Using SQLite with a database abstraction layer.
使用SQLite和数据库抽象层。
PDO does not provide a database abstraction; it doesn't rewrite SQL or emulate missing features.
PDO并不提供数据提取,它不会重写SQL语句,或者模仿这些功能。
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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