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一次编写，随处运行(3) MDB 是怎样出现的？
Back in fall 2001, I was looking for a database abstraction package that would make my companies application framework RDBMS independent. The goal was to reduce database specific code to zero. The only package I found that offered such features was Metabase. But Metabase had a somewhat uncomfortable API that was partly a result of the compatibility to PHP3. This also made Metabase slower than it needed to be for our purposes, since we did not need PHP3 compatibility. Nonetheless, we decided that Metabase is our only option. But even after adding a performance enhancing patch to Metabase we felt that we were giving up too much performance. We met with the author of Metabase at the International PHP Conference 2001 and we talked about the benefits of having something like Metabase as part of the PEAR project. Shortly afterwards a discussion began once more in the PEAR mailing list about the potential benefits of a merge of PEAR DB and Metabase. After much discussion at my company we decided to take up this task. After several months of hard work we now have the first stable release of MDB.
早在 2001 年的秋天，我就在寻找一种可能能够让我公司的程序框架与 RDBMS 独立的数据库抽象包。这个目标是把特定数据库相关的代码数量减少到零。我发现提供这样的功能的唯一的一个包是 Metabase。但是 Metabase有一些部分是因为为了和 PHP3 兼容的让人不舒服的 API。尽管如此，我们决定 Metabase 是我们唯一的选择。但是即使是在给 Metabase 增加了一个性能改进的补丁之后，我们仍然感到我们放弃了太多的性能。我们在 2001 年的 PHP 国际会议上碰到了 Metabase 的作者，并且我们谈论了让像 Metabase 这样的东西成为 PEAR 工程一部分的好处。后来不久，在 PEAR 邮件列表上就 PEAR DB 和 Metabase 融合的可能的好处又开始了一场讨论。在我们公司进行了许多讨论之后，我们决定承担这个任务。数个月的艰辛工作之后，我们现在有了 MDB 的第一个稳定的 release。
What does MDB do for you?
MDB 给你提供了什么？
MDB combines most of the features of PEAR DB and Metabase. Actually, the only feature that is missing is PEAR DB's feature of returning an object as a result set. This feature was dropped because the feature's usage never became abundant but the performance penalty was quite apparent. A lot of development time was spend on making the API as intuitive as possible as well. Finally, MDB provides this functionality at a very high level of performance that is at least as fast as PEAR DB and much faster than Metabase. Here is the list of the most important features:
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