0c664731be
git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@1841 8e941d3f-bd1b-0410-a28a-d453659cc2b4
106 lines
3.5 KiB
ObjectPascal
106 lines
3.5 KiB
ObjectPascal
{ RxDBGrid sort engine module for FBDataSet
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Copyright (C) 2011 BugMaker from freepascal.ru
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This library is free software; you can redistribute it and/or modify it
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under the terms of the GNU Library General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at your
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option) any later version with the following modification:
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent modules,and
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to copy and distribute the resulting executable under terms of your choice,
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provided that you also meet, for each linked independent module, the terms
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and conditions of the license of that module. An independent module is a
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module which is not derived from or based on this library. If you modify
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this library, you may extend this exception to your version of the library,
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but you are not obligated to do so. If you do not wish to do so, delete this
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exception statement from your version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
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for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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}
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unit exsortsql;
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{$mode objfpc}{$H+}
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interface
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uses
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Classes, SysUtils, DB, RxDBGrid;
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type
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{ TSQLQuerySortEngine }
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TSQLQuerySortEngine = class(TRxDBGridSortEngine)
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public
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procedure Sort(Field:TField; ADataSet:TDataSet; Asc:boolean; SortOptions:TRxSortEngineOptions);override;
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end;
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implementation
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uses SQLDB, synRegExpr, strUtils;
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procedure TSQLQuerySortEngine.Sort(Field: TField; ADataSet: TDataSet;
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Asc: boolean; SortOptions: TRxSortEngineOptions);
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var cmd:string;
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strLen:Integer;
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RegExpr: TRegExpr;
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Mask:String;
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s:String;
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begin
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if Assigned(ADataSet) and ADataset.Active then begin
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cmd:=(ADataSet as TSQLQuery).SQL.Text;
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strlen:=length(cmd);
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//Регулярное выражение позволяет найти уже имеющуюся конструкцию ORDER BY,
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//если она написана одной строкой, и между словами не понапихали комментариев :)
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//Работоспособные примеры:
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//ORDER BY FIELD1, FIELD2 DESC, FIELD100500
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//oRdeR bY fielD1 , FiElD2,FieLD100500 DESC
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//Неработоспособный:
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//ORDER BY FIELD1,
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//FIELD2,
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//FIELD100500
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mask:='(?i)(^|\s)\s*order\s+by\s+\S+\.?\S*(\s+desc)?\s*(,\s*\S+\.?\S*(\s+desc)?(^|s*))*';
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with TRegExpr.Create do begin
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Expression := mask;
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if Exec(cmd) then begin
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s:=LeftStr(cmd,MatchPos[0]-1)
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+slinebreak+'order by '
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+Field.FieldName
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+' ';
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if not asc then s:=s+'DESC';
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s:=s+slineBreak
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+RightStr(cmd, strlen-MatchPos[0]-MatchLen[0]+1);
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end
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else
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begin
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s:=cmd+slinebreak+'order by '
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+Field.FieldName
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+' ';
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if not asc then s:=s+'DESC';
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s:=s+slineBreak
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end;
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ADataSet.Active:=False;
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(ADataSet as TSQLQuery).SQL.Text:=s;
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ADataSet.Active:=True;
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Free;
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end;
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end;
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end;
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initialization
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RegisterRxDBGridSortEngine(TSQLQuerySortEngine, TSQLQuery);
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end.
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