<ROOT xmlns:sql="urn:schemas-microsoft-com:xml-sql"> <sql:xpath-query mapping-schema="EqSchema.xml"> in .NET

Make DataMatrix in .NET <ROOT xmlns:sql="urn:schemas-microsoft-com:xml-sql"> <sql:xpath-query mapping-schema="EqSchema.xml">

<ROOT xmlns:sql="urn:schemas-microsoft-com:xml-sql"> <sql:xpath-query mapping-schema="EqSchema.xml">
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SQL Server 2000 Stored Procedure & XML Programming
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Equipment </sql:xpath-query> </ROOT>
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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 the Equipment node. If the template and the schema are saved as EqTemplate.xml and EqSchema.xml, respectively, in the template virtual directory, they can be executed using
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http://localhost/asset/template/EqTemplate.xml
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Figure 14-14 shows the result. We can use more complicated XPath queries in a template:
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<ROOT xmlns:sql="urn:schemas-microsoft-com:xml-sql"> <sql:xpath-query mapping-schema="EqSchema.xml"> Equipment[@EquipmentId=1] </sql:xpath-query> </ROOT>
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Figure 14-14
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Using an XPath query in a template file
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14: Publishing Information Using SQLXML
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This query filters Element nodes that have an EquipmentId attribute with a value set to 1. Figure 14-15 shows the result.
POSTing Queries to the Server
In preceding sections, I demonstrated how you can access database information over HTTP using the GET method. This method is easier to use for testing purposes you supply parameters in the URL after the sign in the form of an ampersandseparated list. Unfortunately, this database access method has two problems: You cannot expect even the most skilled users to be able to type proper queries in the form of a URL address. The size of the URL is limited to 2K, thus limiting the number of parameters and complexity of the query. HTTP s POST method does not set limitations on the size of a query, but it is even more difficult to use. You need a custom application (or component) to pass parameters to the web server.
Figure 14-15
Using an XPath query to filter results
SQL Server 2000 Stored Procedure & XML Programming
NOTE
Before you can start using the POST method, you must set the virtual directory to allow POST queries.
The simplest version of such an application is an HTML form that uses the POST method to pass the content of its controls to the server. In this case, instead of passing the query to an ASP page or some other component on the server, you need to pass the query to the virtual directory that processes XML requests. This technique can be demonstrated using the following stored procedure with two parameters:
CREATE PROCEDURE prListEquipment3_xml @Make varchar(50), @Model varchar(50) AS select EquipmentId, Make, Model, EqType from Equipment inner join EqType on Equipment.EqTypeId = EqType.EqTypeId where Make like @Make and Model like @Model for xml auto GO
Next, I create a web page with an HTML form. The form contains two visible controls that allow a user to specify the parameters of the query. There are also two hidden controls that specify an XML template to be passed to the server and the content type in which the result is expected:
<head> <TITLE>Query Equipment</TITLE> </head> <body> <H3>Query Equipment (use % as wild card).</H3> <form action="http://localhost/Asset" method="POST"> Make: <input type=text name=Make value='Tosh%'><BR> Model: <input type=text name=Model value='Por%'> <input type=hidden name=contenttype value=text/xml> <input type=hidden name=template value=' <ROOT xmlns:sql="urn:schemas-microsoft-com:xml-sql" > <sql:header>
14: Publishing Information Using SQLXML
<sql:param name="Make">%</sql:param> <sql:param name="Model">%</sql:param> </sql:header> <sql:query> exec prListEquipment3_xml @Make, @Model </sql:query> </ROOT> '> <p><input type="submit"> </form> </body>
When a user opens this form, he or she is prompted to supply parameters (see Figure 14-16). After the form and query are submitted, Internet Explorer displays the result shown in Figure 14-17.
Figure 14-16
An HTML form for querying the database
SQL Server 2000 Stored Procedure & XML Programming
Figure 14-17
Result of query
You can polish this form if you add an XSL file to convert the XML result into an HTML form:
<head> <TITLE>Query Equipment</TITLE> </head> <body> <H3>Query Equipment (use % as wild card). </H3> <form action="http://localhost/Asset" method="POST"> Make: <input type=text name=Make value='Tosh%'><BR> Model: <input type=text name=Model value='Por%'> <input type=hidden name=contenttype value=text/xml> <input type=hidden name=xsl value="template\Equipment.xsl"> <input type=hidden name=template value=' <ROOT xmlns:sql="urn:schemas-microsoft-com:xml-sql" > <sql:header>
14: Publishing Information Using SQLXML
<sql:param name="Make">%</sql:param> <sql:param name="Model">%</sql:param> </sql:header> <sql:query> exec prListEquipment3_xml @Make, @Model </sql:query> </ROOT> '> <p><input type="submit"> </form> </body>
Now, you can assemble a more complex application by adding more forms, security, links between pages, and other elements, but this type of solution is really more suitable for simple search pages than for such complex applications.
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