The JDBC specification and API documentation provided by Sun Microsystems, Inc. are the ultimate sources of information for JDBC. The following links take you directly to Sun Microsystems' website:

JDBC Technology Homepage
JDBC API Specification
JDBC API Documentation

There are many good JDBC books on the market. We suggest searching Amazon.com or visiting your local bookstore to peruse a list of titles. However, we believe that the one essential book for all JDBC programmers is:

JDBC API Tutorial and Reference, 3rd Edition
by Fisher, Ellis, & Bruce, Addison-Wesley, 2003