关于置顶上移下移功能

sql实现：

-- 注意：以下是通过desc顺序示例的，如果是asc，下面sql取反

一、--全表desc的sql示例：

 --mysql查询方式：
select * from column_manage where id>4 ORDER BY id asc LIMIT 1 -- 上移

select * from column_manage where id<4 ORDER BY id desc LIMIT 1  -- 下移

select * from column_manage where id>4 ORDER BY id desc LIMIT 1  -- 置顶

--sqlserve查询方式：

--上移
with tabs  as (select id,title,publish_time,sort,is_delete,row_number() over (order by id asc)rows
from column_manage where is_delete=0 and id>3)
select * from tabs   where rows = 1
--下移
with tabs  as (select id,title,publish_time,sort,is_delete,row_number() over (order by id desc)rows
from column_manage where is_delete=0 and id<3)
select * from tabs   where rows = 1
-- 置顶
with tabs  as (select id,title,publish_time,sort,is_delete,row_number() over (order by id desc)rows
from column_manage where is_delete=0 and id>3)
select * from tabs   where rows = 1


二、--全表asc的sql示例：

--mysql查询方式：
select * from column_manage where id<5 ORDER BY id desc LIMIT 1 -- 上移

select * from column_manage where id>4 ORDER BY id asc LIMIT 1  -- 下移

select * from column_manage where id<6 ORDER BY id asc LIMIT 1  -- 置顶

--sqlserve查询方式：

-- 上移
with tabs  as (select id,title,publish_time,sort,is_delete,row_number() over (order by id desc)rows
from column_manage where is_delete=0 and id<3)
select * from tabs   where rows = 1
--下移
with tabs  as (select id,title,publish_time,sort,is_delete,row_number() over (order by id asc)rows
from column_manage where is_delete=0 and id>3)
select * from tabs   where rows = 1
--置顶
with tabs  as (select id,title,publish_time,sort,is_delete,row_number() over (order by id asc)rows
from column_manage where is_delete=0 and id<3)
select * from tabs   where rows = 1

Service层业务代码：
前端传当前id，通过标识来区分置顶上移下移的操作，前面sql是通过当前的id查询上下置顶的数据，把上下置顶的数据id与当前的数据id 交换就行了

//	操作标识：0->置顶，1->上移，2->下移

 if (columnManagePrm.getFlag() == 0){
            ColumnManagePo invertCurrent = columnManageMapper.selectOne(new QueryWrapper<ColumnManagePo>().eq("id", id));
            ColumnManagePo invertTop = columnManageMapper.findTopColumnManage(invertCurrent.getId());
            if (invertTop == null){
                return HttpResult.success(400, "已经到顶了，不能再置顶了", null);
            }
            Integer invertCurrentId = invertCurrent.getId();
            Integer invertTopId = invertTop.getId();
            invertCurrent.setId(invertTopId);
            invertTop.setId(invertCurrentId);
            columnManageMapper.update(invertCurrent,new QueryWrapper<ColumnManagePo>().eq("id",invertCurrent.getId()));
            columnManageMapper.update(invertTop,new QueryWrapper<ColumnManagePo>().eq("id",invertTop.getId()));
        }


        if (columnManagePrm.getFlag() == 1){
            ColumnManagePo invertCurrent = columnManageMapper.selectOne(new QueryWrapper<ColumnManagePo>().eq("id", id));
            ColumnManagePo invertUp = columnManageMapper.findUpColumnManage(invertCurrent.getId());
            if (invertUp == null){
                return HttpResult.success(400, "已经到顶了，不能再上移了", null);
            }
            Integer invertCurrentId = invertCurrent.getId();
            Integer invertUpId = invertUp.getId();
            invertCurrent.setId(invertUpId);
            invertUp.setId(invertCurrentId);
            columnManageMapper.update(invertCurrent,new QueryWrapper<ColumnManagePo>().eq("id",invertCurrent.getId()));
            columnManageMapper.update(invertUp,new QueryWrapper<ColumnManagePo>().eq("id",invertUp.getId()));
        }

        if (columnManagePrm.getFlag() == 2){
            ColumnManagePo invertCurrent = columnManageMapper.selectOne(new QueryWrapper<ColumnManagePo>().eq("id", id));
            ColumnManagePo invertNext = columnManageMapper.findNextColumnManage(invertCurrent.getId());
            if (invertNext == null){
                return HttpResult.success(400, "已经到底了，不能再下移了", null);
            }
            Integer invertCurrentId = invertCurrent.getId();
            Integer invertNextId = invertNext.getId();
            invertCurrent.setId(invertNextId);
            invertNext.setId(invertCurrentId);
            columnManageMapper.update(invertCurrent,new QueryWrapper<ColumnManagePo>().eq("id",invertCurrent.getId()));
            columnManageMapper.update(invertNext,new QueryWrapper<ColumnManagePo>().eq("id",invertNext.getId()));
        }

        return HttpResult.success(200, "操作成功", null);
    }