PDO::getAttribute

(PHP 5 >= 5.1.0, PHP 7, PHP 8, PECL pdo >= 0.2.0)

PDO::getAttribute — Retrieve a database connection attribute

Descrizione

public PDO::getAttribute(int $attribute): mixed

This function returns the value of a database connection attribute. To retrieve PDOStatement attributes, refer to PDOStatement::getAttribute().

Note that some database/driver combinations may not support all of the database connection attributes.

Elenco dei parametri

attribute

One of the PDO::ATTR_* constants. The generic attributes that apply to database connections are as follows:

PDO::ATTR_AUTOCOMMIT
PDO::ATTR_CASE
PDO::ATTR_CLIENT_VERSION
PDO::ATTR_CONNECTION_STATUS
PDO::ATTR_DRIVER_NAME
PDO::ATTR_ERRMODE
PDO::ATTR_ORACLE_NULLS
PDO::ATTR_PERSISTENT
PDO::ATTR_PREFETCH
PDO::ATTR_SERVER_INFO
PDO::ATTR_SERVER_VERSION
PDO::ATTR_TIMEOUT

Some drivers may make use of additional driver specific attributes. Note that driver specific attributes must not be used with other drivers.

Valori restituiti

A successful call returns the value of the requested PDO attribute. An unsuccessful call returns null.

Errori/Eccezioni

PDO::getAttribute() may throw a PDOException when the underlying driver does not support the requested attribute.

Esempi

Example #1 Retrieving database connection attributes

<?php
$conn = new PDO('odbc:sample', 'db2inst1', 'ibmdb2');
$attributes = array(
    "AUTOCOMMIT", "ERRMODE", "CASE", "CLIENT_VERSION", "CONNECTION_STATUS",
    "ORACLE_NULLS", "PERSISTENT", "PREFETCH", "SERVER_INFO", "SERVER_VERSION",
    "TIMEOUT"
);

foreach ($attributes as $val) {
    echo "PDO::ATTR_$val: ";
    echo $conn->getAttribute(constant("PDO::ATTR_$val")) . "\n";
}
?>

Vedere anche:

PDO::setAttribute() - Set an attribute
PDOStatement::getAttribute() - Retrieve a statement attribute
PDOStatement::setAttribute() - Set a statement attribute

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User Contributed Notes 2 notes

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Phil Hilton ¶

6 years ago


Better example that handles unsupported attributes gracefully:

<?php

$conn = new PDO( 'odbc:sample', 'db2inst1', 'ibmdb2' );
$conn->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );

$attributes = array(
    "AUTOCOMMIT", "ERRMODE", "CASE", "CLIENT_VERSION", "CONNECTION_STATUS",
    "ORACLE_NULLS", "PERSISTENT", "PREFETCH", "SERVER_INFO", "SERVER_VERSION",
    "TIMEOUT"
);

foreach ( $attributes as $val ) {
    echo "PDO::ATTR_$val: ";
    try {
        echo $conn->getAttribute( constant( "PDO::ATTR_$val" ) ) . "\n";
    } catch ( PDOException $e ) {
        echo $e->getMessage() . "\n";
    }
}

?>

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Robert Parham ¶

9 years ago


Oracle does not have the following attributes:

PDO::ATTR_CONNECTION_STATUS: SQLSTATE[IM001]: Driver does not support this function: driver does not support that attribute
PDO::ATTR_PREFETCH: SQLSTATE[IM001]: Driver does not support this function: driver does not support that attribute
PDO::ATTR_TIMEOUT: SQLSTATE[IM001]: Driver does not support this function: driver does not support that attribute

The rest work fine.

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