We could query BISM Tabular model using either MDX or DAX. People are very familiar with how to use MDX in SSRS. Using DAX in SSRS is totally different from using MDX. Here is an example to create SSRS report using DAX language:
List of Steps:
1. Open SQL Server Data Tools to create a SSRS report.
2. Add an existed BISM Tabular Model as the Shared data source.
3. Write the DAX in the SSMS or DAX Studio first. The DAX Studio is an Excel Add-Ins that you could download from the CodePlex.
4. Create SSRS dataset
- Add a new dataset and connect to the BISM Tabular Model
- Open Query Designer
- Click on the Command Type DMX button on the toolbar to switch to the DMX query designer.
- Click on the Query/Design Mode button to switch to the Query mode.
- Paste or type your DAX query into the Query window and then click on OK button.
- Click on the Fields tab to fix/rename the field name to make it more readable. The field name generated by the query designer will not lineup with the column name you have in the DAX query.
- Now, you could add those fields to the report.
5. Add parameter
- Go to dataset query, open the query designer.
- Change the DAX query by replacing the filer part of Query with parameter name and click on the Parameter Button to open the Query Parameters window
- Add Parameter and set the default value, then click OK to exit out the designer
- On the report data window, you will find a parameter been created with default value that you typed in.
6. Create parameter dataset
- There is no parameter query generated by the tool. You need to create it if you allow user to pick from the drop down list.
- Write a DAX query with VALUES() function using the same steps before to create a dataset that will contain the list of parameter values.EVALUATE
values('Product Category'[Product Category Name])
ORDER By 'Product Category'[Product Category Name]
- Associate this dataset to the report parameter
- Now your SSRS report should work with single value selection.
Report Parameter Allows Multiple Values
If you allow multiple values for the report parameter, you could not use filter with equal sign (“ = ”) in the DAX query. You could use PATHCONTAINS() function in the filter part of query to filter the result set.PATHCONTAINS(<path>, <item>)Since the multi select parameter string pass in will contain extra special characters that could not be used for the Path() function, you need to use Substitute() function to replace them.
Here is the complete DAX query for the report.