topic Re: about OPEN function in SAS Programming

about OPEN function

LinyuanQin — Sun, 16 Mar 2014 14:32:05 GMT

Hi SAS team!

My code was like this:

%macro a;

data sample1;

a=1;

run;

data lack;

run;

%let s1=%sysfunc(open(sample1));

%let lk=%sysfunc(open(lack));

%if &s1>0 and &lk>0 %then %do;

%put &s1 &lk;

%end;

%else %do;

%put "one of the dataset can not be opened";

%end;

%let rc=%sysfunc(close(&s1));

%let rc=%sysfunc(close(&lk));

%mend a;

%a;

i expected that the note of "one of the dataset can not be opened" were written to the LOG, but the result was "1 2". Would anyone could explain how it happened and demonstrate the usage of OPEN function or other functions if the former note would be written.

Appreciate any help!

Qinly

Re: about OPEN function

Tom — Sun, 16 Mar 2014 14:35:25 GMT

OPEN will return a file handle number. Hence the 1 and 2 that you see in the log.

They should both successfully open the datasets you just created .

Re: about OPEN function

LinyuanQin — Sun, 16 Mar 2014 14:43:29 GMT

Thank you, Tom. And if both data sets do exist, but one of them has no obs, just like data set lack, which function could achieve my purpose?

Re: about OPEN function

Tom — Sun, 16 Mar 2014 14:53:42 GMT

You could try FETCH()

Re: about OPEN function

LinyuanQin — Mon, 17 Mar 2014 01:03:16 GMT

Thank you, Tom! I've solved it by your suggestion.