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queries, however, are obviously greatly simpli ed by this architecture Consider the following LINQ to SQL query:
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Here we use LINQ s hierarchical structure to move from the Customers table to the Orders table to the Order_Details table without breaking a sweat:
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The next line really helps show the power of LINQ hierarchies:
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The identi er represents an instance of a class containing the data from a row of the Order_Details table Order_Details has a relationship with the Product table, which has a relationship with the Category table, which has We can slice right through that complex relaa eld called tionship by simply writing this:
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LINQ s hierarchical structure shines a clarifying light on the relational data in your programs Even complex relational models become intuitive and easy to manipulate We can then order and group the results of our query with a few simple LINQ operators:
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3: The Essence of LINQ
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Trying to write the equivalent code using a more conventional C# style of programming is an exercise that might take two or three pages of convostatements Even luted code and involve a number of nested loops and writing the same query in standard SQL would be a challenge for many developers Here we perform the whole operation in nine easy-to-read lines of code In this section, I have introduced you to the power of LINQ s hierarchical style of programming without delving into the details of how such queries work Later in this book you will learn how easy it is to compose your own hierarchical queries For now you only need to understand two simple points: There is a big difference between LINQ s hierarchical structure and the at, rectangular columns and rows returned by an SQL query Many bene ts arise from this more powerful structure These include the intuitive structure of the data and the ease with which you can write queries against this model
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The last two foundations of LINQ shed light on its exibility and power If you understand these two features and how to use them, you will be able to tap into some very powerful technology Of course, this chapter only introduces these features; they are discussed in more detail in the rest of the book LINQ queries are composable: You can combine them in multiple ways, and one query can be used as the building block for yet another query To see how this works, let s look at a simple query:
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The variable that is returned from the query is sometimes called a compuloop and display the address eld from the tation If you write a customers returned by this computation, you see the following output:
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You can now write a second query against the results of this query:
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Notice that the last word in the rst line of this query is the computation returned from the previous query This second query produces the following output:
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LINQ to Objects queries are composable because they operate on and In other words, LINQ usually return variables of type queries typically follow this pattern:
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This is a simple mechanism to understand, but it yields powerful results It allows you to take complex problems, break them into manageable pieces, and solve them with code that is easy to understand and easy to maintain in the next chapter You will hear much more about The next chapter also details a feature called deferred execution Although it can be confusing to newcomers, one of the bene ts of deferred execution is that it allows you to compose multiple queries and string them together without necessarily needing to have each query entail an expensive hit against the server Instead, three or four queries can execute without ever sending a query across the wire to your database Then, when you need to access the result from your query, a SQL statement is written that combines the results of all your queries and sends it across the wire only once Deferred execution is a powerful feature, but you need to wait until the next chapter for a full explanation of how and why it works The key point to grasp now is that it enables you to compose multiple queries as shown here, without having to take an expensive hit each time one executes
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