import java.sql.*;

public class testDB{
  public static void main(String[] args){
    String serverName="127.0.0.1";
    try{
      Class c=oracle.jdbc.driver.OracleDriver.class;
      String url="jdbc:oracle: @"+serverName+":1521: XE";
      Connection conn=DriverManager.getConnection(url,"12345","12345");
      Statement stmt=conn.createStatement();
      ResultSet rs=stmt.executeQuery("select * from user_db");
      while(rs.next()){
        System.out.print("id:"+rs.getString(1));
        System.out.println("name:"+rs.getString(2));
      }
      rs.close();
      stmt.close();
      conn.close();
    }catch(SQLException sqle){
      System.out.println("database is error.~~~~~~~~~~~~!!!!");
      sqle.printStackTrace();
    }catch(Exception e){
      e.printStackTrace();
    }
    
  }
}