PDO::getAttribute

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

PDO::getAttribute — 取回一个数据库连接的属性

说明

PDO::getAttribute ( int $attribute ) : mixed

此函数（方法）返回一个数据库连接的属性值。 取回 PDOStatement 属性，请参阅 PDOStatement::getAttribute()。

注意有些数据库/驱动可能不支持所有的数据库连接属性。

参数

attribute

PDO::ATTR_* 常量中的一个。下列为应用到数据库连接中的常量：

  • 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

返回值

成功调用则返回请求的 PDO 属性值。不成功则返回 null。

范例

Example #1 取回数据库连接属性

<?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";
}
?>

参见

User Contributed Notes

grzegorz dot adam dot kowalski at gmail dot com 19-Mar-2020 02:32
On PHP 7.4.4 an unsuccessful call returns FALSE, not NULL.
Phil Hilton 15-Jun-2018 01:54
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";
    }
}

?>
756567406 at qq dot com 01-Dec-2016 02:13
Mysql on version  "5.6.29" not support "PDO::ATTR_PREFETCH"  and "PDO::ATTR_TIMEOUT"
mfinkyr at gmail dot com 30-Jan-2016 11:37
As of 30-Jan-2016, MariaDB on version "5.5.5-10.1.9-MariaDB" apparently  does not support: "PREFETCH" nor "TIMEOUT".
Robert Parham 02-Sep-2015 06:45
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.
peter dot hopfgartner at r3-gis dot com 08-Sep-2009 01:44
The Oracle driver seems to not support PDO::getAttribute():

ociPHP Fatal error:  Uncaught exception 'PDOException' with message 'SQLSTATE[IM001]: Driver does not support this function: driver does not support getting attributes' in ...