java operation Oracle database

/*

　　@author:luowen

　　@time:2013-11-22

　　@desc:java operation oracle

*/

package com.luowen.OracleTest;



import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;



public class TestOrl {



	public static void main(String[] args){

		// TODO Auto-generated method stub

		Connection ct = null;

		PreparedStatement ps = null;

		ResultSet rs = null;

			try {

				//load driver

				Class.forName("oracle.jdbc.driver.OracleDriver");

				/*	get connection

				 * 	jdbc:oracle:thin:@ip:port

				 * 	user

				 * 	password

				 */

				ct = DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:orcl","scott","tiger");

				//create prepareStatement

				ps = ct.prepareStatement("select count(*) cnt from emp");

				//executeQuery sql return resultSet

				rs = ps.executeQuery();

				

				while(rs.next())

				{

					//print result

					System.out.println(rs.getString("cnt"));

				}

				

			} catch (Exception e) {

				// TODO: handle exception

				e.printStackTrace();

			} finally{

				doException(ct, ps, rs);

				

			}



	}

	private static void doException(Connection ct, PreparedStatement ps,

			ResultSet rs) {

		if(rs != null)

		{

			try {

				rs.close();

			} catch (SQLException e) {

				// TODO Auto-generated catch block

				e.printStackTrace();

			}

			rs = null;

		}

		if(ps != null){

			try {

				ps.close();

			} catch (SQLException e) {

				// TODO Auto-generated catch block

				e.printStackTrace();

			}

			ps = null;

		}

		if(ct != null)

		{

			try {

				ct.close();

			} catch (SQLException e) {

				// TODO Auto-generated catch block

				e.printStackTrace();

			}

			ct = null;

		}

	}



}