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"Nested data access loop" warning

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Hi,

I'm getting nested data access loop warning. The code is working as expected but how can i change it to remove the nested loop?


       List orders = new List(Types::Class); 
       
        while select FieldA, FieldB from TableA
            group by TableA.FieldA, TableA.FieldB, salesLine.ReferenceField, salesLine.SalesId 
            where TableA.FieldA == "123"
              && TableA.FieldB == "ABC"
       join sum(FieldC) from TableB 
           where TableB.RefId == TableA.RecId
       join RecId from TableC
           where TableC.LinkId == TableA.LinkId
       join ReferenceField, SalesId from salesLine
           where salesLine.LinkId == TableC.LinkId
             && salesLine.Number1 != ''
             && salesLine.Id1 != ''
        {
            Contract contract = new contract();
            List x = new List(Types::Class);

            contract.parmNumber1(salesLine.Number1);
            contract.parmLineAmount(projInvoiceItemDetail.LineAmount);

            SalesLine salesLineLocal;
            while select Id1,Id2 from salesLineLocal
                    group by Id1, Id2
                    where salesLineLocal.SalesId == salesLine.SalesId
                        && salesLineLocal.Number1 == salesLine.Number1
            {
                if(SetupTable::Exists(salesLineLocal.Id1 salesLineLocal.Id2))
                {
                    x.addEnd(this.populateR(salesLineLocal.Id1, salesLineLocal.Id2));
                }
            }

            contract.parmR(x);

            orders.addEnd(contract);

        }

private List populateR(Id1 _Id1, Id2 _Id2)
{
    List y =  new List(Types::Class);

    Class1 class1 = new Class1();
    class1 = SetupTable::getSetup(_Id1, _Id2);

    y.addEnd(class1);

    return y;
}

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Dynamics 365 Finance

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Ramesh Kumar 7,537 Super User 2025 Season 2 on at

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I think You're getting the nested data access loop warning because of the inner while select loop inside your outer while select.

Thanks

Ramesh

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Martin Dráb 238,149 Most Valuable Professional on at

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The warning is indeed about the nested while selects. If you can replace it with a join, the result will be much more efficient. It's not always possible (and you can suppress the warning in such cases).

What you definitely can improve is replacing the call of SetupTable::exists() with a join. It'll decrease the number of database calls by the number of records returned by the outer loop (if I disregard caching).

I can't comment on methods like getSetup(), because I have no information about your code there.

By the way, are you sure that the list in populateR() makes sense? It creates a new list every time containing exactly one element. The list x is then a collection of such one-element lists. Isn't it easier and more efficient to return class1 from populateR()?

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