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Typically, there is no need to use SQLXML to retrieve a data set. You can use standard methods like ADO.NET to achieve that. SqlXmlAdapter is more important in cases in which a stored procedure or template already has a For XML clause (or when you want to use it to modify data, but that is a topic for the next chapter).
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14: Publishing Information Using SQLXML
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Developers are able to retrieve data in XML format without SQLXML. They can use standard relational access methods based on ADO.NET.
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The SqlCommand class is used in ADO.NET to execute SQL commands against a database server. To use it against SQL Server, you must include a reference to System.Data.SqlClient in the application. You need an instantiated SqlConnection object and SQL query to define the SqlCommand object. The SqlCommand class s ExecuteXmlReader method can be used to pass the result of SQL queries with a For XML clause to an instance of the XmlTextReader object. In the following example, the XmlTextReader object is used to write the XML result through a FileStream object to a file:
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'SqlCommand_Simple Imports System Imports System.IO Imports System.Data Imports System.Data.SqlClient Imports System.Xml Module Module1 Sub Main() 'Instantiate the SqlCommand object and the connection Dim objConn As New SqlConnection("Server=(local)\SS2K;" _ & "Database=Asset;" _ & "Integrated Security=SSPI") objConn.Open() Dim objCmd As New SqlCommand( _ "SELECT * FROM Inventory FOR XML AUTO", objConn) 'read the result as XML Dim objXMLReader As XmlTextReader objXMLReader = objCmd.ExecuteXmlReader() 'prepare the destination file Dim objFile As New FileStream("Inventory.xml", FileMode.Create) Dim objStrmWriter As New StreamWriter(objFile)
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'skip processing instructions, etc. objXMLReader.MoveToContent() 'write xml line by line to file While objXMLReader.IsStartElement objStrmWriter.WriteLine(objXMLReader.ReadOuterXml) End While objStrmWriter.Close() objFile.Close() objXMLReader.Close() objConn.Close() End Sub End Module
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Using DataSet Objects
DataSet objects from ADO.NET are typically used in .NET applications to access the result of a relational query. One of their features is also to serialize the result as XML using the WriteXML method. The query that the DataSet object is based upon does not need to contain a For XML clause. In the following example, a DataSet object is created using SqlConnection, SqlCommand, and SqlAdapter object instances. The WriteXML method is then used to write XML data without schema in a file to a FileStream object.
'SqlCommand_DataSet2XML Imports System Imports System.IO Imports System.Data Imports System.Data.SqlClient Imports System.Xml Module Module1 Sub Main() 'Instantiate the SqlCommand object and the connection Dim objConn As New SqlConnection("Server=(local)\SS2K;" _ & "Database=Asset;" _ & "Integrated Security=SSPI") objConn.Open() Dim objCmd As New SqlCommand( _ "SELECT * FROM Inventory", objConn)
14: Publishing Information Using SQLXML
Dim objAdpt As New SqlDataAdapter(objCmd) Dim objDs As New DataSet("CompleteInventory") objAdpt.Fill(objDs, "Inventory") 'prepare the destination file Dim objFile As New FileStream("Inventory.xml", FileMode.Create) Dim objStrmWriter As New StreamWriter(objFile) 'write dataset objDs.WriteXml(objStrmWriter, XmlWriteMode.IgnoreSchema) objStrmWriter.Close() objFile.Close() objConn.Close() End Sub End Module
Client-Side XML Processing
Since SQLXML 2.0, it has been possible to move XML processing from SQL Server to the client (meaning in this case an application on the client or an object in the middleware or on the web server). In this scenario (see Figure 14-25), a client application executes a SQL query that includes a For XML clause. The SQLXMLOLEDB provider strips the For XML clause out and sends the rest of the query down the line. SQLOLEDB then passes the SQL query to SQL Server. After execution, SQL Server returns a result set. SQLOLEDB passes the recordset to the SQLXMLOLEDB provider, which performs the conversion to an XML document based on the For XML clause and returns the XML response to the caller. Client-side processing is important in the following scenarios: To move processing from SQL Server to a middleware component or web server To reduce network traffic (an XML response is large, because it contains metadata) To use SQLXML against SQL Server 7.0 To access existing stored procedures and queries that do not contain a For XML clause
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