SQL Server 2000 Stored Procedure & XML Programming in .NET

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SQL Server 2000 Stored Procedure & XML Programming
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Server-side vs. client-side XML processing
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The easiest way to force client-side XML conversion is to set the Run On The Client option for the virtual directory in the IIS Virtual Directory Management for SQLXML tool (see Figure 14-26).
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Using Templates
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The result of a query referenced in a template will be converted to XML data on the client if you add a client-side-xml attribute to the template and set the value to "1":
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<root xmlns:sql='urn:schemas-microsoft-com:xml-sql' client-side-xml = "1"> <sql:query> select * from Equipment for XML auto, elements </sql:query> </root>
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14: Publishing Information Using SQLXML
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Setting the Run On The Client option for the virtual directory
Using SQLXML Managed Classes
You can force a .NET application that is using SQLXML managed class to access database information to process record set to XML on the client side if you set the ClientSideXml property of the SqlXmlCommand managed class to True:
Imports System Imports System.IO Imports Microsoft.Data.SqlXml 'The SQLXML managed classes Module Module1 Sub Main() 'Instantiate the SqlXmlCommand object and the connection Dim objSqlXmlCmd As New SqlXmlCommand("Provider=SQLOLEDB;" _
SQL Server 2000 Stored Procedure & XML Programming
& "Server=(local)\SS2K;Database=Asset;"_ & "Integrated Security=SSPI") 'Set the query objSqlXmlCmd.CommandType = SqlXmlCommandType.Sql objSqlXmlCmd.CommandText = "SELECT * FROM Inventory FOR XML ROW" 'convert to XML on the client objSqlXmlCmd.ClientSideXml = True 'write result to file Dim objResult As New FileStream("Inventory.xml", FileMode.Create) objSqlXmlCmd = objSqlXmlCmd.ExecuteStream(objResult) objResult.Close() End Sub End Module
Processing of Queries with the For XML Clause
Processing queries with a For XML clause on the client is very similar to processing them on the server, but there are a few differences: It is illegal to try to return multiple result sets when you are trying to process the queries on the client. You can use aggregations and the Group By clause:
select EquipmentId, Count(*) [Count] from dbo.Inventory Group By EquipmentId for XML ROW
All sql_variant fields are converted to Unicode strings: their base types are ignored. If you try to process a query that has a For XML Auto clause on the client, SQL Server will process it on the server. When you want to process the query on the client, use the For XML Nested clause instead. It is very similar to For XML Auto. The For XML Nested clause, although very similar to For XML Auto, has some important differences:
14: Publishing Information Using SQLXML
You can add it to a string that executes a stored procedure:
exec prListEquipment2 FOR XML Nested
The resulting XML fragment will have element names based on base tables, not on their aliases or view names. Keywords behind For XML Nested do not have to be separated with commas. It is perfectly legal to separate them with spaces only:
select * from dbo.Inventory FOR XML NESTED XMLDATA ELEMENTS
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Modifying Databases Using SQLXML
IN THIS CHAPTER:
OpenXML() UpdateGrams DiffGrams SQLXML BulkLoad XML Web Services
CHAPTER
SQL Server 2000 Stored Procedure & XML Programming
QLXML supports several methods for modifying data:
OpenXML(), in association with modification statements UpdateGrams DiffGrams SQLXML BulkLoad XML Web Services and SOAP
OpenXML()
OpenXML() is a new function in Transact-SQL. It provides access to an in-memory rowset similar to a view or a table. Since it is a rowset provider, OpenXML() can be used in Transact-SQL statements in any place where a table, view, or rowset provider such as OpenRowset() can be used. It is a replacement for DOM that Transact-SQL developers can use to parse, access, and return the content of an XML document. By itself, it cannot modify data, but it can be part of a modification statement.
Document Preparation
Before an XML document can be accessed using OpenXML(), the document must be loaded into memory using sp_xml_preparedocument. This stored procedure has the following syntax:
exec sp_xml_preparedocument hdoc OUTPUT [, xmltext] [, xpath_namespaces]
The stored procedure reads the XML document provided in xmltext, parses the document using the MSXML parser, and places the document into an in-memory structure that is ready for use with the OpenXML() statement. This structure is a tree that contains assorted nodes such as elements, attributes, comments, and text. The stored procedure returns a handle for the XML document hdoc that OpenXML() can use to access the information, and that sp_xml_removedocument uses to remove the document from memory.
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