How to get data from subsites list of SharePoint 2010 in ssrs

Question

Hi,
Can someone help me on this issue.
I want to create a report using ssrs, I have some of the data in SQL and some of the data in sharepoint list.
First I need to go to SQL and get the data from the table which contains URL for the subsite in sharepoint.
after that I need to go to all the subsites and go to perticulat list in the subsites and get data from that list.
for example, their is a top level site "abc"
it contains sub site "123", "456","567", etc.. All this sub sites contain a list by name "Sample List", Now I need to go to that sub site list(Sample List) and get list-item column say "created By" which
is created on particular date. 
in my report, I need to print the sub site "url/Title" which comes from SQL database and list-item column  "Created By" of that sub site list "Sample List".
I tried using subreport inside a report by using "Microsoft SharePoint List" as a datasource, but when it comes to real time we don't know how many subsites will be created, so we can't create a datasource for each subsite site.
I guess we need to be using XML as a datasource, but how can we go to particular subsite in query while using XML, since all subsites have list with the same name ?
I appreciate your help.
Thank you,
Kishore 

Answer 1

Hi Kishore,
SQL Server Reporting Services(SSRS) supports expression-based connection strings. This will help us to achieve the goal you mentioned in this case:
Create a new report
Create a Data Source in the report with the connection string like this:
http://server/_vti_bin/lists.asmx (We use static connection string instead of expression-based connection string now, as it is not supported to get fields based on expression-based connection string in design time. We will change it to be expression-based
connection string later)
Create the data set(as you have done using XML query language). Please use list name instead of GUID in the listName parameter.
Design the report(e.g. Add controls to the report)
Now, let's change the connection string to be expression-based. First, please add a parameter to the report, move this parameter to top. This parameter is used to store the sub site name.
Open the Data Source editor, set the connection string to be: ="http://server/" & Parameters!parameterCreatedInStep5.value & "_vti_bin/lists.asmx"
In the main report, pass the sub site name to the report we created above via the parameter created in step5
That is all.
Anyway, this is actually a SQL Server Reporting Service(SSRS) question. You can get better support on this question from:
http://social.technet.microsoft.com/Forums/en/sqlreportingservices/threads
For more information about Expression-Based connection string, please see:
http://msdn.microsoft.com/en-us/library/ms156450.aspx#Expressions
If there is anything unclear, please feel free to ask.
Thanks,
Jinchun Chen
Jin Chen - MSFT