问题描述:

I'm a Rails developer newbie using MySQL as the database. I can successfully connect to MySQL using the command:

MySQL -u macDaddy -p

at the command prompt, so I know the user is valid and MySQL is running. But when I try to run

rake db:schema:dump

at the command line I get this error:

rake aborted!

Can't connect to MySQL server on 'localhost' (10061)

Is something wrong with my database.yml? Here it is:

 development:

adapter: mysql2

encoding: utf8

reconnect: false

database: bookmobile

pool: 5

username: macDaddy

password: booklover

host: localhost

socket: mysql

port: 3306

I've also tried removing the port and socket lines but I still get the same error. Please help. Here are my versions:

developing on Windows 7

MySQL Ver 14.14 distrib 5.5.21 for win64

Server version 5.5.21

Rails 3.2.1

Thanks!

网友答案:

My best guess is that the machine, which you indicated as Windows, has IPv6 networking enabled. Thus when you try to go to localhost, it is resolving to "::1". This is in fact the local machine, however, default MySQL installs normally have bind-address set to 127.0.0.1, which would cause localhost to fail in this setup.

You might be able to verify this by running ping localhost from the command prompt, and seeing if you get a response like:

 Reply from ::1: time<1ms

To fix this, you can change your config to specify:

 host: 127.0.0.1

Alternately, you can change MySQL's configuration to allow a different bind-address, e.g. localhost instead of 127.0.0.1.

网友答案:

simply change your host to host:127.0.0.1

网友答案:

Change the value of host in the database.yml to be "127.0.0.1" will work. Or,you can modify your pc's hosts file, add an item as "localhost 127.0.0.1".

网友答案:

It's because you don't have password set in your database server(mysql), try this:

development:
  adapter: mysql2
  encoding: utf8
  reconnect: false
  database: bookmobile
  pool: 5
  username: macDaddy
  password:
  host: localhost
  socket: mysql
  port: 3306
网友答案:

I had a similar error but it was because the port: 3306 was missing in the database.yml. Once I added port: 3306 issue was resolved.

网友答案:

make sure the port number that you have set while creating MySQL(e.g.: 7777), please add port number with appropriate 'username' and 'password'.

default: &default
  adapter: mysql2
  encoding: utf8
  pool: 5
  username: root
  password: admin
  host: localhost
  port: 7777

in the database.yml in config directory of your app directory.

网友答案:

Make sure mysql server is running.

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