135 lines
4.3 KiB
Plaintext
135 lines
4.3 KiB
Plaintext
{ RxDBGrid sort engine module for FBDataSet
|
|
|
|
Copyright (C) 2011 BugMaker from freepascal.ru
|
|
|
|
This library is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU Library General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or (at your
|
|
option) any later version with the following modification:
|
|
|
|
As a special exception, the copyright holders of this library give you
|
|
permission to link this library with independent modules to produce an
|
|
executable, regardless of the license terms of these independent modules,and
|
|
to copy and distribute the resulting executable under terms of your choice,
|
|
provided that you also meet, for each linked independent module, the terms
|
|
and conditions of the license of that module. An independent module is a
|
|
module which is not derived from or based on this library. If you modify
|
|
this library, you may extend this exception to your version of the library,
|
|
but you are not obligated to do so. If you do not wish to do so, delete this
|
|
exception statement from your version.
|
|
|
|
This program is distributed in the hope that it will be useful, but WITHOUT
|
|
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
|
|
for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public License
|
|
along with this library; if not, write to the Free Software Foundation,
|
|
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
}
|
|
|
|
unit exsortsql;
|
|
|
|
{$mode objfpc}{$H+}
|
|
|
|
interface
|
|
|
|
uses
|
|
Classes, SysUtils, DB, RxDBGrid;
|
|
|
|
type
|
|
|
|
{ TSQLQuerySortEngine }
|
|
|
|
TSQLQuerySortEngine = class(TRxDBGridSortEngine)
|
|
public
|
|
procedure Sort(FieldName: string; ADataSet:TDataSet; Asc:boolean; SortOptions:TRxSortEngineOptions);override;
|
|
procedure SortList(ListField: string; ADataSet: TDataSet; Asc: array of boolean; SortOptions: TRxSortEngineOptions); override;
|
|
end;
|
|
|
|
implementation
|
|
uses SQLDB, RegExpr, strUtils;
|
|
|
|
|
|
procedure TSQLQuerySortEngine.Sort(FieldName: string; ADataSet: TDataSet;
|
|
Asc: boolean; SortOptions: TRxSortEngineOptions);
|
|
begin
|
|
SortList(FieldName,ADataSet,Asc,SortOptions);
|
|
end;
|
|
|
|
procedure TSQLQuerySortEngine.SortList(ListField: string; ADataSet: TDataSet;
|
|
Asc: array of boolean; SortOptions: TRxSortEngineOptions);
|
|
var
|
|
S:string;
|
|
i, C:integer;
|
|
cmd:string;
|
|
strLen:Integer;
|
|
RegExpr: TRegExpr;
|
|
Mask:String;
|
|
OldParams:TParams;
|
|
begin
|
|
if not (Assigned(ADataSet) and ADataset.Active) then exit;
|
|
|
|
S:='';
|
|
C:=Pos(';', ListField);
|
|
i:=0;
|
|
while C>0 do
|
|
begin
|
|
if S<>'' then S:=S+',';
|
|
S:=S + Copy(ListField, 1, C-1);
|
|
Delete(ListField, 1, C);
|
|
|
|
if (i<=High(Asc)) and (not Asc[i]) then
|
|
S:=S + ' DESC';
|
|
C:=Pos(';', ListField);
|
|
inc(i);
|
|
end;
|
|
|
|
if ListField<>'' then
|
|
begin
|
|
if S<>'' then S:=S+',';
|
|
S:=S + ListField;
|
|
if (i<=High(Asc)) and (not Asc[i]) then
|
|
S:=S + ' DESC';
|
|
end;
|
|
|
|
OldParams:=TParams.Create;
|
|
OldParams.Assign((ADataSet as TSQLQuery).Params);
|
|
cmd:=(ADataSet as TSQLQuery).SQL.Text;
|
|
strlen:=length(cmd);
|
|
//Регулярное выражение позволяет найти уже имеющуюся конструкцию ORDER BY,
|
|
//если она написана одной строкой, и между словами не понапихали комментариев :)
|
|
//Работоспособные примеры:
|
|
//ORDER BY FIELD1, FIELD2 DESC, FIELD100500
|
|
//oRdeR bY fielD1 , FiElD2,FieLD100500 DESC
|
|
//Неработоспособный:
|
|
//ORDER BY FIELD1,
|
|
//FIELD2,
|
|
//FIELD100500
|
|
mask:='(?i)(^|\s)\s*order\s+by\s+\S+\.?\S*(\s+desc)?\s*(,\s*\S+\.?\S*(\s+desc)?(^|s*))*';
|
|
with TRegExpr.Create do begin
|
|
|
|
Expression := mask;
|
|
if Exec(cmd) then begin
|
|
s:=LeftStr(cmd,MatchPos[0]-1)
|
|
+slinebreak+'order by '
|
|
+s+slineBreak
|
|
+RightStr(cmd, strlen-MatchPos[0]-MatchLen[0]+1);
|
|
end
|
|
else
|
|
s:=cmd+slinebreak+'order by '+s+slineBreak;
|
|
|
|
ADataSet.Active:=False;
|
|
(ADataSet as TSQLQuery).SQL.Text:=s;
|
|
(ADataSet as TSQLQuery).Params.Assign(OldParams);
|
|
OldParams.Free;
|
|
ADataSet.Active:=True;
|
|
Free;
|
|
end;
|
|
|
|
end;
|
|
|
|
initialization
|
|
RegisterRxDBGridSortEngine(TSQLQuerySortEngine, 'TSQLQuery');
|
|
end.
|