CODEWITHSUNDEEP
mysqlruby-on-railsruby
Alve
Alve

Reputation: 1465

How can I query a MySQL database from a Rails app without models?

How can I execute a SQL query from a Rails application to a MySQL database?

My application uses Postgres as a primary database, but I need to read some information from a secondary MySQL database. I can't create models because the MySQL database has more than 100 tables, named in an incompatible way for every table. Can it be done without ActiveRecord or some other way?

Upvotes: 8

Views: 3634

Answers (1)

Arun Kumar Arjunan
Arun Kumar Arjunan

Reputation: 6857

You can use mysql2 gem directly. Read the documentation here: https://github.com/brianmario/mysql2

Or:

You can create a new class like MysqlConnection like this:

class MysqlConnection < ActiveRecord::Base
  self.establish_connection(:adapter => 'mysql', :database => 'some-database-name') # Set all the other required params like host, user-name, etc
end

From now on, you can do,

MysqlConnection.connection.select_all("SELECT * FROM table_name")

Follow the link to understand how to store the configuration details in database.yml: http://weare.buildingsky.net/2006/12/06/multiple-concurrent-database-connections-with-activerecord

Upvotes: 13

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