Managing XML Data in .NET

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Bulk Loading XML Files
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In this practice, you use OPENXML and SQLXML Bulk Load to upload two XML files into the database. Then you query the data in the UniversalLog table to build some reports. The queries require you to shred XML into relational data by using the nodes() method of the XML data type.
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The Practice Files\8\Lesson 5\CompleteLesson5.sql file provides the solution for Practice 1 and Practice 3 in this lesson.
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Practice 1: Use OPENXML to Load XML Data
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The UniversalLog administrator found an XML file that contains old data that must be uploaded into the database. The XML file must be loaded into memory by using the SQLXML XML stored procedures. You then need to insert the data into the UniversalLog table. 1. The C:\8\Lesson5\UniversalLog.xml file contains 500 log entries that you need to upload into the UniversalLog table. 2. Load the UniversalLog.xml file into a XML-typed variable in SQL Server. (Lesson 1 covered how to load XML files by using the OPENROWSET function in Transact-SQL.) 3. Use the sp_xml_preparedocument stored procedure to load the XML data into memory. 4. Issue an INSERT..SELECT statement to insert into the UniversalLog table the data read by using OPENXML. Remember that you must use explicit mapping in the OPENXML declaration because the XML is in a different format. 5. Use the sp_xml_removedocument stored procedure to clean up the server memory. 6. Execute the queries and then use a SELECT COUNT statement to validate that the data has been inserted into the table.
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NOTE
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The Practice Files\8\Lesson 5\ BulkLoad\SQLXMLBulkLoad.csproj Visual Studio project file provides the solution for Practice 2 in this lesson.
Lesson 5: Converting Between XML Data and Relational Data
Practice 2: Use SQLXML Bulk Load to Load XML Data
The UniversalLog administrator found another XML file that contains old data that must be uploaded into the database. The XML file must be loaded into memory by using the SQLXML Bulk Load COM component, so you need to write a .NET application to do this. The data should be inserted into the UniversalLog table. 1. The C:\8\Lesson 5\ForBulkLoad.xml file contains 500 log entries that you need to upload into the UniversalLog table. 2. Use Visual Studio 2005 to write a console application to load the file into memory. The console application must use the SQL Server Bulk Load component. Add the following code to execute the bulk load:
SQLXMLBULKLOADLib.SQLXMLBulkLoad4Class objBL = new SQLXMLBULKLOADLib.SQLXMLBulkLoad4Class(); objBL.ConnectionString = "Provider=sqloledb;Data Source=DEMOS;Initial Catalog= TK4318;User Id=sa;"; objBL.Execute("UniversalLogSchema.xsd", "ForBulkLoad.xml");
3. Use the provided C:\8\Lesson 5\ UniversalLogSchema.xsd annotated XSD schema to map the XML data to the relational database. 4. Run the application to upload the XML data into the database. 5. Validate the data load by running a SELECT COUNT statement in SSMS.
Practice 3: Shred XML Data by Using the nodes() Method
The UniversalLog administrator needs to build a reporting application to analyze the most common errors raised by applications logging into the UniversalLog table. You need to develop the queries that extract the information needed by the reporting application. 1. The first report must show four columns, with the application name in the first column and the logRecord data from all the logged messages divided into three columns: Error Messages, Post Messages, and Informational Messages.
SELECT ApplicationName, LogRecord.value('(/logRecord//error/ message)[1]','nvarchar(max)') As 'Error Messages', LogRecord.value('(/logRecord//post/ moreInformation)[1]','nvarchar(max)') As 'Post Messages', LogRecord.value('(/logRecord//information/ message)[1]','nvarchar(max)') As 'Informational Messages' FROM UniversalLog
2. Use the CROSS APPLY operator to show log records that contain all three types of messages.
8
Managing XML Data
SELECT ApplicationName, Errors.C.value('./message','nvarchar(max)') As 'Error Messages', Posts.C.value('./moreInformation','nvarchar(max)') As 'Post Messages', Info.C.value('./message','nvarchar(max)') As 'Informational Messages' FROM UniversalLog CROSS APPLY LogRecord.nodes('/logRecord//error') Errors(C) CROSS APPLY LogRecord.nodes('/logRecord//post') Posts(C) CROSS APPLY LogRecord.nodes('/logRecord//information') Info(C)
3. Use the OUTER APPLY operator to show all log records and to see the messages for each record.
SELECT ApplicationName, Errors.C.value('./message','nvarchar(max)') As 'Error Messages', Posts.C.value('./moreInformation','nvarchar(max)') As 'Post Messages', Info.C.value('./message','nvarchar(max)') As 'Informational Messages' FROM UniversalLog OUTER APPLY LogRecord.nodes('/logRecord//error') Errors(C) OUTER APPLY LogRecord.nodes('/logRecord//post') Posts(C) OUTER APPLY LogRecord.nodes('/logRecord//information') Info(C)
Lesson Summary
OPENXML supports implicit and explicit mapping. Always remember to call the sp_xml_removedocument after using OPENXML. OPENXML loads the whole XML structure into memory. The nodes() method of the XML data type returns a new row for each XML node that matches a given XQUERY expression. Use the value(), query(), and exist() methods available in the XML data type to extract data from each row. The APPLY operator enables you to invoke a function for each row returned from a query. The CROSS APPLY operator returns from the invoked function only those results that are not NULL. The OUTER APPLY operator returns all results, even if they are NULL.
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