JDBC连接数据库8.0

1.导入jar包

2.连接的驱动地址为"com.mysql.cj.jdbc.Driver"

Class.forName("com.mysql.cj.jdbc.Driver"); 

3.创建连接（修改）

        Connection conn= DriverManager.getConnection("jdbc:mysql://localhost:3306/a?characterEncoding=utf8&useSSL=false&serverTimezone=UTC&rewriteBatchedStatements=true","root"
        ,"123456");

4.定义sql

String sql="update account set balance=balance+500 where id=1";

5.获取执行sql的对象 stmt

Statement stmt = con.createStatement();

6.执行sql

int count = stmt.executeUpdate(sql);