testing
Modifications in regard to David's comment and suggestion

Added a common project for DBhandler, used preparedstatment to avoid
Sql injection attack, and added some other minor changes.
Merge branch 'master' of github.com:hiuwing/jmxdatamart
Merge pull request #18 from hiuwing/master

Modifications in regard to David's comment and suggestion
Merged 8c316317f6179cca4f5c66aad6eb29b19f5e8541 from TeamDewberry