如何在sql server中更新表中的选择行？

Question

我正在一个应用程序中，用户通过单击与每行关联的复选框选择gridview中的某些行，并且在选定的行中，只应在数据库中更新一个值。 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4个值，并且我必须将这4行bitIsTab设置为1.如何通过调用查询一次来更新这些行，或者我必须调用与所选记录数一样多次的相同查询。

Answer 1

如果你知道你可以做的ReqID

update Items
set bitIsTab = 1
where ReqID in (1,2,3,4)

Answer 2

好的，查询应如下所示，更新项目1,2,3,4：

 UPDATE Items
 SET bitIsTab = 1
 WHERE ReqID IN (1,2,3,4);

但是可以使用Linq完成：

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();

或者您可以在存储过程中使用VARCHAR ：

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”作为存储过程参数。

要执行存储过程：

 EXEC sp_setTabItems '1,2,3,4'

也可以使用bitIsTab作为参数以更可重用的方式完成：

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INT与VARCHAR进行比较将无法与EXEC 。

Answer 3

一个简单的解决方案

 DECLARE @id varchar(30)
 SET @id = '1,3,2'

 UPDATE [Items]
 SET bitIsTab = 0
 WHERE ReqID IN (
                    SELECT s
                    FROM dbo.Split(',', @id)
                )

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
 )

Answer 4

如果你必须将数据作为分离的ID列表传递，那么你需要编写一个函数来解释如何在单个语句中将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
   )