client/2.5/FB25Transaction.pas

(*
 *  Firebird Interface (fbintf). The fbintf components provide a set of
 *  Pascal language bindings for the Firebird API. Although predominantly
 *  a new development they include source code taken from IBX and may be
 *  considered a derived product. This software thus also includes the copyright
 *  notice and license conditions from IBX.
 *
 *  Except for those parts dervied from IBX, contents of this file are subject
 *  to the Initial Developer's Public License Version 1.0 (the "License"); you
 *  may not use this file except in compliance with the License. You may obtain a
 *  copy of the License here:
 *
 *    http://www.firebirdsql.org/index.php?op=doc&id=idpl
 *
 *  Software distributed under the License is distributed on an "AS
 *  IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 *  implied. See the License for the specific language governing rights
 *  and limitations under the License.
 *
 *  The Initial Developer of the Original Code is Tony Whyman.
 *
 *  The Original Code is (C) 2016 Tony Whyman, MWA Software
 *  (http://www.mwasoftware.co.uk).
 *
 *  All Rights Reserved.
 *
 *  Contributor(s): ______________________________________.
 *
*)
{************************************************************************}
{                                                                        }
{       Borland Delphi Visual Component Library                          }
{       InterBase Express core components                                }
{                                                                        }
{       Copyright (c) 1998-2000 Inprise Corporation                      }
{                                                                        }
{    InterBase Express is based in part on the product                   }
{    Free IB Components, written by Gregory H. Deatz for                 }
{    Hoagland, Longo, Moran, Dunst & Doukas Company.                     }
{    Free IB Components is used under license.                           }
{                                                                        }
{    The contents of this file are subject to the InterBase              }
{    Public License Version 1.0 (the "License"); you may not             }
{    use this file except in compliance with the License. You            }
{    may obtain a copy of the License at http://www.Inprise.com/IPL.html }
{    Software distributed under the License is distributed on            }
{    an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either              }
{    express or implied. See the License for the specific language       }
{    governing rights and limitations under the License.                 }
{    The Original Code was created by InterBase Software Corporation     }
{       and its successors.                                              }
{    Portions created by Inprise Corporation are Copyright (C) Inprise   }
{       Corporation. All Rights Reserved.                                }
{    Contributor(s): Jeff Overcash                                       }
{                                                                        }
{    IBX For Lazarus (Firebird Express)                                  }
{    Contributor: Tony Whyman, MWA Software http://www.mwasoftware.co.uk }
{    Portions created by MWA Software are copyright McCallum Whyman      }
{    Associates Ltd 2011 - 2015                                                }
{                                                                        }
{************************************************************************}
unit FB25Transaction;
{$IFDEF MSWINDOWS} 
{$DEFINE WINDOWS} 
{$ENDIF}

{$IFDEF FPC}
{$mode delphi}
{$interfaces COM}
{$ENDIF}
{$R-}

interface

uses
  Classes, SysUtils, IB, FBClientAPI, FB25ClientAPI, IBHeader,
  FB25Attachment, FBActivityMonitor, FBTransaction;

type
  { TFB25Transaction }

  TFB25Transaction = class(TFBTransaction,ITransaction, IActivityMonitor)
  private
    FHandle: TISC_TR_HANDLE;
    FFirebird25ClientAPI: TFB25ClientAPI;
  protected
    function GetActivityIntf(att: IAttachment): IActivityMonitor; override;
    function GetTrInfo(ReqBuffer: PByte; ReqBufLen: integer): ITrInformation; override;
    procedure SetInterface(api: TFBClientAPI); override;
  public
    property Handle: TISC_TR_HANDLE read FHandle;

  public
    {ITransaction}
    function GetInTransaction: boolean; override;
    procedure PrepareForCommit; override;
    procedure Commit(Force: boolean=false); override;
    procedure CommitRetaining; override;
    procedure Start(DefaultCompletion: TTransactionCompletion=taCommit); overload; override;
    procedure Rollback(Force: boolean=false); override;
    procedure RollbackRetaining; override;
 end;

implementation

uses FBMessages, FBParamBlock;

