View or Query

Question

I am very inexperienced with LS (second attempt after looking a few years ago).
I have watched many video tutorials which has got me very motivated to give it a nother go but I am failing at the first hurdle.
I have an existing DB in SQl2008 for CLIENTS and an SQL View which is filtered to only show records based on a users list of area's they can access).
CREATE VIEW [dbo].[vCLIENT] AS
SELECT dbo.CLIENT.Client_Name
, dbo.CLIENT.Client_Address
FROM dbo.CLIENT
INNER JOIN dbo.USER_AREA
ON dbo.USER_AREA.Centre_Code = dbo.CLIENT.Centre_Code
I started my new app by using this view but the primary key is being infered so I am now thinking what I would be better doing is creating a "Query", could someone confirm this is the correct path to take and possibly provide a syntax example I would
add in to the code ?
Thanks in advance
Dave

Answer 1

Efficient:
Whenever possible i try to use views on the SQL Server. This reduce the amount of data fly to the Client. Second I'm easy able to create Indexes and so on to Speed up collecting the data.
A Version which working on the Middle Tier:
You can use the preprocessquery Option.
In LS (HTML) create a query based on your table. In the query designer you can choose write code and the preprocessQuery.
In the Query you can add code like this (VB but C# is working in the same way)
Private Sub qrySelectTableforUser_PreprocessQuery(ByRef query As System.Linq.IQueryable(Of LightSwitchApplication.yourtable))
query = query.Where(Function(fx) fx.user Is Me.Application.User.Name)
End Sub
Hope this helps.
Kind Regards
Thomas