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FIBCacheManage.pas
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FIBCacheManage.pas
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{***************************************************************}
{ FIBPlus - component library for direct access to Firebird and }
{ InterBase databases }
{ }
{ FIBPlus is based in part on the product }
{ Free IB Components, written by Gregory H. Deatz for }
{ Hoagland, Longo, Moran, Dunst & Doukas Company. }
{ mailto:gdeatz@hlmdd.com }
{ }
{ Copyright (c) 1998-2013 Devrace Ltd. }
{ Written by Serge Buzadzhy (buzz@devrace.com) }
{ }
{ ------------------------------------------------------------- }
{ FIBPlus home page: http://www.fibplus.com/ }
{ FIBPlus support : http://www.devrace.com/support/ }
{ ------------------------------------------------------------- }
{ }
{ Please see the file License.txt for full license information }
{***************************************************************}
unit FIBCacheManage;
interface
uses SysUtils,pFIBLists,Classes,FIBPlatforms;
{$I FIBPlus.inc}
type
TBlockArray =array[0..0] of PByte;
PBlockArray =^TBlockArray;
TIntArray =array[1..1] of integer;
PIntArray =^TIntArray;
TRecordPosition = record
RecordNo :integer;
InternalNo:integer;
end;
PRecordPosition=^TRecordPosition;
TRecPositions = array[1..1] of TRecordPosition;
PRecPositions =^TRecPositions;
TRecordsCache = class
private
FMapRecords :TFIBList;
FStringData :TStringCollection;
FLogStringData :TStringCollection;
FBlocks :TFIBList;
FChangeLog :TFIBList;
FChangesPositions: PRecPositions;
FOldBufRecordNumber:integer;
FOldBuffer :TDataBuffer;
FBlockSize :integer;
FRecordSize :Integer;
FInOutRecordSize:integer;
FRecordCount :integer;
FChangesCount:integer;
FStringFieldOffsets :PIntArray;
FStringFieldSize :PIntArray;
FRecInBlock :Integer;
FStrFieldCount :Word;
FSaveChangeLog :boolean;
procedure SetBlockCount(NewCount: Integer);
function GetBlockCount:integer;
procedure SetChangeLogBlockCount(NewCount: Integer);
function InternalRecordNo(const RecordNo: integer):integer;
function GetSize: integer;
function GetChangePosition(aRecordNo: integer; Force:boolean):PRecordPosition;
// procedure ReadRecordBuffer(RecordNo:integer;var Dest:PChar;Old:boolean);
function FindChangeRecNo(const ARecno:integer; var Index:integer):boolean ;
procedure InitializeMap;
function GetChangesBlockCount: integer;
public
constructor Create(aBlockRecCount,aRecordSize,aBlockReadSize,aStrCount:integer);
destructor Destroy; override;
procedure Assign(SourceCache:TRecordsCache);
function CreateNewBlock:integer;
function PrepareMemory(RecordNo:integer):TDataBuffer;
function MemoryPrepared(RecordNo:integer):boolean;
function PRecBuffer(const RecordNo:integer; Old: boolean):TDataBuffer;
function RecordPosition(const RecordNo:integer;IsInternalRecno:boolean=False):integer;
function RecordBlock(const RecordNo:integer;ForceAllocMem: boolean;IsInternalRecno:boolean=False):integer;
procedure SetStrOffset(Index:integer;Offset,DataSize:integer);
function Capacity:integer;
procedure ReadRecord(const RecordNo:integer;var Dest:TDataBuffer);
procedure ReadRecordBuffer(RecordNo:integer;var Dest:TDataBuffer;Old:boolean);
