JRuby，Rails 2.3.5，MySQL数据库未使用rake db：create：all创建

Question

Basic information:

Ruby version : 1.8.7
JRuby version: 1.5.3 
Rails version: 2.3.5
Mysql version: Ver 14.14 Distrib 5.1.48, for apple-darwin10.3.0 (i386) using readline 5.1

I've been having a hell of a time trying to get JRuby, Rails, and MySQL to play nicely together. I've come to a dead end and now need some help.

I have installed what I believe to be the correct gems to allow JRoR to talk with MySQL. The list of gems I have installed are below. How I am trying to create a JRoR + MySQL app is like so:

$ jruby -S rails -d mysql app_name
$ cd app_name

Open up Textmate and configure config/database.yml by changing all adapters from "mysql" to "jdbcmysql".

Back in Terminal:

$ jruby -S script/generate scaffold post title:string content:text
$ rake db:create:all

At this point, rake doesn't spit out anything to tell me the databases were created. Here's the result of trying to run my migration:

$ rake db:migrate

rake aborted!
The driver encountered an unknown error: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown database 'app_name_development'

I have no idea what I'm doing wrong and would greatly appreciate help.

Here's my current gem list:

$ jruby -S gem list

* LOCAL GEMS *

abstract (1.0.0)
actionmailer (3.0.0, 2.3.5)
actionpack (3.0.0, 2.3.5)
activemodel (3.0.0)
activerecord (3.0.0, 2.3.5)
activerecord-jdbc-adapter (1.0.2, 0.9.7)
activerecord-jdbcmysql-adapter (1.0.2, 0.9.7)
activerecord-jdbcsqlite3-adapter (0.9.7)
activeresource (3.0.0, 2.3.5)
activesupport (3.0.0, 2.3.10, 2.3.5)
after_commit (1.0.8)
arel (1.0.1)
bouncy-castle-java (1.5.0145.2)
builder (2.1.2)
bundler (1.0.2)
columnize (0.3.1)
erubis (2.6.6)
gem_plugin (0.2.3)
i18n (0.4.1)
jdbc-mysql (5.0.4)
jdbc-sqlite3 (3.6.3.054)
jruby-jars (1.5.3)
jruby-openssl (0.7.2)
jruby-rack (1.0.3)
mail (2.2.7)
mime-types (1.16)
mongrel (1.1.5)
polyglot (0.3.1)
rack (1.2.1, 1.0.1)
rack-mount (0.6.13)
rack-test (0.5.6)
rails (2.3.5)
railties (3.0.0)
rake (0.8.7)
riddle (1.1.0)
rspec (1.3.0)
ruby-debug (0.10.3)
ruby-debug-base (0.10.3.2)
rubyzip (0.9.4)
sources (0.0.1)
thinking-sphinx (1.3.20)
thor (0.14.3)
treetop (1.4.8)
tzinfo (0.3.23)
warbler (1.2.1)
will_paginate (2.3.15)

Answer 1

You shouldn't need to change the database name to jdbcmysql . In fact, doing this defeats db:create(:all) .

http://jruby-extras.rubyforge.org/activerecord-jdbc-adapter/

Answer 2

I noticed the "Unknown database 'app_name_development'" error. Is app_name_development really the name of your database in database.yml? Just checking, because if not, that would be very interesting.

I assume you're not connecting to MySQL with the root account. If that's true, does the user you are connecting with have permissions to create the database app_name_development? By default, only root can create databases. You can grant your user permission with something like this:

GRANT CREATE on app_name_development.* to 'user'@'host';