rake db：用mysql2 gem创建错误（无法为{“adapter”=>“mysql2”创建数据库）
[英]rake db:create error with mysql2 gem (Couldn't create database for {“adapter”=>“mysql2”)
问题描述
I'm trying to get rails 4 up and running together with ruby 2.0 on my debian 7 box and I'm having issues connecting to a mysql database with mysql2 gem. 
我正试图在我的debian 7盒子上使用ruby 2.0和rails 4一起运行，并且我在使用mysql2 gem连接到mysql数据库时遇到问题。
I have used the commands below to set up the everything around: 我使用下面的命令来设置周围的一切：
\curl -L https://get.rvm.io | bash -s stable rvm install ruby rvm use ruby --default rvm rubygems current gem install rails --no-ri --no-rdoc
When I try to run rake db:create and I'm getting the follow error: 当我尝试运行rake db：create时，我收到了以下错误：
no implicit conversion of Fixnum into String
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/mysql2-0.3.13/lib/mysql2/client.rb:58:in `connect'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/mysql2-0.3.13/lib/mysql2/client.rb:58:in `initialize'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/mysql2_adapter.rb:18:in `new'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/mysql2_adapter.rb:18:in `mysql2_connection'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:440:in `new_connection'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:450:in `checkout_new_connection'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:421:in `acquire_connection'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:356:in `block in checkout'
/home/mayrun/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/monitor.rb:211:in `mon_synchronize'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:355:in `checkout'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:265:in `block in connection'
/home/mayrun/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/monitor.rb:211:in `mon_synchronize'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:264:in `connection'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:546:in `retrieve_connection'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_handling.rb:79:in `retrieve_connection'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_handling.rb:53:in `connection'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/tasks/mysql_database_tasks.rb:8:in `connection'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/tasks/mysql_database_tasks.rb:16:in `create'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/tasks/database_tasks.rb:72:in `create'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/tasks/database_tasks.rb:86:in `block in create_current'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/tasks/database_tasks.rb:182:in `block in each_current_configuration'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/tasks/database_tasks.rb:181:in `each'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/tasks/database_tasks.rb:181:in `each_current_configuration'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/tasks/database_tasks.rb:85:in `create_current'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/railties/databases.rake:20:in `block (2 levels) in '
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/task.rb:236:in `call'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/task.rb:236:in `block in execute'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/task.rb:231:in `each'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/task.rb:231:in `execute'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/task.rb:175:in `block in invoke_with_call_chain'
/home/mayrun/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/monitor.rb:211:in `mon_synchronize'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/task.rb:168:in `invoke_with_call_chain'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/task.rb:161:in `invoke'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:149:in `invoke_task'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:106:in `block (2 levels) in top_level'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:106:in `each'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:106:in `block in top_level'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:115:in `run_with_threads'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:100:in `top_level'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:78:in `block in run'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:165:in `standard_exception_handling'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:75:in `run'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/bin/rake:33:in `'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/bin/rake:23:in `load'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/bin/rake:23:in `'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/bin/ruby_executable_hooks:15:in `eval'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/bin/ruby_executable_hooks:15:in `'
Couldn't create database for {"adapter"=>"mysql2", "encoding"=>"utf8", "database"=>"myapp_development", "pool"=>5, "username"=>"dev", "password"=>password, "socket"=>"/var/run/mysqld/mysqld.sock"}
no implicit conversion of Fixnum into String
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/mysql2-0.3.13/lib/mysql2/client.rb:58:in `connect'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/mysql2-0.3.13/lib/mysql2/client.rb:58:in `initialize'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/mysql2_adapter.rb:18:in `new'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/mysql2_adapter.rb:18:in `mysql2_connection'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:440:in `new_connection'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:450:in `checkout_new_connection'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:421:in `acquire_connection'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:356:in `block in checkout'
/home/mayrun/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/monitor.rb:211:in `mon_synchronize'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:355:in `checkout'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:265:in `block in connection'
