Java代码
1. package com.hu.demo;
2.
3. import java.sql.Connection;
4. import java.sql.DriverManager;
5. import java.sql.PreparedStatement;
6. import java.sql.SQLException;
7.
8. public class DBHelper {
1. //不同的数据库 URL写法不同
2. jdbc:mysql://IP/student 连接的用户不同
9. public static final String url = "jdbc:mysql://127.0.0.1/student";
10. public static final String name = "com.mysql.jdbc.Driver";
11. public static final String user = "root";
12. public static final String password = "root";
13.
14. public Connection conn = null;
15. public PreparedStatement pst = null;
16.
17. public DBHelper(String sql) {
18. try {
19. Class.forName(name);//指定连接类型
20. conn = DriverManager.getConnection(url, user, password);//获取连接
21. pst = conn.prepareStatement(sql);//准备执行语句
22. } catch (Exception e) {
23. e.printStackTrace();
24. }
25. }
26.
27. public void close() {
28. try {
29. this.conn.close();
30. this.pst.close();
31. } catch (SQLException e) {
32. e.printStackTrace();
33. }
34. }
35. }
再写一个Demo.java来执行相关查询操作
Demo.java
Java代码
1. package com.hu.demo;
2.
3. import java.sql.ResultSet;
4. import java.sql.SQLException;
5.
6. public class Demo {
7.
8. static String sql = null;
9. static DBHelper db1 = null;
10. static ResultSet ret = null;
11.
12. public static void main(String[] args) {
13. sql = "select *from stuinfo";//SQL语句
14. db1 = new DBHelper(sql);//创建DBHelper对象
15.
16. try {
17. ret = db1.pst.executeQuery();//执行语句，得到结果集
18. while (ret.next()) {
19. String uid = ret.getString(1);
20. String ufname = ret.getString(2);
21. String ulname = ret.getString(3);
22. String udate = ret.getString(4);
23. System.out.println(uid + "\t" + ufname + "\t" + ulname + "\t" + udate );
24. }//显示数据
25. ret.close();
26. db1.close();//关闭连接
27. } catch (SQLException e) {
28. e.printStackTrace();
29. }
30. }
31.
32. }
|
|
收藏
淘帖
踩
