DBGrid order by titleclick

Hi,

I've got a DBGrid, it gets data through a query from an SQL server, and I want to change the "order by" in the query's SQL statement, when the user clicks on the title of a column.
somebody pls paste some rows here to make this thing work.
thx in advance

G
LVL 1
thegrooverAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

kretzschmarCommented:
from my paq:

a sample

unit sortquery_u;

interface

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

type
  TForm1 = class(TForm)
    Query1: TQuery;
    DataSource1: TDataSource;
    Panel1: TPanel;
    Panel2: TPanel;
    DBNavigator1: TDBNavigator;
    DBGrid1: TDBGrid;
    UpdateSQL1: TUpdateSQL;
    procedure Query1AfterPost(DataSet: TDataSet);
    Procedure SortQuery(FieldNo : Integer; SortOrder : Boolean);
    procedure FormCreate(Sender: TObject);
    procedure DBGrid1TitleClick(Column: TColumn);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

const
  mysql = 'Select * from Address order by ';
  ToSort : Array [False..True] of String[5] = (' DESC',' ASC');

var
  NoField : Integer = 0;  //FieldNumber to Sort
  SortAsc : Boolean = True; //SortOrder True-Ascending,False-Descending


{$R *.DFM}


Procedure TForm1.SortQuery(FieldNo : Integer; SortOrder : Boolean);
var
  s : String;
  Fields : String;
  Values : Variant;
  I : Integer;
begin
  Screen.Cursor := crSQLWait;
  query1.DisableControls;
  s := mySQL+query1.Fields[FieldNo].FieldName+ToSort[SortOrder];
  Fields := '';
  Values := VarArrayCreate([0,query1.FieldCount-1],VarVariant);
  for I := 0 to query1.FieldCount - 1 do  //Remember Current Record
  begin
    Fields := Fields+query1.Fields[I].FieldName+';';
    Values[i] := query1.Fields[I].Value;
  end;
  Delete(Fields,Length(Fields),1);
  query1.Close;
  query1.Sql.Clear;
  query1.Sql.Text := s;
  query1.Open;
  query1.Locate(Fields,Values,[]);  //Goto to Current Record
  query1.EnableControls;
  Screen.Cursor := crDefault;
end;

procedure TForm1.Query1AfterPost(DataSet: TDataSet);
begin
  query1.ApplyUpdates;
  query1.CommitUpdates;
  SortQuery(NoField,SortAsc);
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  query1.Open;
  SortQuery(NoField,SortAsc);
end;

procedure TForm1.DBGrid1TitleClick(Column: TColumn);
begin
  if Column.Field.FieldNo - 1= NoField then
    SortAsc := Not(SortAsc)
  else
  begin
    SortAsc := True;
    NoField := Column.Field.FieldNo - 1;
  end;
  SortQuery(NoField,SortAsc);
end;

end.

meikl ;-)

0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
thegrooverAuthor Commented:
thanks, all i need was column.field.fieldno :)

G
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Delphi

From novice to tech pro — start learning today.