mysql2

问题 Edit: While trying to get this working, I commented out the offending factory_girl entirely - and it's still giving the same error - cannot load such file -- factory_girl_rails /app/lib/tasks/sample_data.rake:1:in require' is there something i need to do to make heroku work with/see my updated files? OP: heroku open returns We're sorry, but something went wrong. in the browser and the following from heroku logs : 2013-08-23T21:18:48.870042+00:00 app[web.1]: Started GET "/" for 86.59.188.18 at

问题 I am attempting to create a prepared insert statement in Sequel and I am as far as db[:registration].prepare(:insert) => <Sequel::Mysql2::Dataset/PreparedStatement "INSERT INTO `registration` () VALUES ()"> How do I create a statement that is something like the following: INSERT INTO `registration` (`name`, `email`) VALUES (?, ?) The documentation is a little bit obtuse and I can't find any examples online. 回答1: Figured this out looking at their rspecs: statement = db[:registration].prepare(

问题 I'm upgrading from Rails 3.2.14 to Rails 4. When running RSpec on my test suite in my Rails 3 branch, all tests pass. On the Rails 4 branch, however, I'm getting an error on the first instance only of creating a factory. The error reads: ActiveRecord::StatementInvalid: Mysql2::Error: Field 'id' doesn't have a default value: INSERT INTO `of_of_measurements` (`aerobic_steps`, `calories`, `date`, `device_serial`, `distance`, `is_device_input`, `server_time`, `total_steps`, `user_id`) VALUES (15,

问题 Windows XP with installed MYSQL as a development machine, ruby 1.9.2p290 (2011-07-09) [i386-mingw32], Rails 3.1.0 gem install mysql2 -- '--with-mysql-lib="c:\Program Files\MySQL\MySQL S erver 5.5\lib" --with-mysql-include="c:\Program Files\MySQL\MySQL Server 5.5\inc lude"' (successfully installed gem mysql2) rails new talk -d mysql (successfully created a new rails app called talk) PROBLEM NOW STARTS: C:\Sites\RP\talk>rails generate User ERROR MESSAGE: ruby.exe-Unable to Locate Component This

问题 In Sequel Pro, created a table using this statement: CREATE TABLE dogs( id INT PRIMARY KEY AUTO_INCREMENT, name TEXT, color TEXT ); Since the id value is being created by MySQL, I would like to set/create/maintain the id field in ruby so that puts dog.id will not be an empty string. Was wondering if this piece of code would accomplish that: def new_from_hash(hash) Dog.new(hash["name"], hash["color"]).tap {|dog| dog.id = hash["id"]} end NOTE: I am not running rails; just plain ruby, the gem

问题 I switched to mysql dtabase in Rails.I got a databse.sql file generated in db folder.But when i login to mysql and check data in tables then there is no records present in tables. i used this command for dump mysql –u root –p database_name < database_name.sql there was no error while executing this command but when i checked the tables then there were no records in the tables.So please help me to insert all my records in database using database.sql file.There is one fiel generated database.sq

问题 I installed mysql2 gem using command: gem install mysql2 Done installing documentation for mysql2 after 0 seconds 1 gem installed But when I do require 'mysql2' , I get: LoadError: cannot load such file -- mysql2/mysql2 Even though the gem installed successfully, gem list mysql2 *** LOCAL GEMS *** mysql2 (0.4.0) I am using MacOSX with ruby 2.1.5p273 Any suggestions as to where should I be looking ? 回答1: Are you sure you have quoted gem name like this require 'mysql2' ? Please, show your

问题 This problem began as the commonly-seen “incompatible character encodings: ASCII-8BIT and UTF-8” problem, but that is not what I'm asking. Rather, I discovered that this problem was happening because certain fields of my database are being tagged as ASCII-8BIT when they're retrieved, while most are correctly shown as UTF-8. For example, in a table with columns country and nationality , where both columns in row 16 have identical values (copied-and-pasted), I get irb(main):003:0> c = Country

问题 I've read through numerous posts here regarding mysql2, but although the gem seems to install fine, I still get error when running any rake db tasks or rails commands. In my Gemfile: source 'http://rubygems.org' gem 'rails', '3.0.7' gem 'mysql2' On my remote server I ran the following: $ bundle install ... Using mysql2 (0.2.7) ... Using rails (3.0.7) ... Your bundle is complete! Use `bundle show [gemname]` to see where a bundled gem is installed. $ rake db:schema:load (in ...) rake aborted!

问题 I'm using the MySQL2 Ruby driver - but it seems a bit redundant having to call result.each{ |r| puts r['name'] } for a single row of data that is returned. There must be a simpler way to get the mysql field I want without having to use the each block? 回答1: Your result should be a Mysql2::Result and that's Enumerable so you can use first (and the rest of the Enumerable goodies) on it: puts result.first['name'] 来源： https://stackoverflow.com/questions/14064649/ruby-mysql-fetching-single-row-but