如何在Sql中的表行中的两个值之间切换

我有一个带有以下列的表名[NavBar]：

Id [int]
Name [nvarchar]
DisplayOrder [int]

样本数据：

Id   Name   DisplayOrder
---------------------------
 1   Home        1
 2   Products    2
 3   Contact     3
 4   Career      4

我想写一个查询来更新两行之间的显示顺序，这两行的显示顺序是给定行的下一个更高的显示顺序值

例如，联系人=4，职业=3

预期产出：

1  Home      1
2  Products  2
3  Contact   4
4  Career    3

如何执行更新操作以在两行之间切换两个并发行的显示顺序

---

输入参数：仅一行的Id

尝试以下操作：

UPDATE NavBar  
SET     DisplayOrder =  CASE  
                        WHEN DisplayName  = @row1 THEN (select DipslayOrder from NavBar where DisplayName = @row2)  
                        WHEN DisplayName  = @row2 THEN (select DipslayOrder from NavBar where DisplayName = @row1) 
                        END 
WHERE   DisplayName IN (@row1, @row2);

---

希望这对你有用。

试试这样的方法：

UPDATE NavBar  
SET     DisplayOrder =  CASE  
                        WHEN DisplayName  = @row1 THEN (select DipslayOrder from NavBar where DisplayName = @row2)  
                        WHEN DisplayName  = @row2 THEN (select DipslayOrder from NavBar where DisplayName = @row1) 
                        END 
WHERE   DisplayName IN (@row1, @row2);

---

希望这对您有用。

您需要从输入和下一条记录中获取显示顺序 然后你就可以全部更新了。 这有点复杂，但我测试了它，它可以工作。 同样，这样可以避免DisplayOrder中有间隙时出现问题

declare @InputID int = 3
declare @DisplayOrderInput int
declare @ID int
declare @DisplayOrder int

select @DisplayOrderInput = DisplayOrder from NavBar where ID = @InputID

select top 1
       @ID = ID,
       @DisplayOrder = DisplayOrder
from   NavBar
where  DisplayOrder > (select DisplayOrder from NavBar where ID = @InputID)
order by DisplayOrder

update NavBar set DisplayOrder = @DisplayOrder where ID = @InputID
update NavBar set DisplayOrder = @DisplayOrderInput where ID = @ID

select * from NavBar

---

您需要从输入和下一条记录中获取Displayorder 然后你就可以全部更新了。 这有点复杂，但我测试了它，它可以工作。 同样，这样可以避免DisplayOrder中有间隙时出现问题

declare @InputID int = 3
declare @DisplayOrderInput int
declare @ID int
declare @DisplayOrder int

select @DisplayOrderInput = DisplayOrder from NavBar where ID = @InputID

select top 1
       @ID = ID,
       @DisplayOrder = DisplayOrder
from   NavBar
where  DisplayOrder > (select DisplayOrder from NavBar where ID = @InputID)
order by DisplayOrder

update NavBar set DisplayOrder = @DisplayOrder where ID = @InputID
update NavBar set DisplayOrder = @DisplayOrderInput where ID = @ID

select * from NavBar

试试这个-

-- 1) Get Current row's displayorder and Next Row's id in Temp table
SELECT nb1.DisplayOrder, nb2.id 
into #TempNavBar
FROM [NavBar] nb1
INNER JOIN [NavBar] nb2 ON nb1.id = nb2.id - 1
WHERE nb1.Id = 3

-- 2) Update Actual table by using Self join on Next row
UPDATE nb1
    SET nb1.DisplayOrder = nb2.DisplayOrder
FROM [NavBar] AS nb1
INNER JOIN [NavBar] AS nb2 ON nb1.id = nb2.id - 1
WHERE nb1.Id = 3

-- 3). Update Actual table by joining it with temp table
UPDATE nb1
    SET nb1.DisplayOrder = tmp2.DisplayOrder
FROM [NavBar] AS nb1
INNER JOIN #TempNavBar AS tmp2 ON nb1.id = tmp2.id

-- Cleanup operation
DROP TABLE #TempNavBar

我在这里所做的是将NavBar表本身连接到下一行id上，获取当前行的DisplayOrder列和下一行的id列值，并将其插入临时表中

在第二个查询中，我用下一行的值更新了当前行的displayOrder值

在第三个查询中，我通过将[NavBar]表与临时表连接起来，用临时表displayOrder值更新了displayOrder值

结果

试试这个-

-- 1) Get Current row's displayorder and Next Row's id in Temp table
SELECT nb1.DisplayOrder, nb2.id 
into #TempNavBar
FROM [NavBar] nb1
INNER JOIN [NavBar] nb2 ON nb1.id = nb2.id - 1
WHERE nb1.Id = 3

-- 2) Update Actual table by using Self join on Next row
UPDATE nb1
    SET nb1.DisplayOrder = nb2.DisplayOrder
FROM [NavBar] AS nb1
INNER JOIN [NavBar] AS nb2 ON nb1.id = nb2.id - 1
WHERE nb1.Id = 3

-- 3). Update Actual table by joining it with temp table
UPDATE nb1
    SET nb1.DisplayOrder = tmp2.DisplayOrder
FROM [NavBar] AS nb1
INNER JOIN #TempNavBar AS tmp2 ON nb1.id = tmp2.id

-- Cleanup operation
DROP TABLE #TempNavBar

我在这里所做的是将NavBar表本身连接到下一行id上，获取当前行的DisplayOrder列和下一行的id列值，并将其插入临时表中

在第二个查询中，我用下一行的值更新了当前行的displayOrder值

在第三个查询中，我通过将[NavBar]表与临时表连接起来，用临时表displayOrder值更新了displayOrder值

结果

---

输入参数应该是行的ID和您希望显示它的位置，对吗？我的意思是如果输入参数ID=3，即联系，那么我想切换到下一个显示顺序rowi.e职业，即4您所说的输入参数是什么意思：仅一行的ID？？我指的是仅指定用于选择和更新的ID@KrishnrajInput参数应该是行的ID以及您希望显示它的位置，对吗？我的意思是如果输入参数ID=3，即联系，那么我想切换到下一个displayorder rowi.e职业，即4您所说的输入参数是什么意思：仅一行的ID？？我是指仅指定用于选择和更新的ID@Krishnaja我如何执行这个查询？@row1、@row2或DidplayName的值是什么？如何执行此查询？@row1、@row2或DidplayName的值是什么？