Rails 菜鸟求教：报错 “ActiveRecord::ConnectionNotEstablished”

ghyghoo8 · 2012年01月25日 · 最后由 zhangner 回复于 2012年11月14日 · 8503 次阅读

Started GET "/say/hello" for 127.0.0.1 at 2012-01-25 11:33:35 +0800

ActiveRecord::ConnectionNotEstablished (ActiveRecord::ConnectionNotEstablished):


Rendered C:/Ruby192/lib/ruby/gems/1.9.1/gems/actionpack-3.1.0/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.0ms)
Rendered C:/Ruby192/lib/ruby/gems/1.9.1/gems/actionpack-3.1.0/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (1.0ms)
Rendered C:/Ruby192/lib/ruby/gems/1.9.1/gems/actionpack-3.1.0/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (6.0ms)

网上查了很多答案，都是说数据库未连接什么的，但是，我检查了配置：

development:
  adapter: mysql
  encoding: utf8
  reconnect: false
  database: hw2_development
  pool: 5
  username: root
  password:123
  host: localhost

貌似没什么错误啊，连接正常 sqlite3 也装了。。。。话说，首页http://127.0.0.1:3000请求个图片都请求不了：

Started GET "/assets/rails.png" for 127.0.0.1 at 2012-01-25 11:05:12 +0800
ActiveRecord::ConnectionNotEstablished (ActiveRecord::ConnectionNotEstablished):
......

求高手帮忙解答呀…… 诚心学习 ing

无引用文章

我想问问有多少人在 ROR 连接 mysql 等数据库时有问题啊？

ywencn #1 2012年01月25日

没创建数据库吧，rake db:create

clc3123 #2 2012年01月25日

贴个浏览器中的页面提示上来吧！另外你不会还用 mysql 吧，现在 adapter 好像都用 mysql2 了

*貌似没什么错误啊，连接正常 sqlite3 也装了。。。。 * 你到底用的 sqlite3 还是 mysql 啊老兄。。。

ghyghoo8 #3 2012年01月25日

#2 楼 @clc3123 页面上的错误是这样的：

ActiveRecord::ConnectionNotEstablished

ActiveRecord::ConnectionNotEstablished

Rails.root: D:/ruby/hw2
Application Trace | Framework Trace | Full Trace

activerecord (3.1.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:409:in `retrieve_connection'
activerecord (3.1.0) lib/active_record/connection_adapters/abstract/connection_specification.rb:107:in `retrieve_connection'
activerecord (3.1.0) lib/active_record/connection_adapters/abstract/connection_specification.rb:89:in `connection'
activerecord (3.1.0) lib/active_record/query_cache.rb:65:in `rescue in call'
activerecord (3.1.0) lib/active_record/query_cache.rb:59:in `call'
activerecord (3.1.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:477:in `call'
actionpack (3.1.0) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (3.1.0) lib/active_support/callbacks.rb:392:in `_run_call_callbacks'
activesupport (3.1.0) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.1.0) lib/action_dispatch/middleware/callbacks.rb:28:in `call'
actionpack (3.1.0) lib/action_dispatch/middleware/reloader.rb:68:in `call'
rack (1.3.6) lib/rack/sendfile.rb:101:in `call'
actionpack (3.1.0) lib/action_dispatch/middleware/remote_ip.rb:48:in `call'
actionpack (3.1.0) lib/action_dispatch/middleware/show_exceptions.rb:47:in `call'
railties (3.1.0) lib/rails/rack/logger.rb:13:in `call'
rack (1.3.6) lib/rack/methodoverride.rb:24:in `call'
rack (1.3.6) lib/rack/runtime.rb:17:in `call'
activesupport (3.1.0) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.3.6) lib/rack/lock.rb:15:in `call'
actionpack (3.1.0) lib/action_dispatch/middleware/static.rb:53:in `call'
railties (3.1.0) lib/rails/engine.rb:455:in `call'
railties (3.1.0) lib/rails/rack/content_length.rb:16:in `call'
railties (3.1.0) lib/rails/rack/log_tailer.rb:14:in `call'
rack (1.3.6) lib/rack/handler/webrick.rb:59:in `service'
C:/Ruby192/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service'
C:/Ruby192/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run'
C:/Ruby192/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread'