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public class ShoppingCartData { public ShoppingCartData() { } public static objProduct GetProductPrice(string productid) { SqlConnection conn = null; SqlDataReader rdr = null; try { conn = new SqlConnection("Server=(local); DataBase=MyDatabase;Integrated Security=SSPI"); conn.Open(); SqlCommand cmd = new SqlCommand("My Special Proc Name", conn); cmd.CommandType = CommandType.StoredProcedure; rdr = cmd.ExecuteReader(); while (rdr.Read()) { // Fill the business object with the reader results. } } finally { // Clean up coding } } }

Next, the code pulls out an average time for each event via a custom SQL statement and the find_by_sql method:

and understanding object-oriented design, they are not required for understanding the object features of OCaml (and vice versa).

sql = "SELECT event, AVG(time) as average_time FROM events AS e INNER JOIN plays AS p ON e.play_id=p.id WHERE p.game_id='#{game_id_to_analyze}' AND p.player_id='#{player.id}' GROUP BY e.event DESC;" data = [] Event.find_by_sql(sql).each do |row| bar_chart.data row.event, (row.average_time.to_i/1000) end bar_chart.labels = {0=>'Time'} bar_chart.write("#{pic_dir}/player_#{player.id}.png") end

Microsoft s Enterprise Library can be an incredible time saver and is definitely worth a look. Microsoft now has a release available for Visual Studio 2005. This is one of those tools that developers either love or hate. Personally, I m a big fan of anything that cuts down on the amount of coding that I must do. Check it out for yourself at http://msdn.microsoft.com/practices/vs2005.

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. OCaml supports OOP This is what the Objective part of the OCaml name means. Saying this, however, does little to describe what that actually means. OCaml has rich support for programming with objects. An object is a thing that can also have functions associated with it. Unlike data types, which are just data, objects can include both data and functions. Functions in an object are also called methods. Classes in OCaml are

Each row contains an event description and an average time. You loop through these rows, and for each of those rows, you add a bar to your chart using the data method. After that, you set the column label and write your chart to a file. As you can see, even though Listing 3-4 is more complex than Listing 3-1, it s still fairly simple. Now let s try creating another type of chart with Gruff.

One of the main benefits of having a set-aside class for data access is that it helps you account for data source modifications. It is likely that you ll either be using a SQL helper class or perhaps Enterprise Library 2.0 for data access, and those particular methods would find their residence in this tier. I ll shed more light on these tiers as I demonstrate them with this chapter s sample application.

not data types, although they do have data types associated with them (for many programs and programmers, the difference is irrelevant). Objects can be inherited by other objects and extend their functionality. OCaml supports multiple inheritance and virtual objects. You will learn more about classes not being data types later in the chapter. For now, you should understand that classes have an associated type, but they are not types themselves. You can make class types independently of objects, which is a way of creating type information independent of the object in the same way that Java s interfaces and abstract classes in C++ do.

users = User.find(:all, :conditions=>['not is_admin'], :order=>'last_name ASC, first_name ASC' ) html = Erubis::Eruby.new(File.read('rewards_report_template.rhtml') ).evaluate({ :users=>users })

sNote A virtual object cannot be instantiated. An object must be declared virtual if it has any methods

Our database server lies at the bottom of the chain, but it certainly is not the lowest in importance. Here is where our stored procedures, tables, and much-acclaimed data reside. The data layer will communicate directly with the store; whether it be by OLEDB, ODBC, or other connection method, all calls end here. The server processes the requests, updates the appropriate information, and sends the process back up the chain of command.

You use an Erubis template to create your report HTML gradually. You create a new Erubis::Eruby object using the Erubis source from the file rewards_report_template.rhtml, and then call the evaluate method on it. The evaluate method takes a single argument, which is a list of variables that are accessible to the Eruby template.

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