数据库事务的问题

需要实现在user_table表中AA给BB转账1000

AA.balance-1000同时BB.balance+1000

两个事情必须要么执行，要么不执行，这就是事务

没有加事务的做法：

public static void updateCustomer(String sql,Object... args){
        Connection connection = null;
        PreparedStatement ps = null;
        try {
            connection = JDBCUtils.getConnection();
            ps = connection.prepareStatement(sql);
            for(int i=0;i<args.length;i++){
                ps.setObject(i+1,args[i]);
            }
            ps.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            JDBCUtils.closeResource(connection,ps);
        }
    }

@Test
    public void test01(){

        String sql1="update user_table set balance=balance-1000 WHERE `user`=?";
        Common.updateCustomer(sql1,"AA");

        System.out.println(10/0);
        String sql2="update user_table set balance=balance+1000 WHERE `user`=?";
        Common.updateCustomer(sql2,"BB");

        System.out.println("转账成功");
    }

考虑事务以后的代码实现update：

public static void updateCustomerTx(Connection connection,String sql,Object... args){
        PreparedStatement ps = null;
        try {
            ps = connection.prepareStatement(sql);
            for(int i=0;i<args.length;i++){
                ps.setObject(i+1,args[i]);
            }
            ps.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            JDBCUtils.closeResource(null,ps);
        }
    }

@Test
    public void test2()  {
        Connection connection=null;
        try {
            connection = JDBCUtils.getConnection();
            System.out.println("连接的默认提交方式：" + connection.getAutoCommit());
            connection.setAutoCommit(false);
            String sql1 = "update user_table set balance=balance-1000 WHERE `user`=?";
            Common.updateCustomerTx(connection, sql1, "AA");
            System.out.println(10/0);
            String sql2 = "update user_table set balance=balance+1000 WHERE `user`=?";
            Common.updateCustomerTx(connection, sql2, "BB");
            System.out.println("转账成功");
            connection.commit();
        } catch (Exception e) {
            try {
                connection.rollback();
            } catch (SQLException e1) {
                e1.printStackTrace();
            }
            e.printStackTrace();
        } finally {
        connection.setAutoCommit(false);
            JDBCUtils.closeResource(connection,null);
        }

    }