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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:

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 server will display an error message in the Result pane (see Figure 7-8). The second and third parameters indicate the severity and state of the error.

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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<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>

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>

Figure 7-8

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

Open Data Services (ODS) functions as the client manager for SQL Server; it is basically an interface between server Net-Libraries and server-based applications, including SQL Server. ODS manages the

Figure 12-25.

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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:

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:

Naturally, this statement does more than return this meager result. It also sets the value of the @@error function to the number of the error that you have raised. If you do not specify an error number (as was the case in the previous example), SQL Server will assign the default of 50000. You can also display errors that are predefined in SQL Server if you reference them by their numbers, and you can define your own errors using the sp_addmessage system stored procedure:

<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">

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