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FIBMiscellaneous.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:[email protected] }
{ }
{ Copyright (c) 1998-2013 Devrace Ltd. }
{ Written by Serge Buzadzhy ([email protected]) }
{ }
{ ------------------------------------------------------------- }
{ 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 FIBMiscellaneous;
interface
{$I FIBPlus.inc}
uses
{$IFDEF WINDOWS}
Windows, // For Inline functions
{$ENDIF}
SysUtils,SyncObjs, Classes, ibase,IB_Intf,IB_Externals,
DB, fib, FIBDatabase, FIBQuery, StdFuncs,IB_ErrorCodes,FIBPlatforms ;
const
DefaultBlobSegmentSize = High(Word);
type
(* TFIBBlobStream *)
TFIBBlobStream = class(TStream)
private
FDatabase:TFIBDatabase;
FTransaction:TFIBTransaction;
FUpdateTransaction:TFIBTransaction;
FBlobID: TISC_QUAD;
FBlobMaxSegmentSize, // Maximum segment size
FBlobNumSegments, // How many segments?
FBlobSize: Long; // Blob size
FOldBlobSize: Long;
FBlobType: Short; // 0 = segmented, 1 = streamed.
FBlobSubType: Long; // ivan_ra
FBuffer: PAnsiChar;
FOldBuffer: PAnsiChar;
FBlobInitialized: Boolean; // Has the blob been "opened" yet?
FBlobHandle: TISC_BLOB_HANDLE;
FMode: TBlobStreamMode; // (bmRead, bmWrite, bmReadWrite);
FModified: Boolean; // When finalize is called, does it need to do anything?
FPosition: Long; // The current position in the stream.
FBlobStreamList:TList;
FIndexInList:integer;
FFieldNo :integer;
FNeedSaveOldBuffer :boolean;
FTableName:Ansistring;
FFieldName:Ansistring;
FKeyValues:TDynArray;
FLoadedFromCache:boolean;
FIsClientField:boolean;
FCharSet:integer;
function GetUpdateTRHandle: PISC_TR_HANDLE;
function GetRecKeyValuesAsStr:string;
protected
procedure DoOnDatabaseFree(Sender:TObject);
procedure CreateBlob;
procedure EnsureBlobInitialized(CallBack:TCallBackBlobReadWrite=nil);
procedure GetBlobInfo;
function GetDatabase: TFIBDatabase;
function GetDBHandle: PISC_DB_HANDLE;
function GetTransaction: TFIBTransaction;
function GetUpdateTransaction: TFIBTransaction;
function GetTRHandle: PISC_TR_HANDLE;
procedure CheckHandles(ReadTransaction:boolean=True);
procedure OpenBlob(CallBack:TCallBackBlobReadWrite=nil);
procedure SetBlobID(const Value: TISC_QUAD);
procedure ReplaceBlobID(const Value: TISC_QUAD);
procedure SetDatabase(Value: TFIBDatabase);
procedure SetMode(Value: TBlobStreamMode);
procedure SetTransaction(Value: TFIBTransaction);
procedure SetUpdateTransaction(Value: TFIBTransaction);
function GetAsString: Ansistring;
function GetAsWideString: Widestring;
procedure SaveOldBuffer;
public
constructor CreateNew(aFieldNo:integer;aBlobStreamList:TList;
const aTableName:string = '';
const aFieldName:string = '';
PKeyValues:PDynArray=nil
);
constructor Create;
procedure InternalSetCharSet(Value:integer); // Internal Use only
destructor Destroy; override;
function Call(ErrCode: ISC_STATUS; RaiseError: Boolean): ISC_STATUS;
procedure CheckReadable;
procedure CheckWritable;
procedure DoFinalize(ClearModified, ForceWrite:Boolean;CallBack:TCallBackBlobReadWrite=nil);
procedure Finalize;
procedure CloseBlob;
procedure Cancel;
procedure FreeOldBuffer;
procedure DeInitialize;
function LoadFromFile(const Filename: string;IsCacheFile:boolean=False):boolean;
