在Heroku上使用Ruby和XEROUND

Question

首先，我想知道是否有人使用XEROUND插件在Heroku上成功地构建了Rails应用程序？

我的PHP应用程序可以很好地处理XEROUND插件(相同的数据库)。但是，我的Ruby应用程序在启动时出现了错误。我们很抱歉，但出了点问题。

在我的开发机器上，当我运行：

rails server -e production

节目一开始就没问题。

当我将代码推送到Heroku并启动应用程序时，我会得到“对不起”错误。

有什么想法吗？在分配数据库变量之后，是否有输出数据库变量的功能？据我所知，这将意味着修改活动记录适配器。这是Ruby本身的问题吗？它应该已经进入连接池了吗？在Heroku之外使用XEROUND会更好吗？

我的database.yml包含

production:
  adapter: mysql2
  encoding: utf8
  database: <%= ENV['XEROUND_DATABASE_NAME'] %>
  username: <%= ENV['XEROUND_DATABASE_USERNAME'] %>
  password: <%= ENV['XEROUND_DATABASE_PASSWORD'] %>
  host:  <%= ENV['XEROUND_DATABASE_HOST'] %>
  port:  <%= ENV['XEROUND_DATABASE_PORT'] %>

当我硬编码这些值时，我会得到同样的消息。

建立关于Heroku的信息：

git push heroku master
Counting objects: 15, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (10/10), done.
Writing objects: 100% (10/10), 1.19 KiB, done.
Total 10 (delta 7), reused 0 (delta 0)

-----> Heroku receiving push
-----> Ruby/Rails app detected
-----> Installing dependencies using Bundler version 1.2.1
       Running: bundle install --without development:test --path vendor/bundle - -binstubs bin/
       Fetching gem metadata from ....rubygems.org/.........
       Using rake (0.9.2.2)
       Using i18n (0.6.1)
       Using multi_json (1.3.6)
       Using activesupport (3.2.1)
       Using builder (3.0.3)
       Using activemodel (3.2.1)
       Using erubis (2.7.0)
       Using journey (1.0.4)
       Using rack (1.4.1)
       Using rack-cache (1.2)
       Using rack-test (0.6.2)
       Using hike (1.2.1)
       Using tilt (1.3.3)
       Using sprockets (2.1.3)
       Using actionpack (3.2.1)
       Using mime-types (1.19)
       Using polyglot (0.3.3)
       Using treetop (1.4.10)
       Using mail (2.4.4)
       Using actionmailer (3.2.1)
       Using arel (3.0.2)
       Using tzinfo (0.3.33)
       Using activerecord (3.2.1)
       Using mysql2 (0.3.11)
       Using activerecord-mysql2-adapter (0.0.3)
       Using activeresource (3.2.1)
       Using bundler (1.2.1)
       Using coffee-script-source (1.3.3)
       Using execjs (1.4.0)
       Using coffee-script (2.2.0)
       Using rack-ssl (1.3.2)
       Using json (1.7.5)
       Using rdoc (3.12)
       Using thor (0.14.6)
       Using railties (3.2.1)
       Using coffee-rails (3.2.2)
       Using jquery-rails (2.1.3)
       Using rails (3.2.1)
       Using sass (3.2.1)
       Using sass-rails (3.2.5)
       Using uglifier (1.3.0)
       Your bundle is complete! It was installed into ./vendor/bundle
       Cleaning up the bundler cache.
-----> Writing config/database.yml to read from DATABASE_URL
-----> Preparing app for Rails asset pipeline
       Detected manifest.yml, assuming assets were compiled locally
-----> Rails plugin injection
       Injecting rails_log_stdout
       Injecting rails3_serve_static_assets
-----> Discovering process types
       Procfile declares types      -> (none)
       Default types for Ruby/Rails -> console, rake, web, worker
-----> Compiled slug size: 8.7MB
-----> Launching... done, v18
       ....shielded-brushlands-3293.herokuapp.com deployed to Heroku

To git@heroku.com:shielded-brushlands-3293.git
   73c5cb6..c391a47  master -> master

