因为我们使用Hibernate作为我们的提供者，我们不能选择非关系型数据库，比如GoogleAppEngine。

Because we are using Hibernate as our provider, we cannot choose a non-relational database like Google App Engine.

youdao

可以用来存储字符串，哈希结构，链表，集合，因此，常用来提供数据结构服务。通常也叫做结构化非关系型数据库。

It is often referred to as a data structure server since keys can contain strings, hashes, lists, sets, sorted sets, bitmaps and hyperloglogs.

youdao

可以用来存储字符串，哈希结构，链表，集合，因此，常用来提供数据结构服务。通常也叫做结构化非关系型数据库。

It is often referred to as a data structure server since keys can contain strings, hashes, lists, sets, sorted sets, bitmaps and hyperloglogs.

youdao