Struts is a MVC framework, not some database connectivity API.
Java SE offers you the
JDBC API for database connectivity. Here is a JDBC tutorial:
http://java.sun.com/docs/books/tutorial/jdbc/index.html To start, create a DAO class where in you takes and returns DTO's (javabeans) and do the JDBC tasks based on it,
test it as an independent Java application. Once you got it to work, then just integrate it in your Struts application the usual way. There is a JDBC forum here devoted to questions related to JDBC.