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Now we are going to write some metaprograms that manipulate programs by adding methods or properties to a class or to an instance of a class. We will do the same exercise three times for three different languages first Ruby, then Python, and finally C# through DLR. Even though C# does not in general support the kind of metaprogramming we discuss in this section, you will see that with the DLR, C# as well as VB.NET developers can benefit the metaprogramming techniques that Ruby and Python developers enjoy. The metaprogramming technique we discuss in this section is the foundation that enables many marvelous applications. As you ll see later in this chapter, we will take what we build in this section to add methods and properties to a C# class or its instances and use it to facilitate runtime code generation.

ImageX is a command-line tool used to take complete system image copies of Vista for use in a WinPE deployment environment. 3 covers this command in detail.

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In most cases, you will want to return more than a single field from the database. Here is a typical iteration pattern for stepping through the result set: $type = 'page'; $status = 1; $result = db_query("SELECT nid, title FROM {node} WHERE type = :type AND status = :status", array( ':type' => $type, ':status' => 1, )); foreach ($result as $row) { echo $row->title."<br/>"; } The preceding code snippet will print out the title of all published nodes that are of type page (the status field in the node table is 0 for unpublished nodes and 1 for published nodes). The call to db_query returns an array of results, with each element of the array being a row from the table that matches the criteria specified in the query. Using foreach I m able to iterate through the result set array, and in the preceding case, print out the title of each of the nodes on a separate line.

One of the new features that Drupal 7 provides is the ability to construct query objects using a query builder. In the previous examples, my queries were relatively simple, but what if I had more complex queries to write That s where the query builder using query objects comes in handy. Let me show you an example, and then I ll build on the concept as I demonstrate the creation of more complex queries in Drupal 7. In an earlier example, I created a query that selected values from the role table where the role ID was greater than or equal to 2. The query that I used is as follows:

robocopy is the most robust (which is where it gets its name) file-copy utility available on Windows system. Used simply, its syntax is as follows:

Now we ll see how to define a class in Ruby and then dynamically modify the class The examples will show you how to add methods to a class so that all instances of the class support those methods You can also add methods only to a specific instance In that case, only that specific instance will support those methods and all other instances of the same class will not You can try out this section s Ruby code by typing it in an interactive Ruby console Alternatively, since I have put all the code for this section in the metaExamplesrb file in the MetaExamples project of this chapter s code download, you can simply run the MetaExamples project in debug mode The MetaExamples project is a NET console application.

$result = db_query('SELECT name FROM {role} WHERE rid = :rid', array(':rid' => 2)); I ll write the same query using a query object and the query builder. First I ll create the query object by selecting the table that I want to use and assign an identifier to the table (the r) so I can reference fields from that table. $query = db_select('role', 'r'); Next I ll expand the query to include a condition that must be met (rid = 2) and the fields that I want returned from the query. $query ->condition('rid', 2) ->fields('r', array('name')); Finally I ll execute the query and assign the result set to $result. $result = $query->execute(); I ll print out the results by iterating through the array returned from the query. foreach($result as $row) { echo $row->name."<br/>"; } Using the query object and query builder makes it easier to construct complex database queries. I ll demonstrate how to use the query builder in the following examples.

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