/home/mayrun/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/monitor.rb:211:in `mon_synchronize'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:264:in `connection'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:546:in `retrieve_connection'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_handling.rb:79:in `retrieve_connection'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/connection_handling.rb:53:in `connection'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/tasks/mysql_database_tasks.rb:8:in `connection'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/tasks/mysql_database_tasks.rb:16:in `create'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/tasks/database_tasks.rb:72:in `create'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/tasks/database_tasks.rb:86:in `block in create_current'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/tasks/database_tasks.rb:182:in `block in each_current_configuration'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/tasks/database_tasks.rb:181:in `each'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/tasks/database_tasks.rb:181:in `each_current_configuration'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/tasks/database_tasks.rb:85:in `create_current'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.0.0/lib/active_record/railties/databases.rake:20:in `block (2 levels) in '
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/task.rb:236:in `call'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/task.rb:236:in `block in execute'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/task.rb:231:in `each'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/task.rb:231:in `execute'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/task.rb:175:in `block in invoke_with_call_chain'
/home/mayrun/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/monitor.rb:211:in `mon_synchronize'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/task.rb:168:in `invoke_with_call_chain'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/task.rb:161:in `invoke'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:149:in `invoke_task'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:106:in `block (2 levels) in top_level'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:106:in `each'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:106:in `block in top_level'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:115:in `run_with_threads'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:100:in `top_level'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:78:in `block in run'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:165:in `standard_exception_handling'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/lib/rake/application.rb:75:in `run'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/gems/rake-10.1.0/bin/rake:33:in `'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/bin/rake:23:in `load'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247@global/bin/rake:23:in `'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/bin/ruby_executable_hooks:15:in `eval'
/home/mayrun/.rvm/gems/ruby-2.0.0-p247/bin/ruby_executable_hooks:15:in `'
Couldn't create database for {"adapter"=>"mysql2", "encoding"=>"utf8", "database"=>"myapp_test", "pool"=>5, "username"=>"dev", "password"=>password, "socket"=>"/var/run/mysqld/mysqld.sock"}
My inspections after having a deep look: 深入了解我的检查：
- mysql is up and running mysql启动并运行
- mysql username and password are correct. mysql的用户名和密码都是正确的。
- mysql is listening to localhost and 127.0.0.1 mysql正在侦听localhost和127.0.0.1
- /var/run/mysqld/mysqld.sock file exists /var/run/mysqld/mysqld.sock文件存在
- I looked at the mysql logs and it seem slike mysql2 is not even attempting to connect. 我查看了mysql日志，看起来很像mysql2甚至没有尝试连接。
- when replacing mysql2 gem with the older, slower mysql gem, the problem goes away. 当用较旧的，较慢的mysql gem替换mysql2 gem时，问题就消失了。
My mysql version: 我的mysql版本：
$ mysql --version
mysql Ver 14.14 Distrib 5.5.31, for debian-linux-gnu (x86_64) using readline 6.2
This is my database/config.yml file: 这是我的database / config.yml文件：
development:
adapter: mysql2
encoding: utf8
database: myapp_development
pool: 5
username: dev
password: password
host: localhost
socket: /var/run/mysqld/mysqld.sock
test:
adapter: mysql2
encoding: utf8
database: myapp_test
pool: 5
username: dev
password: password
socket: /var/run/mysqld/mysqld.sock
production:
adapter: mysql2
encoding: utf8
database: myapp_production
pool: 5
username: dev
password: password
socket: /var/run/mysqld/mysqld.sock
Local gem list: 本地宝石清单：
*** LOCAL GEMS *** actionmailer (4.0.0) actionpack (4.0.0) activemodel (4.0.0) activerecord (4.0.0) activerecord-deprecated_finders (1.0.3) activesupport (4.0.0) arel (4.0.1) atomic (1.1.14) builder (3.1.4) bundler (1.3.5) bundler-unload (1.0.2) coffee-rails (4.0.1) coffee-script (2.2.0) coffee-script-source (1.6.3) erubis (2.7.0) execjs (2.0.2) executable-hooks (1.2.6) hike (1.2.3) i18n (0.6.5) jbuilder (1.5.2) jquery-rails (3.0.4) json (1.8.1) mail (2.5.4) mime-types (1.25) minitest (4.7.5) multi_json (1.8.2) mysql2 (0.3.13) polyglot (0.3.3) rack (1.5.2) rack-test (0.6.2) rails (4.0.0) railties (4.0.0) rake (10.1.0) rdoc (3.12.2) rubygems-bundler (1.4.1) rvm (1.11.3.8) sass (3.2.12) sass-rails (4.0.1) sdoc (0.3.20) sprockets (2.10.0) sprockets-rails (2.0.1) thor (0.18.1) thread_safe (0.1.3) tilt (1.4.1) treetop (1.4.15) turbolinks (1.3.0) tzinfo (0.3.38) uglifier (2.3.0)
Packages installed: 安装包：
$ sudo dpkg -l | grep mysql
ii libdbd-mysql-perl 4.021-1+b1 amd64 Perl5 database interface to the MySQL database
ii libmysqlclient-dev 5.5.31+dfsg-0+wheezy1 amd64 MySQL database development files
ii libmysqlclient18:amd64 5.5.31+dfsg-0+wheezy1 amd64 MySQL database client library
ii mysql-client 5.5.31+dfsg-0+wheezy1 all MySQL database client (metapackage depending on the latest version)
ii mysql-client-5.5 5.5.31+dfsg-0+wheezy1 amd64 MySQL database client binaries
ii mysql-common 5.5.31+dfsg-0+wheezy1 all MySQL database common files, e.g. /etc/mysql/my.cnf
ii mysql-server 5.5.31+dfsg-0+wheezy1 all MySQL database server (metapackage depending on the latest version)
ii mysql-server-5.5 5.5.31+dfsg-0+wheezy1 amd64 MySQL database server binaries and system database setup
ii mysql-server-core-5.5 5.5.31+dfsg-0+wheezy1 amd64 MySQL database server binaries
ii php5-mysql 5.4.4-14+deb7u5 amd64 MySQL module for php5
2 个解决方案
解决方案1
8 2014-05-07 07:39:15
对于每个人仍然挣扎，记得在一个单独的终端运行mysqld 。
解决方案2
1 2014-10-15 12:49:48
请确保你的mysql.sock在ubuntu 14.04中是正确的，它位于/var/run/mysqld/mysqld.sock
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