我正在一个应用程序中工作,在该应用程序中,用户通过单击与每一行关联的复选框来选择网格视图中的一些行,并且在选定的行中,只有一个值应该在数据库中更新。我正在使用以下查询
update Items
set bitIsTab = 1
where ReqID = 3
假设用户从 gridview 中选择了 4 个值,并且我必须将这 4 行 bitIsTab 设置为 1。如何通过调用一次查询来更新这些行,或者我必须调用与所选记录数一样多的相同查询。
如果你知道ReqID
s 你可以做
update Items
set bitIsTab = 1
where ReqID in (1,2,3,4)
好的,查询应该如下所示,以更新项目 1、2、3、4:
UPDATE Items
SET bitIsTab = 1
WHERE ReqID IN (1,2,3,4);
然而,它可以使用Linq
:
List<int> selectedIds = { 1, 2, 3, 4 };
var itemsToBeUpdated = (from i in yourContext.Items
where selectedIds.Contains(i.ReqID)
select i);
itemsToBeUpdated.ForEach(i=>i.bitIsTab = 1);
yourContext.SubmitChanges();
或者您可以VARCHAR
在存储过程中使用 a:
CREATE PROCEDURE sp_setTabItems
@ids varchar(500) AS
UPDATE Items
SET bitIsTab = 1
WHERE charindex(',' + ReqID + ',', ',' + @ids + ',') > 0;
然后使用“1,2,3,4”作为您的存储过程参数。
要执行存储过程:
EXEC sp_setTabItems '1,2,3,4'
也可以以更可重用的方式完成,使用bitIsTab
作为参数:
CREATE PROCEDURE sp_setTabItems
@isTab bit,
@ids varchar(500) AS
UPDATE Items
SET bitIsTab = @isTab
WHERE charindex(',' + ReqID + ',', ',' + @ids + ',') > 0;
并以这种方式执行:
EXEC sp_setTabItems '1,2,3,4',1
我更新了存储过程解决方案,因为将 aINT
与 a进行比较VARCHAR
不适用于EXEC
.
一个简单的解决方案是
DECLARE @id varchar(30)
SET @id = '1,3,2'
UPDATE [Items]
SET bitIsTab = 0
WHERE ReqID IN (
SELECT s
FROM dbo.Split(',', @id)
)
在哪里
CREATE FUNCTION dbo.Split (@sep char(1), @s varchar(512))
RETURNS table
AS
RETURN (
WITH Pieces(pn, start, stop) AS (
SELECT 1, 1, CHARINDEX(@sep, @s)
UNION ALL
SELECT pn + 1, stop + 1, CHARINDEX(@sep, @s, stop + 1)
FROM Pieces
WHERE stop > 0
)
SELECT pn,
SUBSTRING(@s, start, CASE WHEN stop > 0 THEN stop-start ELSE 512 END) AS s
FROM Pieces
)
如果您必须将数据作为分隔 ID 的列表传递,那么您需要编写一个函数,用于在单个语句中将 CSV 数据拆分并插入到新表中?
CREATE PROCEDURE sp_setTabItems
@ids varchar(500) -- 1,2,4,6
AS
UPDATE Items
SET bitIsTab = 1
WHERE ReqID IN (Select Part From dbo.inline_split_me(@ids)
这是功能
CREATE FUNCTION inline_split_me (@SplitOn char(1),@String varchar(7998))
RETURNS TABLE AS
RETURN (WITH SplitSting AS
(SELECT
LEFT(@String,CHARINDEX(@SplitOn,@String)-1) AS Part
,RIGHT(@String,LEN(@String)-CHARINDEX(@SplitOn,@String)) AS Remainder
WHERE @String IS NOT NULL AND CHARINDEX(@SplitOn,@String)>0
UNION ALL
SELECT
LEFT(Remainder,CHARINDEX(@SplitOn,Remainder)-1)
,RIGHT(Remainder,LEN(Remainder)-CHARINDEX(@SplitOn,Remainder))
FROM SplitSting
WHERE Remainder IS NOT NULL AND CHARINDEX(@SplitOn,Remainder)>0
UNION ALL
SELECT
Remainder,null
FROM SplitSting
WHERE Remainder IS NOT NULL AND CHARINDEX(@SplitOn,Remainder)=0
)
SELECT Part FROM SplitSting
)