{ TFB25Transaction }

function TFB25Transaction.GetActivityIntf(att: IAttachment): IActivityMonitor;
begin
  Result := (att as TFB25Attachment);
end;

function TFB25Transaction.GetTrInfo(ReqBuffer: PByte; ReqBufLen: integer
  ): ITrInformation;
begin
  Result := TTrInformation.Create(FFirebird25ClientAPI);
  with FFirebird25ClientAPI, Result as TTrInformation do
     if isc_transaction_info(StatusVector, @(FHandle), ReqBufLen, ReqBuffer,
                               getBufSize, Buffer) > 0 then
          IBDataBaseError;
end;

procedure TFB25Transaction.SetInterface(api: TFBClientAPI);
begin
  inherited SetInterface(api);
  FFirebird25ClientAPI := api as TFB25ClientAPI;
  OnDatabaseError := FFirebird25ClientAPI.IBDataBaseError;
end;

function TFB25Transaction.GetInTransaction: boolean;
begin
  Result := FHandle <> nil;
end;

procedure TFB25Transaction.PrepareForCommit;
begin
  if Length(FAttachments) < 2 then
    IBError(ibxeNotAMultiDatabaseTransaction,[nil]);
  if FHandle = nil then
    Exit;
  with FFirebird25ClientAPI do
    Call(isc_prepare_transaction(StatusVector, @FHandle));
end;

procedure TFB25Transaction.Commit(Force: boolean);
begin
  if FHandle = nil then
    Exit;
  with FFirebird25ClientAPI do
    Call(isc_commit_transaction(StatusVector, @FHandle),not Force);
  FHandle := nil;
end;

procedure TFB25Transaction.CommitRetaining;
begin
  if FHandle = nil then
    Exit;
  with FFirebird25ClientAPI do
    Call(isc_commit_retaining(StatusVector, @FHandle));
end;

procedure TFB25Transaction.Start(DefaultCompletion: TTransactionCompletion);
var pteb: PISC_TEB_ARRAY;
    i: integer;
    db_handle: TISC_DB_HANDLE;
begin
  if FHandle <> nil then
    Exit;
  pteb := nil;
  FDefaultCompletion := DefaultCompletion;
  with FFirebird25ClientAPI do
  if (Length(FAttachments) = 1)  then
  try
    db_handle := (FAttachments[0] as TFB25Attachment).Handle;
    Call(isc_start_transaction(StatusVector, @FHandle,1,
              @db_handle,(FTPB as TTPB).getDataLength,(FTPB as TTPB).getBuffer));
  except
    FHandle := nil;
    raise;
  end
  else
  begin
    IBAlloc(pteb, 0, Length(FAttachments) * SizeOf(TISC_TEB));
     try
        for i := 0 to Length(FAttachments) - 1 do
        if (FAttachments[i] <> nil)  then
        begin
          pteb^[i].db_handle := @((FAttachments[i] as TFB25Attachment).Handle);
          pteb^[i].tpb_length := (FTPB as TTPB).getDataLength;
          pteb^[i].tpb_address := (FTPB as TTPB).getBuffer;
        end;
        try
          Call(isc_start_multiple(StatusVector, @FHandle,
                                   Length(FAttachments), PISC_TEB(pteb)));
        except
          FHandle := nil;
          raise;
        end;
     finally
        FreeMem(pteb);
     end;
  end;
  Inc(FSeqNo);
end;

procedure TFB25Transaction.Rollback(Force: boolean);
begin
  if FHandle = nil then
    Exit;
  with FFirebird25ClientAPI do
    Call(isc_rollback_transaction(StatusVector, @FHandle),not Force);
  FHandle := nil;
end;

procedure TFB25Transaction.RollbackRetaining;
begin
  if FHandle = nil then
    Exit;
  with FFirebird25ClientAPI do
    Call(isc_rollback_retaining(StatusVector, @FHandle));
end;

end.

