Using SQLite with a database abstraction layer.

使用SQLite和数据库抽象层。

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Drupal is written on top of a database abstraction layer, so the framework can be easily extended to other database back ends.

Drupal是在数据库抽象层上编写的，所以框架可以轻松地扩展到其他数据库后端。

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MDB is a database abstraction layer that aims to make writing RDBMS independent PHP application development a straightforward process.

MDB 是着眼于使得编写 RDBMS 无关的 PHP 程序成为简单的过程的数据库抽象层。

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