Question

尝试运行rake db:create或rake db:setup时收到此错误消息：

Couldn't create database for {"adapter"=>"mysql2", "host"=>"localhost", "database"=>"mydb_dev"}, {:charset=>"utf8", :collation=>"utf8_unicode_ci"}
Couldn't create database for {"adapter"=>"mysql2", "host"=>"localhost", "database"=>"mydb_test"}, {:charset=>"utf8", :collation=>"utf8_unicode_ci"}

我更新了mysql2，mysql --version返回：

mysql  Ver 14.14 Distrib 5.6.16, for osx10.9 (x86_64) using  EditLine wrapper

这是我的database.yml：

development:
  adapter: mysql2
  host: localhost
  database: mydb_dev

# 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
  host: localhost
  database: mydb_test

production:
  adapter: mysql2
  host: localhost
  database: mydb_prod

为什么rake命令无法创建数据库？

Answer 1

尝试以下配置：

adapter: mysql
database: my_db #name of your database
hostname: 127.0.0.1
username: root #your username
password: # your password
socket: /tmp/mysql.sock #socket parameter is also important
pool: 5
timeout: 5000

访问此链接时出现类似问题（Error creating Rails DB using rake db:create）

Answer 2

尝试指定数据库的用户名和密码。

development:
  adapter: mysql2
  host: localhost
  database: mydb_dev
  username: root
  password:

您可以在Rails Guide

中详细了解如何配置数据库

无法为Rails应用程序创建数据库

2 个答案: