JDBC API is a Java API that can access any kind of tabular data, especially data stored in a Relational Database. JDBC works with Java on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX.
This tutorial is designed for Java programmers with a need to understand the JDBC framework in detail along with its architecture and actual usage. This tutorial will bring you at intermediate level of expertise from where you can take yourself at higher level of expertise.
Before proceeding with this tutorial you should have a good understanding of Java programming language. Because you are going to deal with RDBMS, so it is required that you have good understanding on SQL and Database concepts.
1 - JDBC Quick Reference Guide
A quick JDBC reference guide for JDBC Programmers.
2 - JDBC Useful Resources
A collection of JDBC Sites, Books and Articles is given at this page.
3 - Java Tutorials
If you are starting with Java then it's best place to start with:
4 - JDBC Tutorial in PDF
Download a quick JDBC tutorial in PDF format.