Heroku日志显示：

2012-09-30T00:58:10+00:00 app[web.1]: => Booting WEBrick
2012-09-30T00:58:10+00:00 app[web.1]: => Rails 3.2.1 application starting in production on ...0.0.0.0:6832
2012-09-30T00:58:10+00:00 app[web.1]: => Call with -d to detach
2012-09-30T00:58:10+00:00 app[web.1]: => Ctrl-C to shutdown server
2012-09-30T00:58:10+00:00 app[web.1]: Started GET "/" for 76.87.97.210 at 2012-09-30 00:58:10 +0000
2012-09-30T00:58:15+00:00 heroku[router]: GET shielded-brushlands-3293.herokuapp.com/ dyno=web.1 queue=0 wait=0ms service=4529ms status=500 bytes=643
2012-09-30T00:58:15+00:00 app[web.1]: ActiveRecord::ConnectionNotEstablished (ActiveRecord::ConnectionNotEstablished):
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.1/lib/active_record/connection_adapters/abstract/connection_specification.rb:142:in `connection'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/rack/logger.rb:26:in `call_app'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/cache/strategy/local_cache.rb:72:in `call'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:66:in `call!'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/callbacks.rb:81:in `run_callbacks'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/rack/logger.rb:16:in `call'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/lock.rb:15:in `call'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:51:in `call'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.1/lib/action_dispatch/middleware/callbacks.rb:27:in `call'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/rack/log_tailer.rb:14:in `call'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.1/lib/action_dispatch/middleware/request_id.rb:22:in `call'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.1/lib/action_dispatch/middleware/static.rb:53:in `call'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.1/lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:136:in `forward'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/handler/webrick.rb:59:in `service'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/methodoverride.rb:21:in `call'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.1/lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/runtime.rb:17:in `call'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:245:in `fetch'
2012-09-30T00:58:15+00:00 app[web.1]:   /usr/local/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.1/lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
2012-09-30T00:58:15+00:00 app[web.1]:
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/engine.rb:479:in `call'
2012-09-30T00:58:15+00:00 app[web.1]:   /usr/local/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.1/lib/active_record/query_cache.rb:67:in `rescue in call'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:374:in `retrieve_connection'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/content_length.rb:14:in `call'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:185:in `lookup'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/railties-3.2.1/lib/rails/application.rb:220:in `call'
2012-09-30T00:58:15+00:00 app[web.1]: cache: [GET /] miss
2012-09-30T00:58:15+00:00 app[web.1]:
2012-09-30T00:58:15+00:00 app[web.1]:
2012-09-30T00:58:15+00:00 app[web.1]:   /usr/local/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.1/lib/active_record/connection_adapters/abstract/connection_specification.rb:168:in `retrieve_connection'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.1/lib/active_record/query_cache.rb:61:in `call'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:443:in `call'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.1/lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/callbacks.rb:405:in `_run__2306900267479677068__call__3522025195442796026__callbacks'
2012-09-30T00:58:15+00:00 app[web.1]:   vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.1/lib/active_support/callbacks.rb:405:in `__run_callback'
2012-09-30T00:58:15+00:00 heroku[router]: GET shielded-brushlands-3293.herokuapp.com/favicon.ico dyno=web.1 queue=0 wait=0ms service=17ms status=200 bytes=0
2012-09-30T00:58:15+00:00 app[web.1]: cache: [GET /favicon.ico] miss, store

