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Special updategram keywords for Insert, Update, and Delete
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Special keywords enable you to execute different tasks such as handling null values, handling automatic values such as Identity columns or globally unique identifier (GUID) columns, and matching a specific before version of the data with an after version of the data when multiple before and after nodes are provided inside the same sync section. Read the following sections in SQL Server 2005 Books Online for more information about the special keywords that you can specify in the XML structure:
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Inserting Data Using XML Updategrams Updating Data Using XML Updategrams Deleting Data Using XML Updategrams
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Lesson 4: Modifying XML Data
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Let s take the same example we used for the modify() method of the XML data type and adjust it to use updategrams. First, let s create an annotated XSD schema called Department.xsd for the HumanResources.Departments table in the AdventureWorks database:
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< xml version="1.0" > <xs:schema id="Department" xmlns:sql="urn:schemas-microsoft-com:mapping-schema" xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:element name="NewDepartment" sql:relation="HumanResources.Department"> <xs:complexType> <xs:sequence> <xs:element name="ID" sql:field="DepartmentID" /> <xs:element name="Name" /> <xs:element name="GroupName" /> </xs:sequence> </xs:complexType> </xs:element> </xs:schema>
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Now we can create an updategram to insert a new department, saved in a file called DepartmentUpdg.xml:
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<ROOT xmlns:updg="urn:schemas-microsoft-com:xml-updategram"> <updg:header> <updg:param name="DepartmentName"></updg:param> </updg:header> <updg:sync mapping-schema="Department.xsd"> <updg:before> </updg:before> <updg:after> <NewDepartment> <Name>@DepartmentName</Name> <GroupName>Quality Assurance</GroupName> </NewDepartment> </updg:after> </updg:sync> </ROOT>
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And last, let s create a .NET application to execute the updategram. Remember to add a reference to Microsoft.Data.dll:
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SqlXmlCommand cmd = new SqlXmlCommand("connection_string"); cmd.CommandStream = new FileStream("DepartmentUpdg.xml", FileMode.Open, FileAccess.Read); cmd.CommandType = SqlXmlCommandType.DiffGram; SqlXmlParameter p = cmd.CreateParameter(); p.Name = "@DepartmentName"; p.Value = "Customer Assistance"; cmd.ExecuteNonQuery();
8
Managing XML Data
When you execute this code, it generates the following dynamic Transact-SQL code to be executed by SQL Server 2005:
exec sp_executesql N' SET XACT_ABORT ON BEGIN TRAN DECLARE @eip INT, @r__ int, @e__ int SET @eip = 0 INSERT HumanResources.Department (Name, GroupName) VALUES (N''@DepartmentName'', N''Quality Assurance''); SELECT @e__ = @@ERROR, @r__ = @@ROWCOUNT IF (@e__ != 0 OR @r__ != 1) SET @eip = 1 IF (@eip != 0) ROLLBACK ELSE COMMIT SET XACT_ABORT OFF ',N'@DepartmentName nvarchar(19)',N'Customer Assistance'
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Be careful when handling database concurrency issues
If one user alters the data in the database right before another user, it could be that both the before and after sections of data are out of date. Updategrams take an optimistic concurrency approach to handling concurrent updates to data in the database. This topic is beyond the scope of this chapter, but to learn how to handle database concurrency issues in updategrams, see the topic Handling Database Concurrency Issues in Updategrams in SQL Server 2005 Books Online.
PRACTICE
Modifying XML Data
This practice is constructed over the results of the previous practices in Lessons 2 and 3. If you have not completed these practices, please go back and follow the instructions to complete them. In this practice, you modify the XML data inside the UniversalLog table by using XML DML. Then you create an updategram to insert new records into the UniversalLog table.
NOTE
Code available on the companion CD
The Practice Files\8\Lesson 4\CompleteLesson4.sql file provides the solution for the exercises in Practice 1 in this lesson.
Practice 1: Modify XML Data by Using XML DML
In this exercise, you create the Transact-SQL statements to modify the contents of the UniversalLog table. If you completed the practices from previous lessons, the UniversalLog table contains five rows. 1. The first row is from the SalesApp application. The LogRecord column contains the following XML fragment:
<logRecord machine="server1" timestamp="2000-01-12T12:13:14Z"> <post eventType="appStart">
Lesson 4: Modifying XML Data
<moreInformation>All Services starting</moreInformation> </post> </logRecord>
2. Issue an UPDATE statement by using the modify() method of the XML data type to modify this XML into a fragment that looks like this:
<logRecord machine="server1" timestamp="2000-01-12T12:13:14Z"> <post eventType="appStart"> <moreInformation>All Services starting</moreInformation> </post> <information flag="custom"> <message>SQL Server service is starting</message> </information> </logRecord>
3. The fifth row is from the HoursReport application. Update the XML data contained in the LogRecord column. Change the information message in the logRecord/information/message XML element to be Not enough memory. 4. The fourth row is from the CustomerService application. Update the XML data contained in the LogRecord column. Delete the logRecord/post XML element. 5. Execute a SELECT statement to read all data from the UniversalLog table and verify that the changes were applied.
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