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The XmlHttpRequest object is capable of so much more than just talking to a local text file. One method that has seen widespread implementation across the web is the HEAD request that could allow a browser to check the last-modified date of a URL. To achieve the message shown in Figure 3-7, we must once again refactor our code: if(xmlhttp) { xmlhttp.open("HEAD", "http://www.cnn.com", true); xmlhttp.onreadystatechange = function() { if(xmlhttp.readyState == 4) { if(xmlhttp.status == 200) { alert("Last modified on: " + xmlhttp.getResponseHeader("LastModified")); } } } xmlhttp.send(null); }

The first part of the code in Listing 7-2 connects to the database and creates a model for your transaction table. Most of the code in this book uses hard-coded values, but that s

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pos_cnum };; For example, the previous function could be called when a new line is encountered It would update the unmanaged portions of the position structure, enabling the information to be used You also can assign variables that contain regular expressions in the body They can then be used just like regular expressions in the regexp section For example, if you often use the following regexp for an IP address, you could assign that regexp to a value and use it instead (which would make your rule cleaner): let ip_addr = "['0'-'9'] ['0'-'9'] ['0'-'9']' '['0'-'9'] ['0'-'9'] ['0'-'9']''['0'-'9'] ['0'-'9'] ['0'-'9']''['0'-'9'] ['0'-'9'] ['0'-'9']" You can see this technique in the following ocamllex fragment: let ip_addr = "['0'-'9'] ['0'-'9'] ['0'-'9']''['0'-'9'] ['0'-'9'] ['0'-'9']' '['0'-'9'] ['0'-'9'] ['0'-'9']''['0'-'9'] ['0'-'9'] ['0'-'9']" rule tokens = parse ip_addr { Printfprintf "%s" (Lexinglexeme lexbuf) } | ip_addr as b { Printf.

We ve replaced the GET parameter with HEAD so that we will only be retrieving the HTTP headers of the web resource. Also notice that we ll be accessing the getResponseHeader() method of the instantiated object and returning the last-modified date of the page to the user, which is contained in the Last-Modified HTTP header. Should you find a need to return all of the response headers, you could simply replace the named getResponseHeader() with the generic getAllResponseHeaders(): if(xmlhttp.status == 200) { alert(xmlhttp.getAllResponseHeaders()); } Running the site with the preceding code will return results as shown in Figure 3-8.

not necessary. This particular listing lets you specify your connection details on the command line:

printf "%s" b } The preceding code demonstrates two ways to access the match string Because they are both the same, only the first one would be called if you actually ran this code..

Examining these response headers, you can likely surmise that all of the headers could be retrieved individually with the aforementioned getResponseHeader() method by simply passing in the header title as a parameter. Before we move on to more XmlHttpRequest functionality, Table 3-1 presents a quick summary of the overall capabilities that have been made available to us. Table 3-1. Common XmlHttpRequest Methods

(puts "usage: #{$0} mysql_hostname mysql_username " << "mysql_password database_name"; exit) unless ARGV.length==4 mysql_hostname, mysql_username, mysql_password, mysql_database= *ARGV ActiveRecord::Base.establish_connection( :adapter => "mysql", :host => mysql_hostname, :username => mysql_username, :password => mysql_password, :database => mysql_database) # Establish a connection to the database.

Regular Expressions Ocamllex supports regular expressions natively. The format for the regular expressions follows OCaml code restrictions with regard to escaping and formatting. In Table 16-1, you see the most common regular expression codes used in OCaml. Table 16-1. Regular Expressions Reference

First, the line checks if the proper number of arguments have been passed. If not, it tells the user what the program expects and exits. It uses the construct *ARGV to take the four arguments and put them in four separate variables. Then you create the connection to the database. Next is the SQL query that pulls the report from the database:

abort() getAllResponseHeaders() getResponseHeader() open() send() setRequestHeader()

'char' "string" _ [ set of char ] [ ^ negative set] eof #

SELECT WEEK(p1.date) as week_number, YEAR(p1.date) as year, COALESCE((SELECT SUM(ABS(p2.gross)) FROM paypal_transactions as p2 WHERE (WEEK(p2.date) = WEEK(p1.date) AND YEAR(p2.date) = YEAR(p1.date) AND WEEKDAY(p2.date) IN (5,6) AND p2.gross<0 AND p2.status='Completed') ),0) as weekend_amount, COALESCE((SELECT SUM(abs(p3.gross)) FROM paypal_transactions as p3 WHERE (WEEK(p3.date) = WEEK(p1.date) AND YEAR(p3.date) = YEAR(p1.date) AND WEEKDAY(p3.date) NOT IN (5,6) AND p3.gross<0 AND p3.status='Completed') ),0) as weekday_amount

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