[函数]procedure SortDBGridEh(Sender: TObject; ACol: Integer; Column: TColumnEh);

//
// 使用说明：单击DBGridEh的标题栏排序（适用于ADO）
// --在DBGridEh的事件OnTitleBtnClick引用该函数即可：
// SortDBGridEh(Sender, ACol, Column);
// --为了保证表格的每一列都能点击触发排序，你需要将你需要排序的列属性
// -- Title->TitleButton设置为True。
//
procedure SortDBGridEh(Sender: TObject; ACol: Integer; Column: TColumnEh);
var
FieldName, SortStr: string;
begin
Screen.Cursor := crSQLWait;
try
if (Sender is TDBGridEh) and
((Sender as TDBGridEh).DataSource.DataSet <> nil) then
begin
if not ((Sender as TDBGridEh).DataSource.DataSet is
TCustomADODataSet) then
Exit;
if not (Sender as TDBGridEh).DataSource.DataSet.Active then
Exit;
FieldName := Column.FieldName;
if (Sender as
TDBGridEh).DataSource.DataSet.FindField(FieldName).IsBlob then
Exit;
if (Sender as
TDBGridEh).DataSource.DataSet.FieldByName(FieldName).FieldKind =
fkData then
SortStr := FieldName
else if (Sender as
TDBGridEh).DataSource.DataSet.FieldByName(FieldName).FieldKind =
fkLookup then
FieldName := (Sender as TDBGridEh).DataSource.DataSet.FieldByName
(FieldName).KeyFields
else
FieldName := '''''''';
if (FieldName = '''''''') or (Pos('''';'''', FieldName) > 0) then
Exit;
case Column.Title.SortMarker of
smNoneEh:
begin
Column.Title.SortMarker := smUpEh;
TCustomADODataSet((Sender as
TDBGridEh).DataSource.DataSet).Sort :=
FieldName;
end;
smUpEh:
begin
Column.Title.SortMarker := smDownEh;
TCustomADODataSet((Sender as
TDBGridEh).DataSource.DataSet).Sort :=
FieldName '''' DESC'''';
end;
smDownEh:
begin
Column.Title.SortMarker := smNoneEh;
TCustomADODataSet((Sender as
TDBGridEh).DataSource.DataSet).Sort := '''''''';
end;
end;
end;
finally
Screen.Cursor := crDefault;
end;
end;

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