换句话说,当数据库中没有存储Mood实例时,如果在数据库上运行一个基于已有的Person的查询,db4o将如何作出响应(见清单5)?
In other words, how will db4o react if I run an existing Person-based query against the database when no Mood instances are stored (shown in Listing 5)?
通过基于字符串或动态构建的查询选择实例。
Selecting instances by string-based or dynamically constructed query.
华中科技大学数字校园主校区查询系统就是基于分布式多媒体数据库的实例系统。
HUST Digital Campus main section Query system is the instance system based on the distributing multimedia database.
应用推荐