问编写一个只在输入值并单击按钮后才会出现的数据集的函数。

EN

filename response TEMP;
filename respfilt TEMP;

* Get request sets up fresh session and cookies;
proc http
  clear_cache 
  method = "get"
  url ="https://www.treasurydirect.gov/GA-FI/FedInvest/selectSecurityPriceDate.htm"
;
run;

* Post request as performed by XML format button;
* automatically utilizes cookies setup in GET request;
* in= can now directly specify the parameter data to post;

proc http 
  method = "post"
  in = 'priceDate.year=2018&priceDate.month=5&priceDate.day=15&submit=XML+Format'
  url ="https://www.treasurydirect.gov/GA-FI/FedInvest/selectSecurityPriceDate.htm"
  out = response
;
run;

* remove bpd tag from the response (the downloaded xml);

data _null_;
  infile response;
    file respfilt;
  input;
  if _infile_ not in: ('<bpd', '</bpd');
  put _infile_;
run;

* copy data collections from xml file to tables in work library;

libname respfilt xmlv2 ;

proc copy in=respfilt out=work;
run;