Question

I am working in an application in which user selects some rows in a gridview by clicking on check boxes associated with each row and in selected rows only one value should be updated in database.
I am using following query

 update Items
 set bitIsTab = 1
 where ReqID = 3

Suppose that user selects 4 values from gridview and i have to set these 4 rows bitIsTab to 1.How to update these rows by calling query one time or i have to call the same query as many times as the number of records selected.

Answer 1

Okay the query should look like this, to update items 1,2,3,4:

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

It can however be done using 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();

Or you could use a VARCHAR in your stored procedure:

CREATE PROCEDURE sp_setTabItems
    @ids varchar(500) AS
 UPDATE Items
 SET bitIsTab = 1
 WHERE charindex(',' + ReqID + ',', ',' + @ids + ',') > 0;

And then use “1,2,3,4” as your stored procedure parameter.

To execute the stored procedure:

 EXEC sp_setTabItems '1,2,3,4'

Could also be done in a more reusable way, with the bitIsTab as a parameter:

CREATE PROCEDURE sp_setTabItems
    @isTab bit,
    @ids varchar(500) AS
 UPDATE Items
 SET bitIsTab = @isTab 
 WHERE charindex(',' + ReqID + ',', ',' + @ids + ',') > 0;

And executed this way:

EXEC sp_setTabItems '1,2,3,4',1

I updated the stored procedure solution, since comparing a INT with a VARCHAR won’t work with the EXEC.