Revision:	362
Committed:	Tue Dec 7 13:27:39 2021 UTC (2 years, 11 months ago) by tony
Content type:	text/x-pascal
Original Path:	*ibx/branches/journaling/fbintf/client/2.5/FB25Transaction.pas*
File size:	7972 byte(s)
Log Message:	initiate test release
#	Content
1	(*
2	* Firebird Interface (fbintf). The fbintf components provide a set of
3	* Pascal language bindings for the Firebird API. Although predominantly
4	* a new development they include source code taken from IBX and may be
5	* considered a derived product. This software thus also includes the copyright
6	* notice and license conditions from IBX.
7	*
8	* Except for those parts dervied from IBX, contents of this file are subject
9	* to the Initial Developer's Public License Version 1.0 (the "License"); you
10	* may not use this file except in compliance with the License. You may obtain a
11	* copy of the License here:
12	*
13	* http://www.firebirdsql.org/index.php?op=doc&id=idpl
14	*
15	* Software distributed under the License is distributed on an "AS
16	* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
17	* implied. See the License for the specific language governing rights
18	* and limitations under the License.
19	*
20	* The Initial Developer of the Original Code is Tony Whyman.
21	*
22	* The Original Code is (C) 2016 Tony Whyman, MWA Software
23	* (http://www.mwasoftware.co.uk).
24	*
25	* All Rights Reserved.
26	*
27	* Contributor(s): ______________________________________.
28	*
29	*)
30	{************************************************************************}
31	{ }
32	{ Borland Delphi Visual Component Library }
33	{ InterBase Express core components }
34	{ }
35	{ Copyright (c) 1998-2000 Inprise Corporation }
36	{ }
37	{ InterBase Express is based in part on the product }
38	{ Free IB Components, written by Gregory H. Deatz for }
39	{ Hoagland, Longo, Moran, Dunst & Doukas Company. }
40	{ Free IB Components is used under license. }
41	{ }
42	{ The contents of this file are subject to the InterBase }
43	{ Public License Version 1.0 (the "License"); you may not }
44	{ use this file except in compliance with the License. You }
45	{ may obtain a copy of the License at http://www.Inprise.com/IPL.html }
46	{ Software distributed under the License is distributed on }
47	{ an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either }
48	{ express or implied. See the License for the specific language }
49	{ governing rights and limitations under the License. }
50	{ The Original Code was created by InterBase Software Corporation }
51	{ and its successors. }
52	{ Portions created by Inprise Corporation are Copyright (C) Inprise }
53	{ Corporation. All Rights Reserved. }
54	{ Contributor(s): Jeff Overcash }
55	{ }
56	{ IBX For Lazarus (Firebird Express) }
57	{ Contributor: Tony Whyman, MWA Software http://www.mwasoftware.co.uk }
58	{ Portions created by MWA Software are copyright McCallum Whyman }
59	{ Associates Ltd 2011 - 2015 }
60	{ }
61	{************************************************************************}
62	unit FB25Transaction;
63	{$IFDEF MSWINDOWS}
64	{$DEFINE WINDOWS}
65	{$ENDIF}
66
67	{$IFDEF FPC}
68	{$mode delphi}
69	{$interfaces COM}
70	{$ENDIF}
71	{$R-}
72
73	interface
74
75	uses
76	Classes, SysUtils, IB, FBClientAPI, FB25ClientAPI, IBHeader,
77	FB25Attachment, FBActivityMonitor, FBTransaction;
78
79	type
80	{ TFB25Transaction }
81
82	TFB25Transaction = class(TFBTransaction,ITransaction, IActivityMonitor)
83	private
84	FHandle: TISC_TR_HANDLE;
85	FFirebird25ClientAPI: TFB25ClientAPI;
86	protected
87	function GetActivityIntf(att: IAttachment): IActivityMonitor; override;
88	function GetTrInfo(ReqBuffer: PByte; ReqBufLen: integer): ITrInformation; override;
89	procedure SetInterface(api: TFBClientAPI); override;
90	public
