I am trying to generate a table containing one row that contains the XML of each temporary table in a stored procedure.
The problem is when the table is empty the FOR XML PATH('RS'), root('OR_RS')
returns null
.
What I want is: when the table is empty, return the structure of this table something like this :
<OR_RS>
<ContactCode></ContactCode>
<EmailPaper></EmailPaper>
<ShortEmail></ShortEmail>
<WebSite></WebSite>
<Providers></Providers>
</OR_RS>
I have tried to do this :
-- ,ISNULL( (SELECT * FROM #OR_RS FOR XML PATH('RS'), root('OR_RS')), (SELECT ISNULL(ContactCode,'') , ISNULL(EmailPaper,'') , ISNULL(ShortEmail,'') , ISNULL(WebSite,'') , ISNULL(Providers,'') FROM #OR_RS FOR XML RAW)) as OR_RS
but it returns always Null
:
SELECT 1 as Id, (SELECT * FROM #OR_MK FOR XML PATH('MK'), root('OR_MK') ) as OR_MK
,(SELECT * FROM #OR_CA FOR XML PATH('CA'), root('OR_CA') ) as OR_CA
-- ,ISNULL( (SELECT * FROM #OR_RS FOR XML PATH('RS'), root('OR_RS')), (SELECT ISNULL(ContactCode,'') , ISNULL(EmailPaper,'') , ISNULL(ShortEmail,'') , ISNULL(WebSite,'') , ISNULL(Providers,'') FROM #OR_RS FOR XML AUTO)) as OR_RS
,(SELECT * FROM #OR_RS FOR XML PATH('RS'), root('OR_RS')) as OR_RS
,(SELECT * FROM #OR_DC FOR XML PATH('DC'), root('OR_DC') ) as OR_DC
,(SELECT * FROM #BENEFICIARY FOR XML PATH('BEN'), root('BENEFICIARY') ) as BENEFICIARY
,(SELECT * FROM #MK_REPORT for XML PATH('REP'), root('MK_REPORT')) as MK_REPORT
Whatever you try to do with this...
You might want to have a look at sp_describe_first_result_set , but, since this is a procedure, it will not be that easy to get its result into your query...
You can use a trick (a RIGHT JOIN
) to enforce a resultset. And with ELEMENTS XSINIL
you force the engine to include the column in any case. Otherwise XML takes missing elements as NULL
, so your empty result would not be written into the result XML at all otherwise. Try this:
DECLARE @tbl TABLE(ID INT IDENTITY,SomeValue INT,SomeString VARCHAR(100));
SELECT *
FROM @tbl
RIGHT JOIN (SELECT 1 AS x) AS tbl ON 1=1
FOR XML RAW, ELEMENTS XSINIL
The result
<row xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<ID xsi:nil="true" />
<SomeValue xsi:nil="true" />
<SomeString xsi:nil="true" />
<x>1</x>
</row>
If you want to get more details, you might add ,XMLDATA
or ,XMLSCHEMA
to generate full meta data.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.