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HTML file rather than an XML file. You must specify an additional parameter (contenttype=text/html) when you specify the URL:

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,

Be very cautious when you use cursors: test the status after each fetch; place error handling after each command; do not forget to close and deallocate the cursor when you do not need it any more. There are many rules and regulations for using cursors, and some of them might seem trivial, but even the smallest mistake can halt the execution of your code.

12:

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"/> ...

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established. Note that Windows NT/2000 Authentication is not available when SQL Server is running on Windows 95 or Windows 98. When you connect to SQL Server running on Windows 95 or Windows 98, you must specify a SQL Server logon ID and password.

Figure 12-20.

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>

The overconfidence that comes with routine may be your worst enemy. If you perform the same or similar tasks over and over again, you can lose focus and skip basic steps. Do not put code into production before it is thoroughly tested; do not place bug fixes directly into production; use error handling even if the code seems straightforward and the chance for error slight.

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:

12:

Figure 12-21.

A developer s effective use of error handling procedures is often an excellent indicator of his or her experience in that particular programming language. Those of

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.

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.

If RPCs had been available years ago, Net-Library might never have been invented. When SQL Server ran only on OS/2, it supported only Named Pipes. The developers wanted to broaden this support to SPX and TCP/IP and potentially other protocols, so they developed Net-Library as an abstraction layer. Now RPC services are available with so many network protocols that RPC alone might have met the need.

Figure 12-22.

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