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Table_get() in set

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  • #16
    Re: Table_get() in set

    G, I like the looks of your code. Thanks for posting it. I wonder if it could be made a bit more robust by returning zero if the tablename passed to the function is not found? -- tom

    Comment


    • #17
      Re: Table_get() in set

      Sure.
      Code:
      FUNCTION tbl_position AS N (Set_name AS C, Table_name AS C )
      	s_lst=TABLES_IN_SET(set_name)
      	if contains(s_lst,table_name+".dbf")=.f.
      		tbl_position=0
      	else	
      	s=set.open(set_name)
      	dim x as n=1
      	while table.current(x).name_get()<>table_name
      		x=x+1
      	end while
      	tbl_position=x
      	end if	
      END FUNCTION
      Incidentally, table.current(0) is "system".
      I think a better approach than assigning zero if the table does not exist is to issue an error message:
      i.e. in the above code, replace tbl_position=0 with an error message.
      Last edited by G Gabriel; 10-01-2008, 02:10 PM.

      Comment


      • #18
        Re: Table_get() in set

        Originally posted by Michael Humby View Post
        I need to refer to the tables as table.current(), it is simpler.
        Why is it simpler?

        Table_get() does not give me Table.current() it gives me an open table that needs further manipulation for lots of reference such as opening, closing, running queries on child tables, deleting child records etc.
        Table.current() also give you an open table. There's no real difference.

        Think of a form showing the parent and several child browses then I can refer simply to any totals, scripts etc using:

        Table.current(1) the parent
        t=table.current(4)
        t=table.current(5) etc

        This give me the current child table that I can reference directly.
        t=table.get("Customers")
        t=table.get("invoices") etc

        or

        t1=table.get("Customers")
        t2=table.get("invoices") etc

        Why is table.current() better?

        If you go to www.instantnurserymanager.co.uk/demos you will see some forms based on a parent and up to 10 different child records.
        I see a web page. No "forms", unless you mean web "forms"? Don't understand what you are showing us?
        Peter
        AlphaBase Solutions, LLC

        [email protected]
        https://www.alphabasesolutions.com


        Comment


        • #19
          Re: Table_get() in set

          G. Thanks.

          I didn't know table.current(0) meant anything. Thanks for the info.

          I suggested zero since the function returns a numeric result. As long as the coder knows what numeric value is returned when a matching table is not found any number (other than a valid slot number) will suffice. I prefer to trap the error in the calling code, rather than embed the trap into the function, though I suppose this is a matter of personal preference. thanks again.

          -- tom

          Comment


          • #20
            Re: Table_get() in set

            Michael,

            I think you are missing my point. Table.open opens a new instance of the table. table.current and table.get both return a pointer reference to the currently opened table. The only different between table.current and table.get is the way you specify the open table that you want, either by number or name. See excerpt from the help for table.current.

            The TABLE.CURRENT() method returns an object pointer to an open table in the current session. Use TABLE.CURRENT()without a parameter to return a pointer to the sessionís primary table.

            If no table is found in a particular slot, TABLE.CURRENT()creates an invalid object pointer. You can test the validity of an object pointer using the IS_OBJECT() function.

            You can also get a pointer to an open table using the TABLE.GET() method. For example, if you have opened a set and you want to get a pointer to one of the child tables in the set, (say "Invoice_Items"), you could use this command:

            child = table.get("invoice_items")
            Jeff
            Jeff Ryder

            Comment


            • #21
              Re: Table_get() in set

              Hi All,

              My mistake, I have now found Dr Wayne's reference on page 108, and my memory had served me wrong. He does in fact use the table_get() method for his examples and that will be good enough for me and serve my purpose for the future.

              Michael

              Comment


              • #22
                Re: Table_get() in set

                For the sake of completion:
                Code:
                FUNCTION tbl_position AS N (Set_name AS C, Table_name AS C )
                	s_lst=TABLES_IN_SET(set_name)
                	if contains(s_lst,table_name+".dbf")=.f.
                		tbl_position=0
                	else	
                	s=set.open(set_name)
                	dim x as n=1
                	while table.current(x).name_get()<>table_name
                		x=x+1
                	end while
                        set.close()
                	tbl_position=x
                	end if	
                END FUNCTION

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