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Tdataset lookup example

Posted on 2004-08-21
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Last Modified: 2010-04-05
I am looking for a usage example of the TDataset.lookup method (code snippet).  Thanks!
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Question by:billseven
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6 Comments
 
LVL 22

Accepted Solution

by:
Mohammed Nasman earned 252 total points
ID: 11862512
Hello

  First Paramter is the field you want to search in, second parameter the value, and last parameter the field that you want to have it's value based on search on first parameter

procedure TForm1.Button1Click(Sender: TObject);
var
 V : Variant;
begin
  V := Table1.Lookup('CustNo','1231','Company') ;
  ShowMessage(V);
end;

Remember, Lookup method doesn't move the Pointer to the found record, it's just give you the result, if you would like the pointer to move for the found record, use Located instead of it,

HTH

Regards,
Mohammed
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LVL 12

Assisted Solution

by:esoftbg
esoftbg earned 248 total points
ID: 11862818
download a working example from:
page:        http://www.geocities.com/esoftbg/
  link:        Q_21102337.zip

//....................................

procedure TForm1.Button1Click(Sender: TObject);
var
  V: Variant;
  C: Integer;
  A: String;
begin
  V := Table1.Lookup('Company;State', VarArrayOf(['Blue Sports', 'OR']), 'CustNo;Addr1');
  if (VarType(V) in [varNull]) then
    ShowMessage('Search unsuccessful !')
  else
  begin
    C := V[0];
    A := V[1];
    ShowMessage(IntToStr(C) + #10 + A);
  end;
end;
0
 
LVL 22

Expert Comment

by:Mohammed Nasman
ID: 13356440
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