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Grid & SQL

Posted on 2002-06-28
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Last Modified: 2010-04-04
I have a Grid that has been populated with information retrieved via a SQL query.

I want to be able to multi-select or use a check-box to select only the records I want to use.

When I have chosen my records I then need to find a way of sending only those records selected to a table.

Any ideas??
Thanks
0
Comment
Question by:HotRod40
  • 3
4 Comments
 
LVL 27

Expert Comment

by:kretzschmar
ID: 7115954
thats easy,

sample follows in some hours,
because i have a ready sample,
but just not here

therefore just some hints

set the rowselect and multiselect-options of the gris to true
after selection, iterate through the selected rows

meikl ;-)
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 7116245
here it comes,
sorry its not commented/explained

just ask, if unclear

two grids, where the selected rows are transfered to another table

unit uebertrag_u;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  DBTables, Grids, DBGrids, Db, ExtCtrls, ComCtrls, Buttons, DBCtrls,
  StdCtrls;

type
  TUForm = class(TForm)
    QSource: TQuery;
    DSSource: TDataSource;
    DDest: TDBGrid;
    TDest: TTable;
    DSDest: TDataSource;
    DSource: TDBGrid;
    Sp: TSplitter;
    Panel1: TPanel;
    StatusBar: TStatusBar;
    DBN: TDBNavigator;
    UB: TSpeedButton;
    CB: TComboBox;
    In1: TEdit;
    In2: TEdit;
    Label1: TLabel;
    RR: TSpeedButton;
    SBUP: TSpeedButton;
    SBDN: TSpeedButton;
    TDestTmp: TTable;
    procedure SpMoved(Sender: TObject);
    procedure UBClick(Sender: TObject);
    procedure RRClick(Sender: TObject);
    procedure DSourceKeyPress(Sender: TObject; var Key: Char);
    procedure FormResize(Sender: TObject);
    procedure SBUPClick(Sender: TObject);
    procedure SBDNClick(Sender: TObject);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  UForm: TUForm;

implementation

{$R *.DFM}

procedure TUForm.SpMoved(Sender: TObject);
begin
  If Sp.left - UB.Width > 0 Then
    UB.Left := Sp.left - (UB.Width div 2)
  else
    UB.Left := 0;
end;

procedure TUForm.UBClick(Sender: TObject);
var i,j : Integer;
begin
  if DSource.SelectedRows.Count > 0 then
  begin
    for j := 0 to DSource.SelectedRows.Count - 1 do
    begin
      QSource.GotoBookmark(TBookMark(DSource.SelectedRows.Items[J]));
      TDest.Append;
      For i := 0 to QSource.FieldCount - 1 do
        TDest.Fields[i] := QSource.Fields[I];
      TDest.Post;
    end;
  end;
end;



procedure TUForm.RRClick(Sender: TObject);
const SQLs = 'select name, adrl1, street, zip, city, state from adressen';
var s : String;
begin
  QSource.DisableControls;
  QSource.Active := False;
  QSource.SQL.Clear;
  If CB.Text = '' Then S := ''
  else
    s := ' where '+CB.Text+' between "'+In1.Text+'" and "'+In2.Text+'"';
  QSource.SQL.Add(SQLs+s);
  Try
    QSource.Active := True;
  except
    Showmessage('Eingabefehler ! Startzustand wird wieder hergestellt ! Statement = '+SQLs+S);
    QSource.Active := False;
    QSource.SQL.Clear;
    QSource.SQL.Add(SQLs);
    QSource.Active := True;
  end;
  QSource.EnableControls;
end;

procedure TUForm.DSourceKeyPress(Sender: TObject; var Key: Char);
begin
  If Key = #13 then UBClick(Self);
end;

procedure TUForm.FormResize(Sender: TObject);
begin
  SBUP.Left := DBN.Left - 50;
  SBDN.Left := DBN.Left - 25;
end;

procedure TUForm.SBUPClick(Sender: TObject);
var i : Integer;
begin
  TDestTmp.GotoCurrent(TDest);
  TDestTmp.Prior;
  TDestTmp.Insert;
  For i := 0 to TDest.FieldCount - 1 do
    TDestTmp.Fields[i] := TDest.Fields[I];
  TDest.Delete;
  TDest.GotoCurrent(TDestTmp);
end;

procedure TUForm.SBDNClick(Sender: TObject);
var i : Integer;
begin
  TDestTmp.GotoCurrent(TDest);
  TDestTmp.Next;
  TDestTmp.Next;
  If not TDestTmp.EOf then
  begin
    TDestTmp.Insert;
    For i := 0 to TDest.FieldCount - 1 do
      TDestTmp.Fields[i] := TDest.Fields[I];
    TDest.Delete;
    TDest.GotoCurrent(TDestTmp);
  end;
end;

end.


hope this helps

meikl ;-)
0
 
LVL 27

Accepted Solution

by:
kretzschmar earned 75 total points
ID: 7116403
just to point out what you need, i guess

procedure TUForm.UBClick(Sender: TObject);
var i,j : Integer;
begin
 if DSource.SelectedRows.Count > 0 then
 begin
   for j := 0 to DSource.SelectedRows.Count - 1 do
   begin
     QSource.GotoBookmark(TBookMark(DSource.SelectedRows.Items[J]));
     TDest.Append;
     For i := 0 to QSource.FieldCount - 1 do
       TDest.Fields[i] := QSource.Fields[I];
     TDest.Post;
   end;
 end;
end;


meikl ;-)
0
 

Author Comment

by:HotRod40
ID: 7121806
Thanks but theres one more thing.

I want to be able to update a field but only with the records that have been selected.
How can I do this?

I have tried your example above and it works great with a Select SQL query. I have tried it with an Update SQL query and it says the dataset is not open even though I have actually called the ExecSQL command.

Can I not use an Update within this loop that you have demonstrated for me??

Thanks
Scott
0

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