SQL Server 2000 Stored Procedure & XML Programming in Visual Studio .NET

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SQL Server 2000 Stored Procedure & XML Programming
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<xsd:attribute name="OrgUnitId" type="xsd:short" /> <xsd:attribute name="UserName" type="xsd:string" /> <xsd:attribute name="ts" type="xsd:long" /> </xsd:complexType> <xsd:element name="Inventory" sql:relation="Inventory" type="Inventory_type" /> <xsd:complexType name="Inventory_type"> <xsd:attribute name="Inventoryid" type="xsd:int" /> <xsd:attribute name="EquipmentId" type="xsd:int" /> <xsd:attribute name="LocationId" type="xsd:int" /> <xsd:attribute name="StatusId" type="xsd:unsignedByte" /> <xsd:attribute name="LeaseId" type="xsd:int" /> <xsd:attribute name="LeaseScheduleId" type="xsd:int" /> <xsd:attribute name="OwnerId" type="xsd:int" /> <xsd:attribute name="Rent" type="xsd:decimal" /> <xsd:attribute name="Lease" type="xsd:decimal" /> <xsd:attribute name="Cost" type="xsd:decimal" /> <xsd:attribute name="AcquisitionTypeID" type="xsd:unsignedByte" /> </xsd:complexType> </xsd:schema>
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XML views have one significant advantage over relational views they are updateable. You can use UpdateGrams or XML Bulk Load to load XML documents into multiple tables.
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sql:is-constant="1" annotations are used on static nodes. This annotation is useful for defining the root node or other nodes that are not linked to table columns. In the following schema, the root node (EqList) is artificially added as a container for all other nodes:
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< xml version="1.0" encoding="UTF-8" standalone="no" > <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sql="urn:schemas-microsoft-com:mapping-schema"> <xsd:element name="EqList" sql:is-constant="1"> <xsd:complexType> <xsd:sequence> <xsd:element name="Eq" sql:relation="Equipment" maxOccurs="unbounded"> <xsd:complexType>
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14: Publishing Information Using SQLXML
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<xsd:attribute name="EqId" sql:field="EquipmentId" type="xsd:integer" /> <xsd:attribute name="Make" type="xsd:string" /> <xsd:attribute name="Model" type="xsd:string" /> </xsd:complexType> </xsd:element> </xsd:sequence> </xsd:complexType> </xsd:element> </xsd:schema>
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The sql:mapped attribute serves an opposite purpose. It is useful in cases in which you have a schema that contains a component that cannot be mapped to a database object. SQL Server will not return XML view components that are annotated with sql:mapped = "0":
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< xml version="1.0" encoding="UTF-8" standalone="no" > <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sql="urn:schemas-microsoft-com:mapping-schema"> <xsd:element name="EqList" sql:is-constant="1"> <xsd:complexType> <xsd:sequence> <xsd:element name="Eq" sql:relation="Equipment" maxOccurs="unbounded"> <xsd:complexType> <xsd:attribute name="EqId" sql:field="EquipmentId" type="xsd:integer" /> <xsd:attribute name="Make" type="xsd:string" /> <xsd:attribute name="Model" type="xsd:string" /> <xsd:attribute name="GTIN" type="xsd:string" sql:mapped = "0"/> </xsd:complexType> </xsd:element> </xsd:sequence> </xsd:complexType> </xsd:element> </xsd:schema>
The id, idref, and idrefs attributes can be used to create intradocument links in XML documents; sql:id-prefix annotations can be used to make ID
SQL Server 2000 Stored Procedure & XML Programming
attributes unique; sql:use-cdate annotations can be used to specify a CDATA section in the XML document; sql:overflow-field attributes are used to retrieve data from fields that contain XML tags; sql:limit-field and sql:limit-value annotations are used to filter result sets; sql:identity and sql:guid are used to control whether SQL Server uses values supplied by DiffGram and UpdateGram or generates new ones; and so on.
Programmatic Database Access
SQLXML contains two data providers that can manage SQL Server data using XML: SQLXML Managed Classes For creating .NET applications using the .NET Framework SQLXMLOLEDB Provider ADO and ADO.NET For creating database application using
Retrieving XML Data Using SQLXML Managed Classes
The SQLXML Managed Classes assembly contains three main classes: SqlXmlCommand SQL Server 2000 Used to specify a query and retrieve XML from
SqlXmlParameter Used to set parameters to SqlXmlCommand SqlXmlAdapter Used to retrieve a DataSet object based in a SqlXmlCommand query To use these classes in your .NET application, you must add to your project a reference to the Microsoft.Data.SqlXml namespace (implemented as the Microsoft.Data.SqlXml.dll assembly in the \Program Files\SQLXML 3.0\bin folder).
NOTE
Although these managed classes were initially delivered with SQLXML 2.0, you should install the newest version. Earlier versions were designed to work with the Beta 2 version of the .NET Framework, and you will resolve some compatibility issues when you install the latest version.
Figure 14-24 shows the architecture of a .NET application that uses SQLXML Managed Classes.
14: Publishing Information Using SQLXML
Figure 14-24
Retrieving data using SQLXML Managed Classes
Retrieving XML Data Using the SqlXmlCommand Class
You can use the SqlXmlCommand class to specify a SQL query (with the For XML clause), a template, or an XPath query (against the mapping schema) to retrieve an XML document (or fragment) from SQL Server 2000. The query itself has to be specified using the CommandText property of the SqlXmlCommand class. The type of query is specified using the CommandType property. Possible values are SqlXmlCommandType.SQL (default) SqlXmlCommandType.Template SqlXmlCommandType.TemplateFile SqlXmlCommandType.XPath SqlXmlCommandType.UpdateGram SqlXmlCommandType.DiffGram The next chapter discusses how you can use the SqlXmlCommand class with UpdateGrams and DiffGrams; this chapter focuses on the rest of the available properties. There are three methods for returning XML data using the SqlXmlCommand class: ExecuteToStream The resulting XML fragment is written to an existing Stream object (typically a file) ExecuteStream The result is returned as a new Stream object (typically console) ExecuteXmlReader Returns the result as an XmlTextReader instance (to be used in data-bound controls) Each of these options has its advantages and can be used in different circumstances.
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