2

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。

4

4 回答 4

7

如果你知道ReqIDs 你可以做

update Items
set bitIsTab = 1
where ReqID in (1,2,3,4)
于 2012-10-24T17:46:52.097 回答
5

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.

于 2012-10-24T17:51:46.780 回答
1

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
 )
于 2012-10-24T18:45:31.143 回答
0

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
   )
于 2012-10-24T18:01:45.437 回答