function LoadFromStream(Stream: TStream;IsCacheStream:boolean=False):boolean;
function Read(var Buffer; Count: Longint): Longint; override;
function ReadOldBuffer(var Buffer; Count: Longint): Longint;
function GenerateSwapFileName(ForceDir:boolean):string;
procedure SaveToSwapFile;
procedure SaveToFile(const Filename: string;FullInfo:boolean=False);
procedure SaveToStream(Stream: TStream;IsCacheStream:boolean=False);
function Seek(Offset: Longint; Origin: Word): Longint; override;
function DoSeek(Offset: Longint; Origin: Word;CallBack:TCallBackBlobReadWrite): Longint;
function SeekInOldBuffer(Offset: Longint; Origin: Word): Longint;
procedure SetSize(NewSize: Long); override;
procedure Truncate;
function Write(const Buffer; Count: Longint): Longint; override;
//For Big Blobs
function FileToBlob(const FileName:string;CallBack:TCallBackBlobReadWrite=nil):TISC_QUAD;
procedure BlobToFile(const FileName:string;CallBack:TCallBackBlobReadWrite=nil);
// properties
property BlobInitialized:boolean read FBlobInitialized;
property Handle: TISC_BLOB_HANDLE read FBlobHandle;
property BlobHandle: TISC_BLOB_HANDLE read FBlobHandle;
property BlobID: TISC_QUAD read FBlobID write SetBlobID;
property BlobMaxSegmentSize: Long read FBlobMaxSegmentSize;
property BlobNumSegments: Long read FBlobNumSegments;
property BlobSize: Long read FBlobSize;
property BlobType: Short read FBlobType;
property BlobSubType: Long read FBlobSubType write FBlobSubType; // ivan_ra
property Database: TFIBDatabase read GetDatabase write SetDatabase;
property DBHandle: PISC_DB_HANDLE read GetDBHandle;
property Mode: TBlobStreamMode read FMode write SetMode;
property Modified: Boolean read FModified;
property Transaction: TFIBTransaction read GetTransaction write SetTransaction;
property UpdateTransaction: TFIBTransaction read GetUpdateTransaction write SetUpdateTransaction;
property TRHandle: PISC_TR_HANDLE read GetTRHandle;
property UpdateTRHandle: PISC_TR_HANDLE read GetUpdateTRHandle;
property AsString:Ansistring read GetAsString;
property AsWideString:Widestring read GetAsWideString;
property FieldNo :integer read FFieldNo;
property IndexInList:integer read FIndexInList;
property FieldName:Ansistring read FFieldName write FFieldName;
property TableName:Ansistring read FTableName write FTableName;
property RecordKeyValues:TDynArray read FKeyValues write FKeyValues;
property IsClientField:boolean read FIsClientField write FIsClientField;
public
procedure SetMDTValue(AValue:pointer; ASize:integer);
end;
// Blob routine functions
TBlobInfo= record
NumSegments, MaxSegmentSize, TotalSize: Long;
BlobType :Short;
end;
function GetBlobInfoRec(DB:TFIBDatabase; TR:TFIBTransaction;blob_id : TISC_QUAD; var Success :boolean ):TBlobInfo;
procedure GetBlobInfo(ClientLibrary:IIbClientLibrary; hBlobHandle: PISC_BLOB_HANDLE;
var NumSegments, MaxSegmentSize, TotalSize: Long; var BlobType: Short);
procedure ReadBlob(ClientLibrary:IIbClientLibrary; hBlobHandle: PISC_BLOB_HANDLE; var Buffer: PAnsiChar;
var BlobSize: Long;CallBack:TCallBackBlobReadWrite=nil);
procedure WriteBlob(ClientLibrary:IIbClientLibrary; hBlobHandle: PISC_BLOB_HANDLE; Buffer: PAnsiChar;
BlobSize: Long;CallBack:TCallBackBlobReadWrite=nil);
