SQL Server Reporting Services, RDL and Windows Environment Variable

If I define a variable in the OS like:

SET MyTest="Hello"

Is it possible and if so, how, to get that MyTest variable value into an RDL of SSRS? It's on SQL Server 2014.

It is possible to do like a variable of %MyTest% from within the RDL?

Thanks in advance for the information
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davismAsked:
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DcpKingConnect With a Mentor Commented:
I was referring to the id of the runner of the proc supplying data to the report. However, I also found the CodePlex link that shows something of running SSRS with PowerShell, which might be easier to use to get the environment value variable and produce data accordingly for the report ... I haven't had a chance to try any of this, though (sorry!).

Mike
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DcpKingCommented:
If you can grant the reporting system the permissions, the code that gathers the data before feeding it to the report (I personally prefer backing reports with stored procedures rather than embedded queries, as they're lots easier to maintain) can use xp_cmdshell to run code to obtain the information you seek. Then run some PowerShell to push it back into SQL Server.
In fact, you should be able to embed PowerShell into your report - see here for some info.

Hope this helps

Mike
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davismAuthor Commented:
I prefer NOT allowing xp_cmdshell possibilities from within SQL. SQL should not interact with the DBMS except for maybe DBA need/use.  A CLR is a better option than xp_cmdshell.

Why would the reporting system need permissions to access the environments variables? It would be read-only.
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davismAuthor Commented:
Thanks Mike! Great information.
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