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Metaprogramming is everywhere in the DLR. All the LINQ Expression examples you saw in 2 and all the DLR Hosting API examples you saw in 6 are metaprograms. Because metaprogramming plays such a pervasive role in the DLR, we re going to dive deeper into the subject and show you some advanced and marvelous uses of metaprogramming. We will begin with an overview of metaprogramming. The overview will discuss what metaprogramming is and where it is used in the DLR, then we ll look at one type of metaprogramming that adds and removes methods or properties to or from a class or an instance of a class. We will illustrate the metaprogramming technique in Ruby and Python, then write some infrastructure code that enables us to use the same kind of metaprogramming technique in C# through the DLR. The infrastructure code will consist of two classes called ClassMetaObject and ExpandoClass. We will then take a detour and build a custom LINQ query provider. The purpose of this exercise is to illustrate a typical use of DLR Expression as a metaprogramming technique. The exciting thing about the custom LINQ query provider is that we are going to gradually evolve it into a code-generation framework that utilizes the ClassMetaObject and ExpandoClass classes. At the end, we will arrive at a code-generation framework that is in spirit similar to frameworks such as the popular Ruby on Rails.

This example is for connecting to a MySQL database. PostgreSQL users would prefix the connection string with pgsql instead of mysql. Obviously, the database name, username, and password used here must be valid for your database. They are database credentials, not Drupal credentials, and they are established when you set up the database account using your database s tools. Drupal s installer asks for the username and password so that it can build the $databases array in your settings.php file. If you are using sqlite as the database for your site, the setup is slightly simpler. The driver should be set to sqlite, and the database should be set to the path including the name of the database. $databases['default']['default'] = array( 'driver' => 'sqlite', 'database' => '/path/to/databasefilename', );

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Further details about these connections, including DNS server IP addressing, Media Access Control (MAC) addresses, and DHCP details, are available using the /all switch as follows:

Working with a database abstraction API is something you will not fully appreciate until you try to live without one again Have you ever had a project where you needed to change database systems and you spent days sifting through your code to change database-specific function calls and queries With an abstraction layer, you no longer have to keep track of nuances in function names for different database systems, and as long as your queries are American National Standards Institute (ANSI) SQL compliant, you will not need to write separate queries for different databases For example, rather than calling mysql_query() or pg_query(), Drupal uses db_query(), which keeps the business logic databaseagnostic Drupal 7 s database abstraction layer is based on PHP s Data Object (PDO) library and serves two main purposes The first is to keep your code from being tied to any one database.

Metaprograms are programs that generate or manipulate other programs, and metaprogramming is, of course, the writing of metaprograms Based on these definitions, you can see why the LINQ Expression examples in 2 are metaprograms They are metaprograms because, in those examples, we construct LINQ expression trees and use those trees to generate executable IL code The code we write to construct and compile LINQ expression trees is a metaprogram The programs manipulated by the metaprograms consist of code represented by the LINQ expression tree Similarly, the DLR Hosting API examples in 6 are metaprograms because those examples take Python code or Ruby code as input and manipulate the code by running it and interacting with it The DLR Hosting API examples are metaprograms and the Python code and Ruby code are the programs manipulated by the metaprograms It s common to see the concept of code as data in metaprograms.

The second is to sanitize user-submitted data placed into queries to prevent SQL injection attacks This layer was built on the principle that writing SQL is more convenient than learning a new abstraction layer language Drupal also has a schema API, which allows you to describe your database schema (that is, which tables and fields you will be using) to Drupal in a general manner and have Drupal translate that into specifics for the database you are using We ll cover that in a bit when we talk about install files Drupal determines the type of database to connect to by inspecting the $database array inside your settingsphp file For example, if $databases['default']['default']['driver'] is set to mysql, then Drupal will include includes/databasemysqlinc If it is equal to pgsql, Drupal will include includes/ databasepgsqlinc, and if it is equal to sqlite, Drupal will include includes/databasesqlite.

Further switches are available that control DHCP leased addresses, such as /release and /renew, where an adapter can relinquish its IP address and then request a new one if there is a problem with the lease. Sometimes with dial-up connections this is necessary if you are dialed in over a long period of time.

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