exit stored procedure based on condition

Question

I have a stored procedure which is working fine and a simplified version is provided below. The result of this procedure is a json string containing data. It is then send to Azure Function for further processing.

There are cases when I do not want this stored procedure to be executed. I mean when there is no data for either @json1 or @json2.
In that cases, I need to add such a condition which will check:

if @json1 or @json2 <> null

if yes - > exec the procedure
if no - > do not exec the procedure

I tried with "if else" or "return" but with no luck. I do not want to do a mess by providing the wrong code here, basically because I do not know how to approch it.

CREATE procedure [schema].[myProcedure]  
@category nvarchar (255),  
@brand nvarchar(255),  
@geo nvarchar (255),  
@emailrecipient nvarchar (100)  
  
as begin  
  
DECLARE @json_construct varchar(MAX) = '{"req1": {X}, "req2": {Y}}';  
DECLARE @json1 VARCHAR(MAX); DECLARE @json2 VARCHAR(MAX)  
  
SET @json1 =  
(  
			select distinct  
			   [Category]  
			  ,[Brand]  
			  ,[Geo]  
			  ,[Owner] as [EmailRecipent]  
			from   
			   [schema].[table1]  
			where  
			   [Owner] = @emailrecipient  
			   and isnull([Category], '') = @category  
			   and isnull([Brand], '') = @brand  
			   and isnull([Geo], '') = @geo  
			for json path, INCLUDE_NULL_VALUES   
)  
SET @json2 =  
(  
			select  
			   [URL]  
			  ,[Start - End Date]  
			  ,[Media Channels]  
			from [schema].[table2]  
			where  
				isnull([CatDescription], '') like @category  
			    and isnull([BrandDescription], '') like @brand  
			    and isnull([Restriction Markets], '') like @geo  
			for json path, INCLUDE_NULL_VALUES   
)  
SELECT   
		REPLACE(  
			REPLACE(@json_construct,'{X}', isnull(@json1, '[]')),  
		'{Y}', isnull(@json2,'[]'))  
	AS json_output;  
end  


  
  
  
  
  

Answer 1

CREATE procedure [schema].[myProcedure]
 @category nvarchar (255),
 @brand nvarchar(255),
 @geo nvarchar (255),
 @emailrecipient nvarchar (100)

 as begin

 DECLARE @json_construct varchar(MAX) = '{"req1": {X}, "req2": {Y}}';
 DECLARE @json1 VARCHAR(MAX); DECLARE @json2 VARCHAR(MAX)

 SET @json1 =
 (
             select distinct
                [Category]
               ,[Brand]
               ,[Geo]
               ,[Owner] as [EmailRecipent]
             from 
                [schema].[table1]
             where
                [Owner] = @emailrecipient
                and isnull([Category], '') = @category
                and isnull([Brand], '') = @brand
                and isnull([Geo], '') = @geo
             for json path, INCLUDE_NULL_VALUES 
 )
 SET @json2 =
 (
             select
                [URL]
               ,[Start - End Date]
               ,[Media Channels]
             from [schema].[table2]
             where
                 isnull([CatDescription], '') like @category
                 and isnull([BrandDescription], '') like @brand
                 and isnull([Restriction Markets], '') like @geo
             for json path, INCLUDE_NULL_VALUES 
 )

 If @json1 IS NOT NULL OR @json2 IS NOT NULL
 BEGIN

     SELECT 
             REPLACE(
                 REPLACE(@json_construct,'{X}', isnull(@json1, '[]')),
             '{Y}', isnull(@json2,'[]'))
         AS json_output;
END
end

Answer 2

IF @json2 is null and @json1 is null
return

Answer 3

resolved by combining the answers of @Tom Phillips and @brenda grossnickle

the last part of a stored procedure is like:

......  
  
)  
  
	If @json1 IS NULL or @json2 IS NULL return  
	begin  
	SELECT   
			REPLACE(  
				REPLACE(@json_construct,'{X}', isnull(@json1, '[]')),  
			'{Y}', isnull(@json2,'[]'))  
		AS json_output;  
	end  
end  
GO  

Thank you guys!