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XML Support in SQL Server 2000
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HTML form for querying the database
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After the form and query are submitted, Internet Explorer displays the result (see Figure 12-30). You can polish this form if you add an XSL file that will convert the XML result into an HTML form:
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<head> <TITLE>Query Equipment</TITLE> </head> <body> <H3>Query Equipment (use % as wild card). </H3> <form action="http://C400/Asset" method="POST"> Make: <input type=text name=Make value='Tosh%'><BR> Model: <input type=text name=Model value='Por%'>
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SQL Server 2000 Stored Procedure Programming
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<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> <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>
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XML Support in SQL Server 2000
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.
SUMMARY
XML support is one of the hottest new features of SQL Server 2000. Two major areas for the use of XML are the publishing of database information and B2B exchange of information. SQL Server 2000 contains tools that are ideal for quick development of XML applications. The For XML clause of the Select statement can be used to accelerate development and reduce the development costs of XML applications. The flexibility of SQL Server s Explicit mode allows development of very complex XML documents. The power of the OpenXML statement allows Transact-SQL developers to access information stored in XML documents. When the hype around XML settles down, Transact-SQL developers like you will be faced with real world problems associated with XML support in SQL Server 2000. At the time of this writing, the performance of XML document generation and parsing is unknown. It is also debatable whether it is better (that is, faster) to perform conversions to XML documents in SQL Server (which does not scale-out as well as middleware servers with COM components) or to use DOM or SAX in the middle layer to achieve the same effect. Transact-SQL developers will be faced with a steep learning curve in order to utilize this new technology. XML documents are generated in components that are simply black boxes without much information that can be used to verify their integrity, and therefore design and debugging of XML documents and applications is not that simple. Later releases of SQL Server will target features for updating information in the database through HTTP (UpdateGrams), massive import and export of XML documents (Bulk XML), and SOAP support (Simple Object Access Protocol a lightweight protocol for exchanging messages and remote procedure calls).
SQL Server 2000 Stored Procedure Programming
EXERCISES
1. Create a stored procedure to return an element-centric XML document and schema with information about a specified Order. Associated tables are shown in the following diagram:
2. Create a stored procedure to return an XML document based on the content of the Order, OrderItem, and Equipment tables with the following structure:
<Order oid="1" OrderDate="1999-01-10T00:00:00"> <OrderItem id="2" InventoryId="5"> <Equipment EquipmentId="1" Make="Toshiba" Model="Portege 7020CT"/> </OrderItem> <OrderItem id="5" InventoryId="8"> <Equipment EquipmentId="5" Make="Bang & Olafson" Model="V4000"/> </OrderItem> </Order> <Order oid="6" OrderDate="2000-02-02T00:00:00">
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XML Support in SQL Server 2000
<OrderItem id="10" InventoryId="6"> <Equipment EquipmentId="6" Make="NEC" Model="V90"/> </OrderItem> <OrderItem id="11" InventoryId="25"> <Equipment EquipmentId="1" Make="Toshiba" Model="Portege 7020CT"/> </OrderItem> <OrderItem id="12" InventoryId="29"> <Equipment EquipmentId="35" Make="NEC" Model="Multisync III"/> </OrderItem> <OrderItem id="13" InventoryId="27"> <Equipment EquipmentId="34" Make="Toshiba" Model="Portege 7030CT"/> </OrderItem> </Order> <Order oid="7" OrderDate="2000-03-03T00:00:00"/> ...
3. Create a stored procedure that receives Order information in the form of an XML message, parses it, and stores it in tables.
APPENDIX A
T-SQL and XML Datatypes in SQL Server 2000
Terms of Use
SQL Server 2000 Stored Procedure Programming
n this appendix, you will find three tables that provide an overview of the datatypes in use in SQL Server 2000. Table A-1 lists all Transact-SQL datatypes, their synonyms, their most important attributes (range and size), as well as sample constants. Table A-2 lists XML datatypes, and Table A-3 provides a mapping between Transact-SQL and XML datatypes.
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