Now you can find out how to manipulate a simple Derby database by extending the plug-in to provide a simple records counter for the records table of the local database.
The same problem of extending old functions to new types, and new functions to old types - extending Wadler's table in both directions - remains.
将旧函数扩展到新类型和将新函数扩展到旧类型的问题—在两个方向上扩展Wadler的表—仍然存在。
3
Finally, by extending the synchronization system based on control table and applying the dependence model, the performance in parallel is improved greatly.