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;
其实很简单,在DBGRID的ONTITLECLICK事件中取得你点击的DBGRID的Column.FieldName然后你想怎么排序就怎么排序了,升序和降序交替都行例如;oraquery1.SQL.Text:='select * from DYNARRFLT '+sql+'order by '+Column.FieldName;然后执行就可以了
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;
用Adoquery或bdeClientDataset
我试过,可行
daoquery和bdeClientDataset可以在本地(内存中)做排序