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Dynamics 365 Community / Forums / Small and medium business | Business Central, N... / Understanding queries ...
Small and medium business | Business Central, N...
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Understanding queries (setfilter, find, etc.)

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Posted on by Hedi Daneels 487

Hello Everyone,

I have reread the documentation a couple of times, and I still have a hard time to grasp how the queries work.

For example, if i want to delete a record, here is my result in c/al, compared to a simple sql statement:

Var

lines : Record "Sales Line";

Begin

lines.Init();
lines.SETFILTER("Document No.", "No.");
lines.SetRange("Line No.", 2);
lines.Find('-');
lines.Delete();

The sql version is

DELETE FROM "Sales line" WHERE "Document No." = "No." AND "Line No." = 2;

Am I missing something? Or is it really that convoluted?

Cheers

I have the same question (0)
  • Verified answer
    Community Member Profile Picture
    Community Member on at

    You can lose the init line. INIT is used to initialise a record variable and set all fields (except primary key fields) to either blank values or their predefined InitValue. Usually you do this when creating a new record.

    Also you should add (TRUE) as a parameter to the end of your DELETE statement. This invokes the OnDelete trigger of the table, and is important as code there checks the validity of the action, and also deletes connected records (eg comments, reservations).

    If this is specifically for table 37 Sales Line, you should also filter Document Type, as there can be multiples of the same Document No., eg an Order and an Invoice.

    Shorter code would simply be:

    SalesLine.GET("Document Type","No.",2);
    SalesLine.DELETE(TRUE);

    But to simply fix up your code a bit:

    lines.SETRANGE("Document Type","Document Type");
    lines.SETRANGE("Document No.","No.");
    lines.SETRANGE("Line No.", 2);
    lines.FINDFIRST;
    lines.DELETE(TRUE);

  • Hedi Daneels Profile Picture
    Hedi Daneels 487 on at

    The shorter version already looks way better than mine. Thank you. I understand a couple of things better now!

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