PDO::getAttribute()

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

取回一个数据库连接的属性

说明

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

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

取回数据库连接属性

参见

• PDO::setAttribute() 设置属性
• PDOStatement::getAttribute() 检索一个语句属性
• PDOStatement::setAttribute() 设置一个语句属性

Better example that handles unsupported attributes gracefully: 

Mysql on version "5.6.29" not support "PDO::ATTR_PREFETCH" and "PDO::ATTR_TIMEOUT"

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.

As of 30-Jan-2016, MariaDB on version "5.5.5-10.1.9-MariaDB" apparently does not support: "PREFETCH" nor "TIMEOUT".

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 ...

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