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how to migrate Grail’s HSQLDB embedded database(That contains my App’s Data that I don’t want to lose) into external one, such as MySQL or ApacheDerby?
The MySQL Migration Toolkit may be exactly what you need.
A little searching turned up this article that shows examples of what the GUI Tool looks like.
I haven’t had to migrate data from a HSQLDB to any other DB, but if I had data that I didn’t want to use in a HSQLDB then I’d definitely try this method.
HSQLDB database that you want to save
(I’m assuming you used a file DB
rather than an in-memory one right?)
datasource with the dbCreate set to
update (or something non-destructive)
your data
Otherwise you ought to be able to view the data in your DB by using another tool (DBVisualizer, RazorDB, or others) and they might be able to help you export the data.