How to retrieve the input parameter values of a stored procedure - tsql

Question

I want to create a auditing procedure which will be called in the catch block of all the procedure in my Database.
I wanted to store the list of all the input parameters and its values in this auditing DB.
Please suggest me, how to achieve this in SQL Server

Answer 1

I am not aware of programatically retrieving the list of parameters and their values for a stored proc(Possibly would involve n number of system tables and things like that). Without going into that level of complexity AND if altering the current procedures is a possibility, you could do something on the lines of below.
ALTER the existing stored procs to add a small functionality wherein you populate a table variable with
the parameters in a set string format('#paramname = paramvalue') and their values in the current proc
and then fire the Auditing proc if the control reaches the CATCH block.
--Add this code bit on top of the proc from where you want the Audit Proc to be fired
--Declare and insert into a table variable
Declare #ParamValues TABLE (params varchar(400))
insert into #ParamValues
select '#id = '+ #id UNION
select '#name = '+ #name UNION
select '#date = '+ #date
GO
...
....
END TRY
begin catch --Auditing proc code below
exec AuditDB.dbo.AuditProc #ParamValues,
OBJECT_NAME(##PROCID) --this returns the name of current proc
end catch
-------
-------Create the requisite SQL objects
-------
CREATE TABLE AuditDB.dbo.AuditTable
(
AuditMessage varchar(400),
ProcName varchar(200),
DateTimeStamp DateTime
);
GO
CREATE TYPE AuditDB.dbo.ParamValuesType AS TABLE
(
params varchar(400)
);
GO
CREATE PROCEDURE AuditDB.dbo.AuditProc
#ParamValues dbo.ParamValuesType READONLY
,#ProcName varchar(200)
AS
BEGIN --Add whaterver lines of code required, this is just a basic version.
INSERT INTO AuditDB.dbo.AuditTable
SELECT params, #ProcName, cast(getdate() as datetime) FROM #ParamValues
END;