jdbc事务

package jdbc;

import org.junit.Test;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Collection;

public class Test3 {
    @Test
    public void test()  {
        //配置信息
        String url = "jdbc:mysql://localhost:3306/jdbc?useUnicode=true&characterEncoding=utf-8&serverTimezone=PRC";
        String username = "root";
        String password = "";

        Connection conn = null;
        //加载驱动
        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
        //连接数据库，代表数据库
         conn = DriverManager.getConnection(url,username,password);
        //通知数据库开启事务，false 开启
        conn.setAutoCommit(false);
        String sql = "update account set money = money-100 where name = '王五'";
        conn.prepareStatement(sql).executeUpdate();
        //制作错误
        //int i = 1/0;

        String sql2 = "update account set money = money+200 where name = '张三'";
        conn.prepareStatement(sql2).executeUpdate();
        conn.commit();//以上2条sql都执行成功了，就提交事务！
        System.out.println("success");
        } catch (Exception e) {
            try {
                //如果出现异常，就通知数据库回滚事务
                conn.rollback();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
            e.printStackTrace();
        }finally {
            try {
                conn.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }
    }
}