Class.forName("com.mysql.cj.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test_demo?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=UTC","root","password");

CREATE TABLE `websites` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` char(20) NOT NULL DEFAULT '' COMMENT '站點名稱',
  `url` varchar(255) NOT NULL DEFAULT '',
  `alexa` int(11) NOT NULL DEFAULT '0' COMMENT 'Alexa 排名',
  `country` char(10) NOT NULL DEFAULT '' COMMENT '國家',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=utf8;

INSERT INTO `test_demo`.`websites` (`id`, `name`, `url`, `alexa`, `country`) VALUES ('1', 'Google', 'https://www.google.cm/', '1', 'USA');
INSERT INTO `test_demo`.`websites` (`id`, `name`, `url`, `alexa`, `country`) VALUES ('2', '淘寶', 'https://www.taobao.com/', '13', 'CN');
INSERT INTO `test_demo`.`websites` (`id`, `name`, `url`, `alexa`, `country`) VALUES ('3', 'java入門', 'https://blog.csdn.net/wwwzhouzy/category_11249888.html', '5892', '');
INSERT INTO `test_demo`.`websites` (`id`, `name`, `url`, `alexa`, `country`) VALUES ('4', '微博', 'http://weibo.com/', '20', 'CN');
INSERT INTO `test_demo`.`websites` (`id`, `name`, `url`, `alexa`, `country`) VALUES ('5', 'Facebook', 'https://www.facebook.com/', '3', 'USA');

package com.zhouzy.base.t11;
import java.sql.*;

public class MysqlTest {
	 // MySQL 8.0 以下版本 - JDBC 驅(qū)動名及數(shù)據(jù)庫 URL
    static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";  
    static final String DB_URL = "jdbc:mysql://localhost:3306/test_demo";
    // MySQL 8.0 以上版本 - JDBC 驅(qū)動名及數(shù)據(jù)庫 URL
    //static final String JDBC_DRIVER = "com.mysql.cj.jdbc.Driver";  
    //static final String DB_URL = "jdbc:mysql://localhost:3306/RUNOOB?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=UTC";
 
    // 數(shù)據(jù)庫的用戶名與密碼，需要根據(jù)自己的設(shè)置
    static final String USER = "root";
    static final String PASS = "123456";
    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;
        try{
            // 注冊 JDBC 驅(qū)動
            Class.forName(JDBC_DRIVER);
            // 打開鏈接
            System.out.println("連接數(shù)據(jù)庫...");
            conn = DriverManager.getConnection(DB_URL,USER,PASS);
            // 執(zhí)行查詢
            System.out.println(" 實例化Statement對象...");
            stmt = conn.createStatement();
            String sql;
            sql = "SELECT id, name, url FROM websites";
            ResultSet rs = stmt.executeQuery(sql);
            // 展開結(jié)果集數(shù)據(jù)庫
            while(rs.next()){
                // 通過字段檢索
                int id  = rs.getInt("id");
                String name = rs.getString("name");
                String url = rs.getString("url");
                // 輸出數(shù)據(jù)
                System.out.print("ID: " + id);
                System.out.print(", 站點名稱: " + name);
                System.out.print(", 站點 URL: " + url);
                System.out.print("\n");
            }
            // 完成后關(guān)閉
            rs.close();
            stmt.close();
            conn.close();
        }catch(SQLException se){
            // 處理 JDBC 錯誤
            se.printStackTrace();
        }catch(Exception e){
            // 處理 Class.forName 錯誤
            e.printStackTrace();
        }finally{
            // 關(guān)閉資源
            try{
                if(stmt!=null) stmt.close();
            }catch(SQLException se2){
            }// 什么都不做
            try{
                if(conn!=null) conn.close();
            }catch(SQLException se){
                se.printStackTrace();
            }
        }
        System.out.println("再見!");
    }
}