Usernames and database names have to be quoted.

lib/influxdb/query/cluster.rb

@@ -2,15 +2,15 @@ module InfluxDB
   module Query
     module Cluster # :nodoc:
       def create_cluster_admin(username, password)
-        execute("CREATE USER #{username} WITH PASSWORD '#{password}' WITH ALL PRIVILEGES")
+        execute("CREATE USER \"#{username}\" WITH PASSWORD '#{password}' WITH ALL PRIVILEGES")
       end
 
       def list_cluster_admins
         list_users.select { |u| u["admin".freeze] }.map { |u| u["username".freeze] }
       end
 
       def revoke_cluster_admin_privileges(username)
-        execute("REVOKE ALL PRIVILEGES FROM #{username}")
+        execute("REVOKE ALL PRIVILEGES FROM \"#{username}\"")
       end
     end
   end

lib/influxdb/query/continuous_query.rb

@@ -24,7 +24,7 @@ def create_continuous_query(name, database, query, resample_every: nil, resample
       end
 
       def delete_continuous_query(name, database)
-        execute("DROP CONTINUOUS QUERY #{name} ON #{database}")
+        execute("DROP CONTINUOUS QUERY \"#{name}\" ON \"#{database}\"")
       end
     end
   end

lib/influxdb/query/database.rb

@@ -2,11 +2,11 @@ module InfluxDB
   module Query
     module Database # :nodoc:
       def create_database(name = nil)
-        execute("CREATE DATABASE #{name || config.database}")
+        execute("CREATE DATABASE \"#{name || config.database}\"")
       end
 
       def delete_database(name = nil)
-        execute("DROP DATABASE #{name || config.database}")
+        execute("DROP DATABASE \"#{name || config.database}\"")
       end
 
       def list_databases

lib/influxdb/query/user.rb

@@ -6,36 +6,36 @@ module User # :nodoc:
       def create_database_user(database, username, password, options = {})
         permissions = options.fetch(:permissions, :all)
         execute(
-          "CREATE user #{username} WITH PASSWORD '#{password}'; "\
-          "GRANT #{permissions.to_s.upcase} ON #{database} TO #{username}"
+          "CREATE user \"#{username}\" WITH PASSWORD '#{password}'; "\
+          "GRANT #{permissions.to_s.upcase} ON \"#{database}\" TO \"#{username}\""
         )
       end
 
       def update_user_password(username, password)
-        execute("SET PASSWORD FOR #{username} = '#{password}'")
+        execute("SET PASSWORD FOR \"#{username}\" = '#{password}'")
       end
 
       # permission => [:all]
       def grant_user_admin_privileges(username)
-        execute("GRANT ALL PRIVILEGES TO #{username}")
+        execute("GRANT ALL PRIVILEGES TO \"#{username}\"")
       end
 
       # permission => [:read|:write|:all]
       def grant_user_privileges(username, database, permission)
-        execute("GRANT #{permission.to_s.upcase} ON #{database} TO #{username}")
+        execute("GRANT #{permission.to_s.upcase} ON \"#{database}\" TO \"#{username}\"")
       end
 
       def list_user_grants(username)
-        execute("SHOW GRANTS FOR #{username}")
+        execute("SHOW GRANTS FOR \"#{username}\"")
       end
 
       # permission => [:read|:write|:all]
       def revoke_user_privileges(username, database, permission)
-        execute("REVOKE #{permission.to_s.upcase} ON #{database} FROM #{username}")
+        execute("REVOKE #{permission.to_s.upcase} ON \"#{database}\" FROM \"#{username}\"")
       end
 
       def delete_user(username)
-        execute("DROP USER #{username}")
+        execute("DROP USER \"#{username}\"")
       end
 
       # => [{"username"=>"usr", "admin"=>true}, {"username"=>"justauser", "admin"=>false}]