The gemfile.lock

GEM
  remote: ....rubygems.org/
  specs:
    actionmailer (3.2.1)
      actionpack (= 3.2.1)
      mail (~> 2.4.0)
    actionpack (3.2.1)
      activemodel (= 3.2.1)
      activesupport (= 3.2.1)
      builder (~> 3.0.0)
      erubis (~> 2.7.0)
      journey (~> 1.0.1)
      rack (~> 1.4.0)
      rack-cache (~> 1.1)
      rack-test (~> 0.6.1)
      sprockets (~> 2.1.2)
    activemodel (3.2.1)
      activesupport (= 3.2.1)
      builder (~> 3.0.0)
      activerecord (3.2.1)
      activemodel (= 3.2.1)
      activesupport (= 3.2.1)
      arel (~> 3.0.0)
      tzinfo (~> 0.3.29)
    activerecord-mysql2-adapter (0.0.3)
      mysql2
    activeresource (3.2.1)
      activemodel (= 3.2.1)
      activesupport (= 3.2.1)
    activesupport (3.2.1)
      i18n (~> 0.6)
      multi_json (~> 1.0)
    arel (3.0.2)
    builder (3.0.0)
    coffee-rails (3.2.2)
      coffee-script (>= 2.2.0)
      railties (~> 3.2.0)
    coffee-script (2.2.0)
      coffee-script-source
      execjs
    coffee-script-source (1.3.3)
    erubis (2.7.0)
    execjs (1.4.0)
      multi_json (~> 1.0)
    hike (1.2.1)
    i18n (0.6.0)
    journey (1.0.4)
    jquery-rails (2.1.1)
      railties (>= 3.1.0, < 5.0)
      thor (~> 0.14)
    json (1.7.5)
    mail (2.4.4)
      i18n (>= 0.4.0)
      mime-types (~> 1.16)
      treetop (~> 1.4.8)
    mime-types (1.19)
    multi_json (1.3.6)
    mysql2 (0.3.11)
    polyglot (0.3.3)
    rack (1.4.1)
    rack-cache (1.2)
      rack (>= 0.4)
    rack-ssl (1.3.2)
      rack
    rack-test (0.6.1)
      rack (>= 1.0)
    rails (3.2.1)
      actionmailer (= 3.2.1)
      actionpack (= 3.2.1)
      activerecord (= 3.2.1)
      activeresource (= 3.2.1)
      activesupport (= 3.2.1)
      bundler (~> 1.0)
      railties (= 3.2.1)
    railties (3.2.1)
      actionpack (= 3.2.1)
      activesupport (= 3.2.1)
      rack-ssl (~> 1.3.2)
      rake (>= 0.8.7)
      rdoc (~> 3.4)
      thor (~> 0.14.6)
    rake (0.9.2.2)
    rdoc (3.12)
      json (~> 1.4)
    sass (3.2.1)
    sass-rails (3.2.5)
      railties (~> 3.2.0)
      sass (>= 3.1.10)
      tilt (~> 1.3)
    sprockets (2.1.3)
      hike (~> 1.2)
      rack (~> 1.0)
      tilt (~> 1.1, != 1.3.0)
    thor (0.14.6)
    tilt (1.3.3)
    treetop (1.4.10)
      polyglot
      polyglot (>= 0.3.1)
    tzinfo (0.3.33)
    uglifier (1.2.7)
      execjs (>= 0.3.0)
      multi_json (~> 1.3)

PLATFORMS
  ruby

DEPENDENCIES
  activerecord-mysql2-adapter
  coffee-rails (~> 3.2.1)
  jquery-rails
  mysql2
  rails (= 3.2.1)
  sass-rails (~> 3.2.3)
  uglifier (>= 1.0.3)