function GetFieldData(RecordNo,FieldOffSet,StrIndex:integer;Var RecordData:Pointer):Pointer;
function GetStringFieldData(RecordNo,StrIndex:integer):Pointer;
function GetNonStringFieldData(RecordNo,FieldOffSet:integer;Var RecordData:Pointer):Pointer;
procedure ShiftMapValues(Distance:integer);
procedure WriteRecord(RecordNo:integer;const Source:TDataBuffer;ForceAllocMem: boolean);
procedure WriteField(RecordNo,FieldOffSet:integer;const Data:TDataBuffer;SizeData:integer);
procedure SetStringValue(Index,RecordNo:integer; const Value:string);
procedure SetStringFromPChar(Index,RecordNo:integer; const Value:PAnsiChar; Len:integer;Triming:boolean);
procedure SaveOldBuffer (RecordNo:integer);
procedure ClearOldBuffer;
procedure SaveToChangeLog(aRecordNo:integer);
function OldBuffer(RecordNo:integer):TDataBuffer;
function pRecBuff(RecordNo:integer):TDataBuffer;
procedure RevertRecord(aRecordNo:integer);
procedure ClearLog;
procedure SwapRecords(OldRecordNo,NewRecordNo:integer);
procedure MoveRecord(OldRecno,NewRecno:integer);
procedure SaveToStream(Stream:TStream; SeekBegin :boolean;CacheSize:integer=32*1024);
procedure LoadFromStream(Stream:TStream; SeekBegin :boolean );
procedure Insert(RecordNo:integer);
procedure CancelInsert(RecordNo:integer);
function BookMarkByRecord(RecordNo:integer):integer;
function RecordByBookMark(BookMark:integer):integer;
function BookMarkValid(BookMark:integer):boolean;
property ChangesBlockCount:integer read GetChangesBlockCount write SetChangeLogBlockCount;
public
property RecordSize:Integer read FRecordSize;
property BlockCount:integer read GetBlockCount write SetBlockCount;
property RecordCount:integer read FRecordCount;
property Size:integer read GetSize;
property SaveChangeLog :boolean read FSaveChangeLog write FSaveChangeLog;
end;
EMemManagerError=class(Exception);
const
MinBlockSize=1024;
implementation
uses StdFuncs,StrUtil;
{ TRecordsCache }
{$IFNDEF D6+}
type
PInteger=^Integer;
{$ENDIF}
constructor TRecordsCache.Create(aBlockRecCount,aRecordSize,aBlockReadSize,aStrCount:integer);
var
aBlockSize:integer;
begin
FOldBufRecordNumber:=-1;
FRecordSize :=aBlockReadSize;
FInOutRecordSize :=aRecordSize;
aBlockSize :=aBlockRecCount*FRecordSize ;
if aBlockSize<MinBlockSize then
aBlockSize:=MinBlockSize+ aRecordSize-(MinBlockSize mod aRecordSize);
if (aBlockSize < FRecordSize) then
raise EMemManagerError.Create('Incompatible Sizes');
FBlocks :=nil;
FBlocks :=TFIBList.Create;
FBlockSize :=aBlockSize;
FRecordCount:=0;
FRecInBlock :=FBlockSize div FRecordSize;
FLogStringData :=nil;
if aStrCount>0 then
begin
FStrFieldCount :=aStrCount;
FStringData :=TStringCollection.Create(aStrCount);
GetMem(FStringFieldOffsets , aStrCount * SizeOf(Integer));
GetMem(FStringFieldSize , aStrCount * SizeOf(Integer));
end
else
begin
FStrFieldCount :=0;
FStringData :=nil;
FStringFieldOffsets:=nil;
end;
GetMem(FOldBuffer , FInOutRecordSize);
if FInOutRecordSize>0 then
FillChar(FOldBuffer[0],FInOutRecordSize,1); // NullValues
FChangeLog :=nil;
FChangesPositions:=nil;
FChangesCount :=0;
FSaveChangeLog:=False;
FMapRecords :=nil;
end;
destructor TRecordsCache.Destroy;
var
i:integer;
begin
for i := 0 to BlockCount - 1 do
FreeMem(FBlocks.List^[i]);
