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SSRS. Parametres mdx script doesn't work with multi-value


SSRS. Parametres mdx script doesn't work with multi-value

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Lidou123
Lidou123
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Hi ALL,

I need your your help!!

I want to create a report with multi-value parameters with SSRS.

So, I wrote this mdx script:

WITH
-- Geography metadata

MEMBER [Measures].[Geographie]
AS StrToValue ( @SelectionGeographie + ".Hierarchy.Currentmember.Uniquename" )
MEMBER [Measures].[Geographie_Label]
AS StrToValue( @SelectionGeographie + ".Hierarchy.CurrentMember.Member_Caption" )

-- Activity metadata

MEMBER [Measures].[Activite]
AS StrToValue( @SelectionActivite + ".Hierarchy.Currentmember.Uniquename" )
MEMBER [Measures].[Activite_Label]
AS StrToValue( @SelectionActivite + ".Hierarchy.CurrentMember.Member_Caption" )

-- Date metadata

MEMBER [Measures].[Temps]
AS StrToValue( @Annee + ".Hierarchy.Currentmember.Uniquename" )
MEMBER [Measures].[Temps_Label]
AS StrToValue( @Annee + ".Hierarchy.CurrentMember.Member_Caption" )

-- Perimetre metadata
MEMBER [Measures].[Perimetre]
AS StrToValue( @Perimetre + ".Hierarchy.Currentmember.Uniquename" )
MEMBER [Measures].[Perimetre_Label]
AS StrToValue( @Perimetre + ".Hierarchy.CurrentMember.Member_Caption" )


SELECT NON EMPTY {
-- display the parameters attributes on columns

[Measures].[Geographie],
[Measures].[Geographie_Label],


[Measures].[Activite],
[Measures].[Activite_Label],

[Measures].[Temps],
[Measures].[Temps_Label],

[Measures].[Perimetre],
[Measures].[Perimetre_Label],


[Measures].[11 VA]


} ON COLUMNS,

( STRTOSET ( "{" + @SelectionGeographie + "}") ,


STRTOSET ("{" + @SelectionActivite + "}" ))


ON ROWS

FROM [MyCube]

WHERE STRTOTUPLE ( "(" +@Annee + "," + @Perimetre + ")" )

But It works with one value in parameter and not with muti-value parameters.
I have null result in my metadata members when I have multi value.

Any idea ?

Thank U
Lidou123
Lidou123
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Noone ? I don't know why That works when I have only one parameter and not with many parameters ? is it possible to use the uniquename functions with muti-value ?
davoscollective
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StrToValue ( @SelectionGeographie + ".Hierarchy.Currentmember.Uniquename" )

StrToValue( @SelectionActivite + ".Hierarchy.Currentmember.Uniquename" )

StrToValue( @Annee + ".Hierarchy.Currentmember.Uniquename" )

StrToValue( @Perimetre + ".Hierarchy.Currentmember.Uniquename" )

STRTOSET ( "{" + @SelectionGeographie + "}")

STRTOSET ("{" + @SelectionActivite + "}" )

STRTOTUPLE ( "(" +@Annee + "," + @Perimetre + ")" )



Parameters in reporting services cannot be arrays, although you can get away with SQL parameters like this "where field in (@parameter)", check the query actually being passed in profiler and you'll see it's SSRS intervening though, it's not passing an array. SQL and MDX can't do arrays either so you need to work around that by providing a long string.

With these MDX functions, they are all expecting string input in order to produce a value / set / tuple. If you wanted to do multi value you would need to use a different one for each value of the parameter, or alternatively create them dynamically.

One option is to use the Expression builder for the query. I.e. right click on your dataset, choose properties, click the Fx button to edit the query as an expression.
Make the entire query a string that evaluates to an MDX query.

e.g.
="With member...
select on 0
, on 1
from cube"

You can use the SSRS JOIN() function to link all your parameters into one long comma delimited string and then intersperse those into the MDX string. You will end up with a lot of nested quotes though so it will get really tricky to read and debug.

