//Select/Refresh

ADODataset1.Active := false;
ADODataset1.CommandText := 'select *  from Table_1';
ADODataset1.Active := true;

//Add

ADODataset1.Append;
ADODataset1.Fieldbyname('ID').Value := edit1.Text;

//Delete

ADODataset1.Delete;

//Update

ADODataset1.Edit;
ADODataset1.Fieldbyname('ID').Value := edit1.Text;
ADODataset1.Post;