function BlobExist(ClientLibrary:IIbClientLibrary; DBHandle:TISC_DB_HANDLE;
TRHandle:TISC_TR_HANDLE;blob_id : TISC_QUAD
):boolean;
function FileToBlob(const FileName:string;Database:TFIBDatabase;Transaction:TFIBTransaction;
cb: TCallBackBlobReadWrite
):TISC_QUAD;
procedure BlobToFile(BlobID:TISC_QUAD;const FileName:string;Database:TFIBDatabase;Transaction:TFIBTransaction;
cb: TCallBackBlobReadWrite
);
type
(* TFIBOutputDelimitedFile *)
TFIBFileOutputStream= class(TFIBBatchOutputStream)
protected
FFile:TFileStream;
FBuffer:PAnsiChar;
FBuffPos:integer;
procedure CloseFile;
procedure FlushBuf(Force:boolean; Count:integer);
function WriteValue(const ValBuffer; Count: Longint):Integer;
public
constructor Create;
destructor Destroy; override;
end;
TFIBOutputDelimitedFile = class(TFIBFileOutputStream)
protected
// FFile:TFileStream;
FOutputTitles: Boolean;
FColDelimiter,
FRowDelimiter: string;
st :string;
val: string;
procedure CloseFile;
{ procedure PrepareBuffer;
procedure FlushBuf(Force:boolean; Count:integer);
function WriteValue(const ValBuffer; Count: Longint):Integer;}
public
procedure ReadyStream; override;
function WriteColumns: Boolean; override;
property ColDelimiter: string read FColDelimiter write FColDelimiter;
property OutputTitles: Boolean read FOutputTitles
write FOutputTitles;
property RowDelimiter: string read FRowDelimiter write FRowDelimiter;
end;
(* TFIBInputDelimitedFile *)
TFIBInputDelimitedFile = class(TFIBBatchInputStream)
protected
FColDelimiter,
FRowDelimiter: string;
FEOF: Boolean;
FFile: TFileStream;
FLookAhead: Char;
FReadBlanksAsNull: Boolean;
FSkipTitles: Boolean;
public
destructor Destroy; override;
function GetColumn(var Col: AnsiString): Integer;
function ReadParameters: Boolean; override;
procedure ReadyStream; override;
property ColDelimiter: string read FColDelimiter write FColDelimiter;
property ReadBlanksAsNull: Boolean read FReadBlanksAsNull
write FReadBlanksAsNull;
property RowDelimiter: string read FRowDelimiter write FRowDelimiter;
property SkipTitles: Boolean read FSkipTitles write FSkipTitles;
end;
(* TFIBOutputRawFile *)
TFIBOutputRawFile = class(TFIBFileOutputStream)
public
constructor Create;
constructor CreateEx(aVersion:integer;const CharSet:string);
procedure ReadyStream; override;
function WriteColumns: Boolean; override;
end;
(* TFIBInputRawFile *)
TFIBInputRawFile = class(TFIBBatchInputStream)
protected
// FHandle: THandle;
FFile:TFileStream;
FMap:TList;
SkippedLen:array of integer;
procedure CloseFile;
public
destructor Destroy; override;
function ReadParameters: Boolean; override;
procedure ReadyStream; override;
end;
var
NullQUID:TISC_QUAD;
function EquelQUADs(const Value1,Value2:TISC_QUAD):boolean;
procedure ValidateBlobCacheDirectory(Database:TFIBDataBase);
implementation
uses
StrUtil,FIBDataSet,IBBlobFilter,FIBConsts
{$IFDEF MACOS}
,Posix.Unistd
{$ENDIF}
{$IFDEF D6+}
,Variants, pFIBProps
{$ENDIF}
;
function EquelQUADs(const Value1,Value2:TISC_QUAD):boolean;
begin
Result:=
(Value1.gds_quad_high=Value2.gds_quad_high)
and
(Value1.gds_quad_low=Value2.gds_quad_low)
end;
var
SwapVersion:integer=1;
BlobCacheSignature:Ansistring='FIB$BLOB_BODY';
BlobCacheOperation: TCriticalSection;
