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Unfortunately, Internet Explorer displays HTML code as shown in Figure 12-19. To see how everything works together, you must prompt Internet Explorer to treat the content received from the Web server as an
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SQL Server 2000 Stored Procedure Programming
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HTML code obtained using an XML template with XSL
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You can see the result in Figure 12-20. Using XPath The <sql:XPath-query> element of the template is used to specify XPath query expressions and mapping schema against which the XPath query expression is executed. We will not describe mapping schemas until the next section, so we will demonstrate XPath queries in this section on the simplest possible schema. If you execute a simple Select statement with a For XML clause that contains an XMLData option against the Equipment table,
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XML Support in SQL Server 2000
you get a simple inline XDR schema at the beginning of the XML document:
<Schema name="Schema" xmlns="urn:schemas-microsoft-com:xml-data" xmlns:dt="urn:schemas-microsoft-com:datatypes"> <ElementType name="Equipment" content="empty" model="closed"> <AttributeType name="EquipmentId" dt:type="i4"/> <AttributeType name="Make" dt:type="string"/> <AttributeType name="Model" dt:type="string"/> <attribute type="EquipmentId"/> <attribute type="Make"/> <attribute type="Model"/> </ElementType> </Schema> <Equipment xmlns="x-schema:#Schema" EquipmentId="1" Make="Toshiba" Model="Portege 7020CT"/> ...
Figure 12-20.
The XML template with XSL converts result to an HTML page
SQL Server 2000 Stored Procedure Programming
To get a proper mapping schema in this case, you need to extract the schema into a separate file and to add another namespace to it (xmlns:sql= urn:schemas-microsoft-com:xml-sql ):
<Schema name="Schema" xmlns="urn:schemas-microsoft-com:xml-data" xmlns:dt="urn:schemas-microsoft-com:datatypes" xmlns:sql="urn:schemas-microsoft-com:xml-sql"> <ElementType name="Equipment" content="empty" model="closed"> <AttributeType name="EquipmentId" dt:type="i4"/> <AttributeType name="Make" dt:type="string"/> <AttributeType name="Model" dt:type="string"/> <attribute type="EquipmentId"/> <attribute type="Make"/> <attribute type="Model"/> </ElementType> </Schema>
NOTE: This is not the only operation needed to create a mapping schema. It is successful in this case only because the target XML document is so simple. We will explore the details of mapping a schema in the following section.
Now it is possible to create a template file to use the XPath query to get information using this schema:
<ROOT xmlns:sql="urn:schemas-microsoft-com:xml-sql"> <sql:xpath-query mapping-schema="EqSchema.xml"> Equipment </sql:xpath-query> </ROOT>
The schema is referenced in a mapping-schema attribute, and the XPath query is specified as the content of the <sql:xpath> element. The XPath query in the template references only Equipment nodes. If the template and the schema are stored in EqTemplate.xml and EqSchema.xml in the template virtual directory, they can be executed using:
http://c400/asset/template/EqTemplate.xml
Figure 12-21 shows the result.
12:
XML Support in SQL Server 2000
Figure 12-21.
Using an XPath query in a template file
We can use more complicated XPath queries in a template:
<ROOT xmlns:sql="urn:schemas-microsoft-com:xml-sql"> <sql:xpath-query mapping-schema="EqSchema.xml"> Equipment[@EquipmentId=1] </sql:xpath-query> </ROOT>
This query filters Element nodes that have an EquipmentId attribute with a value set to 1. Figure 12-22 shows the result.
XML Views Based on Annotations of XDR Schemas
In the preceding section, we demonstrated how XDR schemas and XPath queries can be used to retrieve data from a database. We will now examine the use of XDR schemas for mapping in greater detail.
SQL Server 2000 Stored Procedure Programming
Figure 12-22.
Using an XPath query to filter result
The main purpose of an XDR schema is to define the structure of the XML document. SQL Server 2000 extends the XDR schema language with annotations designed to map XML nodes (elements and attributes) and database objects (tables, views, and columns). Other annotations allow features such as the definition of hierarchical relationships between XML nodes, change of a target namespace, and the retrieval of XML-encoded data from a database. Such XDR schemas produce XML documents that behave in a fashion similar to database views and, therefore, are sometimes called XML views. Mapping Tables, Views, and Columns The schema used in the preceding section was based on default mapping between tables and elements,
12:
XML Support in SQL Server 2000
and between columns and attributes. Since SQL Server was able to find a table that corresponded to the specified element and attributes that corresponded to the table s columns, the result was an XML document containing information from the database table. In the case where an element is named differently than a table (or a view), you must add a sql:relation annotation (an attribute of the <ElementType> tag) to the schema. In the case where attributes of the element are named differently from the columns of the table (or the view), you must add a sql:field annotation (an attribute of the <attribute> tag) to the schema. In the following example, the Equipment table is mapped to the element <Part> and columns EquipmentId and Make are mapped to attributes PartNum and Manufacturer:
<Schema name="Schema" xmlns="urn:schemas-microsoft-com:xml-data" xmlns:dt="urn:schemas-microsoft-com:datatypes" xmlns:sql="urn:schemas-microsoft-com:xml-sql"> <ElementType name="Part" sql:relation="Equipment" content="empty" model="closed"> <AttributeType name="PartNum" dt:type="i4" /> <AttributeType name="Manufacturer" dt:type="string" /> <AttributeType name="Model" dt:type="string"/> <attribute type="PartNum" sql:field="EquipmentId"/> <attribute type="Manufacturer" sql:field="Make"/> <attribute type="Model"/> </ElementType> </Schema>
This schema can be used by the following template:
<ROOT xmlns:sql="urn:schemas-microsoft-com:xml-sql"> <sql:xpath-query mapping-schema="PartSchema.xml"> Part </sql:xpath-query> </ROOT>
The result is shown in Figure 12-23.
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