This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
I don' think that ODBC can be used to alter Excel files - it can only read them. Either find a different Excel JDBC driver that can do this (although I doubt such a driver exists), or use a library like jExcelApi or Apache POI to alter the file programmatically.