PDA Application Connect to Database

Hi,
I want to develop application sit on PDA(like iPAQ) eg.Contact Manager (to keep personal contact). this require a database to keep all these information in the PDA so that can be retrieve.
Its there any Micro-Database that can be installed into PDA (free?).
Please show me the link to get this Installaler, JDBC and documentation.
Please show me also the way to create database and table in PDA. and step to install this micro-db into the PDA.
It would be more helpful, if someone can give me some simple example of a PDA Application connect to Database.
Thanks in advance, Regards

Open source one is :
http://sourceforge.net/projects/hsqldb
This one is not absolute free but the price is quite compelling.$995 for unlimited install.
http://www.quadcap.com/home.html
http://www.quadcap.com/purchase/index.html
4. The rights granted pursuant to this Agreement are contingent upon Licensee's payment of the license fees for the QED Software. The License Fee for this Commercial Redistribution License is USD $995.
Even SQL CE from MS is free, as long as you not use it connected to backend system. so if u could work out other sync implementation or u dont need data sync at all, this might be a choice too. The issue is no official JDBC driver for SQL CE though there is for SQL server.
However, I have no hand on experience on those 3. We are evaluating Pointbase Micro, thought not free.l

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