SQLXML : How To Save XML Query Results to a File Using BCP

One way to save your XML query results to the file system is by using bcp (bulk copy program).

Be aware of the following before deciding to use bcp for your regular export requirements:

  • bcp is a program external to SSMS. If you need to use this from within your scripts, you will need to enable xp_cmdshell. xp_cmdshell is an extended stored procedure that allows external command line processes to be executed from within SQL Server. Enabling xp_cmdshell is considered to be a big no no in terms of security because this opens up avenues for malicious attacks through SQL Server.
  • Depending on how much data you need to export, you may need to batch your export to overcome rowsize limitations of bcp.

If you intend to use bcp from within SSMS, you will need to enable xp_cmdshell first, otherwise you will get the following error:

Msg 15281, Level 16, State 1, Procedure xp_cmdshell, Line 1 SQL Server blocked access to procedure ‘sys.xp_cmdshell’ of component ‘xp_cmdshell’ because this component is turned off as part of the security configuration for this server. A system administrator can enable the use of ‘xp_cmdshell’ by using sp_configure. For more information about enabling ‘xp_cmdshell’, see “Surface Area Configuration” in SQL Server Books Online.

The following example walks you through enabling xp_cmdshell, and using bcp from within SSMS to save your XML query to an external file.

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SQLXML : How to Bulk Load XML From a File Using OPENXML

Using OPENXML you can import XML documents into an XML variable, or into a table that has XML columns. The following is an example:

   1: -- ==========================================================================
   2: -- Object       : OPENXML1.sql
   3: -- Object Type  : Script
   4: -- Description  : Various examples
   5: -- Developer    : Donabel Santos
   6: -- Origin       : 2008/08/17
   7: -- Last Modified: 2008/10/04
   8: -- Notes        : 
   9: -- ==========================================================================
  10:  
  11: -- bulk load
  12: -- For this example, XML file must be saved in C:\
  13: -- XML file also should specify UTF-8 encoding, ie:
  14: -- <?xml version="1.0" encoding="UTF-8"?>
  15:  
  16: DECLARE @XMLTable TABLE
  17: (
  18:    xmlcol XML
  19: )
  20:  
  21: INSERT INTO @XMLTable(xmlcol)
  22: SELECT
  23:     InvoicesXML
  24: FROM
  25: (
  26:     SELECT * 
  27:     FROM OPENROWSET(BULK 'c:\invoice.xml',SINGLE_BLOB) AS Invoices
  28: ) AS Invoices(InvoicesXML)
  29:  
  30: SELECT *
  31: FROM @XMLTable
  32:  
  33:  

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Generating XSD from an XML File

To create a schema (XSD) from an XML file, you can use a command line tool that comes with Visual Studio called xsd.exe (located in Install Directory\Microsoft Visual Studio 8\SDK\v2.0\Bin). If you’re running Visual Studio 2008, your path will be different.

Usage:

xsd.exe -
    Utility to generate schema or class files from given source.
xsd.exe <schema>.xsd /classes|dataset [/e:] [/l:] [/n:] [/o:] [/s] [/uri:]
xsd.exe <assembly>.dll|.exe [/outputdir:] [/type: [...]]
xsd.exe <instance>.xml [/outputdir:]
xsd.exe <schema>.xdr [/outputdir:]

Sample invocation:

C:\temp>xsd invoice.xml
Microsoft (R) Xml Schemas/DataTypes support utility
[Microsoft (R) .NET Framework, Version 2.0.50727.42]
Copyright (C) Microsoft Corporation. All rights reserved.
Writing file 'C:\temp\invoice.xsd'.
C:\temp>

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