数据库驱动:如声卡、显卡一样,安装后需要驱动。Java连接数据库时候需要下载驱动
1、驱动jar包下载
链接:https://pan.baidu.com/s/1vZNwxkKipaUvOJ_Hn4j2fQ
提取码:zwzs
2、导入jar包
目录名为:lib
导入包
接下来创建数据库:
最后编写Java代码连接:
package JDBC; import java.sql.*; public class Demo1 { public static void main(String[] args) throws ClassNotFoundException, SQLException { //加载驱动 Class.forName("com.mysql.cj.jdbc.Driver"); //用户信息和URL String url="jdbc:mysql://localhost:3306/jdbcstudent?useUnicode=true&useSSL=true&characterEncoding=utf8&serverTimezone=GMT%2B8"; String username="root"; String password="123456"; //连接成功,数据库对象 Connection connection=DriverManager.getConnection(url,username,password); //执行sql对象 Statement statement=connection.createStatement(); String sql="select * from users"; ResultSet resultSet=statement.executeQuery(sql); while (resultSet.next()){ System.out.println("id="+resultSet.getObject("id")); System.out.println("name="+resultSet.getObject("name")); System.out.println("password="+resultSet.getObject("password")); System.out.println("birthday="+resultSet.getObject("birthday")); } //释放连接 resultSet.close(); statement.close(); connection.close(); } }
注意: 1、若是版本低的MySQL文件安装版本高的驱动程序:需要加 .cj
//加载驱动 Class.forName("com.mysql.cj.jdbc.Driver");
2、若是运行出现这个错误:
Exception in thread "main" java.sql.SQLException: The server time zone value '�й���ʱ��' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the 'serverTimezone' configuration property) to use a more specific time zone value if you want to utilize time zone support.
只需要: 在URL中加入 &serverTimezone=GMT%2B8
运行结果如下:
id=1 name=zhangsan password=123456 birthday=1980-12-04 id=2 name=lisi password=123456 birthday=1981-12-04 id=3 name=wangwu password=123456 birthday=1979-12-04