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# PDO->getAttribute()

(no version information, might be only in CVS)

PDO->getAttribute() -- Retrieve a database connection attribute

## 说明

class PDO {
mixed getAttribute ( int attribute )
}

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.

## 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_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

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

## 范例

例 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"; } ?>`

## 参见

PDO->setAttribute()
PDOStatement->getAttribute()
PDOStatement->setAttribute()

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