91	property Handle: TISC_TR_HANDLE read FHandle;
92
93	public
94	{ITransaction}
95	function GetInTransaction: boolean; override;
96	procedure PrepareForCommit; override;
97	procedure Commit(Force: boolean=false); override;
98	procedure CommitRetaining; override;
99	procedure Start(DefaultCompletion: TTransactionCompletion=taCommit); overload; override;
100	procedure Rollback(Force: boolean=false); override;
101	procedure RollbackRetaining; override;
102	end;
103
104	implementation
105
106	uses FBMessages, FBParamBlock;
107
108	{ TFB25Transaction }
109
110	function TFB25Transaction.GetActivityIntf(att: IAttachment): IActivityMonitor;
111	begin
112	Result := (att as TFB25Attachment);
113	end;
114
115	function TFB25Transaction.GetTrInfo(ReqBuffer: PByte; ReqBufLen: integer
116	): ITrInformation;
117	begin
118	Result := TTrInformation.Create(FFirebird25ClientAPI);
119	with FFirebird25ClientAPI, Result as TTrInformation do
120	if isc_transaction_info(StatusVector, @(FHandle), ReqBufLen, ReqBuffer,
121	getBufSize, Buffer) > 0 then
122	IBDataBaseError;
123	end;
124
125	procedure TFB25Transaction.SetInterface(api: TFBClientAPI);
126	begin
127	inherited SetInterface(api);
128	FFirebird25ClientAPI := api as TFB25ClientAPI;
129	OnDatabaseError := FFirebird25ClientAPI.IBDataBaseError;
130	end;
131
132	function TFB25Transaction.GetInTransaction: boolean;
133	begin
134	Result := FHandle <> nil;
135	end;
136
137	procedure TFB25Transaction.PrepareForCommit;
138	begin
139	if Length(FAttachments) < 2 then
140	IBError(ibxeNotAMultiDatabaseTransaction,[nil]);
141	if FHandle = nil then
142	Exit;
143	with FFirebird25ClientAPI do
144	Call(isc_prepare_transaction(StatusVector, @FHandle));
145	end;
146
147	procedure TFB25Transaction.Commit(Force: boolean);
148	begin
149	if FHandle = nil then
150	Exit;
151	with FFirebird25ClientAPI do
152	Call(isc_commit_transaction(StatusVector, @FHandle),not Force);
153	FHandle := nil;
154	end;
155
156	procedure TFB25Transaction.CommitRetaining;
157	begin
158	if FHandle = nil then
159	Exit;
160	with FFirebird25ClientAPI do
161	Call(isc_commit_retaining(StatusVector, @FHandle));
162	end;
163
164	procedure TFB25Transaction.Start(DefaultCompletion: TTransactionCompletion);
165	var pteb: PISC_TEB_ARRAY;
166	i: integer;
167	db_handle: TISC_DB_HANDLE;
168	begin
169	if FHandle <> nil then
170	Exit;
171	pteb := nil;
172	FDefaultCompletion := DefaultCompletion;
173	with FFirebird25ClientAPI do
174	if (Length(FAttachments) = 1) then
175	try
176	db_handle := (FAttachments[0] as TFB25Attachment).Handle;
177	Call(isc_start_transaction(StatusVector, @FHandle,1,
178	@db_handle,(FTPB as TTPB).getDataLength,(FTPB as TTPB).getBuffer));
179	except
180	FHandle := nil;
181	raise;
182	end
183	else
184	begin
185	IBAlloc(pteb, 0, Length(FAttachments) * SizeOf(TISC_TEB));
186	try
187	for i := 0 to Length(FAttachments) - 1 do
188	if (FAttachments[i] <> nil) then
189	begin
190	pteb^[i].db_handle := @((FAttachments[i] as TFB25Attachment).Handle);
191	pteb^[i].tpb_length := (FTPB as TTPB).getDataLength;
192	pteb^[i].tpb_address := (FTPB as TTPB).getBuffer;
193	end;
194	try
195	Call(isc_start_multiple(StatusVector, @FHandle,
196	Length(FAttachments), PISC_TEB(pteb)));
197	except
198	FHandle := nil;
199	raise;
200	end;
201	finally
202	FreeMem(pteb);
203	end;
204	end;
205	Inc(FSeqNo);
206	end;
207
208	procedure TFB25Transaction.Rollback(Force: boolean);
209	begin
210	if FHandle = nil then
211	Exit;
212	with FFirebird25ClientAPI do
213	Call(isc_rollback_transaction(StatusVector, @FHandle),not Force);
214	FHandle := nil;
215	end;
216
217	procedure TFB25Transaction.RollbackRetaining;
218	begin
219	if FHandle = nil then
220	Exit;
221	with FFirebird25ClientAPI do
222	Call(isc_rollback_retaining(StatusVector, @FHandle));
223	end;
224
225	end.
226