I've been trying to use mysql and active record on a ruby script but I'm getting the following message: Outdated mysql gem. Upgrade to 2.8.1 or later. In your Gemfile: gem 'mysql', '2.8.1'. Or use gem 'mysql2' (RuntimeError). Before I was getting a message about gem 'mysql2' missing but then i checked the source code on the connection adapters in active record and saw that it require mysql gem which i didnt have installed.
this is my script:
require 'rubygems'
require 'active_record'
require 'mechanize'
require 'nokogiri'
require 'active_record'
require 'mysql2'
gem 'mysql2'
ActiveRecord::Base.establish_connection ({
:adapter => "mysql",
:host => "localhost",
:username => "root",
:password => "",
:database => "rainalytics"})
ActiveRecord::Schema.define(:version => 20110320035328) do
create_table "score_logs", :force => true do |t|
t.integer "blog_posts"
t.integer "featured"
end
create_table "users", :force => true do |t|
t.datetime "created_at"
t.datetime "updated_at"
end
end
class User < ActiveRecord::Base
has_many :score_logs
end
class ScoreLog < ActiveRecord::Base
belongs_to :user
end
Im not using the 'require 'mysql2' or 'gem 'mysql2' parts, and it seems to be working fine, I also have additional {} inside the ActiveRecord::Base block
hope this can help someone in future :)
This is what I use
ruby 1.9.2p318 (2012-02-14 revision 34678) [x86_64-darwin11.2.0]
Rails 3.1.0
require "rubygems"
require "active_record"
ActiveRecord::Base.establish_connection ({
:adapter => "mysql2",
:host => "localhost",
:username => "root",
:password => "root",
:database => "cybercellar"})
class Zone < ActiveRecord::Base
end
zone = Zone.all
print zone
then I navigate to my app folder and run the file
ruby script/test.rb
Related
Hi Im trying to set up a database to store emails using ruby, sinatra, ActiveRecord, and mysql. Any suggestions on what im doing wrong? Im trying to output it to a seperate page that only i can see and then post it using a url on hostgator.
require 'sinatra'
require 'activerecord'
# require 'sinatra-activerecord'
get '/' do
erb :index
end
def save_email (email)
file.print(email)
end
get '/email' do
params[:email]
# # redirect '/'
end
post '/email' do
params[:email]
#email = params[:email]
erb :email, :locals => {:email => params[:email]}
end
# Change the following to reflect your database settings
ActiveRecord::Base.establish_connection(
adapter: 'mysql', # or 'postgresql'
host: 'localhost',
database: 'Stored_Emails',
)
class Stored_Emails < Sinatra::Application
end
class Stored_Emails < ActiveRecord::Base
end
ActiveRecord::Migration.create_table :email do |t|
t.string :emails
end
create_table :emails, force: true do |t|
t.string :email
t.belongs_to :email, index: true
end
get '/email' do
params[:email].all
end
Typically you break out your code into multiple files (we use folders named config, helpers, libraries, views, routes, models, migrations) and require them at the top of your app. However, if you want to put it in the same file and just use that and a Gemfile and Gemfile.lock that'll work too. Here's how it might look:
# Require your gems
require 'sinatra'
require 'activerecord'
# Libraries
# Models
class Stored_Emails < ActiveRecord::Base
end
# Configuration
# Change the following to reflect your database settings
ActiveRecord::Base.establish_connection(
adapter: 'mysql', # or 'postgresql'
host: 'localhost',
database: 'Stored_Emails'
)
ActiveRecord::Migration.create_table :email do |t|
t.string :emails
end
# Migrations
create_table :emails, force: true do |t|
t.string :email
end
# Helpers
def save_email (email)
file.print(email)
end
# Routes
get '/' do
# Load whatever you want to show in your index page into class variables
erb :index
end
get '/email' do
Stored_Emails.all.to_json
end
post '/email' do
#email = Stored_Emails.find_by(params[:email])
erb :email
end
Now you're going to have to do a good bit of work to get this running. Here's what I suggest you read:
1) Sinatra documentation - http://www.sinatrarb.com/intro.html
routes
running your sinatra app
views with ERB
2) Bundler documentation for gems - http://bundler.io/
3) ActiveRecord documentation - http://guides.rubyonrails.org/active_record_basics.html
Connecting to a database Creating your database with a migration -
this is a one time deal Querying the database
Good Luck!
How to properly connect to remote db?
Now i have
def db_params
{:adapter => "mysql2",
:host => "host",
:username => "name",
:password => "pass",
:database => "mydb"}
end
def connect_to_remote_db
ActiveRecord::Base.establish_connection(db_params)
end
When i write connect_to_remote_db it seems ok
I know that remote db has table 'Team'
but when i write Team
in console it returns me uninitialized constant Team
How to handle it properly?
When you call Team ActiveRecord's primary connection is looked up, hence the error.
You could probably wrap that in class.
Since I had dealt with similar situation, you could have that connection in database.ymlitself and use.
development:
adapter: mysql2
other stuff...
db_2:
adapter: mysql2
other stuff..
