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How do I know if a GET succeeded in fetching the record? [message #811661]

Fri, 02 March 2012 12:04

Eclipse User

I'm posting some code to make my point, but it's really a more general question.

function fetchSomeField(someOtherRecordID bigInt) returns (Timestamp?)
  someRecord1 SOMERECORD;
  get someRecord1 from ds using (someOtherRecordID) with #sql{
    select * from someTable where OTHERRECORD_ID = ?
  };
  if (someRecord1 != null) <-- Fails, it's not null, even though such record doesn't exist 
    return (someRecord1.timestampField1);
  else
    return (null);
  end
end

How do I know if the GET action did actually fetch a record or not?

Re: How do I know if a GET succeeded in fetching the record? [message #811740 is a reply to message #811661]

Fri, 02 March 2012 14:18

Eclipse User

In the meanwhile, I'm using this:

function fetchSomeField(someOtherRecordID bigInt) returns (Timestamp?)
  someRecord1 SOMERECORD;
  rs SQLResultSet?;
  open rs from ds using(someOtherRecordID) with #sql{
    select * from someTable where OTHERRECORD_ID = ?
  };
  if (rs.setNext())
    get someRecord1 from rs;
    return (someRecord1.timestampField1);
  else
    return (null);
  end
end

It looks quite right actually! Smile

Re: How do I know if a GET succeeded in fetching the record? [message #812398 is a reply to message #811661]

Sat, 03 March 2012 14:04

Eclipse User

Hi

The first code you wrote was almost correct. You are checking someRecord1 for null, but you did not define it as nullable. Without a ? the initial value is an empty record and you can't even assign null to it.

someRecord1 SOMERECORD;
should be:
someRecord1 SOMERECORD?;

Adding the ? to the declaration sets someRecord1's initial value to null. If no record is returned from the get it will remain null.

The second example accomplishes the same thing.

regards,
Joe

Re: How do I know if a GET succeeded in fetching the record? [message #813815 is a reply to message #812398]

Mon, 05 March 2012 13:39

Eclipse User

I forgot about nullable semantics. Thanks, Joe!

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