Ruby On Rails SQLite3

Learn how to use Ruby on Rails and SQLite3 with an example: create a web app and interact with a database.

Ruby on Rails and SQLite3

Ruby on Rails is a powerful web application framework that is popular among developers for its ease of use and ability to quickly create web applications. It is based on the Model-View-Controller (MVC) architecture, which helps to separate the presentation, logic, and data layers of an application. Rails is written in the Ruby programming language, and is often paired with the SQLite3 database.

Using Ruby on Rails and SQLite3 can help developers rapidly create web applications with a robust database backend. SQLite3 is a powerful yet lightweight SQL database engine that is embedded into the Rails application. This means that developers can easily create, modify, and manage their database without having to install a separate database server. It is also very easy to use, and allows developers to quickly write queries using Structured Query Language (SQL).

In order to use SQLite3 in Ruby on Rails, the database must first be connected. This is done by creating a configuration file, which contains the database connection information. The code below shows an example configuration file that will connect to an SQLite3 database named "my_database":

development:
  adapter: sqlite3
  database: db/my_database.sqlite3
  pool: 5
  timeout: 5000

Once the configuration file is created, the database can be connected using the ActiveRecord class. This class provides an interface for creating, querying, and updating database records using object-oriented Ruby code. The following example shows how to use the ActiveRecord class to connect to an SQLite3 database:

ActiveRecord::Base.establish_connection(
  adapter: 'sqlite3',
  database: 'db/my_database.sqlite3'
)

Once the database is connected, developers can use Ruby on Rails and SQLite3 to create models, queries, and updates for their application. Models are classes that define the structure of database records, and allow developers to easily access and manipulate data. Queries allow developers to retrieve data from the database, and updates allow them to edit or delete existing records. For example, the following code shows how to create a model, query, and update for an SQLite3 database:

# Create the model
class User < ActiveRecord::Base
  # Define attributes
  attr_accessor :name, :email
end

# Query the database
user = User.find_by(name: 'John')

# Update the database
user.update(email: '[email protected]')

Using Ruby on Rails and SQLite3 can help developers rapidly create web applications with a robust database backend. It is easy to use and allows developers to quickly create, query, and update database records using object-oriented Ruby code. By following the steps outlined above, developers can quickly connect to an SQLite3 database and use it to power their web applications.