Strange behaviour of sp_executesql with xml parameter

Posted on 2016-08-08
Last Modified: 2016-10-09
I am getting various results from 'EXEC sp_executesql @sql, N'@xml xml', @xml', depending on how I construct the @sql variable. Only 2 of these constructs are successful. All others fail, with different error messages. Whether successful or not, the only thing that changes is the number of repetitions of a single field in the SELECT clause, and whether they are on a single line, or separated by carriage returns.

The general construct is:

   SET @sql='
   (repeated field)
   FROM @xml.nodes(''/row'') As t(c)
   INNER JOIN [SQLRONA].[dbo].[T_item] ON [SQLRONA].[dbo].[T_item].[CodeRona]=t.c.value(''@sk'',''char(8)'')'

First, here are the 2 field repetitions that work:

   1) [SQLRONA].[dbo].[T_item].[CodeRona] (N.B.: Not a repetition. Just a single field.)
   2) [SQLRONA].[dbo].[T_item].[CodeRona], [SQLRONA].[dbo].[T_item].[CodeRona]

Following are some of the failing repetitions, and their error messages:

   3) [SQLRONA].[dbo].[T_item].[CodeRona], [SQLRONA].[dbo].[T_item].[CodeRona], [SQLRONA].[dbo].[T_item].[CodeRona]
       Incorrect syntax near '('.

   4) [SQLRONA].[dbo].[T_item].[CodeRona],
       Unclosed quotation mark after the character string 'Code'. Incorrect syntax near 'Code'.

   5) [SQLRONA].[dbo].[T_item].[CodeRona], [SQLRONA].[dbo].[T_item].[CodeRona], [SQLRONA].[dbo].[T_item].[CodeRona], [SQLRONA].[dbo].[T_item].[CodeRona]
       An expression of non-boolean type specified in a context where a condition is expected, near 'SQLRONA'.

   6) [SQLRONA].[dbo].[T_item].[CodeRona],
       Unclosed quotation mark after the character string 'db'. Incorrect syntax near 'db'.
Can anyone explain why sp_executesql is behaving like that?
Question by:J2015
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 3
LVL 26

Expert Comment

by:Shaun Kline
ID: 41747472
The format for sp_executesql does not look correct.

By definition, it should be:
'EXEC sp_executesql @sql, N'@xml xml', @xml = <value>'

Where are you setting the passed in parameter equal to a value?
LVL 26

Expert Comment

by:Shaun Kline
ID: 41747474
You can see examples at Microsoft's page for sp_executesql:
LVL 26

Expert Comment

by:Shaun Kline
ID: 41747477
Correction to the definition. There shouldn't have been an extra apostrophe at the end:
'EXEC sp_executesql @sql, N'@xml xml', @xml = <value>
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!


Author Comment

ID: 41747523
Here's the entire code:

ALTER PROCEDURE [dbo].[usp_FetchXml] @List varchar(Max)
DECLARE @xml xml, @sql nvarchar(255)
      SET @xml=CAST(@List As XML)
      SET @sql=' SELECT [SQLRONA].[dbo].[T_item].[CodeRona] FROM @xml.nodes(''/row'') As t(c)
      INNER JOIN [SQLRONA].[dbo].[T_item]
      ON [SQLRONA].[dbo].[T_item].[CodeRona]=t.c.value(''@sk'',''char(8)'')'
      EXEC sp_executesql @sql, N'@xml xml', @xml

I call the stored procedure with the following query:

usp_FetchXml '<row sk="7805059" /> <row sk="0001982" /> <row sk="11635000" /> <row sk="11635001" />'

Author Comment

ID: 41747552
I forgot to mention: I am using SQL Server 2008 R2.
LVL 26

Expert Comment

by:Shaun Kline
ID: 41747680
This line:
EXEC sp_executesql @sql, N'@xml xml', @xml

should be:
EXEC sp_executesql @sql, N'@xml xml', @xml = @xml

To make it clearer:
EXEC sp_executesql @sql, N'@xmlData xml', @xmlData = @xml

Accepted Solution

J2015 earned 0 total points
ID: 41747851
I found why it fails. The line DECLARE @xml xml, @sql nvarchar(255)
should be DECLARE @xml xml, @sql nvarchar(MAX).


Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In this article I will describe the Detach & Attach method as one possible migration process and I will add the extra tasks needed for an upgrade when and where is applied so it will cover all.
In this article we will get to know that how can we recover deleted data if it happens accidently. We really can recover deleted rows if we know the time when data is deleted by using the transaction log.
There are cases when e.g. an IT administrator wants to have full access and view into selected mailboxes on Exchange server, directly from his own email account in Outlook or Outlook Web Access. This proves useful when for example administrator want…
In this video we outline the Physical Segments view of NetCrunch network monitor. By following this brief how-to video, you will be able to learn how NetCrunch visualizes your network, how granular is the information collected, as well as where to f…

624 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question