I'm trying to connect to a SQL server in a domain, but I don't know why I have an error.
My environnement is Ubuntu 14.04, and I use mysql2.
I think my problem is :server="myServer" but I have to specify what server.
My request is :
db = Mysql2::Client.new(:host => "xxx.xxx.xxx.xxx",:server="myServer" ,:username => "myname", :password => "SECRET", :port => 3306, :database => "test" )
which gives me this error: Mysql2::error (111)
This request is working:
db = Mysql2::Client.new(:host => "192.168.1.1", :username => "root", :password => "SECRET", :port => 3306, :database => "test" )
Take a look at this:
Can't connect to MySQL server error 111
Probably you are facing the same issue.
Related
I want to connect to CakePHP3.77 with MySQL 5.7.25 in MAMP.
I cannot connect with database named cake_youtube_db.
Error Message is this.
CakePHP is NOT able to connect to the database.
Connection to database could not be established: SQLSTATE[HY000] [2054] The server requested authentication method unknown to the client
I did try create other users and put user and password.
However they did not work.
/config/app.php
'Datasources' => [
'default' => [
'className' => 'Cake\Database\Connection',
'driver' => 'Cake\Database\Driver\Mysql',
'persistent' => false,
'host' => 'localhost',
//'port' => 'non_standard_port_number',
'username' => 'root',
'password' => 'root',
'database' => 'cake_youtube_db',
SQL plugin is mysql_native_password.
I expect Database will be connected with my cakeapp.
I am trying to connect to a different Database (php_db) from a rails app.
currently App has mysql Database(ror_db). Both Databases are on the same server.
I have some requirement ,where i have to insert some records from rails app to php_db.
I have used below code to do that.
Not sure how far it is secure.
ActiveRecord::Base.establish_connection(
:adapter => "mysql",
:host => "localhost",
:username => "xxxxxx",
:password => "xxxxxx",
:database => "php_db"
)
sql_update = "INSERT INTO cxv_journal(trans_no, reference,tran_date,event_date,doc_date) VALUES (2,2,'xxxx-xx-xx','xxxx-xx-xx','xxxx-xx-xx')"
ActiveRecord::Base.connection.execute(sql_update)
ActiveRecord::Base.remove_connection
config =YAML.load_file(File.join(Rails.root,"config","database.yml"))
ActiveRecord::Base.establish_connection(config['production'])
Appreciate any suggestion for more optimized solution.
Thanks in advance.
I need to create a rake task that gets the table rows from a MySQL database, parse the data, and insert into an Oracle database. The databases are on two different hosts.
My current attempt:
namespace :import_from_mysql do
class MySQLConnection < ActiveRecord::Base
self.abstract_class = true
establish_connection({
:adapter => 'mysql',
:host => 'xxx.xxx.com',
:database => 'sample_database',
:username => 'username',
:password => 'password'
})
end
class MySQLTable < MySQLConnection
self.table_name = "users"
self.primary_key = "id"
self.inheritance_column = "something_unique_here"
end
desc "Parse data before inserting to oracle database"
task :insert_to_oracle => :environment do |t|
puts "Rake task has begun...\n\n"
puts "Parsing data from MYSQL...\n\n"
MySQLTable.establish_connection
puts "Rake task has completed!"
end
end
But the MySQLTable.establish_connection establishes a connection to my local database which is sqlite even though I'm trying to connect to a mysql_adapter.
When I tried to establish a connection using the command below, I was able to connect to a MySQL adapter but I don't know how I can access my tables after the connection was established:
ActiveRecord::Base.establish_connection({:adapter => "mysql", :database => "sample_database", :host => "xxx.xxx.com", :username => "username", :password => "password" })
Any idea on why it keeps on connecting to sqlite? And after successfully establishing a connection to mysql, how do I select table rows after the MySQLTable.establish_connection statement?
With the connection generated using ActiveRecord::Base you can execute SQL statements against whatever database you connect to. Like so:
connection = ActiveRecord::Base.establish_connection(
:adapter => "mysql",
:host => "faraway",
:username => "myuser",
:password => "mypass",
:database => "somedatabase"
)
connection.execute('SELECT * FROM users')
Once established, the connection can also be referenced from ActiveRecord::Base class.
ActiveRecord::Base.establish_connection(...)
ActiveRecord::Base.connection.execute(...)
You can use mysql2 gem (https://github.com/brianmario/mysql2) inside your rake task.
client = Mysql2::Client.new(:host => "localhost", :username => "username", :database => "sample_database", :password => "password")
users = client.query("SELECT * FROM users")
Thought it might be helpful for someone else. The following worked for me!
connection = ActiveRecord::Base.establish_connection(
:adapter => "mysql",
:host => "faraway",
:username => "myuser",
:password => "mypass",
:database => "somedatabase"
)
#connection = ActiveRecord::Base.connection
result = #connection.exec_query('SELECT * FROM users')
result.each do |row|
puts row
end
Here, users is an already existing table in the "somedatabase".
although I am a noob with connections and "database back office" my trivial approach works like a charm, and there is no need with parameters in rake task that is for updating "domain tables" that contain only defining data like legal or help texts:
pre_db = ActiveRecord::Base.establish_connection('preproduction').connection
prod_db = ActiveRecord::Base.establish_connection('online').connection
and in database.yml I defined the databases. ("preproduction" is a step between dev and prod in my case and a real environment like "development". where 'online' is almost the same as 'production' (I made a different entry only for security reasons - not to destroy production if database.yml gets uploaded)
I'm dealing with this a few days, and cannot connect to a simple mysql database on localhost.
require "mysql"
#db_host = "localhost"
#db_user = "myrubyapp"
#db_pass = "1234"
#db_name = "myrubyapp"
mysql = Mysql.new(:host => #db_host, :username => #db_user, :password => #db_pass, :database => #db_name)
The output I got is an error: can't convert Hash into String (TypeError) where Mysql.new is.
The second one, I tried to change the gem to mysql2
require "mysql2"
#db_host = "localhost"
#db_user = "myrubyapp"
#db_pass = "1234"
#db_name = "myrubyapp"
mysql = Mysql2.new(:host => #db_host, :username => #db_user, :password => #db_pass, :database => #db_name)
The output is an error too, but is different from the first: undefined method "new" for Mysql2:Module (NoMethodError).
Guys I'm sorry that I have to ask this kind of questions, but I'm really really confused, I have an experience of programming more than 3 years in JavaSE and EE, I am ashamed cause I can't deal with that. Please point me into right direction and don't judge me harshly. I am new to Ruby.
Try
mysql = Mysql2::Client.new(:host => #db_host, :username => #db_user, :password => #db_pass, :database => #db_name)
correct syntax is:
client = Mysql2::Client.new(:host => "localhost", :username => "root")
see mysql2 on github for more examples
I recomment you to take a look at Sequel as raw mysql2 lib provide a very limited functionality and Sequel can do a lot.
Never used the gem mysql, but have you tried to remove the hash :host => etc and pass directly a list of parameters?
Something like con = Mysql.new db_host, db_user, db_pass, db_name
http://zetcode.com/db/mysqlrubytutorial/ for a tutorial
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)