for i := 0 to ChangesBlockCount - 1 do
FreeMem(FChangeLog.List^[i]);
ReallocMem(FStringFieldOffsets,0);
ReallocMem(FChangesPositions,0);
ReallocMem(FStringFieldSize,0);
FreeMem(FOldBuffer);
FStringData .Free;
FLogStringData .Free;
FBlocks .Free;
if FChangeLog<>nil then
FChangeLog .Free;
FMapRecords.Free;
inherited;
end;
procedure TRecordsCache.Assign(SourceCache: TRecordsCache);
var
i,j:integer;
ExistingBlockCount:integer;
ExistingCheckBlockCount:integer;
p:Pointer;
begin
if FBlockSize<>SourceCache.FBlockSize then
begin
for i := 0 to BlockCount - 1 do
begin
FreeMem(FBlocks.List^[i]);
end;
for i := 0 to ChangesBlockCount - 1 do
begin
FreeMem(FChangeLog.List^[i]);
end;
FBlocks.Clear;
if FChangeLog<>nil then
FChangeLog.Clear;
end;
if BlockCount>=SourceCache.BlockCount then
begin
for i := BlockCount-1 downto SourceCache.BlockCount do
FreeMem(FBlocks.List^[i]);
FBlocks.Count:=SourceCache.BlockCount;
ExistingBlockCount:=SourceCache.BlockCount
end
else
ExistingBlockCount:=BlockCount;
if ChangesBlockCount>=SourceCache.ChangesBlockCount then
begin
for i := ChangesBlockCount-1 downto SourceCache.ChangesBlockCount do
FreeMem(FChangeLog.List^[i]);
ExistingCheckBlockCount:=SourceCache.ChangesBlockCount
end
else
ExistingCheckBlockCount:=ChangesBlockCount;
FBlockSize:=SourceCache.FBlockSize;
FBlocks.Count:=SourceCache.BlockCount;
ChangesBlockCount:=SourceCache.ChangesBlockCount;
for i := 0 to BlockCount - 1 do
begin
if i>=ExistingBlockCount then
FBlocks.List^[i]:=nil;
if Assigned(FBlocks.List^[i]) then
begin
p:=FBlocks.List^[i];
ReallocMem(p,FBlockSize);
FBlocks.List^[i]:=p;
end
else
FBlocks.List^[i]:=AllocMem(FBlockSize);
Move(SourceCache.FBlocks.List^[i]^,FBlocks.List^[i]^,FBlockSize);
end;
for i := 0 to ChangesBlockCount - 1 do
begin
if i>=ExistingCheckBlockCount then FChangeLog.List^[i]:=nil;
p:=FChangeLog.List^[i];
ReallocMem(p,FBlockSize);
FChangeLog.List^[i]:=p;
Move(SourceCache.FChangeLog.List^[i]^,FChangeLog.List^[i]^,FBlockSize);
end;
FChangesCount:=SourceCache.FChangesCount;
ReallocMem(FChangesPositions,FChangesCount* SizeOf(TRecordPosition));
for i := 1 to FChangesCount do
begin
FChangesPositions^[i].RecordNo:=SourceCache.FChangesPositions^[i].RecordNo;
FChangesPositions^[i].InternalNo:=SourceCache.FChangesPositions^[i].InternalNo;
end;
FStrFieldCount :=SourceCache.FStrFieldCount;
ReallocMem(FStringFieldOffsets , FStrFieldCount * SizeOf(Integer));
ReallocMem(FStringFieldSize , FStrFieldCount * SizeOf(Integer));
FStringData.Free;
FLogStringData .Free;
if FStrFieldCount>0 then
begin
for i := 1 to FStrFieldCount do
begin
FStringFieldOffsets^[i]:=SourceCache.FStringFieldOffsets^[i];
FStringFieldSize^[i] :=SourceCache.FStringFieldSize^[i];
end;
FStringData :=TStringCollection.Create(FStrFieldCount);
FStringData.Capacity:=SourceCache.FStringData.Capacity;
for i := 0 to Pred(SourceCache.FStringData.HighX) do
for j := 0 to Pred(SourceCache.FStringData.CountY) do
begin
if i=0 then FStringData.Add;
FStringData[i,j]:=SourceCache.FStringData[i,j];
end;
if Assigned(SourceCache.FLogStringData) then
begin
FLogStringData:=TStringCollection.Create(FStrFieldCount);
FLogStringData.Capacity:=SourceCache.FLogStringData.Capacity;
for i := 0 to Pred(SourceCache.FLogStringData.HighX) do
