java operation Oracle database

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/*
  @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;
        }
    }
 
}
  

  

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