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When connecting to a database by using the SQLXML classes, you must use the SqlOleDB provider.
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To use SQLXML to execute an XPATH query against an annotated XSD schema, use the following code:
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SqlXmlCommand cmd = new SqlXmlCommand("connection_string"); cmd.CommandText = "XPATH_expression"; cmd.CommandType = SqlXmlCommandType.XPath; cmd.SchemaPath = "Annotated_XML_Schema_file.xml"; Stream s = cmd.ExecuteStream();
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Lesson 3: Retrieving XML Data by Using SQL Server Middle-Tier Technologies
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To execute an XML view file, use the following code:
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SqlXmlCommand cmd = new SqlXmlCommand("connection_string"); cmd.CommandText = "XML_View_file.xml"; cmd.CommandType = SqlXmlCommandType.TemplateFile; System.Xml.XmlReader xr = cmd.ExecuteXmlReader();
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The SqlXmlCommand.CommandType property indicates the type of command that will be processed next. Note that the result of executing an XML view file can be processed by either a System.IO.Stream object or a System.Xml.XmlReader object. The following example shows how to consume the result by using a System.Data.DataSet and how to pass input parameters to an XML view file:
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SqlXmlCommand cmd = new SqlXmlCommand("connection_string"); cmd.CommandText = "XML_View_file.xml"; cmd.CommandType = SqlXmlCommandType.TemplateFile; SqlXmlParameter param = cmd.CreateParameter(); param.Name = "@param_name"; param.Value = "param_value"; SqlXmlAdapter da = new SqlXmlAdapter(cmd); System.Data.DataSet ds = new System.Data.DataSet(); da.Fill(ds);
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The main benefit of using XML views and annotated XML schemas to query XML data is that they are easy to maintain because they are stored as files on the file system; any changes you make to the queries do not require recompiling the application. Another benefit is that the XML rendering happens where the XML views and annotated XML schemas are deployed, which can be on a different machine than the database server.
PRACTICE
Use SQLXML to Query the UniversalLog Table
In this practice, you create an annotated XSD schema for the UniversalLog table. Then you execute multiple XPATH queries directly from the annotated XSD schema by using an XML view file. For solutions to the steps in this practice, see the Practice Files\8\Lesson 3\SQLXMLViews\SQLXMLViews.csproj Visual Studio 2005 project file on the companion CD. 1. Annotate the following XSD schema with the proper keywords to make this schema valid as an SQLXML-annotated XSD schema for the UniversalLog table:
< xml version="1.0" > <xsd:schema id="UniversalLogSchema" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <xsd:element name="Log"> <xsd:complexType>
8
Managing XML Data
<xsd:sequence> <xsd:element name="Application" /> <xsd:element name="Details"/> </xsd:sequence> <xsd:attribute name="ID"/> <xsd:attribute name="Timestamp" /> </xsd:complexType> </xsd:element> </xsd:schema>
The Application element maps to the ApplicationName column. The Details element maps to the LogRecord column. Because it is an XMLtyped column, it must be marked with the sql:datatype="xml" attribute in the annotated XSD schema. The ID attribute maps to the ID column. The Timestamp attribute maps to the LogDateTime column.
2. Create an XML view file with the following XPATH query: Log[Application= "SalesApp"] 3. Create a console application in Visual Studio 2005 to execute the XPATH query directly against the annotated XSD schema or through the XML view file. 4. To create a console application, open Visual Studio 2005 or Visual C# 2005 Express Edition. 5. Point to New in the File Menu and choose Project. 6. In the New Project dialog box, select the Console Application template and click OK. 7. In the Project menu, choose Add Reference. When the Add Reference dialog box opens, scroll down and select Microsoft.Data.SqlXml and click OK. 8. Add the following code at the beginning of the file:
using Microsoft.Data.SqlXml; using System.IO;
9. Add the following code inside the Main method:
string connectionString = "Provider=sqloledb; Data Source=(local);"; connectionString += "Initial Catalog=TK4318; User Id=sa;"; SqlXmlCommand cmd = new SqlXmlCommand(connectionString); cmd.CommandText = "Log"; cmd.CommandType = SqlXmlCommandType.XPath; cmd.SchemaPath = "UniversalLogSchema.xsd"; cmd.RootTag = "UniversalLog"; StreamReader r = new StreamReader(cmd.ExecuteStream()); Console.WriteLine(r.ReadToEnd()); Console.ReadLine();
Lesson 3: Retrieving XML Data by Using SQL Server Middle-Tier Technologies
Notice that for this code to work, you must modify the connection string to your specific environment. Set the Data Source to point to the correct SQL Server instance that you will be connecting, and set the User ID and Password to a correct credential with permissions to execute queries on the TK4318 database. 10. Make sure that the connection string in the code points to the correct server and is using the correct identity to connect to the SQL Server instance. 11. Make sure to copy the UniversalLogSchema.xsd file and the UniversalLogView.xml file to the C:\8\Lesson 3\SQLXMLViews\bin\Debug directory before running it. 12. Press F5 to start running the sample application.
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