for j := 0 to Pred(SourceCache.FLogStringData.CountY) do
begin
if i=0 then FLogStringData.Add;
FLogStringData[i,j]:=SourceCache.FLogStringData[i,j];
end;
end;
end
else
begin
FStringData:=nil;
FLogStringData:=nil;
end;
FInOutRecordSize:=SourceCache.FInOutRecordSize;
FRecordSize :=SourceCache.FRecordSize ;
FRecInBlock :=SourceCache.FRecInBlock ;
FRecordCount :=SourceCache.FRecordCount ;
ReallocMem(FOldBuffer , FInOutRecordSize);
end;
procedure TRecordsCache.SetBlockCount(NewCount: Integer);
begin
if NewCount>=FBlocks.Capacity then
FBlocks.Capacity:=NewCount+10;
FBlocks.Count:=NewCount
end;
function TRecordsCache.GetBlockCount:integer;
begin
Result:=FBlocks.Count
end;
function TRecordsCache.CreateNewBlock:integer;
begin
SetBlockCount(BlockCount+1);
FBlocks.List^[BlockCount-1]:=AllocMem(FBlockSize);
Result:=BlockCount;
end;
function TRecordsCache.MemoryPrepared(RecordNo:integer):boolean;
begin
if Assigned(FMapRecords) then
Result := (RecordNo<FMapRecords.Count)
else
Result := RecordNo<FRecordCount;
end;
function TRecordsCache.PrepareMemory(RecordNo:integer):TDataBuffer;
var
BlockNo:integer;
IRecordNo,i,c :integer;
begin
if Assigned(FMapRecords) and (RecordNo>FMapRecords.Count) then
begin
c:=FMapRecords.Count;
for i:=c to RecordNo-1 do
FMapRecords.Add(Pointer(FRecordCount+1+i-c));
FRecordCount:=FMapRecords.Count ;
if Assigned(FStringData) then
while (FStringData.CountY<FMapRecords.Count) do
FStringData.Add
end
else
if FRecordCount<RecordNo then FRecordCount:=RecordNo;
IRecordNo:=InternalRecordNo(RecordNo);
BlockNo:=(IRecordNo-1) div FRecInBlock;
if BlockNo=BlockCount then
CreateNewBlock;
Result:=TDataBuffer(FBlocks.List^[BlockNo])+RecordPosition(IRecordNo,True);
end;
function TRecordsCache.RecordPosition(const RecordNo: integer;IsInternalRecno:boolean=False): integer;
begin
if IsInternalRecno then
Result := ((RecordNo-1) mod FRecInBlock)*FRecordSize
else
Result := ((InternalRecordNo(RecordNo)-1) mod FRecInBlock)*FRecordSize
end;
function TRecordsCache.Capacity:integer;
begin
Result:= (FBlockSize div FRecordSize)*BlockCount;
end;
function TRecordsCache.RecordBlock(const RecordNo: integer;ForceAllocMem: boolean;IsInternalRecno:boolean=False): integer;
begin
if ForceAllocMem then
begin
PrepareMemory(RecordNo);
if (RecordNo>FRecordCount) then
FRecordCount:=RecordNo;
end;
if IsInternalRecno then
Result := (RecordNo-1) div FRecInBlock
else
Result := (InternalRecordNo(RecordNo)-1) div FRecInBlock;
end;
procedure TRecordsCache.ReadRecord(const RecordNo: integer; var Dest: TDataBuffer);
begin
ReadRecordBuffer(RecordNo, Dest,False);
end;
function TRecordsCache.PRecBuffer(const RecordNo:integer; Old: boolean):TDataBuffer;
var
BlockIndex:integer;
PosInBlock:integer;
IRecordNo:integer;
begin
IRecordNo:=InternalRecordNo(RecordNo);
BlockIndex:=RecordBlock(IRecordNo,False,True);
if BlockIndex>=BlockCount then
raise EMemManagerError.Create('Can''t read Buffer.Incorrect RecordNo');
PosInBlock:=RecordPosition(IRecordNo,True);
Result :=TDataBuffer(FBlocks.List^[BlockIndex])+PosInBlock;
end;
procedure TRecordsCache.ReadRecordBuffer(RecordNo: integer;
var Dest: TDataBuffer; Old: boolean);
var
BlockIndex:integer;
PosInBlock:integer;
Cache:TDataBuffer;
i,L:integer;
IRecordNo:integer;
