Solved

Strange behaviour of sp_executesql with xml parameter

Posted on 2016-08-08
8
14 Views
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='
   SELECT
   (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],
       [SQLRONA].[dbo].[T_item].[CodeRona],
       [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],
       [SQLRONA].[dbo].[T_item].[CodeRona],
       [SQLRONA].[dbo].[T_item].[CodeRona],
       [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?
0
Comment
Question by:J2015
  • 4
  • 3
8 Comments
 
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?
0
 
LVL 26

Expert Comment

by:Shaun Kline
ID: 41747474
You can see examples at Microsoft's page for sp_executesql:
https://msdn.microsoft.com/en-us/library/ms188001.aspx
0
 
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>
0
Control application downtime with dependency maps

Visualize the interdependencies between application components better with Applications Manager's automated application discovery and dependency mapping feature. Resolve performance issues faster by quickly isolating problematic components.

 

Author Comment

by:J2015
ID: 41747523
Here's the entire code:

USE [SQLXRAY_FE_EXTENSION]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[usp_FetchXml] @List varchar(Max)
AS
DECLARE @xml xml, @sql nvarchar(255)
BEGIN
      SET NOCOUNT ON
      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
END

I call the stored procedure with the following query:

usp_FetchXml '<row sk="7805059" /> <row sk="0001982" /> <row sk="11635000" /> <row sk="11635001" />'
0
 

Author Comment

by:J2015
ID: 41747552
I forgot to mention: I am using SQL Server 2008 R2.
0
 
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
0
 

Accepted Solution

by:
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).

Thanks.
0

Featured Post

Zoho SalesIQ

Hassle-free live chat software re-imagined for business growth. 2 users, always free.

Question has a verified solution.

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

Suggested Solutions

by Mark Wills Attending one of Rob Farley's seminars the other day, I heard the phrase "The Accidental DBA" and fell in love with it. It got me thinking about the plight of the newcomer to SQL Server...  So if you are the accidental DBA, or, simp…
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.
This tutorial demonstrates a quick way of adding group price to multiple Magento products.
Concerto provides fully managed cloud services and the expertise to provide an easy and reliable route to the cloud. Our best-in-class solutions help you address the toughest IT challenges, find new efficiencies and deliver the best application expe…

914 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

Need Help in Real-Time?

Connect with top rated Experts

19 Experts available now in Live!

Get 1:1 Help Now