Question

comparing records in a database

Asked by: npepper

Before i start thanks to the person who kindly assisted me with my last question.

I am trying to write a procedure that uses findkey to locate a record that part is ok, i then need to however compare the fields with the last record i went to and if there is a difference perform another procedure.

I am able to use findkey and assign the fields i need to compare to variables.  However i need to be able to compare these variables to the last record i did findkey on.

procedure Tproductionfrm.M1Pending; {checks for pending jobs in schedule}
var
  IsColorChange: Boolean;
  IsEndOfRun: Boolean;
  ColorToTest: String;
  ProductToTest: String;
begin
  IsColorChange:= False;
  IsEndOfRun:= False;
  with scheduler.SchT do
     begin
        Open;
        Edit;
        First;
           if FindKey(['Machine 1', 'P']) then {Pending}
           begin
              ProductToTest:=scheduler.SchT.Fields[3].AsString; {product for selected record}
              ColorToTest:=scheduler.SchT.Fields[4].AsString; {colour for selected record}
           end;

     end;
end;

This is the basics at the moment and i have yet to perform any comparison.

any clues?

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Asked On
1998-10-01 at 05:56:56ID10085270
Tags

comparing

,

findkey

,

records

Topic

Delphi Programming

Participating Experts
1
Points
100
Comments
1

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Answers

 

by: chrismoPosted on 1998-10-01 at 06:05:34ID: 1341419

I would say set up two additional variables that store the previous value:

var
  LastProductToTest: string;
  LastColorToTest: string;
begin
  ProductToTest := ...
  ColorToTest := ...

  if (ProductToTest <> LastProductToTest)
     or
     (ColorToTest <> LastColorToTest) then
    DoOtherMethod;

  LastProductToTest := ProductToTest;
  LastColorToTest := ColorToTest;
end;

20120131-EE-VQP-002

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