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department = 'EGR'; Look at the first keyword again Notice how the select_init code block sets the LEX structure s sql_command to SQLCOM_SELECT This is important because the next function in the query path uses this in a large switch statement to further control the flow of the query through the server The example SELECT statement has three fields in the field list Let s try and find that in the parser code Look for the add_item_to_list() function call That is where the parser detects the fields and places them in the LEX structure You will also see a few lines up from that call the parser code that identifies the * option for the field list OK, now you ve got the sql_command member variable set and the fields identified So where does the FROM clause get detected Look for the code statement that begins with FROM join_table_list where_clause.

of an operation. For example, we can ensure that the web response from the previous example is closed as follows: let httpViaTryFinally(url: string) = let req = System.Net.WebRequest.Create(url) let resp = req.GetResponse() try let stream = resp.GetResponseStream() let reader = new StreamReader(stream) let html = reader.ReadToEnd() html finally resp.Close() In practice, you can use a shorter form to close and dispose of resources, simply by using a use binding instead of a let binding. This closes the response at the end of the scope of the resp variable, a technique is discussed in full in 8. Here is how the previous function looks using this form: let httpViaUseBinding(url: string) = let req = System.Net.WebRequest.Create(url) use resp = req.GetResponse() let stream = resp.GetResponseStream() let reader = new StreamReader(stream) let html = reader.ReadToEnd() html

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Table 3-13 includes many uses of types such as seq<'T>. When a type appears as the type of an argument, the function accepts any value that s compatible with this type. 5 explains the notions of subtyping and compatibility in more detail; the concept should be familiar to OO programmers because it s the same as that used by other .NET languages such as C#, which itself is close to that used by Java. In practice, you can easily discover which types are compatible with which by using F# Interactive and tools such as Visual Studio: when you hover over a type name, the compatible types are shown. You can also refer to the online documentation for the F# libraries and the .NET Framework, which you can easily search using the major search engines. Here are some of the types compatible with seq<'T>: Array types: For example, int[] is compatible with seq<int>. F# list types: For example, int list is compatible with seq<int>. All other F# and .NET collection types: For example, System.Collections.Generic.SortedList<string> is compatible with seq<string>.

This code is the part of the parser that identifies the FROM and WHERE clause (and others) The code for the parser that processes these clauses is not included in Listing 3-8, but I think you get the idea If you open the sql_yaccyy source file (located in /sql), you should now be able to find all of those statements and see how the rest of the LEX structure is filled in with the table list in the FROM clause and the expression in the WHERE clause..

The following types aren t directly type compatible with seq<'T> but can be converted readily into sequences when needed:

F# lets you define new kinds of exception objects that carry data in a conveniently accessible form. For example, here is a declaration of a new class of exceptions and a function that wraps http with a filter that catches particular cases: exception BlockedURL of string let http2 url = if url = "http://www.kaos.org" then raise(BlockedURL(url)) else http url The information from F# exception values can be extracted, again using pattern matching: > try raise(BlockedURL("http://www.kaos.org")) with | BlockedURL(url) -> printf "blocked! url = '%s'\n" url;; blocked! url = 'http://www.kaos.org'

Note Some Windows distributions do not include the sql_yacc.yy file. If you use Windows and do not

Some .NET types are compatible with a somewhat deprecated nongeneric .NET 1.0 construct called System.Collections.IEnumerable (note the absence of any generic parameter) but aren t compatible with the newer .NET construct System.Collections.Generic.IEnumerable<type>, called seq<type> in F# code. Some .NET types such as System.Text.RegularExpressions.MatchCollection support only a GetEnumerator method and can t be used directly as values of type seq<type>. However, you can convert them into sequences by using them in conjunction with the sequence expression syntax mentioned earlier, such as seq { for x in matchCollection -> x } or for x in matchCollection do ....

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