Question

我尝试在我的应用上运行db：migrate并且我收到此错误。不确定原因是什么。

我的数据库是MySQL
使用MySQL 64位连接器
ruby版本：ruby 2.2.6p396（2016-11-15修订版56800）[i386-mingw32] 我已经完成了谷歌搜索，但我没有得到任何东西。任何人都可以解释这个错误吗？

NotImplementedError：NotImplementedError C：/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-5.0.1/lib/active_record/connection_adapters/abstract/database_statements.rb:85:in exec_query' C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-5.0.1/lib/active_record/connection_adapters/abstract/database_statements.rb:377:in 'select_prepared' C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-5.0.1/lib/active_record/connection_adapters/abstract/database_statements.rb:39:in select_all＆＃39 ; C：/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-5.0.1/lib/active_record/connection_adapters/abstract/query_cache.rb:95:in select_all' C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-5.0.1/lib/active_record/querying.rb:39:in find_by_sql＆＃39 ; C：/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-5.0.1/lib/active_record/relation.rb:702：在`exec_queries＆＃39;

C：/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/rake-12.0.0/exe/rake:27:in <top (required)>' C:/RailsInstaller/Ruby2.2.0/bin/rake:23:in loading＆＃39; C：/RailsInstaller/Ruby2.2.0/bin/rake:23：在'＆＃39; 任务：TOP =＆gt;分贝：

迁移

Answer 1

你可以试试这个..

检查您的config/database.yml文件。

config/database.yml必须与username相似，password应更改mysql username，password。

default: &default
  adapter: mysql2
  encoding: utf8
  pool: 5
  username: username
  password: password
  socket: /var/run/mysqld/mysqld.sock

development:
  <<: *default
  database: uBuild-rails_development

test:
  <<: *default
  database: uBuild-rails_test


production:
  <<: *default
  database: uBuild-rails_development
  username: username
  password: password

同时检查Gemfile

gem 'mysql2', '< 0.3' # as stated above

Answer 2

我遇到了同样的问题，我所做的是使用此命令再次创建项目：

rails new my_project -d=mysql

这样就可以自动创建database.yml和gemfile中的配置，避免出现问题。您只需编辑database.yml mysql密码即可使用

rails g scaffold Examples attrib1:string attrib2:string

创建视图等

 rake db:create

创建数据库然后

rake db:migrate

希望这会有所帮助...

Answer 3

数据库文件位于config / database.yml中，配置为

default: &default
  adapter: mysql2 #if use postgres the add postgresql
  pool: 5
  timeout: 5000
  username : username #mysql username
  password : password #mysql password

development:
  <<: *default
  database: application_name

test:
  <<: *default
  database: application_name

production:
  <<: *default
  database: application_name

运行以下命令来设置数据库：

run rake db:create

run rake db:migrate

Mysql连接适配器错误

3 个答案: