By Chad Pytel
professional lively list is helping you're taking benefit of the entire energy of your database engine from inside your Ruby courses and Rails purposes. ActiveRecord, a part of the magic that makes the Rails framework so strong and simple to exploit, is the version portion of Rails model/view/controller framework. Its an object-relational mapping library allowing you to have interaction with databases from either Ruby and Rails purposes.
Because ActiveRecord is configured with default assumptions that mesh completely with the Rails framework, Rails builders frequently locate they rarely want give it some thought in any respect. in spite of the fact that, while you are constructing in Ruby with out Rails, or are deploying opposed to legacy databases designed with out Rails in brain, otherwise you simply are looking to benefit from database-specific gains resembling huge gadgets and saved techniques, you would like the in-depth wisdom of ActiveRecord present in this e-book.
In seasoned lively list , authors Kevin Marshall, Chad Pytel, and Jon Yurek stroll you thru each step from the fundamentals of having and fitting the ActiveRecord library to operating with legacy schema to utilizing positive aspects particular to every of todays most well-liked database engines, together with Oracle, MS SQL, MySQL, and extra! You’ll come to a deep knowing of ActiveRecord that might enable you actually take advantage of all that Ruby, Rails, and your preferred database platform need to offer.
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Extra info for Pro Active Record: Databases with Ruby and Rails
Sslcert: Required parameter if you are connecting to a MySQL database via SSL. sslca: Required parameter if you are connecting to a MySQL database via SSL. sslcapath: Required parameter if you are connecting to a MySQL database via SSL. sslcipher: Required parameter if you are connecting to a MySQL database via SSL. establish_connection(:adapter => "mysql", :database => "test", :username => "kevin", :password => "test") OpenBase Parameters The minimum OpenBase requirements are the adapter and database parameters.
It will also make sure to properly convert data types, like the date used in the previous example, into whatever format your database expects. :include Here, we have the FROM clause in your SQL statement. The :include parameter will take a (potentially very) nested hash of symbols that corresponds to the names of relationships you’ve defined for your model, and add them as joining conditions. city = `Boston` The SQL will look like the preceding statement under most circumstances. However, if the tables included loop back on themselves, the table names will need to be relabeled.
But as you can imagine, this is a difficult goal to achieve. Databases, like any software application, continue to grow more and more complex and add new features all the time. With all this in mind, I recommend that you become as familiar as you can with the specific database application you intend to use. I also highly recommend that you learn at least the basics of ANSI SQL. These two chores will help you tremendously throughout your career in debugging and developing even the most advanced Active Record programs.
Pro Active Record: Databases with Ruby and Rails by Chad Pytel