You would want something like this (you can't refer to @Parameter in an SSRS expression, you need to use Parameters!Parameter.value)

STRTOSET ( "{" + JOIN(Parameters!SelectionGeographie.value,",") + "}") 



For the other example, you will want to include the hierarchy in each instance of the parameter value

e.g. this won't work because you need the hierarchy in every instance and the formula will exlude it from the final one:

StrToValue ( Join(Parameters!SelectionGeographievalue + ".Hierarchy.Currentmember.Uniquename,") )




Stacia Misner also has a good write up on a similar technique here

Another option is to move your MDX query into a stored procedure, and pass in the multi-value parameter into it.
Lidou123
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Hi davoscollective,

Thank you for your answer. Very helpful.

But my chief doesn't want to work with dataset expression.

So, I think that the problem is not the multi-value parameters. I solved the multi-value problem with this method: http://saldeloera.wordpress.com/2013/02/07/ssrs-how-to-straightforward-method-to-pass-mdx-multi-select-parameters-to-mdx-datasets/


Because with my mdx dataset test:

WITH 
-- Geography metadata
MEMBER [Measures].[Geographie]
AS StrToValue ( @SelectionGeographie + ".Hierarchy.Currentmember.Uniquename" )
MEMBER [Measures].[Geographie_Label]
AS StrToValue( @SelectionGeographie + ".Hierarchy.CurrentMember.Member_Caption" )

SELECT NON EMPTY {
[Measures].[Geographie],
[Measures].[Geographie_Label],
[Measures].[11 VA]


} ON COLUMNS,

( STRTOSET ( "{" + @SelectionGeographie + "}") ,


STRTOSET ("{" + @SelectionActivite + "}" ))


ON ROWS

FROM [MyCube]

WHERE STRTOTUPLE ( "(" +@Annee + "," + @Perimetre + ")" )




1- When I put one value parameter, I have the result on both columns and rows. That works perfectly.
No errors, no "null" result .

2- but when I put multi-value parameters , I have result only on rows.
I have no errors but I have a "null" result on columns.
I think that the problems are from the .currentmember.uniquename functions. Any idea ?

Thank U
davoscollective
davoscollective
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If you have rows but null columns then it's because the calculated member is silently erroring, and that will be indirectly related to the multiple parameter values.

If this is working:

STRTOSET   ("{" + @SelectionActivite + "}" ))



and this is not working:
StrToValue ( @SelectionGeographie + ".Hierarchy.Currentmember.Uniquename" )



It's because it is not appending the ".Hierarchy.Currentmember.Uniquename" to each of the multiple values in the parameter. That code is attempting to apply that suffix to a whole "array", rather than to each member of the array which is what you want.


I've solved this similar issue by making the value of each parameter have that as a stiring value.

For example, if you are using a dataset to populate the available values of @SelectionGeographie, and the dataset is coming from a SQL query then it's trivial to append the string ".Hierarchy.Currentmember.Uniquename" to the column results in the returned dataset directly in SQL.
select Cast(column as varchar(100)) + ".Hierarchy.Currentmember.Uniquename"  



If you are returning a dataset with MDX or DAX, you might need to get creative. You could use a calculated column in the SSRS properties of the dataset and just append the string ".Hierarchy.Currentmember.Uniquename" in there. That might be the simplest way to do it.


You could also query the cube via a linkedserver OpenQuery() call (within a stored proc) which would pull cube results back to SQL where you could then trivially append the ".Hierarchy.Currentmember.Uniquename". I've gone with the second option for example to return a list of fiscal periods in order to populate available values of a parameter with a useful reverse-chronological order. Extracting the members in the cube dimension gives me something like "2012-P01" but from there I need to get a member reference that looks more like "[Fiscal Calendar]."[Fiscal Calendar].[2012].[Period 1]" so there's a little string manipulation in the SQL to do that.

It's also a useful way to populate the default value of that parameter because the current fiscal period is the first entry in the dataset (it's in reverse chronological order so newest is first) and helps the user run the report without first having to select a period, but using the same dataset for the "available values" also provides them with an opportunity to change the drop-down selection to view historical periods.
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