this->PDO->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
?>
the query was executed successfully.

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-15

m dot leuffen at gmx dot de ¶

18 years ago


Hi,

if you are wondering about a size-bound (1 MB) on blob and text fields after upgrading to PHP5.1.4. You might try to increase this limit by using the setAttribute() method.

This will fail. Instead use the options array when instantiating the pdo:

$pdo = new PDO ("connection_settings", "user", "pass", array
(PDO::MYSQL_ATTR_MAX_BUFFER_SIZE=>1024*1024*50));

This should fix the problem and increase the limit to 50 MB.

Bye,
  Matthias

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