procedure DoValidateBlobCacheFile(Database:TFIBDataBase; Transaction:TFIBTransaction;const FileName:string);
var
Stream: TStream;
tmpStr:Ansistring;
tmpInt:integer;
tmpBlobId:TISC_QUAD;
vFileIsValid:boolean;
begin
vFileIsValid:=False;
BlobCacheOperation.Acquire;
try
Stream := TFileStream.Create(FileName, fmOpenRead);
try
Stream.Position := 0;
SetLength(tmpStr,Length(BlobCacheSignature));
Stream.Read(tmpStr[1],Length(BlobCacheSignature));
if tmpStr=BlobCacheSignature then
begin
Stream.Read(tmpInt,SizeOf(tmpInt));
if tmpInt=SwapVersion then
begin
Stream.Read(tmpBlobId,SizeOf(TISC_QUAD));
if not Transaction.DefaultDatabase.Connected then
Transaction.DefaultDatabase.Connected:=True;
if not Transaction.InTransaction then
Transaction.StartTransaction;
vFileIsValid:=
BlobExist(Database.ClientLibrary,
Database.Handle,Transaction.Handle,tmpBlobId
);
end;
end;
finally
Stream.Free;
end;
except
end;
try
if not vFileIsValid then
DeleteFile(FileName);
finally
BlobCacheOperation.Release;
end;
end;
procedure DoValidateBlobCacheDirectory(Database:TFIBDataBase; Transaction:TFIBTransaction; const Dir:string);
var
sr: TSearchRec;
FileAttrs: Integer;
begin
FileAttrs:=faAnyFile;
if FindFirst(Dir+'*.blb', FileAttrs, sr) = 0 then
begin
repeat
if (sr.Attr and FileAttrs) = sr.Attr then
begin
DoValidateBlobCacheFile(Database,Transaction,Dir+sr.Name);
end;
until FindNext(sr) <> 0;
FindClose(sr);
end;
FileAttrs:=faDirectory;
if FindFirst(Dir+'*', FileAttrs, sr) = 0 then
begin
repeat
if (sr.Attr and FileAttrs) = sr.Attr then
if (sr.Name<>'.') and (sr.Name<>'..') then
DoValidateBlobCacheDirectory(Database,Transaction,Dir+sr.Name+'\');
until FindNext(sr) <> 0;
FindClose(sr);
end;
end;
type
TValidateBlobCacheThread = class(TThread)
private
FDatabase:TFIBDataBase;
FTransaction:TFIBTransaction;
FCacheDir:string;
protected
procedure Execute; override;
public
constructor Create(Database:TFIBDataBase);
destructor Destroy; override;
end;
{ TValidateBlobCacheThread }
constructor TValidateBlobCacheThread.Create(Database: TFIBDataBase);
begin
FDatabase:=TFIBDatabase.Create(nil);
with FDatabase do
begin
if Database.IsRemoteConnect then
DBName :=Database.DBName
else
DBName :='localhost:'+Database.DBName;
DBParams:=Database.DBParams;
UseLoginPrompt:=False;
SynchronizeTime:=False;
Name:='dbValidateBlobCache';
LibraryName:=Database.LibraryName
// Connected:=True;
end;
FTransaction:=TFIBTransaction.Create(nil);
with FTransaction do
begin
DefaultDatabase:=FDatabase;
Name:='trValidateBlobCache';
TRParams.Add('read');
TRParams.Add('isc_tpb_nowait');
TRParams.Add('read_committed');
TRParams.Add('rec_version');
end;
FCacheDir:=Database.BlobSwapSupport.SwapDirectory;
FreeOnTerminate:=True;
inherited Create(False);
end;
destructor TValidateBlobCacheThread.Destroy;
begin
if FTransaction.InTransaction then
FTransaction.Commit;
FTransaction.Free;
FDatabase.Connected:=False;
FDatabase.Free;
inherited Destroy;
end;
procedure TValidateBlobCacheThread.Execute;
begin
DoValidateBlobCacheDirectory(FDatabase,FTransaction,FCacheDir);
end;
procedure ValidateBlobCacheDirectory(Database:TFIBDataBase);
begin
if not Assigned(Database) or not (Database.Connected)
or (Length(Database.BlobSwapSupport.SwapDirectory) = 0)
