Java使用Jdbc操作MySql数据库(一)

 1 package com.mylx.database;
 2 
 3 public class User {
 4     String id;
 5     String username;
 6     String password;
 7 
 8     public String getId() {
 9         return id;
10     }
11 
12     public void setId(String id) {
13         this.id = id;
14     }
15 
16     public String getUsername() {
17         return username;
18     }
19 
20     public void setUsername(String username) {
21         this.username = username;
22     }
23 
24     public String getPassword() {
25         return password;
26     }
27 
28     public void setPassword(String password) {
29         this.password = password;
30     }
31 }

 1 package com.mylx.database;
 2 //Java使用Jdbc操作MySql数据库(一)
 3 
 4 import java.sql.Connection;
 5 import java.sql.DriverManager;
 6 import java.sql.ResultSet;
 7 import java.sql.SQLException;
 8 import java.sql.Statement;
 9 import java.util.ArrayList;
10 import java.util.List;
11 
12 public class MyDatabaseMySQL {
13 
14     public static void main(String[] args) {
15         String driverStr = "com.mysql.jdbc.Driver";
16         String dataUrlStr = "jdbc:mysql://192.168.2.100:3306/logininfo";
17         String nameStr = "root";
18         String passwordStr = "admin";
19         String sqlStr = "select * from userinfo";
20         Connection conn = null;
21         Statement stat = null;
22         List<User> usersList = new ArrayList<User>();
23         
24         try {
25             //先将mysql-connector-java-5.1.26-bin.jar开发包复制到lib文件夹中
26             //并且Build Path->Add Build Path
27             //加载驱动类
28             Class.forName(driverStr);
29             //创建数据连接
30             conn = DriverManager.getConnection(dataUrlStr, nameStr, passwordStr);
31             //获得查询数据记录集
32             stat = conn.createStatement();
33             ResultSet rs = stat.executeQuery(sqlStr);
34             //遍历记录集，并将各字段数据读取封装到数据集合当中
35             for (rs.first(); !rs.isAfterLast(); rs.next()) {
36                 User tmpUser = new User();
37                 tmpUser.setId(rs.getString(1));
38                 tmpUser.setUsername(rs.getString(2));
39                 tmpUser.setPassword(rs.getString(3));
40                 usersList.add(tmpUser);
41             }
42         } catch (Exception e) {
43             e.printStackTrace();
44         } finally {
45             if (conn != null) {
46                 try {
47                     //关闭连接
48                     conn.close();
49                 } catch (SQLException e) {
50                     e.printStackTrace();
51                 }
52             }
53         }
54         //遍历数据集合并打印输出
55         if (usersList != null) {
56             for (int i = 0; i < usersList.size(); i++) {
57                 System.out.print(usersList.get(i).getId() + "-->");
58                 System.out.print(usersList.get(i).getUsername() + "-->");
59                 System.out.print(usersList.get(i).getPassword() + "\n");
60             }
61         }
62     }
63 }