如何从数据库中存储对象？

Question

I am developing a java application which will be graphically depicting and organizing hundreds of objects. Each of these objects is loaded in from a SQL database, for use in this program.

I plan to keep a local copy of all the data, retrived through a JDBC connection, and then sort it locally (Likely with Merge Sort as that is my favorite)

How would you recommend I store the data locally? Ideally, it would be very easy to traverse, sort and compare to the source Database.

Currently, I have objects called Ideas which are populated from the database. Then, to display them, I create the same number of IdeaGraphics objects and add them to the appropriate JPanels. This can be quite slow at times.

Answer 1

您可以实现Comparator接口并使用Collections.sort()修改的归并，如图所示这里 。

Answer 2

Maybe you already did that but it's not so clear in your question:

You can get almost as many instances of your data class (Ideas) but it's not the same at all with graphic classes. Limit the number of widgets and graphics to 1.

Build your own custom JPanel class, give it a list of Ideas and override the paintComponent method to draw all items in the list.

If your visible area is large, double buffer it.

Answer 3

I disagree with that and not good idea to holding lots of data in local Memory, with idea to simulate, excelent optimalized preprocesor from Sql Engine (most of todays engines), then basically faster as best EndUser PC

and if you have some WHATEVER permisions to the Database, then there are still exist option(s) to loading data from DbEngine to the Embedded database (on Memory), maybe to H2 or maybe JavaDB