Facter ignoring variables at runtime - variables

Question

I have a Facter custom fact for use in Puppet that should generate a list of specific information, but it doesn't always work correctly, even on servers running the exact same versions of ruby, facter, puppet, and mysql. The code is below:
#backends.rb
puts "Backends retrieval"
if Facter.value('demainversion') == '2'
dbasename = Facter.value('dbasename')
if dbasename == ''
dbasename = 'database'
end
mysqlcmd = "mysql -uUser -pPassword #{dbasename} --skip_column_names -e "
if Facter.value('clustered')
dbasename = Facter.value('dbasename')
mysqlcmd = "mysql -uUser -pPassword -hclustered-host #{dbasename} --skip_column_names -e "
end
puts mysqlcmd
clients = Facter.value('databases').split(', ')
if clients != ''
clients.each do |client|
count = 0
client_id =
res =
backends = ""
facter_name = "#{client.gsub(' ','_')}_backends"
Facter.add("#{facter_name}") do
setcode do
puts "#{client} listing"
client_id = %x[#{mysqlcmd}"SELECT id FROM UserGroup WHERE groupName='#{client.strip}'"].strip
puts "#{client_id} listing"
puts backends
res = %x[#{mysqlcmd}"SELECT sourceMachine,sourceUser FROM GrabberJob WHERE clientGroup_id=#{client_id.strip}"].strip
res.each do |row|
machine = row.split(' ')[0]
login = row.split(' ')[1]
val = login.gsub('admin','')
if count == 0
backends << machine.strip << "(" << val << ")"
else
backends << ", " << machine.strip << "(" << val << ")"
end
count += 1
end
backends.strip
end
end
end
end
end
When puppet (or irb) runs this it may (or may not) return ...
ERROR 1046 (3D000) at line 1: No database selected
... but if the server throws the error it will continue to exhibit the problem. I know that the dbasename variable is set correctly, courtesy of the puts statements used for debugging, but the variable is ignored when the mysql commands are actually run.
I have also tried adding a USE #{dbasename}; statement to the client_id and res commands to no avail. Any suggestions on what I could do to make it work consistently would be most appreciated.