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Active Link, tbl.query_create(), "Cannot use function in this context"

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    Active Link, tbl.query_create(), "Cannot use function in this context"

    Converting a working A5 app to SQL backend.
    Exported the existing Alpha tables; created active link tables.
    Can fully browse all active link table data - all looks good.
    Default form & default browse for all tables are good.

    However, I believe I am getting errors on every table.query_create()

    qry = tbl.query_create()
    "Cannot use function in this context"

    Last edited by fsi; 05-24-2008, 06:36 PM.

    Re: Active Link, tbl.query_create(), "Cannot use function in this context"

    Originally posted by fsi View Post
    Converting a working A5 app to SQL backend.
    Exported the existing Alpha tables; created active link tables.
    Can fully browse all active link table data - all looks good.
    Default form & default browse for all tables are good.

    However, I believe I am getting errors on every table.query_create()

    qry = tbl.query_create()
    "Cannot use function in this context"

    what syntax are you using?
    are you using this syntax:

    query.filter = "filterexpression"
    query.order = "orderexpression"
    qry = tbl.query_create()

    or are you specifying the filter and order directly as arguments of the .query_create() method.


    qry = tbl.query_create("","filterexpression","orderexpression")

    if you have not tried the second syntax, please try it.

    also, what is your filter expression, and do you have the latest updates?


      Re: Active Link, tbl.query_create(), "Cannot use function in this context"

      I had been using the following syntax in the error-free native Alpha table approach:

      query.filter = "filterexpression"
      query.order = "orderexpression"
      qry = tbl.query_create()

      And this works perfectly when running against the native Alpha tables.

      I have updated to patch level 1479-3182 in response to your inquiry.

      Filter expression (one of many that cause same error - but error ONLY in Active Link):

      qf = "isblank(" + chr(34) + "dispatch_date" + chr(34) + ")"
      qf = qf + " .and. ((Created_By = Var->LoggedUser) .or."
      qf = qf + " (Var->UserType = " + chr(34) + "S" + chr(34) + ")"
      qf = qf + " .or. (Stores->Maint_Group = Var->MaintGroup))"

      I have tried qry = tbl.query_create("","filterexpression","orderexpression"); same results:

      Script:OnInit line:75
      qry = tbl.query_create("",qf,"")
      Cannot use function in this context

      In addition, there is odd behavior in an embedded browse. With native Alpha tables, all cells in the browse are indeed properly populated; but with no changes other than conversion to Active Link (identical data), some cells do not populate, but rather remain blank. I see this as alikely side-effect of the query problem above.

      Also, it appears this may - but not yet conclusive - be related to SETS. My initial form is bound to just a single table; the query against that single table seems to go without error. The error above an example of an error generated within a form that is bound to a set.


      The query expression itself seems to be the culprit. I changed the query to simply:
      qf = "isblank(" + chr(34) + "dispatch_date" + chr(34) + ")" and the query executed without error.
      However, when adding the next qualifier:
      qf = qf + " .and. (Created_By = Var->LoggedUser)
      The error reappears. This executes fine against Alpha tables; but error in Active Link.
      If I change qf = qf + " .and. (Created_By = Var->LoggedUser) to
      qf = qf + " .and. (Created_By = " + chr(34) + "USER01" + chr(34) there is NO ERROR.
      But, of course, it's essential that I be able to query based on the value of my variable!


      I did not have quotation marks around Var->LoggedUser... testing theory, will report back.
      Also not quite sure why I had "Var->UserType" in line three; researching possible flaw.


      Looks like my error (actually, TWO errors)... no quote marks around Var->LoggedUser. I'm not quite sure how Alpha managed to interpret my wishes based on Var->UserType, but it did. I see now that is in error. Back to the drawing board to create a better filter expression.


      Gee whiz, Alpha is smart!
      Last edited by fsi; 05-25-2008, 11:43 AM.