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Ttable question

Posted on 2004-09-28
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Last Modified: 2010-04-05
I placed a Ttable component in FORM1, then double click on the Ttable component. There is a  FORM1.Table1 that will pop-up, then i tried to create a new field.

The above procedure is done manually, how about if i will make that procedure above dynamic like having a source code to create a new field from the FORM1.table1.

How will i do that?
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Question by:girlswants_me
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7 Comments
 
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Expert Comment

by:SJohnson
ID: 12176937
A TTable is supposed to be linked to a database table.  It's not supposed to be just used as a stand alone component.   When you connect it to a TTable, it will automatically populate itself with the field values.

If you want to add a new calculated or lookup field to the Ttable, you can do that with the FieldDefs property (look in the help for FieldsDefs.Add).  It's quite easy to do.

Stu.
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Author Comment

by:girlswants_me
ID: 12177262
Hi Sjohnson,

Yes i can add field with my TTABLE even though without having a database table linked to it. Try this.
1. Double click on any Ttable component and a tool window will popup
2. Right click inside the tool window (Form1.Table1) and select "New Field..."
3. Now, a NEW FIELD dialog will come out. Place any values on the fields under NEW FIELD dialog.
4. You will now have a field inside the Form1.Table1 tool window.

Does FieldsDefs.add() method is the same as above?
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Author Comment

by:girlswants_me
ID: 12177273
And if FieldsDefs.add() is the same as what i did on the procedures, how can i assign a code inside the event OnGetTex(Sender: TField; var Text: String;  DisplayText: Boolean) ?

procedure TForm1.CurrencyGetText(Sender: TField; var Text: String;
  DisplayText: Boolean);
begin
 Text:='The value is ' + Sender.asstring;
end;
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LVL 1

Expert Comment

by:SJohnson
ID: 12177284
I'm just on my way home now, so I'll look at this more closely when I get home.

When you add the field definitions manually (through the IDE), can you actually populate those fields with data?  Do you set a TableName as well?  I've just never done it like this before (I guess I can't see why it won't work).

Stuart.
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LVL 12

Expert Comment

by:esoftbg
ID: 12177409
Note:
  AddFieldDef is only valid in the context of creating field definitions for a table to be created with a subsequent call to the CreateTable or CreateDataSet method. It cannot be used to add fields to an already-existing table.
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Accepted Solution

by:
esoftbg earned 125 total points
ID: 12177496
procedure TForm1.SpeedButtonCreateParadoxTableClick(Sender: TObject);
var
  S:      string;
begin
  S := ExtractFilePath(Application.ExeName) + 'SINGERS.DB';
  with Table1 do
  begin
    Active := False;
    DatabaseName := '';
    TableType := ttParadox;
    TableName := 'SINGERS';

    try
      { Don't overwrite an existing table }

      if not Table1.Exists then
      begin
        { The Table component must not be active }
        { First, describe the type of table and give }
        { it a name }
        { Next, describe the fields in the table }
        with FieldDefs do
        begin
          Clear;
          with AddFieldDef do
          begin
            Name := 'ID';
            DataType := ftAutoInc;
            Required := True;
          end;
          with AddFieldDef do
          begin
            Name := 'ALL_NAMES';
            DataType := ftString;
            Size := 32;
          end;
        end;
        { Next, describe any indexes }
        with IndexDefs do
        begin
          Clear;
          { The 1st index has no name because it is
          { a Paradox primary key }
          with AddIndexDef do
          begin
            Name := 'Primary_Key';
            Fields := 'ID';
            Options := [ixPrimary];
          end;
          with AddIndexDef do
          begin
            Name := 'ALL_NAMES_Indx';
            Fields := 'ALL_NAMES';
            Options := [ixCaseInsensitive];
          end;
        end;
        { Call the CreateTable method to create the table }
        CreateTable;
      end;
    finally
      Table1.Active := True;
    end;
  end;
end;
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Author Comment

by:girlswants_me
ID: 12177758
Thanks a lot.
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