you must connect to your source using a JDBC driver. I think there are JDBC drivers available to be used with CSV. Otherwise you'll have to copy your CSV data into a database first.
Benjamin
PS: The open source database HSQLDB seems to support the use of CSV files without copying the data first: http://hsqldb.org/doc/guide/ch06.html I have never tried it. If you do, let me know how it worked.
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