It seems like there are alot of tutorials online for using ruby to interact with mysql. But none of them work for me. Do I not have something installed correctly? Could someone tell me what I am doing wrong? I will try to put down as much relevant information as I can. I am relatively new to ruby (6 months).
This is my Error:
dyld: lazy symbol binding failed: Symbol not found: _mysql_get_client_info
Referenced from: /Library/Ruby/Gems/2.0.0/gems/mysql-2.9.1/lib/mysql/mysql_api.bundle
Expected in: flat namespace
dyld: Symbol not found: _mysql_get_client_info
Referenced from: /Library/Ruby/Gems/2.0.0/gems/mysql-2.9.1/lib/mysql/mysql_api.bundle
Expected in: flat namespace
Trace/BPT trap: 5
This is my sample script:
require 'rubygems'
require 'active_record'
ActiveRecord::Base.establish_connection(
:adapter=> "mysql",
:host => "localhost",
:database=> "#####",
:username => "#####",
:password => "#####"
)
class Rubyist < ActiveRecord::Base
end
Rubyist.create(:name => 'Luc Juggery', :city => "Nashville, Tenessee")
Rubyist.create(:name => 'Sunil Kelkar', :city => "Pune, India")
Rubyist.create(:name => 'Adam Smith', :city => "San Fransisco, USA")
I have the tables created in mysql. I am using the correct username, host, password, and database name. I have a table names Rubyist that has city and name columns.
gem list shows I have activerecord 4.1.1, mysql 2.9.1, mysql2 0.3.16
I have ruby installed ruby -v shows: ruby 2.0.0p451 (2014-02-24 revision 45167) [universal.x86_64-darwin13]
I am using a Mac
Related
I'm trying to create a connection to mysql from ruby script using login path.
I've set the login path in the following way:
mysql_config_editor set --login-path=login-path --host=host-name --user=user --password
Now in my ruby script I have the following line:
require 'mysql2'
$mysql_connection = Mysql2::Client.new(:default_file => '~/.mylogin.cnf',:default_group => 'login-path')
And I get the following error:
error: Found option without preceding group in config file:
/home/user/.mylogin.cnf at line: 3 Fatal error in defaults handling.
Program aborted
When I'm connecting like this, it succeed:
require 'mysql2'
$mysql_connection = Mysql2::Client.new(:host => 'host-name', :username => "user", :password => "password", :database => 'database_name')
What am I doing wrong?
I think the problem is with your 'default_group' setting. I have standard mysql setup using a typical login-path of 'client', eg:
% mysql_config_editor print
[client]
password = *****
and the following connect works with no issue:
#client = Mysql2::Client.new(host: MySQL_Host, username: MySQL_User, default_group: 'client', database: MySQL_Database)
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 have included given code in my db.rb file
require "mysql2" # if needed
#db_host = "localhost"
#db_user = "root"
#db_pass = "root"
#db_name = "farji"
client = Mysql::Client.new(:host => #db_host, :username => #db_user, :password => #db_pass, :database => #db_name)
#cdr_result = client.query("SELECT * from employee')
and in terminal i have install
sudo apt-get install libmysqlclient15-dev
gem install mysql2
and run ruby db.rb it gives me error db.rb:8:in `': uninitialized constant Mysql (NameError)
my ruby version is ruby-2.1.5
Please guide me how to solve this.
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.
script/console output:
>> User.find(:first, :select => '`email`, `pass`, `login`, `id`')
=> #<User pass: "e10adc3949ba59abbe56e057f20f883e", email: "fakemail#bla-bla-bla.com">
>> User.find(:first, :select => '`pass`, `login`, `id`')
=> #<User login: "ostap", pass: "e10adc3949ba59abbe56e057f20f883e">
how i can fix it?
Unix hosting, Ruby 1.8.7, Rails 2.3.5, MySQL 5.1.46
in mysql console all fine...
Try changing ":select => 'pass, login, id'" to :select => 'email, pass, login, id'; i.e. remove the backticks around the fields. I think the backticks in your argument are throwing off the select. Here is the API dock for the find command that lead me to that conclusion.