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feat: adding SHOWMETA option to mp_jsonout

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Includes updates to associated wrapper macros, and a 30% performance improvement (for small tables).  Addresses https://github.com/sasjs/adapter/issues/607
This commit is contained in:
munja
2022-01-06 23:36:54 +01:00
parent ebd567af48
commit cb07305a87
8 changed files with 778 additions and 666 deletions
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16
server/ms_webout.sas
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@@ -27,6 +27,10 @@
@param [out] fref= (_webout) The fileref to which to write the JSON
@param [in] missing= (NULL) Special numeric missing values can be sent as NULL
(eg `null`) or as STRING values (eg `".a"` or `".b"`)
@param [in] showmeta= (NO) Set to YES to output metadata alongside each table,
such as the column formats and types. The metadata is contained inside an
object with the same name as the table but prefixed with a dollar sign - ie,
`,"$tablename":{"formats":{"col1":"$CHAR1"},"types":{"COL1":"C"}}`
<h4> SAS Macros </h4>
@li mp_jsonout.sas
@@ -41,7 +45,9 @@
**/
%macro ms_webout(action,ds,dslabel=,fref=_webout,fmt=Y,missing=NULL);
%macro ms_webout(action,ds,dslabel=,fref=_webout,fmt=Y,missing=NULL
,showmeta=NO
);
%global _webin_file_count _webin_fileref1 _webin_name1 _program _debug
sasjs_tables;
@@ -93,7 +99,7 @@
%else %if &action=ARR or &action=OBJ %then %do;
%mp_jsonout(&action,&ds,dslabel=&dslabel,fmt=&fmt,jref=&fref
,engine=DATASTEP,missing=&missing
,engine=DATASTEP,missing=&missing,showmeta=&showmeta
)
%end;
%else %if &action=CLOSE %then %do;
@@ -114,9 +120,6 @@
put ",""WORK"":{";
%do i=1 %to &wtcnt;
%let wt=&&wt&i;
proc contents noprint data=&wt
out=_data_ (keep=name type length format:);
run;%let tempds=%scan(&syslast,2,.);
data _null_; file &fref mod encoding='utf-8' termstr=lf;
dsid=open("WORK.&wt",'is');
nlobs=attrn(dsid,'NLOBS');
@@ -126,8 +129,7 @@
put " ""&wt"" : {";
put '"nlobs":' nlobs;
put ',"nvars":' nvars;
%mp_jsonout(OBJ,&tempds,jref=&fref,dslabel=colattrs,engine=DATASTEP)
%mp_jsonout(OBJ,&wt,jref=&fref,dslabel=first10rows,engine=DATASTEP)
%mp_jsonout(OBJ,&wt,jref=&fref,dslabel=first10rows,showmeta=YES)
data _null_; file &fref mod encoding='utf-8' termstr=lf;
put "}";
%end;