Hi
JDBC is not a separate database. Its called Java Data base conectivity.
Java uses JDBC API to talk to any database like oracle,SQL,DB2 etc.,
You can execute SQL queries using JDBC. A typical JDBC code looks like below
Connection con = DriverManager.getConnection
( "jdbc:myDriver:wombat", "myLogin","myPassword");
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("SELECT a, b, c FROM Table1");
while (rs.next()) {
int x = rs.getInt("a");
String s = rs.getString("b");
float f = rs.getFloat("c");
}
For more details kindly go through this link
http://java.sun.com/docs/books/tutorial/jdbc/