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Resolved Linked table column

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  1. Haakon Langballe
    Haakon Langballe
  2. PowerBuilder
  3. Friday, 22 November 2019 13:31 PM UTC

Hi.

In the project I maintain, there is apparently a filed in a data window that is linked with a key to a column in a  different table. I've been struggling to find where this link is defined. The data source is not joining the other table in (as far as I can see).

Where do I find the definition/code for this link and what is it named in Powerbuilder?

 

Thanks

Haakon

  1. PowerBuilder (Appeon)
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Haakon Langballe
Haakon Langballe Accepted Answer Pending Moderation
  1. Friday, 22 November 2019 14:15 PM UTC
  2. PowerBuilder
  3. # 1

I realized that the control in question is a drop-down listbox.

I guess the drop-down list is populated at a later stage.

In the controls tree I found a datawindow that is canditate for the dd-listbox but I cant find any reference to that in the properties for the ddlb in the original datawindow. Could the list be loaded dynamically? 

Cheers
Haakon

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Michael Kramer
  1. Michael Kramer
  2. Friday, 22 November 2019 14:29 PM UTC
Sometimes developers choose to create embedded SQL cursor and fetch data explicitly into DDLB instead of defining a "list DW object" and uses that as DDDW. Takes more code and runs slower than DDDW.
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Michael Kramer
Michael Kramer Accepted Answer Pending Moderation
  1. Friday, 22 November 2019 13:39 PM UTC
  2. PowerBuilder
  3. # 2

Your field is either a column in the SQL SELECT result set - or it is a computed field.

  • Result set column => Find the column in Column Properties; then check the definition in the Data Source. It can be an expression like a user-defined function hiding the actual JOIN.
  • Computed field => Select the field; in the [General] properties pane click button named […] next to the Compute Expression. NOTE: This MAY be ca call to a PowerScript GLOBAL function.
  • Otherwise, check in the RetrieveEnd script (or RetrieveRow) for code that explicitly retrieves more data and sets such data in the DataWindow using SetItem or ".object" notation.

HTH /Michael

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