Connect to an Oracle database with JDBC in Java

JDBC mean Java Database Connectivity. In java, using JDBC drivers, we can connect to database.
Steps to connect to JDBC.
1) Load the driver, using Class.forName(DriverName);
2) Get the connection object, Connection con = Driver.getConnection(loaded driver name);
3) Create a SQL statement, Statement s = con.createStatement();
4) Create Resultset object using the statement created above, ResultSet rs = s.executeQuery("sql statement");

Iterate the result set to get all the values from the database.

Finally don't miss this
5) s.close();
6) con.close() ;

Example:

import java.sql.*;

public class TestDBOracle {

  public static void main(String[] args)
      throws ClassNotFoundException, SQLException
  {
    Class.forName("oracle.jdbc.driver.OracleDriver");
    //
    // or
    // DriverManager.registerDriver
    //        (new oracle.jdbc.driver.OracleDriver());

        String url = "jdbc:oracle:thin:@//server.local:1521/prod";
    //               jdbc:oracle:thin:@//host:port/service
    // or
    // String url = "jdbc:oracle:thin:@server.local:1521:prodsid";
    //               jdbc:oracle:thin:@host:port:SID
    //
    //  SID  - System ID of the Oracle server database instance.
 //         By default, Oracle Database 10g Express Edition
 //         creates one database instance called XE.
 //         ex : String url = "jdbc:oracle:thin:@myhost:1521:xe";



    Connection conn =
         DriverManager.getConnection(url,"scott","tiger");

    conn.setAutoCommit(false);
    Statement stmt = conn.createStatement();
    ResultSet rset =
         stmt.executeQuery("select BANNER from SYS.V_$VERSION");
    while (rset.next()) {
         System.out.println (rset.getString(1));
    }
    stmt.close();
    System.out.println ("Ok.");
  }
}