Answer 1

我在网上查了一遍:干净利落heroku ruby

列表中的第一项：https://devcenter.heroku.com/articles/xeround

因此，如果我可以使用heroku配置来设置变量，那么我应该能够看到下一次搜索的所有变量: heroku config。

列表中的第一项：https://devcenter.heroku.com/articles/config-vars

在config-vars文章中(来自第二次搜索)，我可以发出命令: heroku config。

heroku config
 !    autoupdate in progress
=== shielded-brushlands-3293 Config Vars
DATABASE_URL:                       postgres://hvsosprakvuedm:v5QU211mYByXbBIdAxa3s4oMff@ec2-107-20-195-105.compute-1.amazonaws.com:5432/dehgili4ph7ih7
GEM_PATH:                           vendor/bundle/ruby/1.9.1
LANG:                               en_US.UTF-8
PATH:                               bin:vendor/bundle/ruby/1.9.1/bin:/usr/local/bin:/usr/bin:/bin
RACK_ENV:                           production
RAILS_ENV:                          production
XEROUND_DATABASE_ADAPTER:           mysql
XEROUND_DATABASE_FAILOVER_ADAPTER:  mysql
XEROUND_DATABASE_FAILOVER_HOST:     instance27464.db.xeround.com.
XEROUND_DATABASE_FAILOVER_NAME:     app7912272
XEROUND_DATABASE_FAILOVER_PASSWORD: xxxxx
XEROUND_DATABASE_FAILOVER_PORT:     16304
XEROUND_DATABASE_FAILOVER_URL:      mysql://app7912272:xxxx@instance27464.db.xeround.com.:16304/app7912272
XEROUND_DATABASE_FAILOVER_USERNAME: app7912272
XEROUND_DATABASE_HOST:              instance27464.db.xeround.com.
XEROUND_DATABASE_INTERNAL_ADAPTER:  mysql
XEROUND_DATABASE_INTERNAL_HOST:     int.instance27464.db.xeround.com.
XEROUND_DATABASE_INTERNAL_NAME:     app7912272
XEROUND_DATABASE_INTERNAL_PASSWORD: xxxxx
XEROUND_DATABASE_INTERNAL_PORT:     16304
XEROUND_DATABASE_INTERNAL_URL:      mysql://app7912272:xxxx@int.instance27464.db.xeround.com.:16304/app7912272
XEROUND_DATABASE_INTERNAL_USERNAME: app7912272
XEROUND_DATABASE_NAME:              app7912272
XEROUND_DATABASE_PASSWORD:          xxxxx
XEROUND_DATABASE_PORT:              16304
XEROUND_DATABASE_URL:               mysql://app7912272:xxxx@instance27464.db.xeround.com.:16304/app7912272
XEROUND_DATABASE_USERNAME:          app7912272

第一个引起了我的注意，它指向了一个postgres的位置。有关系吗？我不是指DATABASE_URL。

这篇(来自第一次搜索的)干净利落的文章包含了一行，但没有解释为什么，它只是说“做吧”。

连接到干涉仪，xeround外接程序将将数据库的URL存储在两个配置vars中: XEROUND_DATABASE_URL和XEROUND_DATABASE_INTERNAL_URL

“内部”URL被转换为内部IP地址，在从同一数据中心访问数据库时应使用该URL。第一个URL用于从外部连接。

复制与您相关的配置变量的值-

$ heroku配置:添加DATABASE_URL=(URL配置vars)

嗯嗯？它不是我在程序中引用的变量，也不是设置在我的本地机器上的变量。

这里是这样的:因为这应该是一个云数据库，所以我不需要知道任何关于数据中心位置的信息，所以使用外部数据库。

heroku config:add DATABASE_URL=mysql://app7912272:xxxx@instance27464.db.xeround.com.:16304/app7912272
Setting config vars and restarting shielded-brushlands-3293...  !
Autoupdate in progress
done, v20
DATABASE_URL: mysql://app7912272:XXXX@instance27464.db.xeround.com.:16304/app7912272

让我们看看它是否出现..。废话

好的，把它设置为内部：

heroku config:add DATABASE_URL=mysql://app7912272:xxxx@int.instance27464.db.xeround.com.:16304/app7912272

让我们看看它是否出现..。垃圾II

我还注意到有两个变量名为XEROUND_DATABASE_ADAPTER、XEROUND_DATABASE_FAILOVER_ADAPTER和XEROUND_DATABASE_INTERNAL_ADAPTER。它们都设置为mysql。我正在使用mysql2。

heroku config:add XEROUND_DATABASE_ADAPTER=mysql2
heroku config:add XEROUND_DATABASE_FAILOVER_ADAPTER=mysql2
herokU config:add XEROUND_DATABASE_INTERNAL_ADAPTER=mysql2

让我们看看它是否出现..。垃圾III

在这篇文章中，更深入的内容是：

Each of the URLs contains a string of the following syntax:

mysql://username:password@host:port/database

The parts out of which the URLs are made of are also set for your convenience in the following environment variables:

XEROUND_DATABASE_ADAPTER
XEROUND_DATABASE_USERNAME
XEROUND_DATABASE_PASSWORD
XEROUND_DATABASE_HOST
XEROUND_DATABASE_PORT
XEROUND_DATABASE_NAME