or not DirectoryExists(Database.BlobSwapSupport.SwapDirectory)
then
Exit;
TValidateBlobCacheThread.Create(Database);
end;
function GetBlobInfoRec(DB:TFIBDatabase;TR:TFIBTransaction; blob_id : TISC_QUAD;var Success :boolean ):TBlobInfo;
var
BlobHandle: TISC_BLOB_HANDLE;
begin
if not Assigned(DB) or not Assigned(TR) or not TR.Active then
begin
Success:=False; Exit;
end;
if not Assigned(DB.ClientLibrary) then
raise
EAPICallException.Create(Format(SUnknownClientLibrary,['GetBlobInfo']));
BlobHandle:=nil;
Success :=
DB.ClientLibrary.isc_open_blob2(
StatusVector, @DB.Handle, @TR.Handle, @BlobHandle,@blob_id, 0, nil)=0;
if Success then
with Result do
begin
GetBlobInfo(DB.ClientLibrary,@BlobHandle, NumSegments, MaxSegmentSize, TotalSize,BlobType);
DB.ClientLibrary.isc_close_blob(StatusVector,@BlobHandle)
end
else
FillChar(Result,SizeOf(Result),0);
end;
procedure GetBlobInfo(ClientLibrary:IIbClientLibrary; hBlobHandle: PISC_BLOB_HANDLE;
var NumSegments, MaxSegmentSize, TotalSize: Long; var BlobType: Short);
var
items: array[0..3] of AnsiChar;
results: array[0..99] of AnsiChar;
i, item_length: Integer;
item: Integer;
begin
if not Assigned(ClientLibrary) then
raise
EAPICallException.Create(Format(SUnknownClientLibrary,['GetBlobInfo']));
items[0] := AnsiChar(isc_info_blob_num_segments);
items[1] := AnsiChar(isc_info_blob_max_segment);
items[2] := AnsiChar(isc_info_blob_total_length);
items[3] := AnsiChar(isc_info_blob_type);
if ClientLibrary.isc_blob_info(StatusVector, hBlobHandle, 4, @items[0], SizeOf(results),
@results[0]) > 0 then
IBError(ClientLibrary,nil);
i := 0;
while (i < SizeOf(results)) and (results[i] <> AnsiChar(isc_info_end)) do
begin
item := Integer(results[i]); Inc(i);
item_length := ClientLibrary.isc_vax_integer(@results[i], 2); Inc(i, 2);
case item of
isc_info_blob_num_segments:
NumSegments := ClientLibrary.isc_vax_integer(@results[i], item_length);
isc_info_blob_max_segment:
MaxSegmentSize := ClientLibrary.isc_vax_integer(@results[i], item_length);
isc_info_blob_total_length:
TotalSize := ClientLibrary.isc_vax_integer(@results[i], item_length);
isc_info_blob_type:
BlobType := ClientLibrary.isc_vax_integer(@results[i], item_length);
end;
Inc(i, item_length);
end;
end;
procedure OldReadBlob(ClientLibrary:IIbClientLibrary; hBlobHandle: PISC_BLOB_HANDLE; var Buffer: PAnsiChar;
var BlobSize: Long;CallBack:TCallBackBlobReadWrite=nil);
var
BytesRead, SegLen: UShort;
LocalBuffer: PAnsiChar;
AllReadBytes:integer;
Stop:boolean;
begin
if not Assigned(ClientLibrary) then
raise
EAPICallException.Create(Format(SUnknownClientLibrary,['ReadBlob']));
LocalBuffer := Buffer;
if BlobSize<DefaultBlobSegmentSize then
SegLen:=BlobSize // Avoid IB2007 bug
else
SegLen := DefaultBlobSegmentSize;
AllReadBytes:=0;
Stop:=False;
while (AllReadBytes<BlobSize) do
begin
if (AllReadBytes + SegLen > BlobSize) then
SegLen :=BlobSize-AllReadBytes ;
if not ((ClientLibrary.isc_get_segment(
StatusVector, hBlobHandle, @BytesRead, SegLen,
LocalBuffer) = 0) or
(StatusVectorArray[1] = isc_segment)) then
IBError(ClientLibrary,nil);
Inc(LocalBuffer, BytesRead);
Inc(AllReadBytes,BytesRead);
if Assigned(CallBack) then
CallBack(BlobSize,AllReadBytes,Stop);
if Stop then
