将SSRS参数传递给SQL查询

Question

I've built an SSRS report that is supposed to look at data from one of several tables with similar names - ie, table001, table010, table011, etc. When I was building the report, I was only including three of the tables, out of more than a dozen. Everything worked fine until I added all the rest of the tables to the query, using multiple SELECT statements UNIONed together; it was trying to sort through so much data that it was taking almost half an hour to render the report. That's not going to work.

Is there a way to pass an SSRS parameter to the SQL query, specifying which table to access?

Answer 1

Based on your comments, you could do the following

DECLARE @Parameter NVARCHAR(15) = 'Foo'

SELECT CASE 
WHEN @Parameter IN ('Foo', 'Bar')
    THEN (
            SELECT *
            FROM table001
         ) 
WHEN @Parameter IN ('Foobar')
    THEN (
            SELECT *
            FROM table002
         ) 
ELSE
         (
            SELECT *
            FROM table003
         )
END

Alternately

SELECT CASE @Parameter 
WHEN 'Foo'
    THEN (
            SELECT *
            FROM table001
         ) 
WHEN 'Bar'
    THEN (
            SELECT *
            FROM table002
         ) 
WHEN 'Foobar'
    THEN (
            SELECT *
            FROM table003
         ) 
ELSE
    (
        SELECT *
        FROM @table004
    )
END

Answer 2

Have you followed the MSDN tutorial? This is good too: http://sql-bi-dev.blogspot.com/2010/07/report-parameters-in-ssrs-2008.html

Please share what you have tried and where you are having trouble. Essentially, you define a parameter in the report and include it in your query. SSRS provides the parameter value (or it is received through user input), and then the final query is passed off to the database.