Then create a class
class Team < ActiveRecord::Base
establish_connection(:db_2)
self.table_name = "teams"
end
from - https://stackoverflow.com/a/26574386/2231236
You need to create model in your application ( of that remote db table) and establish connection. Example:
team.rb
class Team< ActiveRecord::Base
establish_connection "remote_db"
end
If you have multiple table you want to use from that remote db, you can make module and just include it in every model for remote db table.
Module example:
module RemoteConnection
extend ActiveSupport::Concern
included do
establish_connection "remote_db"
end
end
and than
class Team< ActiveRecord::Base
include RemoteConnection
end
Use database.yml file to store connections:
...
remote_db:
:adapter => "mysql2",
:host => "host",
:username => "name",
:password => "pass",
:database => "mydb"
...
I want to add a second read-only database to my application based on a variable aside the SQLite file I'm developing with.
So, there should be three databases.
1. Local SQLite file
2. Production Read-only MySQL database
3. Test Read-only MySQL database
This test database has new columns added and will be pushed as production database soon.
From this SO-Q, I do not understand what the solution is.
I already use establish_connection.
establish_connection(
:adapter => 'mysql2',
:database => "db1",
:username => "username",
:password => "p*ssw*rd",
:host => "ho.st.com"
)
This db1 is the production db without the extra table columns.
db2 is the test db with the extra table columns.
establish_connection(
:adapter => 'mysql2',
:database => "db2",
:username => "username",
:password => "p*ssw*rd",
:host => "ho.st.com"
)
I thought this could be a solution:
In the models of the tables from the MySQL databases:
config = 'test'
case config
when 'test'
establish_connection(
:adapter => 'mysql2',
:database => "db1",
:username => "username",
:password => "p*ssw*rd",
:host => "ho.st.com"
)
else
establish_connection(
:adapter => 'mysql2',
:database => "db2",
:username => "username",
:password => "p*ssw*rd",
:host => "ho.st.com"
)
end
But now I have to edit all 'affected' models when I change the status. Is there a way to variabilise (is that even a word?) this so I only have to edit this config once?
I've tried via Application_controller.rb, but this didn't work.
# Application_controller.rb
def get_config_status
return 'test'
end
# model.rb
config = get_config_status() #=> undefined method `get_config_status' for Regio(Table doesn't exist):Class
# or
config = Application.get_config_status #=> uninitialized constant Regio::Application
Or should I consider totally something else?
To be honest, I don't like putting usernames and passwords in Models. Is this a possible thread for hackers?
Summary
What I'm trying to accomplish is:
Set one variable so my application uses db2 instead of db1.
The octopus gem might be helpful.
https://github.com/tchandy/octopus
You can select the database at query level,
User.where(name: 'Sam').using(:db2)
Or you can select the database per controller action,
class ApplicationController < ActionController::Base
around_filter :select_shard
def select_shard(&block)
Octopus.using(:db1, &block)
end
end
Check out the readme on Github for more examples.
I am using MySQL and ruby 1.8.6. I want to connect to MySQL so for that I am using active record gem. My code is
def initialize
#db_adapter = "mysql2"
#db_host = "localhost"
#db_database = "database_name"
#db_user = "root"
#db_password = "root123"
con = nil
end
def database_connection
con = ActiveRecord::Base.establish_connection(
:adapter => $db_adapter,
:host => $db_host,
:database => $db_database,
:user => $db_user,
:password => $db_password
)
return con
end
but when i am tring to connect it's giving me this error
/usr/lib/ruby/gems/1.8/gems/activerecord-2.3.8/lib/active_record/connection_adapters/abstract/connection_specification.rb:76:in `establish_connection': Please install the adapter: `gem install activerecord--adapter` (no such file to load -- active_record/connection_adapters/_adapter) (RuntimeError)
from /cmf/samnew/build/Controller/databaseConnection.rb:32:in `database_connection'
from controller.rb:23
The error shows the activerecord--adapter gem is not installed. You can install the gem using the command
gem install activerecord--adapter.
Try
con = ActiveRecord::Base.establish_connection(
:adapter => #db_adapter,
:host => #db_host,
:database => #db_database,
:user => #db_user,
:password => #db_password
)
I have a Rails 3.2 app which use PostgreSQL to store all the information.
But in one Rake task I need to make a connection with the MySQL server. I tried to do this:
ActiveRecord::Base.establish_connection(
:adapter => "mysql2",
:database => "foo",
:user => "root",
:password => "",
)
But it just replace my default PostgreSQL connection with this temporary MySQL.
How to make the additional connection for the instance?
I found a very simple solution: to the the vanila mysql2 gem (https://github.com/brianmario/mysql2)
Now my code looks like:
client = Mysql2::Client.new(:host => "localhost", :username => "root", :database => "foobar", :password => "")
users = client.query("SELECT * FROM users")
After that I have an array of results.
Don't establish it on ActiveRecord::Base.
establish_connection connects to a database from a class, as you've discovered, so when you do it on AR:Base, every subclass of that (to whit, the entire database) has the connection established on it, replacing the current one.
Basically, you create a class for each of the tables you want to connect to, and call the establish connection method in those. If you want to do it in several tables, then create a module with it in and include it.
class MyCustomClass < ActiveRecord::Base
establish_connection(
:adapter => "mysql2",
:database => "foo",
:user => "root",
:password => "",
)
end
MyCustomClass.find(1)