transfer.sql

declare function SourceAccountIsValid(src, dst, req){
}
declare function SourceAccountHasFunds(src, dst, req){
}
declare function validate_transfer(src, dst, req){
  var rules = [SourceAccountIsValid, SourceAccountHasFunds, 
               SourceAccountDailyLimitNotExceed, DestinationAccountHasNoLiens, 
               DestinationAccountMaxAmountNotExceeded, MoneyTransferIsNotFromDirtyBitcoins
              ];
  var errors = rules.map(rule=> rule(src, dst, req).filter(x=>x!= null);
  return { Errors: errors, Valid: errores.length == 0 };
}
from Accounts as src
where id(src) == $source
load $destination as dst
select {
 Source: src,
 Destination: dst,
 Valid: validate_transfer(src, dst, $req)
}