Ruby ActiveRecord and MySQL: Ruby Study Notes - Best Ruby Guide, Ruby Tutorial

Ruby ActiveRecord and MySQL: Ruby Study Notes - Best Ruby Guide, Ruby Tutorial:

We shall look at code examples explaining how to connect to a MySQL database using Ruby and ActiveRecord . ActiveRecord Rails uses ORM , which stands for object-relational mapping. ORM libraries map database tables to classes. If a database has a table called orders, our program will have a class named Order. Rows in this table correspond to objects of the class - a particular order is represented as an object of class Order. Within that object, attributes are used to get and set the individual columns. Our Order object has methods to get and set the amount, the sales tax, and so on. In addition, the Rails classes that wrap our database tables provide a set of class-level methods that perform table-level operations. For example, we might need to find the order with a particular id. This is implemented as a class method that returns the corresponding Order object. So an ORM...

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