p:PRecordPosition;
ss:TStringCollection;
ps:PFIBByteString;
begin
IRecordNo:=InternalRecordNo(RecordNo);
if Old then
begin
p:=GetChangePosition(IRecordNo,False);
if not Assigned(p) then
begin
ReadRecordBuffer(RecordNo, Dest,False);
Exit;
end;
IRecordNo:=p^.InternalNo;
ss:=FLogStringData;
BlockIndex:=(IRecordNo-1) div FRecInBlock;
if BlockIndex>=ChangesBlockCount then
raise EMemManagerError.Create('Can''t read LogBuffer.Incorrect RecordNo');
PosInBlock:= ((IRecordNo-1) mod FRecInBlock)*FRecordSize;
end
else
begin
ss:=FStringData;
BlockIndex:=RecordBlock(IRecordNo,False,True);
if BlockIndex>=BlockCount then
raise EMemManagerError.Create('Can''t read Buffer.Incorrect RecordNo');
PosInBlock:=RecordPosition(IRecordNo,True);
end;
if Old then
Cache:=TDataBuffer(FChangeLog.List^[BlockIndex])+PosInBlock
else
Cache:=TDataBuffer(FBlocks.List^[BlockIndex])+PosInBlock;
if (FStrFieldCount=0) then
Move(Cache^,Dest^,FRecordSize)
else
begin
Move(Cache[0],Dest[0],FStringFieldOffsets^[1]);
for i := 1 to FStrFieldCount do
begin
ps:=ss.PValue[i-1,IRecordNo-1];
if ps<>nil then
begin
L:=Length(ps^);
if L>FStringFieldSize^[i] then
begin
L:=FStringFieldSize^[i];
SetLength(ps^,L);
end;
PInteger(@Dest[FStringFieldOffsets^[i]])^:=L; // LengthExp
if (L>0) then
begin
Move(ps^[1],Dest[FStringFieldOffsets^[i]+SizeOf(Integer)],L);
end;
if L<FStringFieldSize^[i] then
{$IFDEF D2009+}
Dest[FStringFieldOffsets^[i]+L+SizeOf(Integer)]:=0;
{$ELSE}
Dest[FStringFieldOffsets^[i]+L+SizeOf(Integer)]:=#0;
{$ENDIF}
end;
end;
if FRecordSize>FStringFieldOffsets^[1] then //Blobs
Move(Cache[FStringFieldOffsets^[1]],
Dest[FStringFieldOffsets^[FStrFieldCount]+SizeOf(Integer)+FStringFieldSize^[FStrFieldCount]],
FRecordSize-FStringFieldOffsets^[1]
);
end;
end;
procedure TRecordsCache.WriteRecord(RecordNo: integer;
const Source: TDataBuffer; ForceAllocMem: boolean );
var
BlockIndex:integer;
PosInBlock:integer;
Cache:TDataBuffer;
L,i:integer;
ps:PFIBByteString;
begin
BlockIndex:=RecordBlock(RecordNo,ForceAllocMem);
if BlockIndex<BlockCount then
begin
PosInBlock:=RecordPosition(RecordNo);
Cache:=TDataBuffer(FBlocks.List^[BlockIndex])+PosInBlock;
if Source=nil then
FillChar(Cache^,FRecordSize,0)
else
begin
if (FStrFieldCount=0) then
Move(Source[0],Cache[0],FRecordSize)
else
begin
Move(Source[0],Cache[0],FStringFieldOffsets^[1]);
Move(Source[FStringFieldOffsets^[FStrFieldCount]+FStringFieldSize^[FStrFieldCount]+SizeOf(Integer)],
Cache[FStringFieldOffsets^[1]], FRecordSize-FStringFieldOffsets^[1]
);
end;
if Assigned(FStringData) then
begin
RecordNo:=InternalRecordNo(RecordNo);
for i := 1 to FStrFieldCount do
begin
if FStringData.CountY<=RecordNo then
FStringData.Add;
ps:=FStringData.PValue[i-1,RecordNo-1];
L:=PInteger(@Source[FStringFieldOffsets^[i]])^;
if L<>Length(ps^) then
SetLength(ps^,L);
if L>0 then
Move(Source[FStringFieldOffsets^[i]+SizeOf(Integer)],ps^[1],L);
end;
end
end;
end
else
raise EMemManagerError.Create('Can''t write to Buffer.Incorrect RecordNo');
end;
function TRecordsCache.InternalRecordNo(const RecordNo: integer): Integer;
begin
if Assigned(FMapRecords) then
if RecordNo<=FMapRecords.Count then
Result :=Integer(FMapRecords.List^[RecordNo-1])
else
Result := -1
else
Result :=RecordNo
end;
