本文将使用Apache Derby作为客户端数据库。

This article USES Apache Derby as a client-side database.

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检测是否有全局函数opendatabase，这个函数用于创建和访问客户端数据库。

Check for the presence of the global function openDatabase, which is used for creating and accessing client-side databases.

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使用Derby作为嵌入式客户端数据库能够使我们完成单独用Ajax无法完成的操作。

It is the ability to use Derby as an embedded client-side database that enables us to do things that we could not do with Ajax alone.

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