hi Ravissant,
first question:
jdbcracle:thin:@training:1521:Oracle is the URL of your database.
jdbc = connection type
oracle = your database
thin = drivertype
training = machinename
1521 = portnumber
Oracle = databasename
second question: jdbc:odbc:Mydsn_oracle
Mydsn_oracle is the name of your ODBC-datasource
(should be somewhere in settings - control panel - administrative tools)
third question: difference between those two:
The first tries to connect to the database using the Oracle driver, the second one uses the JDBC-ODBC bridge as driver (not meant for production-code)
Hope this helps,
Herman