PHP_PDO 简介

php5原来内建的sqlite扩展只支持sqlite2，对sqlite3的支持可以用多种方法实现，我觉得最方便的还是pdo，只需在安装配置php时，设置pdo_sqlite扩展，不需要安装其他的东西。当然功能能也许不及专门的sqlite3扩展。根据官方文档逐渐翻译学习！
http://cn2.php.net/manual/en/intro.pdo.php

PHP Data Objects (PDO)扩展是PHP中一个轻量级的、统一的数据接口。每种数据库依靠特定的正则函数驱动PDO接口，能反映出数据库特征。注意：你不能单独仅依靠PDO扩展来访问任何数据库；你必须使用特定数据库PDO驱动来访问数据库服务器。

PDO提供一个数据访问层，意思是，不管你使用那种数据库，都可以用同样的函数执行查询和获取结果。PDO不提供数据库抽象，如果你需要该功能应该使用成熟的抽象。

PDO是在PHP5.1 中引入，也可以作为PHP5.0的PECL扩展；PDO需要PHP5核心中的新的面现对象特征，所以不能在以前的版本中运行。

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 data-access 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.

Published by 阿飞 on Jul 25th, 2008 at 08:03 am
Tags: php_pdo