Using SQLXML BulkLoad in .NET

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Using SQLXML BulkLoad
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BulkLoad component is able to process large XML documents because it does not need to load the complete document into memory. It reads documents element by element and processes each element individually. Although SQLXML BulkLoad component is significantly faster then UpdateGrams, DiffGrams, and OpenXML(), it is not as fast as the Transact-SQL Bulk Insert statement and the Bulk Insert task in DTS. The reason is the amount of overhead associated with XML parsing.
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What should you do when someone sends you a large XML document to load to the database The most important task, and the most difficult, is to create an XSD schema to map the XML components of the document to database tables and columns. If you can extract a chunk that is smaller than 1MB, you could use Microsoft XSD Inference 1.0 at http://apps.gotdotnet.com/xmltools/xsdinference/ to infer (generate) the XSD schema automatically for you. If you cannot extract a chunk smaller than 1MB, you could download the command-line utility from the same site and try to perform the operation locally on your computer.
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15: Modifying Databases Using SQLXML
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If your document is simply too large, you might start from the target table(s). XSD Schema Designer in Visual Studio .NET can create a schema for you if you drag and drop a table into it. After the initial version of the XSD schema has been created, you will probably need to improve it. If the names of the XML elements and attributes do not match those of the tables and columns, you will have to use sql:relation and sql: field annotations to map them. If the XML document contains multiple tables, you will need to use the sql:relationship annotation to establish the relationships between parent and child elements. Another source of problems is the nullability of columns. You might need to remove use="required" from the schema for columns that do not require data. You should add a sql:overflow-field annotation to point to a large field (typically of the text data type) that will collect all the data not mapped to specific columns. You might need it later. More importantly, this is a safety net in case your partner organization decides to change the structure of the XML document they send you. You will also need to investigate whether data types are compatible. The size of some types, such as numbers and strings, can be an issue. Microsoft also recommends that you explicitly map xsd:dateTime and xsd:time types to datetime or smalldatetime, and xsd:GUID to uniqueidentifier so that the bulk load process performs the necessary conversions.
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< xml version="1.0" encoding="utf-8" > <xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:sql="urn:schemas-microsoft-com:mapping-schema"> <xs:element name="Inventory" sql:relation="InventoryBulkLoad" sql:overflow-field ="Note" > <xs:complexType> <xs:attribute name="Inventoryid" type= "xs:unsignedByte" sql:datatype ="int" use="required" /> <xs:attribute name="EquipmentId" type="xs:unsignedByte" sql:datatype ="int" use="required" /> <xs:attribute name="LocationId" type="xs:unsignedByte" sql:datatype ="int" use="required" /> <xs:attribute name="StatusId" type="xs:unsignedByte" sql:datatype ="tinyint" use="required" /> <xs:attribute name="LeaseId" type="xs:unsignedByte"
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sql:datatype ="int" /> <xs:attribute name="LeaseScheduleId" type="xs:unsignedByte" sql:datatype ="int" /> <xs:attribute name="OwnerId" type="xs:unsignedByte" sql:datatype ="int" use="required" /> <xs:attribute name="Cost" type="xs:unsignedShort" sql:datatype ="money" /> <xs:attribute name="AcquisitionTypeID" type="xs:unsignedByte" sql:datatype ="tinyint" use="required" /> </xs:complexType> </xs:element> </xs:schema>
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When you are done with the schema, running the load is easy. If there are no errors, you will end up with a table like the one shown in Figure 15-5.
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Figure 15-5
Overflow field
15: Modifying Databases Using SQLXML
XML Web Services
Simple Object Access Protocol (SOAP) is a platform-independent, XML-based protocol for cross-system component communication. There are other protocols for carrying out such communication (for example, COM/DCOM, CORBA, .NET Remoting, and Internet Inter-ORB Protocol), but they are typically tied to a single component technology. SOAP, on the other hand, is intended to be truly platform independent. To this end, a working group was formed under the W3C to define a protocol for the exchange of structured, typed information between peers in a distributed, decentralized environment using XML. The result of its work is the SOAP protocol for implementing web services. In SQLXML 3.0, Service Pack 1, and in the .NET Framework, Microsoft implements SOAP version 1.1. W3C s XML Protocol Working Group has already defined SOAP version 1.2, and soon new versions of Microsoft tools will add support for it. Before I describe the details of SOAP implementation within SQL Server, I ll review the web services architecture.
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