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.
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.
If your data isn t important just let hibernate regenerate your schema, else try this: http://www.grails.org/plugin/liquibase
Because grails uses hibernate underneath, no migration is necessary. All you need to do is repoint your confDataSources.groovy to the new database, and next time you startup, it will create tables in the new DB.
See section 3.3 in this doc for more information on MySQL config.
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