Convert a Ruby on Rails app from sqlite to MySQL? - ruby-on-rails

Question

I made an app in Ruby on Rails and now I want to get it hosted. However, they require that I use MySQL and I set it up using sqLite3. Is there any way to convert it to use MySQL?

Answer 1

Step 0
To be safe, I recommend experimenting a bit with this technique in a virtual machine. Save yourself a bunch of heartache and build a virtual machine, check out your code, and have a safe playground that you can throw away if tragedy strikes.
Step 1
Make a backup copy of your database.yml file.
(from your application root)
cp config/database.yml config.database.yml.sqlite3
Step 2
Make a backup copy of your data
For Rails 3, install the YAML DB gem: https://github.com/ludicast/yaml_db
by running
gem install yaml_db
and then add to your Gemfile.
gem 'yaml_db'
For Rails 2.x install the YAML DB plugin:
script/plugin install git://github.com/adamwiggins/yaml_db.git
Run the dump task
rake db:dump
Step 3
Update your config/database.yml file. You will find entries like
development:
adapter: sqlite3
database: db/development.sqlite3
timeout: 5000
test:
adapter: sqlite3
database: db/test.sqlite3
timeout: 5000
production:
adapter: sqlite3
database: db/production.sqlite3
timeout: 5000
Change them to
development:
adapter: mysql
encoding: utf8
reconnect: false
database: **myapp_development**
pool: 5
username: **root**
password: **supersecretpassword**
**socket: /opt/local/var/run/mysql5/mysqld.sock**
test:
adapter: mysql
encoding: utf8
reconnect: false
database: **myapp_test**
pool: 5
username: **root**
password: **supersecretpassword**
socket: **/opt/local/var/run/mysql5/mysqld.sock**
production:
adapter: mysql
encoding: utf8
reconnect: false
database: **myapp_production**
pool: 5
username: **root**
password: **supersecretpassword**
socket: **/opt/local/var/run/mysql5/mysqld.sock**
Be sure to update the values surrounded by asterix as appropriate for your platform! The socket value is only good for Mac OSX using MacPorts. Most flavors of linux do not require this value.
Step 5
If you have some errors in the following step, you might have to install the mysql or mysql2 gem:
sudo gem install mysql
or
sudo gem install mysql2
Have rake create your database
rake db:create
rake db:schema:load
Step 6
Use YamlDb to reload your data into MySql
rake db:load

Answer 2

As long as you have not written any SQL statements that run in sqlLite3 and not MySQL (which you won't have if all your database access is via ActiveRecord and ActiveRecord migrations) then all you need to do is change the database adapter in your database.yml config file.

Answer 3

Check Taps. I've successfully converted a Mysql database to Postgres with it --it should support SQLite.
Edit: Including working link from cony's comment here.

Answer 4

If there's no data to migrate, simply update database.yml and run 'rake db:schema:load' in the new environment. (NOT db:migrate which should only be used for incremental migrations!)

Answer 5

myproject user$ cd
user $ rails new myproject -d mysql
Say 'no' for all question but for Overwrite .../myproject/config/*database.yml*? (enter "h" for help) [Ynaqdh] say 'yes'.