Skip to main content

ServiceNow getRowCount versus GlideAggregate (best practice)

 see developer site

and docs 

and my article on passing a gr to a ga

 

Use GlideAggregate for Simple Record Counting

If you need to count rows, you have two options: the getRowCount() method from GlideRecord, or GlideAggregate. Using GlideRecord to count rows can cause scalability issues as tables grow over time, because it retrieves every record with the query and then counts them. GlideAggregate gets its result from built-in database functionality, which is much quicker and doesn't suffer from the scalability issues that GlideRecord does.

Bad example:

/*
 * countInactiveIncidents - return the number of closed incidents
 *
 * @param - none
 * @returns integer - number of records found
 *
 */
function countInactiveIncidents() {

     var inc = new GlideRecord('incident');

     inc.addInactiveQuery();
     inc.query();

     var count = inc.getRowCount();
     gs.print(count + ' inactive incidents found');

     return count;
}
Good example:
/*
 * countInactiveIncidents - return the number of closed incidents
 *
 * @param - none
 * @returns integer - number of records found
 *
 */
function countInactiveIncidents() {

     var inc = new GlideAggregate('incident');

     inc.addAggregate('COUNT')
     inc.addInactiveQuery();
     inc.query();

     var count = 0;
     if (inc.next())
          count = inc.getAggregate('COUNT');

     gs.print(count + ' inactive incidents found');

     return count;
}  

 


Comments

  1. Thank you for writing this article, Ruen! I learned a thing or two about the GlideAggregate API from your code. I did not know that we could use the addInactiveQuery() method with this API and upon checking the official documentation, I read that the GlideAggregate class is an extension of GlideRecord.

    ReplyDelete

Post a Comment

Popular posts from this blog

Get URL Parameter - server side script (portal or classic UI)

Classic UI : var sURL_editparam = gs . action . getGlideURI (). getMap (). get ( ' sysparm_aparameter ' ); if ( sURL_editparam == 'true' ) { gs . addInfoMessage ( 'parameter passed ); } Portal : var sURL_editparam = $sp . getParameter ( " sysparm_aparameter " ); if ( sURL_editparam == 'true' ) { gs . addInfoMessage ( 'parameter passed ); }

ServiceNow check for null or nil or empty (or not)

Haven't tested these all recently within global/local scopes, so feel free to have a play! option 1 use an encoded query embedded in the GlideRecord , e.g.  var grProf = new GlideRecord ( 'x_cls_clear_skye_i_profile' ); grProf . addQuery ( 'status=1^ owner=NULL ' ); grProf . query (); even better use the glideRecord  addNotNullQuery or addNullQuery option 2 JSUtil.nil / notNil (this might be the most powerful. See this link ) example: if ( current . operation () == 'insert' && JSUtil . notNil ( current . parent ) && ! current . work_effort . nil ())  option 3 there might be times when you need to get inside the GlideRecord and perform the check there, for example if the code goes down 2 optional routes depending on null / not null can use gs.nil : var grAppr = new GlideRecord ( 'sysapproval_approver' ); var grUser = new GlideRecord ( 'sys_user' ); if ( grUser . get ( 'sys_id' , current . approver )){