How to check if data in data extension is present or clear by someone accidently using SSJS?

Question

We are adding below code to check if Data extension is present or someone has deleted accidently , as we are fetching content ( with only one row) from DE to display on a cloudpage if someone delete it accidently there should not be 500 error , so we implemented try and catch in SSJS.

But also we need to make sure if someone clears Data from DE accidnetly then also that should capture in Try block , we tried but without any success below is the code

   <script runat=server language="JavaScript">

   var HeaderDE , HeaderDECheckRowCount ;
   HeaderDE = "DataExtension_Name";

try {
      HeaderDE = Platform.Function.LookupRows(HeaderDE,'Id','1'); /* to check DE is exist or not */ - working fine 
      HeaderDECheckRowCount = Platform.Function.rowcount(HeaderDE); /* to check DE has at least one row */  - not working 
 
if (HeaderD > 0)
 {
      HeaderDEExist = true;
 }
 else
 {
   HeaderDEExist = false;
 }
    }
catch (e) 
    {
       HeaderDEExist = false;
    }

Platform.Variable.SetValue("@HeaderDEExist",HeaderDEExist);

</script>

We are able to check and handle if we delete DE but not able to catch if someone clear data from DE , DE has only one row

Answer 1

Check the Platform.Function.LookupRows documentation for an example of how to emulate a rowcount:

https://developer.salesforce.com/docs/marketing/marketing-cloud/guide/ssjs_platformDataExtensionLookupRows.html

Essentially you just look at the result of Platform.Function.LookupRows like the array that it is, and count its elements (= you count rows).

<script runat="server">
     var dataRows = Platform.Function.LookupRows('CustomerData',['FirstName','LastName'],['Angela','Cruz']);
     if(dataRows && dataRows.length > 0) {
          for(var i=0; i<dataRows.length; i++) {
               Platform.Response.Write(dataRows[i]["Email"]);
          }
     }
</script>

Your specific example can of course get rid of the for loop:

<script runat="server">
     var dataRows = Platform.Function.LookupRows('CustomerData',['FirstName','LastName'],['Angela','Cruz']);
     if(dataRows && dataRows.length > 0) {
          /* check for at least one record was successful, perform rest of code */
     }
</script>

Answer 2

Referring to the SF page, I am afraid there is no such rowcount platform function (Platform.Function.rowcount).

You will likely need to do a Rows.Retrieve and get the length of the result array. This may help.