new sort engine for TSQLQuery - thx BugMaker from FreePascal.ru

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@1841 8e941d3f-bd1b-0410-a28a-d453659cc2b4

components/rx/Demos/RxDBGrid/RxDBGridDemo.lpi

@@ -59,10 +59,12 @@
         <Filename Value="RxDBGridDemo.lpr"/>
         <IsPartOfProject Value="True"/>
         <UnitName Value="RxDBGridDemo"/>
+        <EditorIndex Value="1"/>
         <WindowIndex Value="0"/>
         <TopLine Value="1"/>
         <CursorPos X="5" Y="17"/>
         <UsageCount Value="53"/>
+        <Loaded Value="True"/>
       </Unit0>
       <Unit1>
         <Filename Value="rxdbgridmainunit.pas"/>
@@ -70,9 +72,10 @@
         <ComponentName Value="RxDBGridMainForm"/>
         <ResourceBaseClass Value="Form"/>
         <UnitName Value="RxDBGridMainUnit"/>
+        <IsVisibleTab Value="True"/>
         <EditorIndex Value="0"/>
         <WindowIndex Value="0"/>
-        <TopLine Value="1"/>
+        <TopLine Value="87"/>
         <CursorPos X="11" Y="9"/>
         <UsageCount Value="53"/>
         <Loaded Value="True"/>
@@ -393,8 +396,7 @@
       <Unit45>
         <Filename Value="/usr/local/share/lazarus/components/rxnew/rxdbgrid.pas"/>
         <UnitName Value="rxdbgrid"/>
-        <IsVisibleTab Value="True"/>
-        <EditorIndex Value="1"/>
+        <EditorIndex Value="2"/>
         <WindowIndex Value="0"/>
         <TopLine Value="2537"/>
         <CursorPos X="3" Y="2542"/>
@@ -522,7 +524,7 @@
       <Unit59>
         <Filename Value="/usr/local/share/lazarus/lcl/grids.pas"/>
         <UnitName Value="Grids"/>
-        <EditorIndex Value="2"/>
+        <EditorIndex Value="3"/>
         <WindowIndex Value="0"/>
         <TopLine Value="3866"/>
         <CursorPos X="1" Y="3891"/>
@@ -555,7 +557,7 @@
       </Unit62>
       <Unit63>
         <Filename Value="/usr/local/share/lazarus/lcl/include/canvas.inc"/>
-        <EditorIndex Value="3"/>
+        <EditorIndex Value="4"/>
         <WindowIndex Value="0"/>
         <TopLine Value="1116"/>
         <CursorPos X="1" Y="1132"/>

components/rx/exsortsql.pas

@@ -0,0 +1,105 @@
+{ 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(Field:TField; ADataSet:TDataSet; Asc:boolean; SortOptions:TRxSortEngineOptions);override;
+  end;
+
+implementation
+uses SQLDB, synRegExpr, strUtils;
+
+
+procedure TSQLQuerySortEngine.Sort(Field: TField; ADataSet: TDataSet;
+  Asc: boolean; SortOptions: TRxSortEngineOptions);
+var cmd:string;
+  strLen:Integer;
+  RegExpr: TRegExpr;
+  Mask:String;
+  s:String;
+begin
+  if Assigned(ADataSet) and ADataset.Active then begin
+    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 '
+        +Field.FieldName
+        +' ';
+        if not asc then s:=s+'DESC';
+        s:=s+slineBreak
+        +RightStr(cmd, strlen-MatchPos[0]-MatchLen[0]+1);
+      end
+      else
+      begin
+        s:=cmd+slinebreak+'order by '
+        +Field.FieldName
+        +' ';
+        if not asc then s:=s+'DESC';
+        s:=s+slineBreak
+      end;
+      ADataSet.Active:=False;
+      (ADataSet as TSQLQuery).SQL.Text:=s;
+      ADataSet.Active:=True;
+
+      Free;
+    end;
+  end;
+end;
+
+initialization
+  RegisterRxDBGridSortEngine(TSQLQuerySortEngine, TSQLQuery);
+end.

components/rx/rxdbgrid.pas

@@ -325,6 +325,7 @@ type
   { TRxDBGrid }
   TRxDBGrid = class(TCustomDBGrid)
   private
+    FSortingNow:Boolean;
     FInProcessCalc: integer;
     FAllowedOperations: TRxDBGridAllowedOperations;
     FFooterColor: TColor;
@@ -1932,8 +1933,10 @@ begin
     if SelectedRows.Count > 0 then
       SelectedRows.Clear;
   end;
-  FSortField := nil;
-  FSortOrder := smNone;
+  if not FSortingNow then begin
+    FSortField := nil;
+    FSortOrder := smNone;
+  end;
 
   F_SortListField.Clear;
   if not (csDestroying in ComponentState) and not (csDesigning in ComponentState) then
@@ -2080,8 +2083,10 @@ begin
       FSortField := AField;
       FSortOrder := smUp;
     end;
+    FSortingNow:=true;
     FSortEngine.Sort(FSortField, DataSource.DataSet, FSortOrder =
       smUp, SortEngineOptions);
+    FSortingNow:=false;
   end
   else
     HeaderClick(True, ACol);