SSRS add event data and manually updating SSRS Parameter - reporting-services

Question

I am not sure if this is the best way, but it work for me. THe only downside is I need to add a random seconds of delay in order to use the current parameter.
Please look at my code below.
In SQL JOB of SSRS I modify step 1 of the SQL JOB. Prior to do exec addevent I update parameter value.
declare #xml as xml
set quoted_identifier ON
DECLARE db_cursor CURSOR FOR
SELECT C.[City]
FROM #FService C
GROUP BY C.[City]
ORDER BY C.[City]
DECLARE #CityLoop VARCHAR(50);
OPEN db_cursor;
FETCH NEXT FROM db_cursor INTO #CityLoop;
WHILE ##FETCH_STATUS = 0
BEGIN
-- THIS IS TO UPDATE XML
set #xml = (select Parameters
from ReportServer.dbo.Subscriptions sb
where sb.SubscriptionID = 'GUID')
set #xml.modify(' replace value of
(/ParameterValues/ParameterValue[2]/Value/text())[1] with
sql:variable("#CityLoop") ')
-- HERE WE UPDATE PARAMETER TABLE
update ReportServer.dbo.Subscriptions
set parameters = convert(nvarchar(max), #xml)
where SubscriptionID = 'GUID'
-- HERE IS THE ORIGINAL EXEC
exec [ReportServer].dbo.AddEvent #EventType='TimedSubscription', #EventData='GUID'
WAITFOR DELAY '00:00:30';
--RAISERROR (#DealLoop, 0, 1) WITH NOWAIT
FETCH NEXT FROM db_cursor INTO #CityLoop;
END;
CLOSE db_cursor;
DEALLOCATE db_cursor;
Notice we add a 30 seconds delay for the SSRS to pickup and execute the report.
is there a way to avoid random seconds and execute the report directly? or AddEvent is the only way to do this?
if I don't have a delay, the report will only run using the last #cityLoop parameter. that is why I add the delay then the job works properly by sending email every 30 seconds for each City that is available in the parameter query
I am using SSRS and SQL Server 2012
thank you for your help

Answer 1

I adapted this in order to solve the risky random wait times.
SQL Server central article[https://www.sqlservercentral.com/articles/dynamically-name-reportfile-export-in-ssrs]
It basically uses a wait for execution
-- WAIT for EXECUTION
set #bool1 = ISNULL((select eventdata from event where eventdata = #SBidEventData), '')
while #bool1 <> ''
begin
set #bool1 = ISNULL((select eventdata from event where eventdata = #SBidEventData), '')
if #bool1 = ''
begin
-- SET PATH AND PARAMETER TO THE WAY IT WAS
WAITFOR DELAY '000:00:07'
update Catalog
set Path = '/Report/Report1'
where ItemID = #ItemID
update Subscriptions
set Parameters = '<ParameterValues><ParameterValue><Name>Year</Name><Value>2019</Value></ParameterValue><ParameterValue><Name>Category</Name><Value>HONDA</Value></ParameterValue><ParameterValue><Name>Month</Name><Value>12</Value></ParameterValue></ParameterValues>'
where SubscriptionID = #SBidEventData
end
end