如 图 10 所示，这个模式扩展了其他模式，它允许用户更新主数据集和辅助数据集，或者创建在后端系统上的持久化新记录。
This pattern, shown in figure 10, extends the other patterns by enabling a user to update primary and secondary data sets or to create new records that are persisted on back-end systems.
由于对于每个记录只需处理少量的数据，这种查询可以很好地进行扩展。
Because you're dealing with a small amount of data for each record, this kind of query scales pretty well.
扩展应用事件的一个例子就是在启动时向数据库增加新的记录。
An example of extending the application events is to add new records into the database at the bootstrap time.
应用推荐