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DAT 405 Extreme SqlXml Irwin Dolobowsky Program Manager – SqlXml Microsoft Corporation Agenda Where We’ve Been and Where We Are Xml Views – The Core of SqlXml Demo – XPath over Annotated Schema Scenario – Data Exchange Demo XPath over Annotated Schema Xml Bulkload Scenario – Decoupled Business Objects Demo XPath over Annotated Schema Templates Updategrams Other Scenarios Discussion Where We’ve Been Started in 1998 to allow storage and retrieval of XML data to and from SQL Server Version 1.0 of product shipped as part of SQL Server 2000 FOR XML and OpenXML in the Server Templates, ISAPI, Annotated XDR for the Client ADO/OLEDB Provider New “Web Releases” of client functionality are available via the MSDN web site: http://www.msdn.com/sqlxml Three fully supported releases since the initial SQL Server 2000 release Where We Are Since Sql Server 2000 Updategrams Bulkload Annotated XSD (instead of XDR) SqlXml Managed Classes Client-Side FOR XML Web Services Support Current release – SqlXml 3.0 SP2 ID Propagation Support for Bulkload NULL Support for Web Services SqlXml - Architecture SQL Server XSLT XPath Queries Relation tables Updategrams XML Bulkload Annotated XSD Mapping Schemas For XML Queries Relation views Relatio Stored n procs Xml Views Virtual Xml Document over a SQL Server database Uses XSD schemas with special annotations Annotations specify the mapping between xml and relational data Query View using XPath subset FOR XML EXPLICIT queries generated Update through view with Updategrams and Bulkload Simple Mapping <xsd:schema xmlns:xsd=“http://www.w3.org/2001/XMLSchema” xmlns:sql="urn:schemas-microsoft-com:mapping-schema“> <xsd:element name=“Customers” sql:relation=“tblCustomers” > <xsd:complexType> <xsd:attribute name=“ID” sql:field=“pkCustID” /> </xsd:complexType> Relational Data: </xsd:element > tblCustomers Table </xsd:schema> <Customers ID=“A”/> <Customers/> <Customers ID=“B”/> pkCustID -----A NULL B Mapping With Hierarchy <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sql="urn:schemas-microsoft-com:mapping-schema"> <xsd:annotation> <xsd:appinfo> <sql:relationship name="CustOrders" parent="Customers" parent-key="CustomerID" child="Orders" child-key="CustomerID" /> </xsd:appinfo> </xsd:annotation> <xsd:element name="Customer" sql:relation="Customers" > <xsd:complexType> <xsd:sequence> <xsd:element name=“name” sql:field="companyName" /> <xsd:element name="Order" sql:relation="Orders" sql:relationship="CustOrders"> <xsd:complexType> <xsd:attribute name=“oid" sql:field="OrderID” /> </xsd:complexType> </xsd:element> </xsd:sequence> <xsd:attribute name="cid" sql:field="CustomerID" /> </xsd:complexType> </xsd:element> </xsd:schema> Storing Open Content <xsd:schema xmlns:xsd=“http://www.w3.org/2001/XMLSchema” xmlns:sql=“urn:schemas-microsoft-com:mapping-schema”> <xsd:element name=“Customers” sql:relation=“tblCustomers” sql:overflow-field=“Notes”> <xsd:complexType> <xsd:attribute name=“ID” sql:field=“pkCustID” /> </xsd:complexType> </xsd:element > </xsd:schema> <Customers ID=“A”/> <Customers ID=“B”/> <Customers ID=“C” x=“4”> <Name>Bob</Name> </Customers> pkCustID Notes A NULL B NULL <Customers C x=“4”> <Name>Bob</Name> </Customers> Querying Xml Views Irwin Dolobowsky Program Manager SqlXml Other Annotations Sql:is-constant Create an unmapped constant element (wrapper) Sql:hide Query element/attribute with out surfacing Sql:mapped Element/attribute is not there Advantages Of The Xml View Easier to develop and maintain than For XML Explicit queries Multiple databases (with different schemas) can provide a common XML view Update back through View Decouple Shaping from Query SqlXml Application Scenario Data Exchange Problem Need to Exchange Data between Companies Databases schemas are different Neither company can change database SqlXml Application Scenario Abstracting the Data Source Solution – SqlXml! Agree on schema for data to exchange Produce XML from Server 1 Map database to the schema Query mapping with XPath Persist changes to Server 2 Same schema, different mapping Use Bulkload to load the data Works in reverse too Data Exchange Xml Bulkload Irwin Dolobowsky Program Manager SqlXml Xml Bulkload Bulkload XML documents into a SQL Server database via the XML View Supports hierarchical relationships and semi-structured data Performance is about 75% of traditional bulkload New in SP2! – Identity Propagation Values generated in Parent pushed to child before inserting SqlXml Application Scenario Decoupled Business Objects Problem Mid tier performs business logic over objects Generating objects can be a hassle Objects are hierarchical, not relational Database limitations Database schema is set Want to batch updates to the database SqlXml Application Scenario Decoupled Business Objects Solution – SqlXml! Use XML Serialization Produce XML from the database with XPath and Annotated Schema Use XML Serialization to produce objects from XML Persist changes to SQL Server Keep original XML Image Serialize Objects back to XML when done Produce an Updategram with the difference, send to database Use Overflow to store unconsumed data Decoupled Business Objects Object Serialization with SqlXml Irwin Dolobowsky Program Manager SqlXml Xml Templates Xml Document with embedded queries FOR XML T-SQL queries XPath over Annotated Schema Client-Side FOR XML Execute Non-FOR XML Stored Procs Raw, Nested (Auto*), Explicit Modes Parameterized for re-usability Post Process with XSLT Updategrams Modify the database through XML View Easily represent hierarchical changes Declare before and after images of the XML Optimistic concurrency control Each updategrams generates one or more INSERT, UPDATE, and DELETE statements Each sync block carried out as a single transaction Other SqlXml Scenarios Data Driven Website XPath and Xml Views to retrieve data XmlTemplates/XSLT to generate pages through ISAPI Data Storage Abstraction App works on top of XML Data Underlying storage doesn’t matter Save as files offline, to database online More Information SqlXml on MSDN http://msdn.microsoft.com/sqlxml http://msdn.microsoft.com/xml Newsgroups microsoft.public.sqlserver.xml microsoft.public.dotnet.xml My Blog http://blogs.msdn.com/irwando Community http://www.SqlXml.org Attend a free chat or web cast http://www.microsoft.com/communities/chats/default.mspx http://www.microsoft.com/usa/webcasts/default.asp List of newsgroups http://communities2.microsoft.com/ communities/newsgroups/en-us/default.aspx MIcrosoft Community Sites http://www.microsoft.com/communities/default.mspx Locate Local User Groups http://www.microsoft.com/communities/usergroups/default.mspx Community sites http://www.microsoft.com/communities/related/default.mspx Please fill out a session evaluation on CommNet Q1: Overall satisfaction with the session Q2: Usefulness of the information Q3: Presenter’s knowledge of the subject Q4: Presenter’s presentation skills Q5: Effectiveness of the presentation © 2004 Microsoft Corporation. All rights reserved. This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.
