From: Dave Lilley <dglnz2@...>
Date: 2010-12-15T16:20:35+09:00
Subject: mysql gem segfault on line 343

cross posted from mysql ruby forums

hi there,

using 1.8.7 p302 via rubyinstaller

I can connect to a remote MYSQL server fine via mysql - trouble is i'm
converting a linux app to windows and I have sequel code embedded
throughout my project.

I have 1 script that handles the sql calls below is a sample of what the
class initialization method does and the errors generated.

anyone able to help? (prefer to use sequel gem to save LOTS of
recoding/debugging).

converting on WINXP virtual machine end OS is going to be W2K pro - win
XP systems.

Doesn't seem to matter where i have the line - get_all_acccodes.each{|c|
puts c}
it will segfault anyway.

the version of LIBmysql.dll is one I got from
http://instantrails.rubyforge.org/svn/trunk/InstantRails-win/InstantRails/mysql/bin/libmySQL.dll
that file is 1.484Kb large and i have another that is like 242Kb this
one also segfaults too.



sample code being used...

require 'sequel'
require 'logger'
# require 'mysql'

class Dopen

def initialize(*arg)
@path = "/logs"
@log = Logger.new("#{@path}DB - info.log")
@log.level = Logger::DEBUG

@log.debug('initialing the DB access!')

if arg[0] == 'local'
#was only used for test via my local server - i want to connect to the
remote server only now!
else
puts 'in remote side'
@db = Sequel.mysql(:host => 'remote.co.nz', :user => "user", :password
=> "p/word", :database => "database", :logger => Logger.new( STDOUT ))

# test.each{|r| puts r} <<< 1st errors belong to this line - line 22

get_all_acccodes.each{|c| puts c} <<< 2nd errors belong to this line

# this connection code works fine below!!!
# @db = Mysql.new('remote.co.nz', "user", "p/word",'database')
# remote
end

rescue Sequel::Error
@log.debug("An error occurred\nError code: #{Sequel}\nError message:
#{Sequel.to_s}")
ensure
@log.debug("DB closed!")
# @db.close if @db

end

def get_all_acccodes
@log.debug('getting all account codes')
@db[:cust_data].filter(:closed => 0, :contract => 0) # 1 = true account
is CLOSED, 0 means it's OPEN

#line below works with mysql direct
# @db.query("select * from cust_data where closed = 0 and contract = 0")
end

end

a = Dopen.new 'remote' << allows for quick switching when i was
developing locally


*** end of teh script file ****

Now if I change the connect line from Sequel.mysql(...) to
Sequel.mysql.connect(...) i get a reference to as per error 3 - No user
or password for Dave @ localhost!!!

I'm not conecting to a local host.

I do have Mysql community installed but will need to remove it to gain
disk space back, I only did this because originally i couldn't even
connect to the remote Mysql server and I thought i might need it
locally.

any pointers on what I'm doing wrong?

many thanks for any - all help.

dave.


1st errors for simple show version of server being run....

C:\monitoring screen>ruby -rubygems sequel1.rb
in remote side
I, [2010-12-14T22:54:15.335004 #2740] INFO -- : (0.190273s) SET
@@wait_timeout
= 2147483
I, [2010-12-14T22:54:15.535292 #2740] INFO -- : (0.200288s) SET
SQL_AUTO_IS_NUL
L=0
I, [2010-12-14T22:54:15.715552 #2740] INFO -- : (0.180260s) SELECT
VERSION()
VERSION()5.1.52
#<Sequel::MySQL::Dataset:0x2d6aec0>
#<Sequel::MySQL::Dataset:0x2d6a278>
sequel1.rb:22:in `initialize': undefined method `each' for nil:NilClass
(NoMetho
dError)
from sequel1.rb:159:in `new'
from sequel1.rb:159

C:\monitoring screen>


2nd error

C:\monitoring screen>ruby -rubygems sequel1.rb
in remote side
I, [2010-12-14T22:55:11.310100 #2776] INFO -- : (0.190273s) SET
@@wait_timeout
= 2147483
I, [2010-12-14T22:55:11.500374 #2776] INFO -- : (0.190274s) SET
SQL_AUTO_IS_NUL
L=0
I, [2010-12-14T22:55:11.710676 #2776] INFO -- : (0.210302s) SELECT *
FROM `cust
_data` WHERE ((`closed` = 0) AND (`contract` = 0))
C:/Ruby187/lib/ruby/gems/1.8/gems/sequel-3.18.0/lib/sequel/adapters/mysql.rb:343
: [BUG] Segmentation fault
ruby 1.8.7 (2010-08-16 patchlevel 302) [i386-mingw32]


This application has requested the Runtime to terminate it in an unusual
way.
Please contact the application's support team for more information.

C:\monitoring screen>


3rd error output...

C:\monitoring screen>ruby -rubygems sequel1.rb
in remote side
C:/Ruby187/lib/ruby/gems/1.8/gems/sequel-3.18.0/lib/sequel/adapters/mysql.rb:112
:in `real_connect': Access denied for user 'dave'@'localhost' (using
password: N
O) (Mysql::Error)
from C:/Ruby187/lib/ruby/gems/1.8/gems/sequel-3.18.0/lib/sequel/adapters
/mysql.rb:112:in `connect'
from sequel1.rb:20:in `initialize'
from sequel1.rb:160:in `new'
from sequel1.rb:160

C:\monitoring screen>

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