How can I pass xml data from one sproc to another? - sql

Question

I have 2 sprocs for an assignment, what I'm trying to do is pass the xml output from one sproc to another and put it in a variable, I know ex1.xml_sp1 is returning an int while calling it with EXEC and obviously when trying to select this it returns null because #x is xml data type.
What I want to do is retrieve and store the xml data from sproc 1 in to #x in sproc 2.
Is there any way to do this?
sproc 1:
ALTER PROC [ex1].[xml_sp1]
#careteamid int
as
select CareTeams.CareTeamID, Doctors.DoctorID, Doctors.DoctorName,
CareTeamDoctors.DateJoined, CareTeamDoctors.CurrentMember
from dbo.CareTeamTbl as CareTeams
inner join dbo.CareTeamDoctorTbl as CareTeamDoctors on
CareTeams.CareTeamID = CareTeamDoctors.CareTeamID
inner join dbo.DoctorTbl as Doctors on
CareTeamDoctors.DoctorID=CareTeamDoctors.DoctorID
where CareTeamDoctors.CareTeamID = #careteamid
and CareTeamDoctors.DoctorID = Doctors.DoctorID
for xml auto, root('thedata')
sproc 2:
ALTER PROC [ex1].[xml_sp2]
#careteamid int
as
declare #x xml
exec #x = ex1.xml_sp1
#careteamid = #careteamid
select #x as XMLData

Answer 1

I want to do is retrieve and store the xml data from sproc 1 in to #x in sproc 2.
You could achieve it very easily using OUTPUT parameters:
CREATE PROCEDURE [xml_sp1]
#careteamid INT,
#xml_output XML OUTPUT
AS
BEGIN
SET #xml_output = (SELECT * FROM ... FOR XML AUTO, root('thedata'));
END;
GO
CREATE PROCEDURE [xml_sp2]
#careteamid INT
AS
BEGIN
DECLARE #x XML;
EXEC [xml_sp1]
#careteamid,
#x OUTPUT;
SELECT #x AS XMLData;
END;
GO
And final call:
EXEC [xml_sp2] #careteamid = 1;
LiveDemo
Consider using BEGIN/END block and end each statement with ; to avoid possible nasty problems.
The full list of possible sharing data methods How to Share Data between Stored Procedures by Erland Sommarskog

Answer 2

For the return value (i.e. EXEC #ReturnValue = StoredProcName...;), INT is the only datatype allowed. If this needs to really stay as a Stored Procedure then you can either use an OUTPUT variable or create a temp table or table variable in the second Stored Procedure and do INSERT INTO ... EXEC StoredProc1;.
However, given that the first Stored Procedure is only doing a simple SELECT statement, you would be far better off converting this to be an Inline Table-Valued Function (iTVF) as follows:
CREATE FUNCTION dbo.GetData (#CareTeamID INT)
RETURNS TABLE
AS RETURN
SELECT tab.col AS [CareData]
FROM (
SELECT CareTeams.CareTeamID, Doctors.DoctorID, Doctors.DoctorName,
CareTeamDoctors.DateJoined, CareTeamDoctors.CurrentMember
FROM dbo.CareTeamTbl as CareTeams
INNER JOIN dbo.CareTeamDoctorTbl as CareTeamDoctors
ON CareTeams.CareTeamID = CareTeamDoctors.CareTeamID
INNER JOIN dbo.DoctorTbl as Doctors
ON CareTeamDoctors.DoctorID=CareTeamDoctors.DoctorID
WHERE CareTeamDoctors.CareTeamID = #CareTeamID
AND CareTeamDoctors.DoctorID = Doctors.DoctorID
FOR XML AUTO, ROOT('thedata'), TYPE -- "TYPE" causes result to be XML and not NVARCHAR
) tab(col);
Then just change the second stored procedure to be:
SELECT care.CareData AS [XMLData]
FROM dbo.GetData(#CareTeamID);
Or, if you actually need to make use of that XML data in the second Stored Procedure, do the following:
DECLARE #TempData XML;
SELECT #TempData = care.CareData
FROM dbo.GetData(#CareTeamID);
Finally, if you need the XML data to actually be of the XML datatype coming out of that iTVF (or even if you keep it as a Stored Procedure), then you need to add the TYPE option to the FOR XML clause, else what is returned is a string / NVARCHAR(MAX):
FOR XML AUTO, ROOT ('thedata'), TYPE

Answer 3

Why not try this instead of assigning output of sp1 directly
declare #t table
(
val xml
)
insert into #t
exec ex1.xml_sp1
#careteamid = #careteamid
select * from #t

Answer 4

Will this work?
declare #xml xml
set #xml = (select *
from tableABC
for xml auto, elements)
And then pass that variable to another sproc?
I go the answer from here
How to insert FOR AUTO XML result into table?.
Seems to me the idea is similar, or should work similar.