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Figure 16-15. A concurrency error in action Matching every field is an acceptable approach for small records, but it isn t the most efficient strategy if you have tables with huge amounts of data. In this situation, you have two possible solutions: you can match some of the fields (leaving out the ones with really big values) or you can add a timestamp field to your database table, and use that for concurrency checking. Timestamps are special fields that the database uses to keep track of the state of a record. Whenever any change is made to a record, the database engine updates the timestamp field, giving it a new, automatically generated value. The purpose of a timestamp field is to make strict concurrency checking easier. When you attempt to perform an update to a table that includes a timestamp field, you use a Where clause that matches the appropriate unique ID value (like ProductID) and the timestamp field: UpdateCommand="UPDATE Products SET ProductName=@ProductName, UnitPrice=@UnitPrice, UnitsInStock=@UnitsInStock, UnitsOnOrder=@UnitsOnOrder, ReorderLevel=@ReorderLevel, Discontinued=@Discontinued WHERE ProductID=@ProductID AND RowTimestamp=@RowTimestamp" The database engine uses the ProductID to look up the matching record. Then, it attempts to match the timestamp in order to update the record. If the timestamp matches, you know the record hasn t been changed. The actual value of the timestamp isn t important, because that s controlled by the database. You just need to know whether it s changed. Creating a timestamp is easy. In SQL Server, you create a timestamp field using the timestamp data type. In other database products, timestamps are sometimes called row versions.

Listing 3-2. Creating a Simple Chart with Scruffy (widget_chart_scruffy.rb)

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.NET. First, you learned an This chapter presented a thorough overview of data binding in ASP interesting way to create dynamic text with simple data binding. Although this is a reasonable approach to get information into your page, it doesn t surpass what you can already do with pure code. You also learned how ASP.NET builds on this infrastructure with much more useful features, including repeated-value binding for quick-and-easy data display in a list control, and data source controls, which let you create code-free bound pages. Using the techniques in this chapter, you can create a wide range of data-bound pages. However, if you want to create a page that incorporates record editing, sorting, and other more advanced tricks, the data binding features you ve learned about so far are just the first step. You ll also need to turn to specialized controls, such as the DetailsView and the GridView, which build upon these data binding features. You ll learn how to master these controls in the next chapter. In 23 you ll learn how to extend your data binding skills to work with data access components.

You can also log errors to a custom log. For example, you could create a log with your company name and add records to it for all your ASP .NET applications. You might even want to create an individual log for a particularly large application and use the Source property of each entry to indicate the page (or web service method) that caused the problem. Accessing a custom log is easy you just need to use a different constructor for the EventLog class to specify the custom log name. You also need to register an event source for the log. This initial step needs to be performed only once in fact, you ll receive an error if you try to create the same event source. Typically, you ll use the name of the application as the event source. Here s an example that uses a custom log named ProseTech and registers the event source DivideByZeroApp: // Register the event source if needed. if (!EventLog.SourceExists("ProseTech")) { // This registers the event source and creates the custom log, // if needed. EventLog.CreateEventSource("DivideByZeroApp", "ProseTech"); } // Open the log. If the log doesn't exist, // it will be created automatically. EventLog log = new EventLog("ProseTech"); log.Source = "DivideByZeroApp"; log.WriteEntry(err.Message, EventLogEntryType.Error); If you specify the name of a log that doesn t exist when you use the CreateEventSource() method, the system will create a new, custom event log for you the first time you write an entry.

<script type="text/javascript"> var xmlHttp; function createXMLHttpRequest() { if (window.ActiveXObject) { xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); } else if (window.XMLHttpRequest) { xmlHttp = new XMLHttpRequest(); } } function getSecretMessage() { createXMLHttpRequest(); xmlHttp.onreadystatechange = handleStateChange; xmlHttp.open("GET", "ajaxResponse.jsp", true); xmlHttp.send(null); } function handleStateChange() { if(xmlHttp.readyState == 4) { if(xmlHttp.status == 200) { document.getElementById("secretMessage").innerHTML = xmlHttp.responseText; } } } </script> </head> <body> <h1>Test Ajax with Selenium</h1> <input type="button" id="button" name="button" value="Click me to get secret message from server" onclick="getSecretMessage();"/> <br/><br/> <div id="secretMessage"> </div> </body> </html>

require 'scruffy' sprocket_output = [["Jan",500], ["Feb",750], ["Apr",380]] widget_output = [["Jan",350], ["Feb",650], ["Apr",560]]

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