Report Builder 3.0-如何编写读取所有parm名称和值的SQL？

Question

Example:

Parameter: parm

Label: ParmLabel

Value: value

The user is going to select the value of the parameter they want, then run the report. When the report loads, I want to display on the report a URL string containing all of the parameters & the values they selected. How can I do this?

The tricky parts:

1. There are many parameters, so manually coding for each parameter would take too long. Need a way to loop through.

2. Some parameters might be left blank and some might be NULL

3. All the parameters could have different data types, so the solution would need to be independent of data type.

What I've tried:

This worked, but it is not realistic to do this for every report and every parameter within that report. This method required me to go into the DataSet Properties and pass in the values for multi-valued parameters as a comma separated string of values, which was annoying. I'd like to avoid this as well if possible.

select

    (@URL 

        + 

            case 
                when len(@parm) <> 0 --This works. The query skips the parm if no values (or only blank values) are passed.
                then '&parm=' + replace(@parm, ',', '&parm=')
                else '' --Parm has no values
                end 

    ) as URLString

Answer 1

I can think of one hack for you here. This is untested and probably will need polish.

1) First build a dataset to return a dynamic table query and inside the dataset add a query similar to below. This should generate a table with X number of records. The idea is to set X to the number of parameters the user had made use of on your report.

DECLARE @RowCount INT=4
;WITH T AS( 
    SELECT N=1 
    UNION ALL 
    SELECT N + 1 FROM T WHERE N + 1 <= @RowCount 
) 
SELECT RowNumber=N FROM T 
OPTION (MAXRECURSION 255);

2) Add a tablix or table to your report and set the data source to the data source created above.

3) Add your labels for the parameter details inside the table created in step 2.

4) Add a custom code procedure to return details for each parameter.

Public Function GetParameter(ByVal parameters as Parameters, ByVal index as Integer) as Parameter
    Return parameters(index)
End Function

5) Add a custom code procedure to return the parameter count.

Public Function GetParameterCount(ByVal parameters as Parameters) as Integer
    Return parameters.Count()
End Function

6) Fill the row count parameter with the count above

7) Fill the labels using their expressions

=Code.GetParameter(Parameters,Fields!RowNumber).Value
=Code.GetParameter(Parameters,Fields!RowNumber).Name
=Code.GetParameter(Parameters,Fields!RowNumber).DisplayLabel
...

MSDN Documentation on accessing Report Parameters in Custom Code