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The Good
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LINQ exists because some weary programmers at Microsoft were tired of accessing data in their databases differently than they did their file-based data, or their inmemory object data, or their XML data. With LINQ, a single syntax lets you access all of these flavors of data, and more. The syntax itself is similar to SQL, the database query language already familiar to you, your programming associates, and a team of hackers at the FBI. Visual Basic 2008 includes LINQ support for SQL Server database tables and objects ( LINQ to SQL ), ADO.NET data sets ( LINQ to ADO.NET and LINQ to DataSet ), in-memory object collections such as arrays or Generic collections ( LINQ to Objects ), and XML ( LINQ to XML ). Soon after the official Visual Studio 2008 release, Microsoft released the ADO.NET Entity Framework ( LINQ to Entities ), which provides enhanced LINQ support to SQL Server, Oracle, DB2, and other database platforms. That s a great start, but the good news doesn t end there. LINQ is extensible. That means you can enhance LINQ so that it can query any type of data you specify. LINQ to Spreadsheet, LINQ to Tab-Delimited-File, and LINQ to DVD--Content are all possible. Is that a universal remote control I see in your programming language As exciting as those possibilities are, I don t have space in this book to show you how to develop them, and that s where the bad news comes in.
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The Bad
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LINQ is a swell system for querying data once you have established the connection between the query statements and the data. For some of the LINQ flavors, especially LINQ to Objects, there s not much to connect, so the querying is a snap. For other LINQ varieties, especially of the database sort, you must create go-between classes that join your requests to the data. LINQ is a generic technology that can interact with any data once you provide the glue. And that glue can sometimes get very sticky. As an example, consider LINQ to SQL. This LINQ implementation needs a class that represents the tables and records that you will query through LINQ. These classes aren t hard to create, and they look a lot like the original database tables. However, if you modify the structure of your table, you will need to modify the gobetween class to take advantage of the table changes. It s a task that you would have needed to do anyway, even without LINQ, but it s something to keep in mind when considering the way that some programmers go gaga over LINQ. The go-between nature of LINQ also means that some data processing may be slower when compared to accomplishing the same task without LINQ. Extra layers of data and code mean extra things for your computer to do. But that s already life in the world of the .NET Framework, so I wouldn t avoid LINQ because of it.
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What Is LINQ |
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Supporting Technologies
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LINQ is a big deal for Microsoft and for the .NET Framework. Most of the new features added to Visual Basic s 2008 edition were introduced primarily to support LINQ. Before we get into using LINQ, let s take a quick look at the technologies involved in making LINQ possible. Query expressions, the heart of data access through LINQ. This chapter discusses query expressions in detail. Lambda expressions, discussed in 9. Extension methods, covered in 12. Local type inference, discussed in 6. Anonymous types, something that is new to Visual Basic in 2008, but also something that I haven t discussed yet. I ll give you the details just after this list. Relaxed delegates, a feature that lets Visual Basic make educated guesses as to whether a method and a delegate are a match or not. It s similar to type inference, but for delegates instead of plain types. XML Literals, XML axis properties, embedded XML expressions, and XML namespace support within your source code. You probably remember all about these features from the discussion in 13. Nullable types, discussed in 6, with some extended discussion appearing in the Generics chapter, 16. Partial methods, first appearing in 8. Object initializers, demonstrated in 9. Other new language and compiler features that must not have been important enough since they didn t get their own new cool-sounding names.
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