function TRecordsCache.GetSize: integer;
begin
Result:=BlockCount*FBlockSize;
end;
procedure TRecordsCache.SetStrOffset(Index, Offset,DataSize: integer);
begin
if Assigned(FStringFieldOffsets) and Assigned(FStringData )then
if (Index<=FStringData.HighX) and (Index>0) then
begin
FStringFieldOffsets^[Index]:=Offset;
FStringFieldSize^[Index] :=DataSize;
end;
end;
procedure TRecordsCache.WriteField(RecordNo, FieldOffSet: integer;
const Data: TDataBuffer; SizeData: integer);
var
BlockIndex:integer;
PosInBlock:integer;
Cache:TDataBuffer;
begin
BlockIndex:=RecordBlock(RecordNo,False);
if BlockIndex<BlockCount then
begin
PosInBlock:=RecordPosition(RecordNo);
Cache:=TDataBuffer(FBlocks.List^[BlockIndex])+PosInBlock+FieldOffSet;
if Data=nil then
FillChar(Cache^,SizeData,0)
else
Move(Data[0],Cache^,SizeData);
end
else
raise EMemManagerError.Create('Can''t write to Field to Buffer.Incorrect RecordNo');
end;
function TRecordsCache.GetStringFieldData(RecordNo,StrIndex:integer):Pointer;
begin
// used in new Locate
if Assigned(FMapRecords) then
RecordNo :=InternalRecordNo(RecordNo+1)-1;
if RecordNo>FStringData.Capacity then
raise EMemManagerError.Create('Can''t read FieldData .Incorrect RecordNo');
Result:=FStringData.PValue[StrIndex,RecordNo];
end;
function TRecordsCache.GetFieldData( RecordNo,FieldOffSet,StrIndex:integer;
var RecordData:Pointer ):Pointer;
var
BlockIndex:integer;
PosInBlock:integer;
begin
// Used in Locate
if Assigned(FMapRecords) then
RecordNo :=InternalRecordNo(RecordNo);
BlockIndex:=(RecordNo-1) div FRecInBlock;
if BlockIndex<FBlocks.Count then
begin
PosInBlock:=(RecordNo-1-BlockIndex*FRecInBlock)*FRecordSize;
RecordData:=FBlocks.List^[BlockIndex];
Inc(PByte(RecordData),PosInBlock);
end
else
raise EMemManagerError.Create('Can''t read FieldData .Incorrect RecordNo');
if (StrIndex=-1) or (FStrFieldCount=0) then
begin
Result:=RecordData;
Inc(PByte(Result),FieldOffSet);
end
else
begin
if RecordNo>FStringData.Capacity then
raise EMemManagerError.Create('Can''t read FieldData .Incorrect RecordNo');
Result:=FStringData.PValue[StrIndex,RecordNo-1];
end;
end;
function TRecordsCache.GetNonStringFieldData(RecordNo,FieldOffSet:integer;Var RecordData:Pointer):Pointer;
var
BlockIndex:integer;
PosInBlock:integer;
begin
// used in new Locate
if Assigned(FMapRecords) then
RecordNo :=InternalRecordNo(RecordNo+1)-1;
BlockIndex:=RecordNo div FRecInBlock;
if BlockIndex<FBlocks.Count then
begin
// PosInBlock:=(RecordNo mod FRecInBlock)*FRecordSize;
PosInBlock:=(RecordNo-BlockIndex*FRecInBlock)*FRecordSize;
RecordData:=FBlocks.List^[BlockIndex];
Inc(TDataBuffer(RecordData),PosInBlock)
end
else
raise EMemManagerError.Create('Can''t read FieldData .Incorrect RecordNo');
;
Result:=RecordData;
Inc(TDataBuffer(Result),FieldOffSet);
end;
procedure TRecordsCache.SetStringValue(Index, RecordNo: integer;
const Value: string);
var
i,L:integer;
Added:Boolean;
begin
if Assigned(FStringFieldOffsets) and Assigned(FStringData)then
begin
if Assigned(FMapRecords) then
RecordNo:=InternalRecordNo(RecordNo+1)-1;
Added:=FStringData.CountY<=RecordNo;
while FStringData.CountY<=RecordNo do
FStringData.Add;
L:= Length(Value);
if L=0 then
begin
if not Added then
FStringData.SetPCharValue(Index,RecordNo,'',0)
