本文介绍了PHP Data Objects (PDO) 扩展，它为PHP提供了轻量级且一致的数据访问接口。PDO允许通过相同的函数集来查询和获取数据，无论使用哪种数据库。值得注意的是，PDO本身不提供数据库抽象层，也不重写SQL或模拟缺失的功能。
[b]Introduction[/b]
The PHP Data Objects (PDO) extension defines a lightweight, consistent interface for accessing databases in PHP. Each database driver that implements the PDO interface can expose database-specific features as regular extension functions. Note that you cannot perform any database functions using the PDO extension by itself; you must use a database-specific PDO driver to access a database server.
PDO provides a [b]data-access[/b] abstraction layer, which means that, regardless of which database you're using, you use the same functions to issue queries and fetch data. PDO does not provide a database abstraction; it doesn't rewrite SQL or emulate missing features. You should use a full-blown abstraction layer if you need that facility.
PDO ships with PHP 5.1, and is available as a PECL extension for PHP 5.0; PDO requires the new OO features in the core of PHP 5, and so will not run with earlier versions of PHP.
[list]
[*]pdo,就是php里的jdbc.
[*]pdo是一个扩展，所以需要额外编译才会有支持.
[*]php5才支持pdo,老版本就不要想了.
[/list]
The PHP Data Objects (PDO) extension defines a lightweight, consistent interface for accessing databases in PHP. Each database driver that implements the PDO interface can expose database-specific features as regular extension functions. Note that you cannot perform any database functions using the PDO extension by itself; you must use a database-specific PDO driver to access a database server.
PDO provides a [b]data-access[/b] abstraction layer, which means that, regardless of which database you're using, you use the same functions to issue queries and fetch data. PDO does not provide a database abstraction; it doesn't rewrite SQL or emulate missing features. You should use a full-blown abstraction layer if you need that facility.
PDO ships with PHP 5.1, and is available as a PECL extension for PHP 5.0; PDO requires the new OO features in the core of PHP 5, and so will not run with earlier versions of PHP.
[list]
[*]pdo,就是php里的jdbc.
[*]pdo是一个扩展，所以需要额外编译才会有支持.
[*]php5才支持pdo,老版本就不要想了.
[/list]
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