示例代码：

package com.fdw.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class TestJdbc3 {
    public static void main(String[] args) {
        //配置信息
        String url ="jdbc:mysql://localhost:3306/mybatis?useSSL=false&useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai";
        String username = "root";
        String password = "root";
        Connection connection =null;
        //1.加载驱动
        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
            //2.连接数据库
            connection = DriverManager.getConnection(url, username, password);
            //开启事务
            connection.setAutoCommit(false);
            //3.编写SQl
            String sql1 = "update user set name = '哇哈哈哈1' where id=1";
           connection.prepareStatement(sql1).executeUpdate();

           //制造错误
           // int i =1/0;

            String sql2 = "update user set name = '哈哈哈哇' where id=2";
            connection.prepareStatement(sql2).executeUpdate();
            //提交
            connection.commit();
            System.out.println("执行完毕！");

        } catch (Exception e) {
            try {
                //回滚
                connection.rollback();
            } catch (SQLException e1) {
                e1.printStackTrace();
            }
            e.printStackTrace();
        }finally {
            try {
                connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }








    }

}