What are the different type of connections in JDBC ?

What kind of connections are you looking for ?

If you are looking for adapter services then there are Custom, Select, Update, insert, Delete, and Batch services...take a look at JDBC adapters gude.. http://documentation.softwareag.com/webmethods/adapters_estandards/Adapters/JDBC/JDBC_6-5/6-5_JDBC_Adapter_Install_and_Users_Guide.pdf

For transactions follow the below links:

http://idnxchange.com/webmethods-interview-questions/3/94.html

http://idnxchange.com/webmethods-interview-questions/3/95.html

For transaction types check this http://idnxchange.com/webmethods-interview-questions/3/93.html