一次编写，随处运行
| ML schema file from an existing database. A very simple front end can be found in the MDB package: the reverse_engineer_xml_schema.php script. Most likely you will need to manually fix the resulting XML schema file, but it will give you a nice starting point. 第二个区别通过观察 wrapper 可以轻易的被解决。如你再 wrapper 中能看到的，你可以再 MDB 期望得到结果集的数据类型的地方简单地传递 NULL。现在，你地程序应当能够使用 MDB。当然，你现在没有真正得到了 MDB 地高级特性优点的益处。这最有可能的是需要对你当前的数据库 schema 进行一些改动。管理器能够尝试反向地从已经存在的数据库中获取 XML schema 文件。一个非常简单的前端可以在 MDB 包中找到：reverse_engineer_xml_schema.php 脚本。极有可能你将需要手动修正产生的 XML schema 恩见，但是它将给你一个很好的开始。 If you want to port your existing application from Metabase to MDB you will have to change all of your function calls. Looking at the Metabase wrapper it will become quite obvious what changes need to be made. If you know regular expressions well you might even be able to get most of the work done with a few such replacements. Anyways, you should be up and running your old beloved advanced abstraction features but now using MDB in no time. What you will probably notice is that the method names are much shorter now. If you do some benchmarking you will also see a nice performance increase. So what does the future look like for MDB? At the time this article publishes MDB will have moved on from the original 1.0 release. Next to the original MySQL and PostGreSQL drivers MDB will also have an ODBC driver and possibly even more drivers. This is one key area that is focused on during the development of MDB. Once MDB has caught up with PEAR DB in terms of drivers it is likely to become the standard database abstraction layer in the PEAR framework. But there is another key area of development: the MDB_frontend project. The MDB_frontend will be a phpMyAdmin like webfrontend based on MDB and the MDB manager. With this tool you will be able to browse databases stored on any RDBMS that MDB supports. The MDB_frontend will show both the native and the MDB data types. Emulated features such as sequences in MySQL will be hidden. The user will simply see a list of sequences and not a table storing the value of the sequence which is how sequences are emulated in MySQL. Furthermore the MDB_frontend will assist in |
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