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(*
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* Firebird Interface (fbintf). The fbintf components provide a set of
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* Pascal language bindings for the Firebird API. Although predominantly
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* a new development they include source code taken from IBX and may be
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* considered a derived product. This software thus also includes the copyright
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* notice and license conditions from IBX.
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*
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* Except for those parts dervied from IBX, contents of this file are subject
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* to the Initial Developer's Public License Version 1.0 (the "License"); you
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* may not use this file except in compliance with the License. You may obtain a
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* copy of the License here:
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*
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* http://www.firebirdsql.org/index.php?op=doc&id=idpl
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing rights
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* and limitations under the License.
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*
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* The Initial Developer of the Original Code is Tony Whyman.
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*
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* The Original Code is (C) 2016 Tony Whyman, MWA Software
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* (http://www.mwasoftware.co.uk).
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*
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* All Rights Reserved.
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*
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* Contributor(s): ______________________________________.
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*
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*)
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{************************************************************************}
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{ }
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{ Borland Delphi Visual Component Library }
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{ InterBase Express core components }
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{ }
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{ Copyright (c) 1998-2000 Inprise Corporation }
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{ }
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{ InterBase Express is based in part on the product }
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{ Free IB Components, written by Gregory H. Deatz for }
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{ Hoagland, Longo, Moran, Dunst & Doukas Company. }
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{ Free IB Components is used under license. }
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{ }
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{ The contents of this file are subject to the InterBase }
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{ Public License Version 1.0 (the "License"); you may not }
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{ use this file except in compliance with the License. You }
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{ may obtain a copy of the License at http://www.Inprise.com/IPL.html }
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{ Software distributed under the License is distributed on }
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{ an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either }
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{ express or implied. See the License for the specific language }
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{ governing rights and limitations under the License. }
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{ The Original Code was created by InterBase Software Corporation }
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{ and its successors. }
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{ Portions created by Inprise Corporation are Copyright (C) Inprise }
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{ Corporation. All Rights Reserved. }
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{ Contributor(s): Jeff Overcash }
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{ }
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{ IBX For Lazarus (Firebird Express) }
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{ Contributor: Tony Whyman, MWA Software http://www.mwasoftware.co.uk }
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{ Portions created by MWA Software are copyright McCallum Whyman }
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{ Associates Ltd 2011 - 2015 }
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{ }
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{************************************************************************}
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unit FB25Transaction;
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{$IFDEF MSWINDOWS}
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{$DEFINE WINDOWS}
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{$ENDIF}
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{$IFDEF FPC}
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{$mode delphi}
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{$interfaces COM}
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{$ENDIF}
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{$R-}
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interface
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uses
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Classes, SysUtils, IB, FBClientAPI, FB25ClientAPI, IBHeader,
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FB25Attachment, FBActivityMonitor, FBTransaction;
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type
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{ TFB25Transaction }
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TFB25Transaction = class(TFBTransaction,ITransaction, IActivityMonitor)
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private
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FHandle: TISC_TR_HANDLE;
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FFirebird25ClientAPI: TFB25ClientAPI;
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protected
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function GetActivityIntf(att: IAttachment): IActivityMonitor; override;
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function GetTrInfo(ReqBuffer: PByte; ReqBufLen: integer): ITrInformation; override;
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procedure SetInterface(api: TFBClientAPI); override;
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procedure InternalStartSingle(attachment: IAttachment); override;
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procedure InternalStartMultiple; override;
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procedure InternalCommit(Force: boolean); override;
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procedure InternalRollback(Force: boolean); override;
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procedure InternalCommitRetaining; override;
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procedure InternalRollbackRetaining; override;
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public
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property Handle: TISC_TR_HANDLE read FHandle;
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public
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{ITransaction}
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function GetInTransaction: boolean; override;
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procedure PrepareForCommit; override;
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end;
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implementation
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uses FBMessages, FBParamBlock;
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{ TFB25Transaction }
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function TFB25Transaction.GetActivityIntf(att: IAttachment): IActivityMonitor;
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begin
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Result := (att as TFB25Attachment);
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end;
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function TFB25Transaction.GetTrInfo(ReqBuffer: PByte; ReqBufLen: integer
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): ITrInformation;
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begin
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Result := TTrInformation.Create(FFirebird25ClientAPI);
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with FFirebird25ClientAPI, Result as TTrInformation do
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if isc_transaction_info(StatusVector, @(FHandle), ReqBufLen, ReqBuffer,
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getBufSize, Buffer) > 0 then
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IBDataBaseError;
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end;
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procedure TFB25Transaction.SetInterface(api: TFBClientAPI);
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begin
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inherited SetInterface(api);
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FFirebird25ClientAPI := api as TFB25ClientAPI;
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OnDatabaseError := FFirebird25ClientAPI.IBDataBaseError;
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end;
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procedure TFB25Transaction.InternalStartSingle(attachment: IAttachment);
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var db_handle: TISC_DB_HANDLE;
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begin
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with FFirebird25ClientAPI do
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try
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db_handle := (attachment as TFB25Attachment).Handle;
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Call(isc_start_transaction(StatusVector, @FHandle,1,
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@db_handle,(FTPB as TTPB).getDataLength,(FTPB as TTPB).getBuffer));
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except
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FHandle := nil;
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raise;
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end
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end;
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procedure TFB25Transaction.InternalStartMultiple;
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var pteb: PISC_TEB_ARRAY;
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i: integer;
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begin
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pteb := nil;
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with FFirebird25ClientAPI do
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begin
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IBAlloc(pteb, 0, Length(FAttachments) * SizeOf(TISC_TEB));
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try
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for i := 0 to Length(FAttachments) - 1 do
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if (FAttachments[i] <> nil) then
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begin
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pteb^[i].db_handle := @((FAttachments[i] as TFB25Attachment).Handle);
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pteb^[i].tpb_length := (FTPB as TTPB).getDataLength;
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pteb^[i].tpb_address := (FTPB as TTPB).getBuffer;
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end;
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try
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Call(isc_start_multiple(StatusVector, @FHandle,
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Length(FAttachments), PISC_TEB(pteb)));
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except
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FHandle := nil;
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raise;
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end;
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finally
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FreeMem(pteb);
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end;
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end;
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end;
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procedure TFB25Transaction.InternalCommit(Force: boolean);
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begin
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with FFirebird25ClientAPI do
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Call(isc_commit_transaction(StatusVector, @FHandle),not Force);
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FHandle := nil;
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end;
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procedure TFB25Transaction.InternalRollback(Force: boolean);
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begin
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with FFirebird25ClientAPI do
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Call(isc_rollback_transaction(StatusVector, @FHandle),not Force);
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FHandle := nil;
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end;
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procedure TFB25Transaction.InternalCommitRetaining;
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begin
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with FFirebird25ClientAPI do
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Call(isc_commit_retaining(StatusVector, @FHandle));
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end;
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procedure TFB25Transaction.InternalRollbackRetaining;
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begin
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with FFirebird25ClientAPI do
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Call(isc_rollback_retaining(StatusVector, @FHandle));
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end;
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function TFB25Transaction.GetInTransaction: boolean;
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begin
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Result := FHandle <> nil;
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end;
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procedure TFB25Transaction.PrepareForCommit;
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begin
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if Length(FAttachments) < 2 then
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IBError(ibxeNotAMultiDatabaseTransaction,[nil]);
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if FHandle = nil then
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Exit;
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with FFirebird25ClientAPI do
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Call(isc_prepare_transaction(StatusVector, @FHandle));
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end;
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end.
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|