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Java Derby. How my data are saved?

Hello,

I am following this tutorial : [http://netbeans.org/kb/docs/java/gui-db.html] .

I want to create an apllication in Java, using as database Java DB (Derby).

Does someone know how the data are saved? I need this apllication for a customer, and i woud like if data could be saved in a single file, pretty much like access do.

Secondly, does anyone know if there is an easy way to start Derby?

And, last but not least, following the tutorial mentioned above, i can't use NEW button to create a new record in my database. I can modify a record that is already saved in my database, but i can't create a new one.

Anyone that has an answer at any of my questions please feel free to instruct me.
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