This lesson covers how to use annotated XSD schemas and how to query them by using XML view files. in .NET

Print PDF417 in .NET This lesson covers how to use annotated XSD schemas and how to query them by using XML view files.

This lesson covers how to use annotated XSD schemas and how to query them by using XML view files.
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Using SQLXML to modify and bulk load data
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For information about how to use SQLXML to update data, see Lesson 4 in this chapter. For information about bulk loading XML data into the database using a mapping schema, see Lesson 5.
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After this lesson, you will be able to:
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Create annotated XSD schemas. Create XML views. Use SQLXML 4.0 to query XSD schemas and XML views.
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Estimated lesson time: 30 minutes
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Lesson 3: Retrieving XML Data by Using SQL Server Middle-Tier Technologies
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Using SQLXML-Annotated XSD Schemas
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Annotated XSD schemas declare a mapping between an XML schema and a relational schema so that SQLXML components can infer the relational operations to execute on the database based on the operations executed against the XML structure.
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NOTE
Different uses of the term schema The declaration of the physical structure of data is called a schema. Data in XML format is referred to as an XML schema. Data in a relational-tabular format is referred to as a relational schema. The SQLXML mapping mechanism is called an annotated XSD schema.
For the rest of this lesson, we will use the following terms to refer to different types of schemas:
You build annotated XSD schemas by enhancing regular XSD schemas with specific keywords. The annotated keywords are defined in the xmlns:sql="urn:schemasmicrosoft-com:mapping-schema" XML namespace and namespace prefix. Table 8-4 describes the most common keywords you use to annotate XSD schemas.
Table 8-4
Common Annotated Keywords
Keyword sql:relation sql:fields sql:key-fields
Description Maps XML element declarations to tables in the database. Maps XML content elements and attributes to columns in a table in the database. Declares the primary keys from a table in the database so that SQLXML can formulate Transact-SQL queries by using the correct keys to filter data. Declares the relationship between two tables and is used when the XML code has nested elements that are related to different tables. It is translated into a Transact-SQL join. Declares that the XML element should be copied as-is to the resulting structure. It does not map to any table or column in the database.
sql:relationship
sql:is-constant
8
Managing XML Data
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Mapping keywords
For information about all the mapping keywords available and how to use each of them, see the topic Using Annotations in XSD Schemas in SQL Server 2005 Books Online.
Here is an example of an annotated XML schema that returns all employees, grouped by their department, as in previous examples:
< xml version="1.0" > <xsd:schema id="EmployeeHiredDate" xmlns:sql="urn:schemas-microsoft-com:mapping-schema" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <xsd:element name="EmployeesByDepartment" sql:is-constant="true"> <xsd:complexType> <xsd:sequence minOccurs="0" maxOccurs="unbounded"> <xsd:element name="Department" sql:relation="HumanResources.Department" sql:key-fields="DepartmentID"> <xsd:complexType> <xsd:sequence minOccurs="0" maxOccurs="unbounded"> <xsd:element name="Employee" sql:relation="HumanResources.Employee" sql:key-fields="EmployeeID"> <xsd:annotation> <xsd:appinfo> <sql:relationship parent="HumanResources.Department" parent-key="DepartmentID" child="HumanResources.EmployeeDepartmentHistory" child-key="DepartmentID" /> <sql:relationship parent="HumanResources.EmployeeDepartmentHistory" parent-key="EmployeeID" child="HumanResources.Employee" child-key="EmployeeID" /> </xsd:appinfo> </xsd:annotation> <xsd:complexType> <xsd:sequence> <xsd:element name="Title"/> <xsd:element name="HireDate"/> </xsd:sequence> <xsd:attribute name="ID" sql:field="EmployeeID"/> <xsd:attribute name="LoginID"/> </xsd:complexType> </xsd:element> </xsd:sequence> <xsd:attribute name="ID" sql:field="DepartmentID"/> <xsd:attribute name="Name"/> </xsd:complexType> </xsd:element> </xsd:sequence> </xsd:complexType> </xsd:element> </xsd:schema>
Lesson 3: Retrieving XML Data by Using SQL Server Middle-Tier Technologies
The is-constant attribute is added to the EmployeesByDepartment root node because it does not map to any table in the database. Notice that the sql:relationship elements declare a many-to-many relationship between the HumanResources.Department table and the HumanResources.EmployeeDepartmentHistory table and then between the HumanResources.EmployeeDepartmentHistory table and the HumanResources.Employee table. An implicit mapping is applied when an element or attribute does not declare its source table or column. An explicit mapping is applied when the sql:relation or sql:field attributes are used, as you can see by looking at the ID attributes in the Employee element in the above example. A partial result of retrieving XML by using this annotated XML schema looks like this:
<EmployeesByDepartment> ... <Department ID="2" Name="Tool Design"> <Employee ID="4" LoginID="adventure-works\rob0"> <Title>Senior Tool Designer</Title> <HireDate>1998-01-05T00:00:00</HireDate> </Employee> <Employee ID="5" LoginID="adventure-works\thierry0"> <Title>Tool Designer</Title> <HireDate>1998-01-11T00:00:00</HireDate> </Employee> <Employee ID="263" LoginID="adventure-works\ovidiu0"> <Title>Senior Tool Designer</Title> <HireDate>2001-01-05T00:00:00</HireDate> </Employee> <Employee ID="265" LoginID="adventure-works\janice0"> <Title>Tool Designer</Title> <HireDate>2001-01-23T00:00:00</HireDate> </Employee> </Department> ... </EmployeesByDepartment>
A clear benefit of using SQLXML-annotated XML schemas is that developers can design the structure of the XML data to fit their own needs.
Using SQLXML XML Views
A SQLXML XML view is an XML file that declares optional input parameters, a query, and a resulting XML structure. The result of executing an XML view is an XML fragment.
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