简要回顾一下清单 4，您在那里将数据表的数据源定义为控制器，那意味着控制器有一些数据源方法需要实现，如 清单 6 所示。
Return briefly to Listing 4, where you defined the data source for the table as the controller. This means that the controller has some data source methods to implement; Listing 6 shows those.
如果数据表被允许增长太大，那么存储费用可能会无法控制。
If tables are allowed to grow too large, storage fees could start to add up.
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