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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,

us who deal with a C or Visual Basic environment are accustomed to a whole set of feature-rich error handling objects, procedures, and functions. Compared with those, T-SQL seems rather inadequate. You can employ only one function and a few procedures for setting or raising errors. However, the apparent limitations of the tool set still do not justify sloppy solutions. This section starts by investigating how errors can be returned to a caller. Then, it discusses the concept of error handling and offers a comprehensive methodology for implementation. It also discusses some alternative techniques involving the Set Xact_Abort On statement.

12:

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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>

An important tool for implementing error handling is the Raiserror statement. Its main purpose is to return a user-defined or system-defined message to the caller. Open Query Analyzer and execute the following statement:

The result is shown in Figure 12-23.

Figure 12-23.

sql:field annotations can be applied to elements as well. The following schema is not attribute-based, but element-based:

<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"/>

12:

<ElementType name="Manufacturer" content="textOnly" model="closed" dt:type="string"/> <ElementType name="Model" content="textOnly" model="closed" dt:type="string"/> </Schema>

Strictly speaking, the TCP/IP Sockets Net-Library is the fastest Net-Library. In a pure network test that does nothing except throw packets back and forth between Net-Library pairs, it is perhaps 30 percent faster than the slowest Net-Library. But for local area network (LAN) environments and applications, the speed of the Net-Library probably makes little difference, because the network interface is generally not a limiting factor in a well-designed application. On a LAN, however, turning on encryption with the Multiprotocol Net-Library will cause a performance hit it is the slowest Net-Library option when encryption is turned on. But again, most applications probably would not notice the difference. Your best bet is to choose the Net-Library that matches your network protocols and provides the services you need in terms of unified logon, encryption, and dynamic name resolution.

Raiserror ('Error occurred!', 0, 1)

You can use this schema through the following template:

<ROOT xmlns:sql="urn:schemas-microsoft-com:xml-sql"> <sql:xpath-query mapping-schema="PartElementSchema.xml"> Part </sql:xpath-query> </ROOT>

The result is shown in Figure 12-24.

Figure 12-24.

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