XEROUND_DATABASE_INTERNAL_ADAPTER
XEROUND_DATABASE_INTERNAL_USERNAME
XEROUND_DATABASE_INTERNAL_PASSWORD
XEROUND_DATABASE_INTERNAL_HOST
XEROUND_DATABASE_INTERNAL_PORT
XEROUND_DATABASE_INTERNAL_NAME

任何有足够长时间参与编程的人，都可能知道这将走向何方。有时候你会做一些事情，即使它们毫无意义。

因此mysql:是从适配器派生的。还更新url变量：

heroku config:add DATABASE_URL=mysql2://app7912272:xxxx@instance27464.db.xeround.com.:16304/app7912272
heroku config:add XEROUND_DATABASE_URL=mysql2://app7912272:xxxxxx@instance27464.db.xeround.com.:16304/app7912272
heroku config:add XEROUND_DATABASE_FAILOVER_URL=mysql2://app7912272:xxxxxx@instance27464.db.xeround.com.:16304/app7912272
herokU config:add XEROUND_DATABASE_INTERNAL_URL=mysql2://app7912272:xxxxxx@instance27464.db.xeround.com.:16304/app7912272

别胡说了，申请出来了

最后看一看：

heroku config
 !    autoupdate in progress
=== shielded-brushlands-3293 Config Vars
DATABASE_URL:                       mysql2://app7912272:xxxx@instance27464.db.xeround.com.:16304/app7912272
GEM_PATH:                           vendor/bundle/ruby/1.9.1
LANG:                               en_US.UTF-8
PATH:                               bin:vendor/bundle/ruby/1.9.1/bin:/usr/local bin:/usr/bin:/bin
RACK_ENV:                           production
RAILS_ENV:                          production
XEROUND_DATABASE_ADAPTER:           mysql2
XEROUND_DATABASE_FAILOVER_ADAPTER:  mysql2
XEROUND_DATABASE_FAILOVER_HOST:     instance27464.db.xeround.com.
XEROUND_DATABASE_FAILOVER_NAME:     app7912272
XEROUND_DATABASE_FAILOVER_PASSWORD: xxxx
XEROUND_DATABASE_FAILOVER_PORT:     16304
XEROUND_DATABASE_FAILOVER_URL:      mysql2://app7912272:xxxx@instance27464.db.xeround.com.:16304/app7912272
XEROUND_DATABASE_FAILOVER_USERNAME: app7912272
XEROUND_DATABASE_HOST:              instance27464.db.xeround.com.
XEROUND_DATABASE_INTERNAL_ADAPTER:  mysql2
XEROUND_DATABASE_INTERNAL_HOST:     int.instance27464.db.xeround.com.
XEROUND_DATABASE_INTERNAL_NAME:     app7912272
XEROUND_DATABASE_INTERNAL_PASSWORD: xxxx
XEROUND_DATABASE_INTERNAL_PORT:     16304
XEROUND_DATABASE_INTERNAL_URL:      mysql2://app7912272:xxxx@instance27464.db.xeround.com.:16304/app7912272
XEROUND_DATABASE_INTERNAL_USERNAME: app7912272
XEROUND_DATABASE_NAME:              app7912272
XEROUND_DATABASE_PASSWORD:          xxxx
XEROUND_DATABASE_PORT:              16304
XEROUND_DATABASE_URL:               mysql2://app7912272:xxxx@instance27464.db.xeround.com.:16304/app7912272
XEROUND_DATABASE_USERNAME:          app7912272

Answer 2

由于mysql2 gem是默认的w/ Rails 3，所以只需确保您的gem文件中有“mysql2”，并运行包安装、提交/推到heroku。

当然，请使用heroku config中"XEROUND_DATABASE_URL“下面列出的URL。

heroku config:add DATABASE_URL=mysql2://app7912272:xxxx@instance27464.db.xeround.com.:16304/app7912272

注意将mysql://更改为mysql 2://(这是关键)

然后

heroku restart

我只是在一个全新的Rails 3.2.9 Heroku应用上成功地运行了Xeround。没有必要将适配器更改为"mysql2“