<root xmlns:updg="urn:schemas-microsoft-com:xml-updategram" /> in VS .NET

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<root xmlns:updg="urn:schemas-microsoft-com:xml-updategram" />
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15: Modifying Databases Using SQLXML
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Element-centric vs. Attribute-centric UpdateGram
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So far, we have been using attribute-centric UpdateGrams to demonstrate its features in other words, columns have been mapped using XML attributes. If it is more convenient, you can use element-centric UpdateGrams instead:
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<root xmlns:updg="urn:schemas-microsoft-com:xml-updategram"> <updg:sync> <updg:before> <Contact> <ContactId> 1 </ContactId> </Contact> </updg:before> <updg:after> <Contact> <ContactId> 1 </ContactId> <Phone> (416) 123-1234 </Phone> </Contact> </updg:after> </updg:sync> </root>
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UpdateGrams with Parameters
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There is not much sense in posting a static UpdateGram to SQL Server. UpdateGrams really become useful only when you use parameters. The parameters must be declared using the updg:param element, after which they can be used in before and after elements:
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<ROOT xmlns:updg="urn:schemas-microsoft-com:xml-updategram"> <updg:header> <updg:param name="ContactId"/> <updg:param name="Phone" /> </updg:header> <updg:sync> <updg:before>
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SQL Server 2000 Stored Procedure & XML Programming
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<Contact ContactId = "$ContactId"/> </updg:before> <updg:after> <Contact ContactId = "$ContactId" Phone = "$Phone"/> </updg:after> </updg:sync> </ROOT>
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If the preceding UpdateGram is saved as UpdateGramPhone.xml in the template folder, it can be executed using the following URL:
http://localhost/asset/template/UpdateGramPhone.xml ContactId=1& Phone=416-123-1217
Alternatively, you can execute it programmatically:
'SqlXml_UpdategramParam Imports System Imports System.IO Imports Microsoft.Data.SqlXml 'The SQLXML namespace Module Module1 Sub Main() 'Instantiate the SqlXmlCommand object and the connection Dim objSqlXmlCmd As New SqlXmlCommand("Provider=SQLOLEDB;" _ & "Server=(local)\SS2K;Database=Asset;" _ & "Integrated Security=SSPI") 'Set type of query objSqlXmlCmd.CommandType = SqlXmlCommandType.UpdateGram 'Set the parameterized query objSqlXmlCmd.CommandText = "<ROOT " _ + " xmlns:updg=""urn:schemas-microsoft-com:xml-updategram"" > " _ + "<updg:header>" _ + " <updg:param name=""ContactId""/>" _ + " <updg:param name=""Phone"" />" _ + "</updg:header>" _ + " <updg:sync>" _ + " <updg:before>" _ + " <Contact ContactId = ""$ContactId""/>" _ + " </updg:before>" _ + " <updg:after>" _ + " <Contact ContactId = ""$ContactId"" Phone = ""$Phone""/>"_ + " </updg:after>" _
15: Modifying Databases Using SQLXML
+ " </updg:sync>" _ + "</ROOT>" 'define parameters Dim objParam1 As SqlXmlParameter Dim objParam2 As SqlXmlParameter 'instantiate parameter objParam1 = objSqlXmlCmd.CreateParameter() objParam1.Name = "ContactId" objParam2 = objSqlXmlCmd.CreateParameter() objParam2.Name = "Phone" 'prompt for the value Console.Write("Contact1 Id: ") objParam1.Value = Console.ReadLine() Console.Write("Phone: ") objParam2.Value = Console.ReadLine() 'Execute the query and retrieve result as a stream Dim objResult As MemoryStream = objSqlXmlCmd.ExecuteStream() 'Write result to the console Dim objStreamReader As New StreamReader(objResult) Console.Write(objStreamReader.ReadToEnd) End Sub End Module
In this case, as confirmation that the update has been successful, the program displays
<root xmlns:updg="urn:schemas-microsoft-com:xml-updategram" />
Setting Parameters to Null
SQL Server designers have developed a special method for setting the values of UpdateGram parameters to null: the UpdateGram template must contain the nullvalue attribute of the updg:header element, which must be set to the string that will be used in the URL as an alias for null:
<ROOT xmlns:updg="urn:schemas-microsoft-com:xml-updategram"> <updg:header nullvalue="isnull"> <updg:param name="ContactId"/> <updg:param name="Phone" /> </updg:header>
SQL Server 2000 Stored Procedure & XML Programming
<updg:sync> <updg:before> <Contact ContactId = "$ContactId"/> </updg:before> <updg:after> <Contact ContactId = "$ContactId" Phone = "$Phone"/> </updg:after> </updg:sync> </ROOT>
If you save the UpdateGram as UpdateGramPhone.xml in the template folder, you will be able to set the value of a parameter to null using a URL like the following:
http://localhost/asset/template/UpdateGramPhone.xml ContactId=1&Phone=isnull
Returning Identifier Values
One of the basic operations that developers need to be able to do is to insert a record with a unique identifier into the database. Earlier chapters reviewed Transact-SQL methods for returning an identity value to the caller and for inserting a global unique identifier. All of those examples were based on the use of stored procedures. Unfortunately, UpdateGrams cannot access stored procedures. However, SQL Server s designers did not forget this requirement.
Identity Values
Two attributes are used to process identity values updg:at-identity and updg:returnid. The updg:at-identity attribute is used to name and capture the value that will be inserted in the Identity column. The captured value can be used in other places in the UpdateGram or be returned to the caller using the updg:returnid attribute. You just have to be very careful not to use a name that you might later try to insert as a field value. In the following example, the identity value obtained from the Order record is first named "x" and then passed to the Foreign Key column OrderId in the OrderItem record:
<ROOT xmlns:updg="urn:schemas-microsoft-com:xml-updategram"> <updg:sync> <updg:before> </updg:before> <updg:after updg:returnid="x">
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