JAVA的列表上移下移操作实现

这里的currentTypePriority 表示当前移动的排序值

nextTypePriority表示要移动的后一个排序值

比如 1、2、3、4、5

2要移动到5前面 =》1、3、4、2、5

那么这里的

currentTypePriority：2

nextTypePriority：5

if (currentTypePriority > nextTypePriority) {
            //上移
            update(
                    Wrappers.lambdaUpdate(Menu.class)
                            .setSql(" priority=priority+1")
                            .ge(Menu::getPriority, nextTypePriority)
                            .lt(Menu::getPriority, currentTypePriority)
            );
        } else {
            //下移
            update(
                    Wrappers.lambdaUpdate(Menu.class)
                            .setSql(" priority=priority-1")
                            .ge(Menu::getPriority, currentTypePriority)
                            .lt(Menu::getPriority, nextTypePriority)
            );
            nextTypePriority=nextTypePriority-1;
        }


        //修改自己
        currentType.setPriority(nextTypePriority);
        updateById(currentType);