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Dynamic sorting on the client with JavaScript and XSLT is good because: JavaScript can alter the sort settings and reapply the new sort transformation. Using JavaScript to modify the sort criteria is easier than storing the data in client-side arrays and reordering them. Using a client-side solution removes the overhead and processing time that would be required if using a server-side solution. The web page needs to use slightly different JavaScript to achieve dynamic sorting for IE 6 compared with Mozilla. IE uses ActiveX controls to load and transform stylesheets, whereas Mozilla uses the TransforMiiX XSLT processor. The code in this exercise is for IE 6 only. In 8, I ll show you a JavaScript library that supports both IE and Mozilla. This example uses the files planets10.xml and planets10.xsl. The new stylesheet follows: < xml version="1.0" encoding="UTF-8" > <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:template match="neighbours"> <table border="1"> <tr> <th>Name</th> <th>Position from sun</th> <th>Diameter</th> <th>Moons</th> <th>Mean temp</th>

BEGIN TRANSACTION: This marks the beginning of a transaction. COMMIT TRANSACTION: This marks the successful end of a transaction. It signals the database to save the work. ROLLBACK TRANSACTION: This denotes that a transaction hasn t been successful and signals the database to roll back to the state it was in prior to the transaction.

If all goes according to plan, you should see a direct mapping from the DSL model and the structure of the data model reflected in the database..

Note that there is no END TRANSACTION statement. Transactions end on (explicit or implicit) commits and rollbacks.

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</tr> <xsl:apply-templates> <xsl:sort select="@name" order="ascending"/> </xsl:apply-templates> </table> </xsl:template> <xsl:template match="planet"> <tr><td><xsl:value-of select="@name"/></td><xsl:apply-templates/></tr> </xsl:template> <xsl:template match="positionFromSun"> <td><xsl:value-of select="text()"/></td> </xsl:template> <xsl:template match="diameter"> <td><xsl:value-of select="text()"/></td> </xsl:template> <xsl:template match="moons"> <td><xsl:value-of select="text()"/></td> </xsl:template> <xsl:template match="meanTemp"> <td><xsl:value-of select="text()"/></td> </xsl:template> <xsl:template match="text()"/> </xsl:stylesheet> The stylesheet creates a page containing a table. The stylesheet matches the <neighbours> element in the XML document to create the <table> tags and headings. At the same time, it applies ascending alphabetic sorting into planet-name order: <xsl:template match="neighbours"> <table border="1"> <tr> <th>Name</th> <th>Position from sun</th> <th>Diameter</th> <th>Moons</th> <th>Mean temp</th> </tr> <xsl:apply-templates> <xsl:sort select="@name" order="ascending"/> </xsl:apply-templates> </table> </xsl:template> The details of each planet are displayed in a template that matches the <planet> element: <xsl:template match="planet"> <tr><td><xsl:value-of select="@name"/></td><xsl:apply-templates/></tr> </xsl:template>

s Note All our example programs to this point have run in SQL Server s default autocommit mode, i.e., SQL

Server implicitly committed or rolled back each statement depending on its success or failure. Autocommit mode can t provide atomicity and consistency for multiple statements. It s also a potentially prohibitively expensive way to do things if you need to perform many (thousands or millions, but sometimes even just hundreds) of inserts. How to design transactions to handle such heavy loads is beyond the scope of this book, but what you learn here forms the basis for designing solutions for all transactional situations.

Think of the word schema as meaning a complete description of a database in a formal language supported by the database management system. A schema will include a formal description of all tables included in the database, their relationships and constraints, and other information needed for creating or reconstructing the database. A schema should be a complete description of the structure of the database, but will say nothing about the actual data contained in it. I introduce the term here because, in the context of SQL Server Modeling, it can often be used more or less synonymously with the word model. Schema is more appropriately used in the database context, whereas model is used in the modeling context. But the two terms are closely linked in the context of the SQL Server Modeling framework.

Templates match individual child elements to display their details in the table: <xsl:template match="positionFromSun"> <td><xsl:value-of select="text()"/></td> </xsl:template> <xsl:template match="diameter"> <td><xsl:value-of select="text()"/></td> </xsl:template> <xsl:template match="moons"> <td><xsl:value-of select="text()"/></td> </xsl:template> <xsl:template match="meanTemp"> <td><xsl:value-of select="text()"/></td> </xsl:template> <xsl:template match="text()"/> </xsl:stylesheet> Figure 7-3 shows how the table appears in IE.

We ll use a stored procedure to practice coding transactions in SQL. It s an intentionally artificial example but representative of transaction processing fundamentals. It keeps things simple so you can focus on the important issue of what can happen in a transaction. That s what you really need to understand, especially when you later code the same transaction in Visual Basic.

s Warning Using ROLLBACK and COMMIT inside stored procedures typically requires careful consideration

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