使用ResultSet结果集查询数据

直接上下代码:

 1 package com.learn.jdbc.chap05;
 2 
 3 import java.sql.Connection;
 4 import java.sql.PreparedStatement;
 5 import java.sql.ResultSet;
 6 import java.util.ArrayList;
 7 import java.util.List;
 8 
 9 import com.learn.jdbc.model.Album;
10 import com.learn.jdbc.util.DbUtil;
11 /**
12  * 使用ResultSet结果集(数据查询)
13  * @author Administrator
14  *
15  */
16 public class Demo1 {
17     
18     private static DbUtil dbUtil=new DbUtil();
19     
20     private static void listAlbum() throws Exception{
21         Connection con = dbUtil.getCon();
22         String sql="select * from sp_album";
23         PreparedStatement pstmt = con.prepareStatement(sql);
24         ResultSet rs = pstmt.executeQuery(); // 返回结果集 ResultSet
25         while(rs.next()){
26             // 下面的写法 在工作中 很少用
27             int id=rs.getInt(1);
28             String name=rs.getString(2);
29             int uid=rs.getInt(3);
30             long time=rs.getLong(4);
31             System.out.println("编号:"+id+",名称:"+name+",会员id:"+uid+",添加时间:"+time);
32             System.out.println("-----------------------");
33         }
34         
35     }
36     
37     private static void listAlbum2() throws Exception{
38         Connection con = dbUtil.getCon();
39         String sql="select * from sp_album";
40         PreparedStatement pstmt = con.prepareStatement(sql);
41         ResultSet rs = pstmt.executeQuery(); // 返回结果集 ResultSet
42         while(rs.next()){
43             // 下面的写法 在工作中 经常这么写
44             int id=rs.getInt("id");
45             String name=rs.getString("name");
46             int uid=rs.getInt("uid");
47             long time=rs.getLong("add_time");
48             System.out.println("编号:"+id+",名称:"+name+",会员id:"+uid+",添加时间:"+time);
49             System.out.println("-----------------------");
50         }
51         
52     }
53     
54     private static List<Album> listAlbum3() throws Exception{
55         List<Album> albumList = new ArrayList<Album>();
56         
57         Connection con = dbUtil.getCon();
58         String sql="select * from sp_album";
59         PreparedStatement pstmt = con.prepareStatement(sql);
60         ResultSet rs = pstmt.executeQuery(); // 返回结果集 ResultSet
61         while(rs.next()){
62             // 下面的写法 在工作中 经常这么写
63             int id=rs.getInt("id");
64             String name=rs.getString("name");
65             int uid=rs.getInt("uid");
66             long time=rs.getLong("add_time");
67             
68             Album ab=new Album(id, name, uid, time);
69             albumList.add(ab);
70         }
71         
72         return albumList;
73     }
74     
75     public static void main(String[] args) throws Exception {
76         /*listAlbum();
77         System.out.println("=============================================");
78         listAlbum2();*/
79         List<Album> abInfo = listAlbum3();
80         for(Album abm:abInfo){ // 此处的abm默认输出是调用父类的toString方法,要输出自定义信息,需要重写toString方法
81             System.out.println(abm);
82             //System.out.println(abm.getName());
83         }
84     }
85 }
原文地址:https://www.cnblogs.com/eaglezb/p/6055317.html