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Not fetching through a set

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    Not fetching through a set

    I have a set called "EnterRegLogging", which has Parent "EnterRegInput" and a Child "Logging" on a one-to-many link.
    I am trying to get to each child record for each parent and do some processing.

    I found an example in the documentation and gave it a go.

    Code:
    trace.clear("test")
    set_ptr      = set.open_session("enterreglogging")
    Parent_ptr   = set_ptr.enterreginput
    child_ptr    = set_ptr.logging
    set_ptr.fetch_first()
    while .not. set_ptr.fetch_eof()
        child_reg = child_ptr.reg
        child_unique = child_ptr.unique
        child_ac_unique = child_ptr.ac_unique
        trace.writeln(rtrim(child_reg)+" has Unique "+child_unique+" with ac_unique of "+child_ac_unique,"test")
        set_ptr.fetch_next()
    end while
    set_ptr.close()
    the above script lists every child record for the first parent, but I cannot get it to do the rest. (my parent test table has 23 records and the child table has 155, each parent has varying number of child records (in my test file, between 0 and 70 for each parent).
    I think Im missing something here, but not sure what, Guidance would be appreciated.
    Last edited by Graham Wickens; 02-26-2019, 08:57 AM. Reason: additional info
    --
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    #2
    Re: Not fetching through a set

    I did try puting the set loop inside a loop of the parent records and got the same result.
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    Comment


      #3
      Re: Not fetching through a set

      Graham,

      The pointer problem.

      Code:
      [COLOR="#FF0000"]set_ptr[/COLOR].fetch_first()
      while .not. [COLOR="#FF0000"]set_ptr[/COLOR].fetch_eof()
      it will be the parent's pointer , Parent_ptr

      Comment


        #4
        Re: Not fetching through a set

        OK, gave that a try, but same result

        Code:
        trace.clear("test")
        set_ptr      = set.open_session("enterreglogging")
        [COLOR="#FF0000"]Parent_ptr [/COLOR]  = set_ptr.enterreginput
        child_ptr    = set_ptr.logging
        [COLOR="#FF0000"]Parent_ptr[/COLOR].fetch_first()
        while .not. [COLOR="#FF0000"]parent_ptr[/COLOR].fetch_eof()
        	Parent_reg = parent_ptr.reg
        	child_unique = child_ptr.unique
        	child_ac_unique = child_ptr.ac_unique
        	trace.writeln(rtrim(parent_reg)+" has Unique "+child_unique+" with ac_unique of "+child_ac_unique,"test")
        	[COLOR="#FF0000"]parent_ptr[/COLOR].fetch_next()
        end while
        set_ptr.close()
        still only the first Parent value with all 70 child records
        --
        Support your local Search and Rescue Unit, Get Lost!

        www.westrowops.co.uk

        Comment


          #5
          Re: Not fetching through a set

          Try this code from AlphaSports

          Code:
          dim cRecords as c=""
          dim ptr as p 
          dim sHdr as p 
          dim sItm as p 
          
          s = set.open_session("invoice.set")
          'on error goto 0 
          'get pointer to invoice_header table
          tih = s.invoice_header 
          
          'get pointer to invoice_items table
          tii = s.invoice_items 
          t2 = s.customer
          
          'tih.index_primary_put("")
          tih.fetch_first()
          while .not. tih.fetch_eof()
          	'msgbox("test",t2.lastname )
          	cRecords = cRecords+str(tih.recno() )+crlf()
          	tih.fetch_next()
          end while
          
          s.close()
          
          showvar(cRecords,"test")  'check the result

          Comment


            #6
            Re: Not fetching through a set

            Same again, just first parent record
            --
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            Comment


              #7
              Re: Not fetching through a set

              Well,

              How about change to active this " tih.index_primary_put("") " and also check the Set table name.

              Comment


                #8
                Re: Not fetching through a set

                Originally posted by johnkoh View Post
                Well,

                How about change to active this " tih.index_primary_put("") " and also check the Set table name.
                John finally got it to work

                Code:
                dim cdata as c = ""
                dim shared set_ptr as P
                dim shared parent_ptr as p
                dim shared child_ptr as p
                set_ptr = set.open_session("enterreglogging.set")
                parent_ptr = set_ptr.enterreginput
                child_ptr  = set_ptr.logging
                tbl = table.current()
                filter = ".t."
                query.filter = "flattenquery("+filter+")"
                qry = parent_ptr.query_create()
                set_ptr.fetch_first()
                while .NOT. set_ptr.fetch_eof()
                     cdata = cdata+child_ptr.reg+" "+child_ptr.When+" "+child_ptr.where+" "+child_ptr.unique+crlf()
                  set_ptr.fetch_next()
                end while
                set_ptr.close()
                showvar(cdata,"test")
                --
                Support your local Search and Rescue Unit, Get Lost!

                www.westrowops.co.uk

                Comment

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