// FStringData.Value[Index,RecordNo]:=''
end
else
if FStringFieldSize^[Index+1]<L then
begin
// For char Fields
i:=FStringFieldSize^[Index+1];
while (i>0) and (Value[i]<=' ') do Dec(i);
{ if i<FStringFieldSize^[Index+1] then
begin
DoCopy(Value,FStringData.PValue[Index,RecordNo]^,1,i)
end
else}
FStringData.Value[Index,RecordNo]:=Value;
end
else
if (Value[L]=' ') then
FStringData.Value[Index,RecordNo]:=TrimRight(Value)
else
FStringData.Value[Index,RecordNo]:=Value
end;
end;
procedure TRecordsCache.SetStringFromPChar(Index,RecordNo:integer; const Value:PAnsiChar;
Len:integer; Triming:boolean
);
begin
if Assigned(FMapRecords) then
RecordNo:=InternalRecordNo(RecordNo+1)-1;
while FStringData.CountY<=RecordNo do
FStringData.Add;
if Triming then
begin
if Len<0 then
Len:=FStringFieldSize^[Index+1];
while (Len>0) and (Value[Len-1]=' ') do
Dec(Len);
if (Len<FStringFieldSize^[Index+1]) then
begin
Value[Len]:=#0;
end;
end;
FStringData.SetPCharValue(Index,RecordNo,Value,Len)
end;
function TRecordsCache.OldBuffer(RecordNo:integer): TDataBuffer;
begin
if SaveChangeLog then
begin
if RecordNo<=FRecordCount then
ReadRecordBuffer(RecordNo,FOldBuffer,True)
else
ClearOldBuffer
end
else
begin
if FOldBufRecordNumber<>RecordNo then
if RecordNo<=FRecordCount then
SaveOldBuffer(RecordNo)
else
ClearOldBuffer
end;
Result:=FOldBuffer
end;
procedure TRecordsCache.SaveOldBuffer(RecordNo: integer);
begin
if SaveChangeLog then
SaveToChangeLog(RecordNo)
else
begin
if RecordNo<=FRecordCount then
ReadRecord(RecordNo,FOldBuffer)
else
ClearOldBuffer;
FOldBufRecordNumber:=RecordNo;
end;
end;
procedure TRecordsCache.ClearOldBuffer;
begin
FillChar(FOldBuffer[0],FInOutRecordSize,1); // NullValues
end;
procedure TRecordsCache.SaveToChangeLog(aRecordNo: integer);
var
p:PRecordPosition;
BlockIndex:integer;
PosInBlock:integer;
ChangeBlockIndex:integer;
ChangePosInBlock:integer;
i:integer;
IRecordNo:integer;
begin
// for CachedUpdates
if FChangeLog=nil then
FChangeLog:=TFIBList.Create;
IRecordNo:=InternalRecordNo(aRecordNo);
BlockIndex:=RecordBlock(IRecordNo,False,True);
PosInBlock:=RecordPosition(IRecordNo,True);
p:=GetChangePosition(IRecordNo,True);
ChangeBlockIndex:=(p^.InternalNo-1) div FRecInBlock;
ChangePosInBlock:=((p^.InternalNo-1) mod FRecInBlock)*FRecordSize;
// if ((p^.InternalNo mod FRecInBlock)=1) and (BlockIndex>=ChangesBlockCount) then
if (ChangeBlockIndex>=ChangesBlockCount) then
begin
SetChangeLogBlockCount(ChangesBlockCount+1);
FChangeLog.List^[ChangesBlockCount-1]:=AllocMem(FBlockSize);
if Assigned(FStringData) and not Assigned(FLogStringData) then
FLogStringData :=TStringCollection.Create(FStrFieldCount);
end;
Move(TDataBuffer(FBlocks.List^[BlockIndex])[PosInBlock],TDataBuffer(FChangeLog.List^[ChangeBlockIndex])[ChangePosInBlock],FRecordSize);
if Assigned(FStringData) then
begin
if p^.InternalNo>=FLogStringData.CountY then FLogStringData.Add;
for I := 0 to FStringData.HighX-1 do
begin
FLogStringData.Value[i,p^.InternalNo-1]:=FStringData.Value[i,IRecordNo-1];
end;
end;
end;
procedure TRecordsCache.SetChangeLogBlockCount(NewCount: Integer);
begin
if FChangeLog=nil then FChangeLog:=TFIBList.Create;
FChangeLog.Count:=NewCount
end;
