当类型“rake db:migrate”得到错误的文件描述符时出错

Question

我在迁移 Mysql 和 Rails 时遇到了一些麻烦

信息---------------

MySQL Server 5.5（我试过 MySQL Server 5.1，但不行）
红宝石 1.9.3-p429
Rails 3.2

---

我已经用过了

"gem 安装 mysql2 -v 0.2.6"
“gem 安装 mysql”

并添加到 gemfile

宝石'mysql'
gem 'mysql2','>=0.2.6'

将数据库迁移到 MySQL 时出现错误
键入“rake db:migrate”
得到错误的文件描述符

C:\Sites\demo> rake db:migrate
rake 中止！
错误的文件描述符
任务：TOP => db:migrate
（通过使用 --trace 运行任务查看完整跟踪）

细节

C:\Sites\demo> rake db:migrate --trace
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
** Invoke db:load_config (first_time)
** Execute db:load_config
** Execute db:migrate
rake aborted!
Bad file descriptor
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/mysql2-0.2.6-x86-mi
ngw32/lib/active_record/connection_adapters/mysql2_adapter.rb:312:in `query'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/mysql2-0.2.6-x86-mi
ngw32/lib/active_record/connection_adapters/mysql2_adapter.rb:312:in `execute'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/mysql2-0.2.6-x86-mi
ngw32/lib/active_record/connection_adapters/mysql2_adapter.rb:629:in `configure_
connection'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/mysql2-0.2.6-x86-mi
ngw32/lib/active_record/connection_adapters/mysql2_adapter.rb:169:in `initialize
'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/mysql2-0.2.6-x86-mi
ngw32/lib/active_record/connection_adapters/mysql2_adapter.rb:16:in `new'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/mysql2-0.2.6-x86-mi
ngw32/lib/active_record/connection_adapters/mysql2_adapter.rb:16:in `mysql2_conn
ection'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.0/
lib/active_record/connection_adapters/abstract/connection_pool.rb:440:in `new_co
nnection'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.0/
lib/active_record/connection_adapters/abstract/connection_pool.rb:450:in `checko
ut_new_connection'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.0/
lib/active_record/connection_adapters/abstract/connection_pool.rb:421:in `acquir
e_connection'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.0/
lib/active_record/connection_adapters/abstract/connection_pool.rb:356:in `block
in checkout'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchr
onize'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.0/
lib/active_record/connection_adapters/abstract/connection_pool.rb:355:in `checko
ut'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.0/
lib/active_record/connection_adapters/abstract/connection_pool.rb:265:in `block
in connection'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchr
onize'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.0/
lib/active_record/connection_adapters/abstract/connection_pool.rb:264:in `connec
tion'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.0/
lib/active_record/connection_adapters/abstract/connection_pool.rb:546:in `retrie
ve_connection'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.0/
lib/active_record/connection_handling.rb:79:in `retrieve_connection'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.0/
lib/active_record/connection_handling.rb:53:in `connection'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.0/
lib/active_record/migration.rb:863:in `initialize'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.0/
lib/active_record/migration.rb:764:in `new'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.0/
lib/active_record/migration.rb:764:in `up'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.0/
lib/active_record/migration.rb:742:in `migrate'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.0/
lib/active_record/railties/databases.rake:42:in `block (2 levels) in <top (requi
red)>'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rak
e/task.rb:236:in `call'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rak
e/task.rb:236:in `block in execute'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rak
e/task.rb:231:in `each'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rak
e/task.rb:231:in `execute'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rak
e/task.rb:175:in `block in invoke_with_call_chain'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchr
onize'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rak
e/task.rb:168:in `invoke_with_call_chain'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rak
e/task.rb:161:in `invoke'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rak
e/application.rb:149:in `invoke_task'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rak
e/application.rb:106:in `block (2 levels) in top_level'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rak
e/application.rb:106:in `each'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rak
e/application.rb:106:in `block in top_level'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rak
e/application.rb:115:in `run_with_threads'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rak
e/application.rb:100:in `top_level'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rak
e/application.rb:78:in `block in run'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rak
e/application.rb:165:in `standard_exception_handling'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.1.0/lib/rak
e/application.rb:75:in `run'
D:/AppServ/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.1.0/bin/rak
e:33:in `<top (required)>'
D:/AppServ/RailsInstaller/Ruby1.9.3/bin/rake:23:in `load'
D:/AppServ/RailsInstaller/Ruby1.9.3/bin/rake:23:in `<main>'
Tasks: TOP => db:migrate

我已经修改了“database.yml”

development:
  adapter: mysql2
  encoding: utf8
  database: demo_development
  host: 127.0.0.1
  username: 'root'
  password: '1234'
  port: 3306

test:
  adapter: mysql2
  encoding: utf8
  database: demo_test
  host: 127.0.0.1
  username: 'root'
  password: '1234'
  port: 3306

production:
  adapter: mysql2
  encoding: utf8
  database: demo_production
  host: 127.0.0.1
  username: 'root'
  password: '1234'

希望有人可以帮助我
我有几天的库存了
谢谢！

Answer 1

尝试从 gemfile 中删除“mysql”gem，只需要“mysql2”，删除后执行捆绑安装。

来自github上mysql的文档

要使用 Active Record 驱动程序（带或不带导轨），所有你 应该需要做的是安装这个gem并将适配器设置在 你的 database.yml 到“mysql2”。那很容易吧？ :)

注意：从 0.3.0 开始，以及 Active Record 3.1 - Active Record 适配器 已经从这个 gem 中提取出来并进入 Active Record 本身。如果你 需要使用 mysql2 和 Rails 版本 0.2.7"

在 windows 中安装问题也可以参考这里

Rails installation windows 7 bad file descriptor mysql2