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To send the error messages to a file, in other words, to redirect FD2, the redirection operator is preceded by the FD Both standard output and standard error can be redirected on the same line The next command sends standard output to FILE and standard error to ERRORFILE: $ printf '%s\n%v\n' OK Oops! > FILE 2> ERRORFILE $ cat ERRORFILE bash4: printf: `v': invalid format character In this case, the error message is going to a special file, /dev/null Sometimes called the bit bucket, anything written to it is discarded printf '%s\n%v\n' OK Oops! 2>/dev/null Instead of sending output to a file, it can be redirected to another I/O stream by using >&N where N is the number of the file descriptor This command sends both standard output and standard error to FILE: printf '%s\n%v\n' OK Oops! > FILE 2>&1 Here, the order is important.

Every time a model instance is saved, updates the attribute to be the user who is currently logged in at the time. However, there are a few potential pitfalls with this approach. First, becomes a bit of a dumping ground for data. Nothing actively manages this dictionary, so there s no central place to look to find out what might be in it. Any code can put things in there, without any clear way of indicating that it did so. Taking that problem a step further, applications don t know what other code is already using , so there s no way to prevent name clashes. If two applications running in the same thread perhaps a view that calls out to a third-party library as part of its processing assign data to the same variable name, the later assignment wins. Even if an application actively checks for the presence of a name before assigning to it, there s no reasonable way to know if that application itself had previously assigned the variable or if another application is using the same name. The worst part about these issues is that they re intermittent. Whether they cause any real problems depends entirely on what applications use and which ones

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n the previous chapter, you had your first look at ADO.NET, and you examined connection-based data access. Now, it s time to bring your data access code into a well-designed application. In a properly organized application, your data access code is never embedded directly in the code-behind for a page. Instead, it s separated into a dedicated data component. In this chapter, you ll see how to create a simple data access class of your own, adding a separate method for each data task you need to perform. Best of all, this data class isn t limited to code-intensive scenarios. In the next chapter, you ll see how to consume your class with ASP.NET s new data binding infrastructure. This chapter also tackles disconnected data the ADO.NET features that revolve around the DataSet and allow you to interact with data long after you ve closed the connection to the data source. The DataSet isn t required in ASP.NET pages. However, it gives you more flexibility for navigating, filtering, and sorting your data topics you ll consider in this chapter.

The information you ll see in this chapter hasn t changed much from ASP.NET 1.x. You use the same techniques to build a good database component, and the DataSet works in the same way (along with a few refinements). For a more detailed look at ADO.NET and how you can use it with a variety of .NET application types, refer to Pro ADO.NET 2.0 (Apress, 2005).

In professional applications, database code is not embedded directly in the client but encapsulated in a dedicated class. To perform a database operation, the client creates an instance of this class and calls the appropriate method. When creating a data class, you should follow the basic guidelines in this section. This will ensure that you create a well-encapsulated, optimized database component that can be executed in a separate process, if needed, and even used in a load-balancing configuration with multiple servers. Open and close connections quickly: Open the database connection in every method call, and close it before the method ends. Connections should never be held open between client requests, and the client should have no control over how connections are acquired or when they are released. If the client does have this ability, it introduces the possibility that a connection might not be closed as quickly as possible or might be inadvertently left open, which hampers scalability. Implement error handling: Use error handling to make sure the connection is closed even if the SQL command generates an exception. Remember, connections are a finite resource, and using them for even a few extra seconds can have a major overall effect on performance.

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