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SQL Server 2000 Stored Procedure Programming
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The result of the annotated schema
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sql:field annotations can be applied to elements as well. The following schema is not attribute-based, but element-based:
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<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="eltOnly" model="closed" order="many"> <element type="PartNo" sql:field="EquipmentId"/> <element type="Manufacturer" sql:field="Make"/> <element type="Model"/> </ElementType> <ElementType name="PartNo" content="textOnly" model="closed" dt:type="i4"/>
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XML Support in SQL Server 2000
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<ElementType name="Manufacturer" content="textOnly" model="closed" dt:type="string"/> <ElementType name="Model" content="textOnly" model="closed" dt:type="string"/> </Schema>
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You can use this schema through the following template:
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<ROOT xmlns:sql="urn:schemas-microsoft-com:xml-sql"> <sql:xpath-query mapping-schema="PartElementSchema.xml"> Part </sql:xpath-query> </ROOT>
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The result is shown in Figure 12-24.
Figure 12-24.
An element-based XML document as a result of an annotated schema
SQL Server 2000 Stored Procedure Programming
Mapping Relationships So far, we have demonstrated only schemas based on a single table (or view). When the XML document has to map to more than one table, that relationship has to be annotated using the <sql:relationship> tag. This process is similar to the creation of foreign keys in relational databases. The following attributes of the <sql:relationship> tag need to be defined:
Attribute Description
key-relation key foreign-relation foreign-key
Name of the primary relation Node (field) in a primary relation (table) that serves as primary key Name of the foreign relation (table) Node (field) in a foreign relation (table) that serves as foreign key
The following schema contains such a relationship:
<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="Contact" content="eltOnly" model="closed" order="many"> <element type="Inventory" maxOccurs="*"> <sql:relationship key-relation="Contact" key="ContactId" foreign-key="OwnerId" foreign-relation="Inventory" /> </element> <AttributeType name="ContactId" dt:type="i4"/> <AttributeType name="FirstName" dt:type="string"/> <AttributeType name="LastName" dt:type="string"/> <AttributeType name="Phone" dt:type="string"/> <AttributeType name="Fax" dt:type="string"/>
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XML Support in SQL Server 2000
<AttributeType name="Email" dt:type="string"/> <AttributeType name="OrgUnitId" dt:type="i2"/> <AttributeType name="UserName" dt:type="string"/> <AttributeType name="ts" dt:type="i8"/> <attribute type="ContactId"/> <attribute type="FirstName"/> <attribute type="LastName"/> <attribute type="Phone"/> <attribute type="Fax"/> <attribute type="Email"/> <attribute type="OrgUnitId"/> <attribute type="UserName"/> <attribute type="ts"/> </ElementType> <ElementType name="Inventory" content="empty" model="closed"> <AttributeType name="Inventoryid" dt:type="i4"/> <AttributeType name="EquipmentId" dt:type="i4"/> <AttributeType name="LocationId" dt:type="i4"/> <AttributeType name="StatusId" dt:type="ui1"/> <AttributeType name="LeaseId" dt:type="i4"/> <AttributeType name="LeaseScheduleId" dt:type="i4"/> <AttributeType name="OwnerId" dt:type="i4"/> <AttributeType name="Rent" dt:type="fixed.14.4"/> <AttributeType name="Lease" dt:type="fixed.14.4"/> <AttributeType name="Cost" dt:type="fixed.14.4"/> <AttributeType name="AcquisitionTypeID" dt:type="ui1"/> <attribute type="Inventoryid"/> <attribute type="EquipmentId"/> <attribute type="LocationId"/> <attribute type="StatusId"/> <attribute type="LeaseId"/> <attribute type="LeaseScheduleId"/> <attribute type="OwnerId"/> <attribute type="Rent"/> <attribute type="Lease"/> <attribute type="Cost"/> <attribute type="AcquisitionTypeID"/> </ElementType> </Schema>
SQL Server 2000 Stored Procedure Programming
It can be used through the following template:
<ROOT xmlns:sql="urn:schemas-microsoft-com:xml-sql"> <sql:xpath-query mapping-schema="OwnerSchema.xml"> Contact </sql:xpath-query> </ROOT>
The result is shown in Figure 12-25. Naturally, you can join more than one table. Other Annotations There are other annotations that you can also use in mapping schemas: sql:is-constant= 1 annotations are used on static nodes such as the root node; id, idref, and idrefs attributes can be used to create intradocument links in XML
Figure 12-25.
Relationship as an annotation of an XDR schema
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XML Support in SQL Server 2000
documents; sql:id-prefix annotations can be used to make ID 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:map-field attributes are used to prevent nodes from being mapped in the schema; and so on. Retrieving Data Using XDR Schemas There are three ways to retrieve database information using XDR annotated schemas:
w s v
Templates that contain XPath queries Templates with inline mapping schemas A URL that refers to the mapping schema and specifies an XPath query
So far, all examples have used the first method a template that contains XPath queries. We will now explore the other two. Templates with Inline Mapping Schemas It is very simple to create this type of template. In the following example, we have merged template and schema files used earlier into one file:
<ROOT xmlns="urn:schemas-microsoft-com:xml-data" xmlns:dt="urn:schemas-microsoft-com:datatypes" xmlns:sql="urn:schemas-microsoft-com:xml-sql"> <Schema name="Schema" sql:id="InlineSchema" sql:is-mapping-schema="1"> <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> <sql:xpath-query mapping-schema="#InlineSchema">
SQL Server 2000 Stored Procedure Programming
Part </sql:xpath-query> </ROOT>
The schema is identified using the sql:id attribute and described using the sql:is-mapping-schema attribute of the <Schema> element. The identifier is used later in the mapping-schema attribute of the <sql:xpath-query> element. The template can be used with a simple URL reference to the file as shown in Figure 12-26. A URL with a Reference to a Mapping Schema and an XPath Query To refer to an XDR-annotated schema in a URL, you must first create a virtual name for the schema of the type described in Configuring Database Access Through HTTP earlier in this chapter. Such a URL has the following structure:
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