```Lua
local Database = require "resources.functions.database"
local dbh = Database.new('system')
--get the domain_uuid
if (domain_uuid == nil) and (domain_name ~= nil) then
local sql = "SELECT domain_uuid FROM v_domains "
sql = sql .. "WHERE domain_name='" .. domain_name .. "';"
domain_uuid = dbh:first_value(sql)
end
local dbh_switch = Database.new('switch') -- check also SQLite file.
local row = dbh_switch:first_row(sql)
if row then
...
end
```
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