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SQL Server 2000 Stored Procedure Programming
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Using Query The <sql:query> element is used to specify one or more Transact-SQL statements. The following template file queries the Equipment table:
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<root xmlns:sql='urn:schemas-microsoft-com:xml-sql'> <sql:query> select * from Equipment for XML auto, elements </sql:query> </root>
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If the template file is saved in ListEqupment.xml in the template folder, it can be executed using the following URL:
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http://dejan/asset/template/ListEquipment.xml
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You can see the result in Figure 12-17.
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Figure 12-17.
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The result of an XML template designed for accessing database information
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XML Support in SQL Server 2000
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NOTE: The template file can contain more than one <sql:query> (and <sql:XPath-query>). It is important to know that all queries contained within separate elements are treated as separate transactions. Even if some of these transactions fail, others will be executed independently.
Using Parameters If the Transact-SQL statements contain parameters, they are defined in the <sql:header> element. The parameter s definition contains the name of the parameter and the default value to be assigned to the parameter if a value is not specified:
<sql:param name=parameter_name>default_value</sql:param>
The following example contains a simple template file with two parameters:
<root xmlns:sql='urn:schemas-microsoft-com:xml-sql'> <sql:header> <sql:param name='Make' >Toshiba</sql:param> <sql:param name='Model'>Portege 7020CT</sql:param> </sql:header> <sql:query> exec prGetEquipment2_xml @Make, @Model </sql:query> </root>
Let s assume that the template is stored in the GetEquipment.xml file in the template folder. As usual, the parameter list in the URL starts with a character. If multiple parameters are listed, they should be delimited with an & character. Parameters such as strings (that are delimited with quotes in Transact-SQL) must be delimited without quotes, as shown in the following URL:
http://dejan/asset/template/GetEquipment2.xml Make=Toshiba&Model =Portege%207020CT
You can see the result in Figure 12-18.
SQL Server 2000 Stored Procedure Programming
Figure 12-18.
The result of an XML template with parameters
Using XSL It is possible to use XSL files to change the way information is presented in a Web browser. The following template references a query (stored procedure) that provides an XML result and an XSL file that converts it to HTML (Equipment.xsl):
< xml version ='1.0' encoding='UTF-8' > <root xmlns:sql='urn:schemas-microsoft-com:xml-sql' sql:xsl='/Equipment.xsl'> <sql:query> exec prListEquipment2_xml </sql:query> </root>
If you execute just the stored procedure (for example, from Query Analyzer), you can see the simple XML document it produces:
12:
XML Support in SQL Server 2000
<Equipment EquipmentId="1" Make="Toshiba" Model="Portege 7020CT"> <EqType EqType="Desktop"/> </Equipment> <Equipment EquipmentId="2" Make="Sony" Model="Trinitron 17XE"> <EqType EqType="Monitor"/> </Equipment> <Equipment EquipmentId="6" Make="NEC" Model="V90"> <EqType EqType="Desktop"/> </Equipment> ...
The XSL file shown in the following code snippet describes how the XML file is converted:
< xml version='1.0' encoding='UTF-8' > <xsl:stylesheet xmlns:xsl='http://www.w3.org/TR/WD-xsl' > <xsl:template match = '*'> <xsl:apply-templates /> </xsl:template> <xsl:template match = 'Equipment'> <TR> <TD><xsl:value-of select = '@EquipmentId' /></TD> <TD><xsl:value-of select = '@Make' /></TD> <TD><xsl:value-of select = '@Model' /></TD> <TD><xsl:value-of select = './EqType/@EqType' /></TD> </TR> </xsl:template> <xsl:template match = '/'> <HTML> <HEAD> <title>Equipment</title>
SQL Server 2000 Stored Procedure Programming
</HEAD> <BODY> <TABLE border = "1" width="100%"> <TR><TH colspan="4" bgcolor="#000000"> <p align="left"><font color="#FFFFFF" face="Arial"> <b>Equipment</b> </font> </p> </TH></TR> <TR> <TH align="left" bgcolor="#C0C0C0"> <b><font face="Arial" size="2"> Equipment ID </font></b> </TH> <TH align="left" bgcolor="#C0C0C0"> <b><font face="Arial" size="2"> Make </font></b> </TH> <TH align="left" bgcolor="#C0C0C0"> <b><font face="Arial" size="2"> Model </font></b> </TH> <TH align="left" bgcolor="#C0C0C0"> <b><font face="Arial" size="2"> Equipment Type </font></b> </TH> </TR> <xsl:apply-templates select = 'root' /> </TABLE> </BODY> </HTML> </xsl:template> </xsl:stylesheet>
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You can distinguish two segments within the XSL file. The last <xsl:template match = / > element defines the static part of the HTML page. It consists of the <HEAD> and <BODY> tags of the HTML page and the definition of the table (the <TABLE> tag). Because of the match = / attribute, the described transformation is performed on the root node of the XML document. The second <xsl:template match = Equipment > element is applied on each element node called Equipment . Each node is converted to a row within an HTML table (using row <TR> and column <TD> tags):
<xsl:template match = 'Equipment'> </TR> <TD><xsl:value-of select = '@EquipmentId' /></TD> <TD><xsl:value-of select = '@Make' /></TD> <TD><xsl:value-of select = '@Model' /></TD> <TD><xsl:value-of select = 'EqType/@EqType' /></TD> </TR> </xsl:template>
The <xsl:value-of> elements define the source from which the parser obtains the values of the table cells. Recall that in the XPath section earlier in this chapter, @EquipmentId referred to an attribute called EquipmentId (not a Transact-SQL local variable). The last node reference ( EqType/@EqType ) is most interesting. It first points to a child node named EqType and then to its attribute named EqType. To execute the template file, you can specify the following URL:
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