Are you asking about how to read/write CSV files, or how to to use JDBC to access a database? If the former, have a look at the various CSV-handling libraries listed here in the "Excel" category.
You can's save CSV file into a database directly, or read from a database directly into a CSV file. Do it in two steps: first read the file into memory (using one of the libraries mentioned in the page I linked to), and then add JDBC code to store the data in the database. Same for reading the data: first read it from the database, and then store it in a file.
[ UD: Please don't post unrelated questions into an existing topic. That's called "hijacking" and generally frowned upon. Please start a new thread instead. ] [ March 20, 2008: Message edited by: Ulf Dittmer ]
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