Exit;
end;
end;
procedure ReadBlob(ClientLibrary:IIbClientLibrary; hBlobHandle: PISC_BLOB_HANDLE; var Buffer: PAnsiChar;
var BlobSize: Long;CallBack:TCallBackBlobReadWrite=nil);
var
vBlobSize:Long;
BytesRead, SegLen: UShort;
LocalBuffer: PAnsiChar;
Stop:boolean;
begin
// Don't work correctly for FB1.5 local connect
if not Assigned(ClientLibrary) then
raise
EAPICallException.Create(Format(SUnknownClientLibrary,['ReadBlob']));
Stop:=False;
vBlobSize:=0;
LocalBuffer := Buffer;
while True do
begin
if vBlobSize=BlobSize then
SegLen:=0
else
if BlobSize<DefaultBlobSegmentSize then
SegLen:=BlobSize // Avoid IB2007 bug
else
SegLen := DefaultBlobSegmentSize;
case ClientLibrary.isc_get_segment(
StatusVector, hBlobHandle, @BytesRead, SegLen,
LocalBuffer) of
0,isc_segment:
begin
Inc(LocalBuffer, BytesRead);
Inc(vBlobSize,BytesRead);
if Assigned(CallBack) then
CallBack(BlobSize,vBlobSize,Stop);
if Stop then
Exit;
end;
isc_segstr_eof:
begin
if vBlobSize<BlobSize then
ReallocMem(Buffer,vBlobSize);
Inc(vBlobSize,BytesRead);
BlobSize:=vBlobSize;
if Assigned(CallBack) then
CallBack(BlobSize,vBlobSize,Stop);
Exit;
end
else
IBError(ClientLibrary,nil);
end;
end;
end;
procedure WriteBlob(ClientLibrary:IIbClientLibrary; hBlobHandle: PISC_BLOB_HANDLE; Buffer: PAnsiChar;
BlobSize: Long;CallBack:TCallBackBlobReadWrite=nil);
var
CurPos, SegLen: Long;
Stop:boolean;
begin
if not Assigned(ClientLibrary) then
raise
EAPICallException.Create(Format(SUnknownClientLibrary,['WriteBlob']));
Stop:=False;
CurPos := 0;
SegLen := DefaultBlobSegmentSize;
while (CurPos < BlobSize) do
begin
if (CurPos + SegLen > BlobSize) then
SegLen := BlobSize - CurPos;
if ClientLibrary.isc_put_segment(StatusVector, hBlobHandle, SegLen,
PAnsiChar(@Buffer[CurPos])) > 0 then
IBError(ClientLibrary,nil);
Inc(CurPos, SegLen);
if Assigned(CallBack) then
CallBack(BlobSize,CurPos,Stop);
if Stop then
begin
ClientLibrary.isc_cancel_blob(StatusVector, hBlobHandle);
Exit;
end;
end;
end;
function BlobExist(ClientLibrary:IIbClientLibrary; DBHandle:TISC_DB_HANDLE;
TRHandle:TISC_TR_HANDLE;blob_id : TISC_QUAD
):boolean;
var
BlobHandle: TISC_BLOB_HANDLE;
begin
if not Assigned(ClientLibrary) then
raise
EAPICallException.Create(Format(SUnknownClientLibrary,['BlobExist']));
BlobHandle:=nil;
Result:=
ClientLibrary.isc_open_blob2(
StatusVector, @DBHandle, @TRHandle, @BlobHandle,@blob_id, 0, nil)=0;
if Result then
ClientLibrary.isc_close_blob(StatusVector,@BlobHandle)
end;
function FileToBlob(const FileName:string;Database:TFIBDatabase;Transaction:TFIBTransaction;
cb: TCallBackBlobReadWrite
):TISC_QUAD;
var fs: TFIBBlobStream;
begin
fs := TFIBBlobStream.CreateNew(0, nil);
try
fs.Database := Database;
fs.Transaction := Transaction;
fs.Mode := bmReadWrite;
Result:=fs.FileToBlob(FileName,cb)
finally
fs.Free;
end;
end;
procedure BlobToFile(BlobID:TISC_QUAD;const FileName:string;Database:TFIBDatabase;Transaction:TFIBTransaction;
cb: TCallBackBlobReadWrite
);
var fs: TFIBBlobStream;
begin
fs := TFIBBlobStream.CreateNew(0, nil);
try
fs.Database := Database;
fs.Transaction := Transaction;
fs.Mode := bmRead;
fs.BlobID:=BlobID;
fs.BlobToFile(FileName,cb)
finally
fs.Free;
end;
end;
(* TFIBBlobStream *)
