The Java Database Connectivity (JDBC) API lets you invoke SQL commands from Java programming language methods. You use the JDBC API in an enterprise bean when you have a session bean access the database. You can also use the JDBC API from a servlet or a JSP page to access the database directly without going through an enterprise bean.
The JDBC API has two parts:
An application-level interface used by the application components to access a database
A service provider interface to attach a JDBC driver to the Java EE platform