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

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

    此方法返回数据库连接属性的值。要检索 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_* 常量之一。下列为应用到数据库连接中的通用属性：

    • 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

    一些驱动程序可能会使用额外的特定驱动程序属性。请注意，特定驱动程序的属性不能与其它驱动程序一起使用。

    返回值

    成功调用则返回请求的 PDO 属性值。不成功则返回 null。

    错误／异常

    当底层驱动程序不支持请求的 attribute 时， PDO::getAttribute() 可能会抛出 PDOException。

    示例

    示例 #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

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    用户贡献的备注 2 notes

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    5
    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";
    }
    }

    ?>
    up
    0
    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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