Help Designing Query For Any Number Of 5 Parameters

Hello everyone,

I'm having trouble designing a query for an ASP.NET project I'm working on. The main portion of the query is done and works, but I need to modify it to accept 5 parameters. Below is the main query:





Code Block

@LocID as nvarchar(10)

SELECT dbo.ProfileNames.Name, dbo.AircraftGateInput.*
FROM dbo.ProfileNames
LEFT JOIN dbo.AircraftGateInput
ON dbo.ProfileNames.Name = dbo.AircraftGateInput.Gate
WHERE dbo.ProfileNames.Type = 'Gate' AND dbo.ProfileNames.Location = @LocID
The changes I need to make to this are confusing me because I've had to do something like this before. There are 5 DropDownLists on the page the user can select as parameters for searching/filtering the information. The query above is what's being used now, and causes the page to dynamically generate a certain number of colums based on the number of returned columns.

The parameters that are available are: Gate, Location, Offload Zone, Onload Zone and Equipment. I wwant the user to be able to select all or any number of these as search options but I'm not really sure how to design the query to do this. A co-worker suggested doing something like this:





Code Block

@LocID as nvarchar(10),
@Gate as nvarchar(50),
@Location as nvarchar(50),
@OffLZ as nvarchar(50),
@OnLZ as nvarchar(50)

SELECT dbo.ProfileNames.Name, dbo.AircraftGateInput.*
FROM dbo.ProfileNames
LEFT JOIN dbo.AircraftGateInput
ON dbo.ProfileNames.Name = dbo.AircraftGateInput.Gate
WHERE (dbo.ProfileNames.Type = 'Gate') AND (@Gate IS NULL OR dbo.ProfileNames.Name = @Gate)

AND (dbo.ProfileNames.Location = @LocID)


AND (@Location IS NULL OR dbo.AircraftGateInput.Location = @Location)
AND (@OffLZ IS NULL OR dbo.AircraftGateInput.OffLZ = @OffLZ)
AND (@OnLZ IS NULL OR dbo.AircraftGateInput.OnLZ = @OnLZ)
At this point I'm not a 100% sure on how to test this query in the query designer in Management Studio 2005 (this is also a .NET 2.0 project). If anyone can help, I'd really appreciate it, thanks.