DB1

import java.sql.*;

public class Database {
    public static void main(String[] args) {

        try {
            // step1 load the driver class
            Class.forName("oracle.jdbc.driver.OracleDriver");

            // step2 create the connection object
            Connection con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe", "system", "system");

            // step3 create the statement object
            Statement stmt = con.createStatement();

            // For inserting Data
            // ----------------------
            // Statement insertQuery = con.createStatement();
            // insertQuery.executeQuery("INSERT INTO emp (ID, Name, Age) VALUES (3, 'Vikas', 23)");
            // ----------------------

            // step4 execute query
            ResultSet rs;
            rs = stmt.executeQuery("SELECT * FROM emp");

            while (rs.next()) {
                System.out.println(rs.getInt(1) + "  " + rs.getString(2) + "  " + rs.getInt(3));
            }

            // step5 close the connection object
            con.close();

        }
        catch (Exception e) {
            System.out.println(e);
        }

    }

}