how to create parentchild hierachery in ssrs single parameter - ssrs-2008

Question

I have one doubt in ssrs .
how to create parent hierachery in single parameter in ssrs with table report using sql server database table.
table: empdetails:
CREATE TABLE [dbo].[empdetails](
[empid] [int] NULL,
[country] [varchar](50) NULL,
[state] [varchar](50) NULL,
[empname] [varchar](50) NULL,
[deptno] [int] NULL
) ON [PRIMARY]
GO
INSERT [dbo].[empdetails] ([empid], [country], [state], [empname], [deptno]) VALUES (1, N'india', N'ap', N'abc', 10)
GO
INSERT [dbo].[empdetails] ([empid], [country], [state], [empname], [deptno]) VALUES (2, N'india', N'ka', N'def', 20)
GO
INSERT [dbo].[empdetails] ([empid], [country], [state], [empname], [deptno]) VALUES (3, N'india', N'tn', N'de', 30)
GO
INSERT [dbo].[empdetails] ([empid], [country], [state], [empname], [deptno]) VALUES (4, N'usa', N'TX', N'deet', 50)
GO
INSERT [dbo].[empdetails] ([empid], [country], [state], [empname], [deptno]) VALUES (5, N'usa', N'NJ', N'ion', 60)
GO
INSERT [dbo].[empdetails] ([empid], [country], [state], [empname], [deptno]) VALUES (6, N'usa', N'WV', N'xy', 70)
GO
INSERT [dbo].[empdetails] ([empid], [country], [state], [empname], [deptno]) VALUES (7, N'uk', N'Belfast', N'io', 40)
GO
INSERT [dbo].[empdetails] ([empid], [country], [state], [empname], [deptno]) VALUES (8, N'uk', N'Wycombe', N'un', 50)
GO
based on above table : I want create parent hierrachery in singe paramerte like below in ssrs table report :
country....>State: drop down look like below:
paramername:countryandstateparamer:
india
ap
ka
tn
usa
nj
wv
tx
uk
Belfast
Wycombe
here If I select india then dispaly corresponding states data (ap,ka,tn).
if I select ap state then display only ap related data(ap)
if I select ap and ka state then display only ap and ka data( ap and ka)
similay to other counry and states.
I tried like below :
dataset : select * from empdetails where country in #country and state in ( #state)
dataset 1: select distinct country from empdetails
dataset2 : select distinct state from empdetails where county=#country
after that I go throught two paramerts mapping
here preview time I got two paramater one is country paramaterand 2nd is state paramater.But I want only creat only one paramater that parater show like counryandstate hierchar using sql server table data.
please tell me how to solve this issue in ssrs report multiple hieracher in single paramater .

Answer 1

There is no built-in way to build a hierarchy with SQL Server as the source (SSAS supports this though).
We can do with with a bit of code, the first part could be done using a view but this should work even though it seems like a lot of code, most of it is repeated (hence why a view would be better)
Anyway,
First we need a dataset to supply data to the parameter list.
First dataset
Create a dataset called dsRegions
Set the dataset query to be
/* This could be built as a view to simplfy things */
-- create a table for the results
DECLARE #regions TABLE(RegionDisplayName varchar(50), RegionType varchar(1), RegionOrder decimal (10,3), RegionName varchar(50))
-- first get the countries in order and assign a sort order
INSERT INTO #regions
SELECT *
, ROW_NUMBER() OVER(ORDER BY country) AS CountryOrder
, country
FROM
(SELECT DISTINCT Country, 'C' AS RegionType FROM empdetails) e
-- now get the states and assign the sort order from the country plus a sort oder for the state (supports 999 states/country)
INSERT INTO #regions
SELECT
' ' + state, 'S' -- indent the states so they look better in the parameter list
, RegionOrder + CAST(ROW_NUMBER() OVER(PARTITION BY c.RegionName ORDER BY state) as decimal(10,3)) / 1000 AS StateOrder
, state
FROM #regions c
JOIN empdetails e on c.RegionName = e.country
-- finally output the results
SELECT * FROM #regions order by regionorder
Parameter : let's call this #pRegion
So create a parameter called pRegion and set its available values dataset to dsRegions.
important Set the Value to RegionName and the label to RegionDisplayName
This will give us a nice ordered indented list for the user to see.
Main dataset query
The main dataset query repeats most of the parameter dataset query
The only difference is the final output which filters both country and state and if either match it will return the records. The query is as follows
-- create a table for the results
DECLARE #regions TABLE(RegionDisplayName varchar(50), RegionType varchar(1), RegionOrder decimal (10,3), RegionName varchar(50))
-- first get the countries in order and assign a sort order
INSERT INTO #regions
SELECT *
, ROW_NUMBER() OVER(ORDER BY country) AS CountryOrder
, country
FROM
(SELECT DISTINCT Country, 'C' AS RegionType FROM empdetails) e
-- now get the states and assign the sort order from the country plus a sort oder for the state (supports 999 states/country)
INSERT INTO #regions
SELECT
' ' + state, 'S' -- indent the states so they look better in the parameter list
, RegionOrder + CAST(ROW_NUMBER() OVER(PARTITION BY c.RegionName ORDER BY state) as decimal(10,3)) / 1000 AS StateOrder
, state
FROM #regions c
JOIN empdetails e on c.RegionName = e.country
-- output
SELECT
e.*
FROM empdetails e
WHERE country in (#pRegion)
or state in (#pRegion)
I've done a simple test and this works as expected, so if you select UK and TX you will get records for Belfast, Wycombe and TX
Hope this helps.