用Intellij Idea创建一个普通的Java工程并用JDBC连接数据库

 1 import java.sql.*;
 2 
 3 public class DBTest {
 4     //mysql驱动包名
 5     private static final String DRIVER_NAME = "com.mysql.jdbc.Driver";
 6     //数据库连接地址
 7     private static final String URL = "jdbc:mysql://localhost:3306/kettle";
 8     //用户名
 9     private static final String USER_NAME = "root";
10     //密码
11     private static final String PASSWORD = "123456";
12     public static void main(String[] args){
13         Connection connection = null;
14         try {
15             //注册mysql驱动
16             Class.forName(DRIVER_NAME);
17             //获取数据库连接对象
18             connection = DriverManager.getConnection(URL, USER_NAME, PASSWORD);
19             //创建sql执行对象；mysql查询语句
20             String sql = "SELECT * FROM stu";
21             //执行sql命令，返回结果集
22             PreparedStatement prst = connection.prepareStatement(sql);
23             //处理结果集，依次关闭结果集
24             ResultSet rs = prst.executeQuery();
25             while (rs.next()) {
26                 System.out.println("用户名:" + rs.getString("id"));
27                 System.out.println("用户名:" + rs.getString("name"));
28                 System.out.println("用户名:" + rs.getString("phone"));
29             }
30             rs.close();
31             prst.close();
32         } catch (Exception e) {
33             e.printStackTrace();
34         }finally {
35             if (connection != null) {
36                 try {
37                     connection.close();
38                 } catch (SQLException e) {
39                     e.printStackTrace();
40                 }
41             }
42         }
43     }
44 }