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# PDO::getAttribute

(no version information, might be only in CVS)

PDO::getAttribute -- Retrieve a database connection attribute

## 说明

mixed PDO::getAttribute ( long attribute )

警告
本函数是实验性的。本函数的行为，包括函数名称以及其它任何关于本函数的文档可能会在没有通知的情况下随 PHP 以后的发布而改变。使用本函数风险自担。

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

Note that some databases may not support all of the database connection attributes.

## 参数

attribute

  One of the PDO_ATTR_* constants. The constants that apply to database connections are as follows:

  PDO_ATTR_AUTOCOMMIT
  PDO_ATTR_CASE
  PDO_ATTR_CLIENT_VERSION
  PDO_ATTR_CONNECTION_STATUS
  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

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

## 例

例子 1. Retrieving database connection attributes
`<?php $conn = new PDO('odbc:sample', 'db2inst1', 'ibmdb2'); print "\nPDO_ATTR_AUTOCOMMIT: "; print $conn->getAttribute(PDO_ATTR_AUTOCOMMIT); print "\nPDO_ATTR_ERRMODE: "; print $conn->getAttribute(PDO_ATTR_ERRMODE); print "\nPDO_ATTR_CASE: "; print $conn->getAttribute(PDO_ATTR_CASE); print "\nPDO_ATTR_CLIENT_VERSION: "; print $conn->getAttribute(PDO_ATTR_CLIENT_VERSION); print "\nPDO_ATTR_CONNECTION_STATUS: "; print $conn->getAttribute(PDO_ATTR_CONNECTION_STATUS); print "\nPDO_ATTR_ORACLE_NULLS: "; print $conn->getAttribute(PDO_ATTR_ORACLE_NULLS); print "\nPDO_ATTR_PERSISTENT: "; print $conn->getAttribute(PDO_ATTR_PERSISTENT); print "\nPDO_ATTR_PREFETCH: "; print $conn->getAttribute(PDO_ATTR_PREFETCH); print "\nPDO_ATTR_SERVER_INFO: "; print $conn->getAttribute(PDO_ATTR_SERVER_INFO); print "\nPDO_ATTR_SERVER_VERSION: "; print $conn->getAttribute(PDO_ATTR_SERVER_VERSION); print "\nPDO_ATTR_TIMEOUT: "; print $conn->getAttribute(PDO_ATTR_TIMEOUT); ?>`

## 参见

PDO::setAttribute()
PDOStatement::getAttribute()
PDOStatement::setAttribute()

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