Need for two level reference in T-SQL - sql

Question

By using the dynamic SQL, I created a variable name like this:
set #tempresultStore = 'Temp'+#colVar
Now, #tempresultstore has the value 'TempMiddleName', then I declared this variable named TempMiddleName and assigned the value in the same line in dynamic sql query and executed.
The code is as follows :(Scroll down to code line with comment to follow where the problem is)
CREATE Procedure OutputProcedure
#LastNameFromUser nvarchar(20) = null,
#LastNameFromTable nvarchar(20),
#MiddleNameFromUser nvarchar(20) = null,
#MiddleNameFromTable nvarchar(20) = null,
#CityFromUser nvarchar(20) = null,
#CityFromTable nvarchar(20) = null,
#Percentage int out
AS
BEGIN
SELECT #MiddleNameFromTable AS'middlename'
select #LastNameFromTable as 'LASTNAMEFROMTABLE'
select #LastNameFromUser as 'LASTNAMEFROMUser'
select 'OUTPUTPROCEDURECALLED'
declare #maxvalue int , #finalpercentage int = 0
DECLARE #variableTable TABLE
(
idx int identity(1,1),
matchvalue nvarchar(15)
)
INSERT INTO #variableTable(matchvalue) values ('MiddleName')
INSERT INTO #variableTable(matchvalue) values ('LastName')
INSERT INTO #variableTable(matchvalue) values ('City')
SELECT * FROM #variableTable
DECLARE #counter int
declare #sql nvarchar(100)
declare #sql2 nvarchar(25), #finalResult nvarchar(100)
set #finalResult = 0;
declare #sql3 nvarchar(300), #sql4 nvarchar(15), #tempresultStore nvarchar(20), #temp int, #temp2 int, #average int
DECLARE #ParmeterDefinition nvarchar(500);
set #ParmeterDefinition =
N'#LastNameFromUsnvarchar(20),
#LastNameFromTab nvarchar(20),
#MiddleNameFromUs nvarchar(20),
#MiddleNameFromTab nvarchar(20),
#CityFromUs nvarchar(20),
#CityFromTab nvarchar(20),
#Percent int out'
SET #counter = 1
SELECT #maxvalue = (SELECT MAX(idx) FROM #variableTable)
select #maxvalue as 'MAXVALUE'
WHILE(#counter < #maxvalue)
BEGIN
DECLARE #colVar nvarchar(15)
SELECT #colVar = matchvalue FROM #variableTable WHERE idx = #counter
set #tempresultStore = 'Temp'+#colVar --here
SELECT #tempresultStore AS 'FINALCUTPART'
select 'JUSTBEFORSQL'
set #sql3 = 'declare #Temp' + #colVar + ' int = dbo.[Match' + #colVar + '](' + #colVar + 'FromUser,' + #colVar + 'FromTable, 0)'
select #sql3 as 'check sql query formed'
EXEC sp_executesql #sql3,
#ParmeterDefinition,
#LastNameFromUs = #LastNameFromUser,
#LastNameFromTab = #LastNameFromTable,
#MiddleNameFromUs = #MiddleNameFromUser,
#MiddleNameFromTab = #MiddleNameFromTable,
#CityFromUs = #CityFromUser,
#CityFromTab = #CityFromTable,
#Percent = #Percentage out
select #Percentage AS 'PERCENTRETRIVED'
set #finalResult = #finalResult + #Percentage /*here #Percentage always remains 0. It is the value returned by the UDF called by the dynamic SQL above.The function does return the value but probably I fail to store it correctly.*/
select #finalResult as 'SUM'
SET #counter = #counter + 1
select #counter as 'COUNTERVALUE'
END
set #finalpercentage = #finalResult/#maxvalue
SELECT #finalpercentage AS 'FINALRESULT'
RETURN
END
Go
How do I access the int value stored in variable called #TempMIddleName

Answer 1

It should work with output keyword. No need for creating table. I don't know but your code is not correct. You have output parameter #Percent and assign value of function to #TempMiddleName, then you should have not a #Percent as Output but #TempMiddleName.
You get dynamic SQL
declare #TempMiddleName int = dbo.[MatchMiddleName](MiddleNameFromUser,MiddleNameFromTable, 0)
I had answered you once, that you miss # before your variables.
Also you have provided variable #Percent(and others as well) for dynamic query, but you don't assign any value to it. Try changing
SET #sql3 = 'declare #Temp' + #colVar + ' int = dbo.[Match' + #colVar + '](' + #colVar + 'FromUser,' + #colVar + 'FromTable, 0)'
to
SET #sql3 = 'select #Percent = 1'
and you will see that 1 is returned as supposed to.
Also you have error here. Split first parameter from its type
set #ParmeterDefinition =
N'#LastNameFromUsnvarchar(20),
set #ParmeterDefinition =
N'#LastNameFromUs nvarchar(20),

Answer 2

You would need to dynamically create a temporary table, and access it's value by selecting the top 1 value from it. Something like the following;
CREATE TABLE #ResultValue (Value Varchar(200))
DECLARE #DynamicSql NVarchar(MAX) = ''
SELECT #DynamicSql = '
DECLARE #tempresultStore Varchar(50)
DECLARE #colVar Varchar(50) = ''MiddleName''
SET #tempresultStore = ''Temp'' + #colVar
insert into #ResultValue
select #tempresultStore
'
EXEC sp_sqlexec #DynamicSql
SELECT * FROM #ResultValue
DROP TABLE #ResultValue
If you paste all your code we might try to amend it for you.