使用 DataMapper 时找不到 _mysql_init

Question

I have a simple MySQL table:

% mysql -u rampion dev -e 'describe person'
+-------+--------------+------+-----+---------+----------------+
| Field | Type         | Null | Key | Default | Extra          |
+-------+--------------+------+-----+---------+----------------+
| id    | int(11)      | NO   | UNI | NULL    | auto_increment |
| uid   | varchar(256) | NO   | PRI | NULL    |                |
+-------+--------------+------+-----+---------+----------------+

And a simple DataMapper script I want to run:

# temp.rb
require 'rubygems'
require 'datamapper'

DataMapper::Logger.new($stdout, :debug)
DataMapper.setup(:default, "mysql://rampion@localhost/dev")

class Person
  include DataMapper::Resource
  property :id,     Serial
  property :uid,    String
end

DataMapper.finalize

p Person.first_or_create(:uid => 'Steve')

But when I run it, I get dynamic linker errors:

% ruby temp.rb
~/.rvm/gems/ruby-1.8.7-p334/gems/dm-validations-1.0.2/lib/dm-validations.rb:33: warning: already initialized constant OrderedHash
DataObjects::URI.new with arguments is deprecated, use a Hash of URI components (~/.rvm/gems/ruby-1.8.7-p334/gems/dm-do-adapter-1.0.2/lib/dm-do-adapter/adapter.rb:215:in `new') 
dyld: lazy symbol binding failed: Symbol not found: _mysql_init
  Referenced from: ~/.rvm/gems/ruby-1.8.7-p334/gems/do_mysql-0.10.12/lib/do_mysql/do_mysql.bundle
  Expected in: flat namespace

dyld: Symbol not found: _mysql_init
  Referenced from: ~/.rvm/gems/ruby-1.8.7-p334/gems/do_mysql-0.10.12/lib/do_mysql/do_mysql.bundle
  Expected in: flat namespace

zsh: trace trap  ruby temp.rb

I have LD_LIBRARY_PATH set to /usr/local/mysql/lib , which is where I have MySQL installed, and it seems to have _mysql_init defined in there:

% grep '_mysql_init' $LD_LIBRARY_PATH/libmysqlclient.18.dylib
Binary file /usr/local/mysql/lib/libmysqlclient.18.dylib matches

I have no idea what I need to do to fix this.

Answer 1

Seems like an issue with old versions of MySQL, shouldn't happen nowadays see https://github.com/brianmario/mysql2/issues/121