procedure TFIBBlobStream.DoOnDatabaseFree(Sender: TObject);
begin
FDatabase :=nil;
FTransaction:=nil;
end;
constructor TFIBBlobStream.CreateNew(aFieldNo:integer;aBlobStreamList:TList;
const aTableName:string='';
const aFieldName:string = '';
PKeyValues:PDynArray=nil
);
begin
inherited Create;
FCharSet :=-1;
FBuffer := nil;
FBlobSize := 0;
FOldBuffer := nil;
FOldBlobSize := 0;
FBlobInitialized:=false;
FBlobStreamList :=aBlobStreamList;
FFieldNo :=aFieldNo;
FNeedSaveOldBuffer :=True;
if Assigned(FBlobStreamList) then
FIndexInList:=FBlobStreamList.Add(Self);
FTableName:=aTableName;
FFieldName:=aFieldName;
if PKeyValues<>nil then
FKeyValues:=PKeyValues^
else
SetLength(FKeyValues,0);
end;
constructor TFIBBlobStream.Create;
begin
CreateNew(-1,nil)
end;
procedure TFIBBlobStream.InternalSetCharSet(Value:integer);
begin
FCharSet:=Value
end;
destructor TFIBBlobStream.Destroy;
begin
CloseBlob;
SetSize(0);
ReallocMem(FOldBuffer, 0);
FOldBuffer := nil;
FOldBlobSize := 0;
if Assigned(FBlobStreamList) then
with FBlobStreamList do
begin
begin
if FIndexInList<Count-1 then
begin
FBlobStreamList[FIndexInList]:=FBlobStreamList[Count-1];
TFIBBlobStream(FBlobStreamList[FIndexInList]).FIndexInList:=FIndexInList;
end;
Delete(Count-1)
end;
end;
inherited Destroy;
end;
function TFIBBlobStream.Call(ErrCode: ISC_STATUS; RaiseError: Boolean): ISC_STATUS;
begin
Result := 0;
if Transaction <> nil then
Result := Transaction.Call(ErrCode, RaiseError)
else
if RaiseError and (ErrCode > 0) then
IBError(FDatabase.ClientLibrary,Self);
end;
procedure TFIBBlobStream.CheckReadable;
begin
if FMode = bmWrite then FIBError(feBlobCannotBeRead, [nil]);
end;
procedure TFIBBlobStream.CheckWritable;
begin
if (FMode = bmRead) and not (IsClientField) then FIBError(feBlobCannotBeWritten, [nil]);
end;
procedure TFIBBlobStream.CloseBlob;
begin
if (FBlobHandle <> nil) and
(Call(FDatabase.ClientLibrary.isc_close_blob(StatusVector, @FBlobHandle), False) > 0) then
IBError(FDatabase.ClientLibrary,Self);
FBlobHandle:=nil;
FBlobInitialized:=false;
end;
procedure TFIBBlobStream.CreateBlob;
begin
CheckWritable;
FBlobID.gds_quad_high := 0;
FBlobID.gds_quad_low := 0;
Truncate;
end;
procedure TFIBBlobStream.EnsureBlobInitialized(CallBack:TCallBackBlobReadWrite=nil);
begin
if not FBlobInitialized then
if FIsClientField then
FBlobInitialized :=True
else
begin
case FMode of
bmWrite:
CreateBlob;
bmReadWrite:
begin
if (FBlobID.gds_quad_high = 0) and
(FBlobID.gds_quad_low = 0) then
CreateBlob
else
OpenBlob(CallBack);
end;
else
OpenBlob(CallBack);
end;
FBlobInitialized := True;
SaveToSwapFile;
end;
end;
{var
stream_bpb : array[0..2] of char = (Char(isc_bpb_version1),
Char(isc_bpb_type), Char(isc_bpb_type_stream)
);
}
procedure TFIBBlobStream.DoFinalize(ClearModified, ForceWrite:Boolean;CallBack:TCallBackBlobReadWrite=nil);
var
Temp:PAnsiChar;
SizeBeforeFilter:integer;
vFiltered:boolean;
begin
// ClearModified - don't need write. Change Cache to unmodified only
if (not FBlobInitialized) or (FMode = bmRead) or (not FModified and not ForceWrite) then
Exit;
FLoadedFromCache:=False;
if ClearModified then
begin
FNeedSaveOldBuffer:=True;
FModified := False;
Exit;
end;
CheckHandles(False);
// We need to start writing to a blob, so first create one.
