Java MySQL 连接

Java MySQL 连接

本章节我们为大家介绍 Java 如何使用 使用 JDBC 连接 MySQL 数据库。

Java 连接 MySQL 需要驱动包,最新版下载地址为:http://dev.mysql.com/downloads/connector/j/,解压后得到 jar 库文件,然后在对应的项目中导入该库文件。



本实例使用的是 Eclipse,导入 jar 包:

MySQL 8.0 以上版本的数据库连接有所不同:

1、MySQL 8.0 以上版本驱动包版本 mysql-connector-java-8.0.16.jar。
2、com.mysql.jdbc.Driver 更换为 com.mysql.cj.jdbc.Driver。
MySQL 8.0 以上版本不需要建立 SSL 连接的,需要显示关闭。
allowPublicKeyRetrieval=true 允许客户端从服务器获取公钥。
最后还需要设置 CST。

加载驱动与连接数据库方式如下:

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

接下来我们在 MySQL 中创建 BFW数据库,并创建 websites 数据表,表结构如下:

Power by bfwstudio
CREATE TABLE `websites` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` char(20) NOT NULL DEFAULT '' COMMENT '',
`url` varchar(255) NOT NULL DEFAULT '',
`alexa` int(11) NOT NULL DEFAULT '0' COMMENT 'Alexa ',
`country` char(10) NOT NULL DEFAULT '' COMMENT '',
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=utf8;
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插入一些数据:

Power by bfwstudio
INSERT INTO `websites` VALUES ('1', 'Google', 'https://www.google.cm/', '1', 'USA'),
('2', '', 'https://www.taobao.com/', '13', 'CN'),
('3', 'java', 'http://www.bfw.wiki', '5892', ''),
('4', '', 'http://weibo.com/', '20', 'CN'),
('5', 'Facebook','https://www.facebook.com/', '3', 'USA');
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连接数据库

以下实例使用了 JDBC 连接 MySQL 数据库,注意一些数据如用户名,密码需要根据你的开发环境来配置:

MySQLDemo.java 文件代码:
Power by bfwstudio
package com.bfw.test;
import java.sql.*;
public class MySQLDemo {
// MySQL 8.0 - JDBC URL
static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
static final String DB_URL = "jdbc:mysql://localhost:3306/BFW";
// MySQL 8.0 - JDBC URL
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