设计与实现了易查询、易维护、可移植的管理系统。
It is easy to make inquiries with the Management System that is easy to be maintained and migrated.
其次，它消除了易出错的类型强制转换的需要(这是一个在查询操作中比在CRUD中更常见的问题)。
Secondly, it removes the need for error-prone type casts. (a problem more common with query operations than CRUDs.)
另一方面，数据库是一个容 易做一些简单改变（添加一个索引，稍稍修改一个查询）并看到巨大性能改善的地方。
The database, on the other hand, is an easy place to make a few simple changes (add an index, change a query slightly) and see tremendous performance improvements.
如果查询请求的对象易被识别为已检索到的对象，则不会执行查询。
If the object requested by the query is easily identifiable as one already retrieved, no query is executed.
本系统有利于数据的集中、有效管理 ，与手动管理方式相比，占据空间小，易更新、易备份； 与自建文档相比可以高效地实现组合查询。
The concentration that this system is advantageous to the data, valid management, with move to manage the way to compare, occupy the space small, easy renewal, easy backup;
本系统有利于数据的集中、有效管理 ，与手动管理方式相比，占据空间小，易更新、易备份； 与自建文档相比可以高效地实现组合查询。
The concentration that this system is advantageous to the data, valid management, with move to manage the way to compare, occupy the space small, easy renewal, easy backup;
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