function TRecordsCache.GetChangePosition(aRecordNo: integer; Force:boolean): PRecordPosition;
var
i:integer;
begin
if FindChangeRecNo(aRecordNo,i) then
Result:=@FChangesPositions^[i]
else
if not Force then
Result := nil
else
begin
Inc(FChangesCount);
ReallocMem(FChangesPositions , FChangesCount * SizeOf(TRecordPosition));
Move(FChangesPositions[i],FChangesPositions[i+1],SizeOf(TRecordPosition)*(FChangesCount-i));
with FChangesPositions^[i] do
begin
RecordNo :=aRecordNo;
InternalNo:=FChangesCount;
Result :=@FChangesPositions^[i];
end;
end;
end;
procedure TRecordsCache.ClearLog;
var i:integer;
begin
if FChangeLog=nil then Exit;
for i := 0 to ChangesBlockCount - 1 do
begin
FreeMem(FChangeLog[i]);
end;
FChangeLog.Clear;
ReallocMem(FChangesPositions,0);
FChangesCount :=0
end;
function TRecordsCache.FindChangeRecNo(const ARecno:integer;
var Index: integer): boolean;
var
L, H, I, C: Integer;
function Compare(I,I1:integer):integer;
begin
if I=I1 then Result:=0 else
if I>I1 then Result:=1 else Result:=-1;
end;
begin
Result := False;
L := 1;
H := FChangesCount;
while L <= H do
begin
I := (L + H) shr 1;
C:=Compare(FChangesPositions[I].RecordNo,ARecno);
if C < 0 then
L := I + 1
else
begin
H := I - 1;
if C = 0 then
Result := True;
end;
end;
Index := L;
end;
procedure TRecordsCache.RevertRecord(aRecordNo: integer);
var
Buf:TDataBuffer;
begin
Buf:=OldBuffer(aRecordNo);
WriteRecord(aRecordNo,Buf,False)
end;
function TRecordsCache.pRecBuff(RecordNo: integer): TDataBuffer;
var
BlockIndex:integer;
PosInBlock:integer;
begin
BlockIndex:=RecordBlock(RecordNo,False);
if BlockIndex<BlockCount then
begin
PosInBlock:=RecordPosition(RecordNo);
Result := TDataBuffer(FBlocks.List^[BlockIndex])+PosInBlock;
end
else
Result := nil;
end;
procedure TRecordsCache.SwapRecords(OldRecordNo, NewRecordNo: integer);
var
c:Integer;
begin
InitializeMap;
c:=Integer(FMapRecords.List^[OldRecordNo]);
FMapRecords.List^[OldRecordNo]:=FMapRecords.List^[NewRecordNo];
FMapRecords.List^[NewRecordNo]:=Pointer(c);
end;
procedure TRecordsCache.MoveRecord(OldRecno,NewRecno:integer);
var
Position:integer;
begin
if OldRecno=NewRecno then
Exit;
if NewRecno>OldRecno then
Inc(NewRecno);
InitializeMap;
Position:=Integer(FMapRecords.List^[OldRecNo]);
FMapRecords.Insert(NewRecNo,Pointer(Position));
if OldRecNo<NewRecNo then
FMapRecords.Delete(OldRecno)
else
FMapRecords.Delete(OldRecno+1)
end;
{.$DEFINE REL}
{$IFDEF REL}
procedure TRecordsCache.SaveToStream(Stream: TStream; SeekBegin: boolean;CacheSize:integer=32*1024);
const
DefDelta:integer = 32*1024 ;
// DefDelta:integer = 0 ;
var
i,j,L:integer;
P:PFIBByteString;
sp:Int64;
begin
with Stream do
begin
if SeekBegin then Seek(0,soFromBeginning);
if (DefDelta>0) and (Size-Position<BlockCount*FBlockSize) then
begin
sp:=Position;
if FBlocks.Count*FBlockSize<DefDelta then
Size:=Size+DefDelta
else
Size:=Size+FBlocks.Count*FBlockSize;
Position:=sp; // For FileStream
end;
i:=BlockCount;
WriteBuffer(i,SizeOf(Integer));
WriteBuffer(FBlockSize ,SizeOf(Integer));
WriteBuffer(FInOutRecordSize ,SizeOf(Integer));
WriteBuffer(FStrFieldCount ,SizeOf(Integer));
WriteBuffer(FSaveChangeLog ,SizeOf(Boolean));
WriteBuffer(FRecordCount ,SizeOf(Integer));
for i := 0 to BlockCount - 1 do
WriteBuffer(FBlocks.List^[i]^,FBlockSize);