多谢各位,这个问题我刚刚解决了。
我用的是DevExpress ExpressQuantumGrid Pro v3.2.1 Suite for Delphi6
中的TdxDBGrid控件,需要把egoLoadAllRecords属性加上,看了帮助才知道的。
不过,楼上的提供的代码我另外有用。
请各位接分!
欲实现点击DBGrid的Title对查询结果排序,想作一个通用程序,不是一事一议,
例如不能在SQL语句中增加Order by ...,因为SQL可能原来已经包含Order by ...,
而且点击另一个Title时又要另外排序,目的是想作到象资源管理器那样随心所欲。
procedure TFHkdata.SortQuery(Column:TColumn);
var
SqlStr,myFieldName,TempStr: string;
OrderPos: integer;
SavedParams: TParams;
begin
if not (Column.Field.FieldKind in [fkData,fkLookup]) then exit;
if Column.Field.FieldKind =fkData then
myFieldName := UpperCase(Column.Field.FieldName)
else
myFieldName := UpperCase(Column.Field.KeyFields);
while Pos(myFieldName,';')<>0 do
myFieldName := copy(myFieldName,1,Pos(myFieldName,';')-1)
+ ',' + copy(myFieldName,Pos(myFieldName,';')+1,100);
with TQuery(TDBGrid(Column.Grid).DataSource.DataSet) do
begin
SqlStr := UpperCase(Sql.Text);
// if pos(myFieldName,SqlStr)=0 then exit;
if ParamCount>0 then
begin
SavedParams := TParams.Create;
SavedParams.Assign(Params);
end;
OrderPos := pos('ORDER',SqlStr);
if (OrderPos=0) or
(pos(myFieldName,copy(SqlStr,OrderPos,100))=0) then
TempStr := ' Order By ' + myFieldName + ' Asc'
else if pos('ASC',SqlStr)=0 then
TempStr := ' Order By ' + myFieldName + ' Asc'
else
TempStr := ' Order By ' + myFieldName + ' Desc';
if OrderPos<>0 then SqlStr := Copy(SqlStr,1,OrderPos-1);
SqlStr := SqlStr + TempStr;
Active := False;
Sql.Clear;
Sql.Text := SqlStr;
if ParamCount>0 then
begin
Params.AssignValues(SavedParams);
SavedParams.Free;
end;
Prepare;
Open;
end;
end;
actSortAZ.Checked := False;
actSortZA.Checked := False;
if SortAZ then actSortAZ.Checked := True
else actSortZA.Checked := True;
ColumnToSort := id;
ListView1.AlphaSort
end;
procedure TFrmMain.ListView1ColumnClick(Sender: TObject;
Column: TListColumn);
begin
if ColumnToSort = Column.Index then
begin
if SortAZ then SortAZ:=False else SortAZ:=True;
end;
SortClick(Column.Index);
end;
procedure TFrmMain.ListView1Compare(Sender: TObject; Item1,
Item2: TListItem; Data: Integer; var Compare: Integer);
var
ix: Integer;
begin
if SortAZ then
begin
if ColumnToSort = 0 then
Compare := CompareText(Item1.Caption,Item2.Caption)
else begin
ix := ColumnToSort - 1;
Compare := CompareText(Item1.SubItems[ix],Item2.SubItems[ix]);
end
end else
begin
if ColumnToSort = 0 then
Compare := -CompareText(Item1.Caption,Item2.Caption)
else begin
ix := ColumnToSort - 1;
Compare := -CompareText(Item1.SubItems[ix],Item2.SubItems[ix]);
end
end;
end;