Empty resultset evaluation

RE: Empty resultset evaluation

ramkumars0001 — Mon, 02 Aug 2021 22:24:57 GMT

Selvakumar Kumarasamy Thanks, this is exactly is what i am looking for.

Thank you for your time and help. Much appreciated.

RE: Empty resultset evaluation

ramkumars0001 — Mon, 02 Aug 2021 22:24:11 GMT

Final goal is to return the list of booleans . I forgot the and in the code snippet.

Objective is to return false when there are no records returned and return true/false if there are records and one of the column is non-blank.

The solution given by Selvakumar Kumarasamy is what i am looking for

index(local!localCollections, "totalCount", 0) = 0

Thank you so much for your time and help. Much appreciated

RE: Empty resultset evaluation

Selvakumar Kumarasamy — Mon, 02 Aug 2021 03:00:58 GMT

Hi ramkumars0001,

The query entity will usually return the results in a data subset type. I could see that you're typically giving the data subset as the input to the forEach(). The function has the ability to operate on the data inside the data subset & if it has no data, then the function will not even call the expression defined. Hence you might not be getting the output.

Below code snippet might help you to return false if there are no data(this is one way, there are other ways too).

a!localVariables(
  local!localCollections: a!queryEntity(
    entity: cons!MY_ENTITY,
    query: a!query(
      logicalExpression: a!queryLogicalExpression(
        operator: "AND",
        filters: {
          a!queryFilter(
            field: "myPK",
            operator: "=",
            value:6
            )
        },
        ignoreFiltersWithEmptyValues: true
      ),
      pagingInfo: a!pagingInfo(startIndex: 1, batchSize: 10)
    ),
    fetchTotalCount: true
  ),
  if(
    index(local!localCollections, "totalCount", 0) = 0,
    false(),
    a!forEach(
      items: local!localCollections,
      expression: if(
        fv!itemCount > 0,
        rule!GBL_isNotBlank(index(fv!item, "status", null)),
        true()
      )
    )
  )
)

But I'm still not getting your specific use case - whether it is to return a boolean array (or) list of items that are not null?

RE: Empty resultset evaluation

Acacio Barrado — Mon, 02 Aug 2021 01:45:21 GMT

Hi Kumar,

What is the current value that you have in your local!localCollections?

If I understood correctly your scenario even after apply the "Not Null" filter you still have null entries in your return?

I'm not sure why you would need the foreach, perhaps you could use reject().

Is your final goal to have a list of Booleans? Or the values that where found in the query?

Sorry if I got confuse here 🙂

RE: Empty resultset evaluation

ramkumars0001 — Mon, 02 Aug 2021 01:22:00 GMT

Acacio,

Many thanks for your time. I figured out after i posted and I have already added the operator not null in operator. The problem is when the user searches for a where clause, chances are it may not match any results and will return no results.

May I know how do I find out if the items i use in a!forEach is a valid list and not a {}.

i had used fv!itemCount in expression of a!forEach. In the below snippt, itreturns true when the itemCount>0, but not returning false when the itemCount =0

a!forEach(
items:local!localCollections,
expression : if(fv!itemCount>0,
rule!GBL_isNotBlank(index(fv!item, "status", null)),
false())

any directions/pointers would be very helpful

RE: Empty resultset evaluation

Acacio Barrado — Mon, 02 Aug 2021 00:22:47 GMT

Hi There,

You could try to add the following filter, that would help you to remove the null values:

          a!queryFilter(
            applyWhen: not(rule!GBL_isNotBlank(ri!NO_BLANK_COLUMN)),
            field: "NO_BLANK_COLUMN",
            operator: "not null",
            value: ri!NO_BLANK_COLUMN
          ),

Hope that helps,

Regards,

Acacio B.