Call(FDatabase.ClientLibrary.isc_create_blob2(StatusVector, DBHandle, UpdateTRHandle, @FBlobHandle,
@FBlobID, 0, nil), True);
vFiltered:=ExistBlobFilter(Database,FBlobSubType);
SizeBeforeFilter:=FBlobSize;
if vFiltered then
begin
Temp:=nil;
ReallocMem(Temp, FBlobSize);
Move(FBuffer[0], Temp[0], FBlobSize);
IBFilterBuffer(Database,FBuffer, FBlobSize, FBlobSubType, True);
end;
FIBMiscellaneous.WriteBlob(FDatabase.ClientLibrary,@FBlobHandle, FBuffer, FBlobSize,CallBack);
Call(FDatabase.ClientLibrary.isc_close_blob(StatusVector, @FBlobHandle), True);
if vFiltered then
begin
FBlobSize := SizeBeforeFilter;
FreeMem(FBuffer);
FBuffer :=Temp;
end;
if ClearModified then FModified := False;
end;
procedure TFIBBlobStream.Finalize;
begin
DoFinalize(False,False);
DoFinalize(True,False) ;
end;
procedure TFIBBlobStream.Cancel;
begin
if FBlobInitialized and Modified then
begin
SetSize(FOldBlobSize);
if FBlobSize>0 then
Move(FOldBuffer[0], FBuffer[0], FBlobSize);
FModified := False;
FNeedSaveOldBuffer:= True;
FreeMem(FOldBuffer);
FOldBuffer:=nil;
FOldBlobSize:=0;
end;
end;
procedure TFIBBlobStream.DeInitialize;
begin
FreeOldBuffer;
if FBlobSize>0 then
begin
SetSize(0);
FBlobInitialized:=False;
end;
end;
procedure TFIBBlobStream.FreeOldBuffer;
begin
if Assigned(FOldBuffer) then
begin
ReallocMem(FOldBuffer,0);
FOldBlobSize:=0;
end;
end;
procedure TFIBBlobStream.GetBlobInfo;
var
iBlobSize: Long;
begin
FIBMiscellaneous.GetBlobInfo(FDatabase.ClientLibrary,@FBlobHandle,
FBlobNumSegments, FBlobMaxSegmentSize, iBlobSize, FBlobType
);
SetSize(iBlobSize);
end;
function TFIBBlobStream.GetDatabase: TFIBDatabase;
begin
Result := FDatabase;
end;
function TFIBBlobStream.GetDBHandle: PISC_DB_HANDLE;
begin
if Assigned(FDatabase) and Assigned(FDatabase.Handle) then
Result := @FDatabase.Handle
else
Result :=nil;
end;
function TFIBBlobStream.GetTransaction: TFIBTransaction;
begin
Result := FTransaction;
end;
function TFIBBlobStream.GetUpdateTransaction: TFIBTransaction;
begin
if Assigned(FUpdateTransaction) then
Result := FUpdateTransaction
else
Result := FTransaction;
end;
function TFIBBlobStream.GetUpdateTRHandle: PISC_TR_HANDLE;
begin
if Assigned(FUpdateTransaction) then
Result := @FUpdateTransaction.Handle
else
Result := GetTRHandle
end;
function TFIBBlobStream.GetTRHandle: PISC_TR_HANDLE;
begin
if Assigned(FTransaction) and Assigned(FTransaction.Handle) then
Result := @FTransaction.Handle
else
Result := nil
end;
procedure TFIBBlobStream.CheckHandles(ReadTransaction:boolean=True);
begin
if (GetDBHandle=nil) then
begin
if not Assigned(Database) then
FIBError(feDatabaseNotAssigned, ['BlobStream'])
else
FIBError(feDatabaseClosed, ['BlobStream'])
end
else
if ReadTransaction then
begin
if (GetTRHandle=nil) then
begin
if not Assigned(Transaction) then
FIBError(feTransactionNotAssigned, ['BlobStream'])
else
FIBError(feNotInTransaction, ['BlobStream'])
end;
end
else
if (GetUpdateTRHandle=nil) then
begin
if not Assigned(FUpdateTransaction) then
FIBError(feTransactionNotAssigned, ['BlobStream'])
else
FIBError(feNotInTransaction, ['BlobStream'])
end;
end;
function TFIBBlobStream.LoadFromFile(const Filename: string;IsCacheFile:boolean=False):boolean;
var
Stream: TStream;