我从Lynda跟踪 ruby on rails课程,我在使用 Windows命令行连接数据库时遇到问题. 我可以使用“mysql -u username -p”连接到数据库,然后输入密码.我可以创建数据库而且没有问题. 现在执行时：
我可以使用“mysql -u username -p”连接到数据库,然后输入密码.我可以创建数据库而且没有问题.
现在执行时：
rake db:schema:dump
在我的应用程序文件夹“simple_cms”中,我得到以下内容：
rake aborted! Can't connect to MySQL server on 'localhost' (10061) Tasks: TOP => db:schema:dump (See full trace by running task with --trace)
运行跟踪给出：
C:\Users\ASUS\Desktop\simple_cms>rake db:schema:dump --trace ** Invoke db:schema:dump (first_time) ** Invoke environment (first_time) ** Execute environment ** Invoke db:load_config (first_time) ** Execute db:load_config ** Execute db:schema:dump rake aborted! Can't connect to MySQL server on 'localhost' (10061) C:/Ruby192/lib/ruby/gems/1.9.1/gems/mysql2-0.3.11-x86-mingw32/lib/mysql2/client. rb:44:in `connect' C:/Ruby192/lib/ruby/gems/1.9.1/gems/mysql2-0.3.11-x86-mingw32/lib/mysql2/client. rb:44:in `initialize' C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.2.10/lib/active_record/connec tion_adapters/mysql2_adapter.rb:16:in `new' C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.2.10/lib/active_record/connec tion_adapters/mysql2_adapter.rb:16:in `mysql2_connection' C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.2.10/lib/active_record/connec tion_adapters/abstract/connection_pool.rb:315:in `new_connection' C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.2.10/lib/active_record/connec tion_adapters/abstract/connection_pool.rb:325:in `checkout_new_connection' C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.2.10/lib/active_record/connec tion_adapters/abstract/connection_pool.rb:247:in `block (2 levels) in checkout' C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.2.10/lib/active_record/connec tion_adapters/abstract/connection_pool.rb:242:in `loop' C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.2.10/lib/active_record/connec tion_adapters/abstract/connection_pool.rb:242:in `block in checkout' C:/Ruby192/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize' C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.2.10/lib/active_record/connec tion_adapters/abstract/connection_pool.rb:239:in `checkout' C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.2.10/lib/active_record/connec tion_adapters/abstract/connection_pool.rb:102:in `block in connection' C:/Ruby192/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize' C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.2.10/lib/active_record/connec tion_adapters/abstract/connection_pool.rb:101:in `connection' C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.2.10/lib/active_record/connec tion_adapters/abstract/connection_pool.rb:410:in `retrieve_connection' C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.2.10/lib/active_record/connec tion_adapters/abstract/connection_specification.rb:171:in `retrieve_connection' C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.2.10/lib/active_record/connec tion_adapters/abstract/connection_specification.rb:145:in `connection' C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.2.10/lib/active_record/railti es/databases.rake:379:in `block (4 levels) in <top (required)>' C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.2.10/lib/active_record/railti es/databases.rake:378:in `open' C:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.2.10/lib/active_record/railti es/databases.rake:378:in `block (3 levels) in <top (required)>' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/task.rb:228:in `call' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/task.rb:228:in `block i n execute' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/task.rb:223:in `each' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/task.rb:223:in `execute ' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/task.rb:166:in `block i n invoke_with_call_chain' C:/Ruby192/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/task.rb:159:in `invoke_ with_call_chain' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/task.rb:152:in `invoke' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:143:in ` invoke_task' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:101:in ` block (2 levels) in top_level' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:101:in ` each' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:101:in ` block in top_level' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:110:in ` run_with_threads' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:95:in `t op_level' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:73:in `b lock in run' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:160:in ` standard_exception_handling' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:70:in `r un' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-10.0.3/bin/rake:33:in `<top (required)> ' C:/Ruby192/bin/rake:19:in `load' C:/Ruby192/bin/rake:19:in `<main>' Tasks: TOP => db:schema:dump C:\Users\ASUS\Desktop\simple_cms>
现在在我的database.yml文件中,我已经将用户和密码放入并记住将integerpassword放在“”中,冒号和密码之间的空格如下：
# MySQL. Versions 4.1 and 5.0 are recommended. # # Install the MYSQL driver # gem install mysql2 # # Ensure the MySQL gem is defined in your Gemfile # gem 'mysql2' # # And be sure to use new-style password hashing: # http://dev.mysql.com/doc/refman/5.0/en/old-client.html development: adapter: mysql2 encoding: utf8 reconnect: false database: simple_cms_development pool: 5 username: simplelogin password: "1234" host: localhost # Warning: The database defined as "test" will be erased and # re-generated from your development database when you run "rake". # Do not set this db to the same as development or production. test: adapter: mysql2 encoding: utf8 reconnect: false database: simple_cms_test pool: 5 username: root password: host: localhost production: adapter: mysql2 encoding: utf8 reconnect: false database: simple_cms_production pool: 5 username: root password: host: localhost
我甚至尝试用这里描述的ip切换“localhost”(同样的问题)：Rails development – Can’t connect to MySQL server on ‘localhost’ (10061)
但是当我这样做时,我从命令行得到任何消息.
那为什么我不能连接到数据库？
非常感谢任何帮助！谢谢！试图学习ruby和整个安装过程已经耗费了大量的时间……
您应该查找名为my.cnf的文件(如果您在Windows上,则查找my.ini).它可以指定不同的端口或主机.你很幸运能够通过mysql连接到数据库,因为你可以看到你实际连接的位置.
看看你的港口：
mysql> show variables like 'port'; +---------------+-------+ | Variable_name | Value | +---------------+-------+ | port | 3306 | +---------------+-------+ 1 row in set (0.00 sec) mysql> show variables like 'socket'; +---------------+-----------------+ | Variable_name | Value | +---------------+-----------------+ | socket | /tmp/mysql.sock | +---------------+-----------------+ 1 row in set (0.00 sec) mysql> show variables like 'hostname'; +---------------+-------------+ | Variable_name | Value | +---------------+-------------+ | hostname | myhostname | +---------------+-------------+ 1 row in set (0.00 sec)
查看这些值是否与database.yml文件匹配.
获得这些值后,您可以尝试在该端口上进行telnet.如果在该端口上没有任何内容,您将获得以下内容：
$telnet localhost 11111 Trying ::1... telnet: connect to address ::1: Connection refused Trying 127.0.0.1... telnet: connect to address 127.0.0.1: Connection refused Trying fe80::1... telnet: connect to address fe80::1: Connection refused telnet: Unable to connect to remote host
但如果有连接,你会看到一些写有“mysql”的垃圾：
$telnet localhost 3306 Trying ::1... telnet: connect to address ::1: Connection refused Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. J 5.5.28JzKEXl7?5e|bUcq/5\Q^mysql_native_passwordConnection closed by foreign host.
我在Unix上工作,所以你的输出可能看起来不一样.