client/3.0/FB30Transaction.pas

(*
 *  Firebird Interface (fbintf). The fbintf components provide a set of
 *  Pascal language bindings for the Firebird API.
 *
 *  The 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): ______________________________________.
 *
*)
unit FB30Transaction;
{$IFDEF MSWINDOWS} 
{$DEFINE WINDOWS} 
{$ENDIF}

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

interface

uses
  Classes, SysUtils, Firebird, IB, FBClientAPI, FB30ClientAPI,
  FB30Attachment, FBParamBlock, FBActivityMonitor, FBTransaction;

type

  { TFB30Transaction }

  TFB30Transaction = class(TFBTransaction,ITransaction, IActivityMonitor)
  private
    FTransactionIntf: Firebird.ITransaction;
    FFirebird30ClientAPI: TFB30ClientAPI;
    procedure FreeHandle(Force: boolean);
  protected
    function GetActivityIntf(att: IAttachment): IActivityMonitor; override;
    procedure SetInterface(api: TFBClientAPI); override;
    function GetTrInfo(ReqBuffer: PByte; ReqBufLen: integer): ITrInformation; override;
    procedure InternalStartSingle(attachment: IAttachment); override;
    procedure InternalStartMultiple; override;
    function InternalCommit(Force: boolean): TTrCompletionState; override;
    procedure InternalCommitRetaining; override;
    function InternalRollback(Force: boolean): TTrCompletionState; override;
    procedure InternalRollbackRetaining; override;
  public
    constructor Create(api: TFBClientAPI; Attachment: IAttachment; aTransactionIntf: Firebird.ITransaction); overload;
    destructor Destroy; override;
    property TransactionIntf: Firebird.ITransaction read FTransactionIntf;
    {ITransaction}
    function GetInTransaction: boolean; override;
    procedure PrepareForCommit; override;
  end;


implementation

uses FBMessages;

{ TFB30Transaction }

procedure TFB30Transaction.FreeHandle(Force: boolean);
begin
  if assigned(FTransactionIntf) then
  try
    FTransactionIntf.release;
  except
    if not Force then raise;
    {else ignore if Force = true}
  end;
  FTransactionIntf := nil;
end;

function TFB30Transaction.GetActivityIntf(att: IAttachment): IActivityMonitor;
begin
  att.QueryInterface(IActivityMonitor,Result);
end;

procedure TFB30Transaction.SetInterface(api: TFBClientAPI);
begin
  inherited SetInterface(api);
  FFirebird30ClientAPI := api as TFB30ClientAPI;
end;

function TFB30Transaction.GetTrInfo(ReqBuffer: PByte; ReqBufLen: integer
  ): ITrInformation;
begin
  Result := TTrInformation.Create(FFirebird30ClientAPI);
  with FFirebird30ClientAPI, Result as TTrInformation do
  begin
    FTransactionIntf.getInfo(StatusIntf, ReqBufLen, BytePtr(ReqBuffer),
                               getBufSize, BytePtr(Buffer));
    Check4DataBaseError;
  end
end;

procedure TFB30Transaction.InternalStartSingle(attachment: IAttachment);
begin
  if FTransactionIntf = nil then
  with FFirebird30ClientAPI do
  begin
    FTransactionIntf  := (attachment as TFB30Attachment).AttachmentIntf.startTransaction(StatusIntf,
             (FTPB as TTPB).getDataLength,BytePtr((FTPB as TTPB).getBuffer));
    Check4DataBaseError;
    FTransactionIntf.addRef();
  end;
  SignalActivity;
end;

procedure TFB30Transaction.InternalStartMultiple;
var Dtc: IDtc;
    DtcStart: IDtcStart;
    i: integer;
begin
  if FTransactionIntf = nil then
  with FFirebird30ClientAPI do
  begin
    Dtc := MasterIntf.getDtc;
    DtcStart := Dtc.startBuilder(StatusIntf);
    Check4DataBaseError;

    for i := 0 to Length(FAttachments) - 1 do
    if (FAttachments[i] <> nil)  then
    begin
      DTCStart.addWithTpb(StatusIntf,
                          (FAttachments[i] as TFB30Attachment).AttachmentIntf,
                          (FTPB as TTPB).getDataLength,
                          BytePtr((FTPB as TTPB).getBuffer));
      Check4DataBaseError;
    end;

    FTransactionIntf := DtcStart.start(StatusIntf);
    Check4DataBaseError;
    FTransactionIntf.addRef();
    SignalActivity;
  end;
end;

function TFB30Transaction.InternalCommit(Force: boolean): TTrCompletionState;
begin
  with FFirebird30ClientAPI do
  begin
    Result := trCommitted;
    FTransactionIntf.commit(StatusIntf);
    if InErrorState then
    begin
      if Force then
        Result := trCommitFailed
      else
       IBDataBaseError;
    end;
  end;
  SignalActivity;
  FreeHandle(Force);
end;

procedure TFB30Transaction.InternalCommitRetaining;
begin
  with FFirebird30ClientAPI do
  begin
    FTransactionIntf.commitRetaining(StatusIntf);
    Check4DataBaseError;
  end;
  SignalActivity;
end;

function TFB30Transaction.InternalRollback(Force: boolean): TTrCompletionState;
begin
  with FFirebird30ClientAPI do
  begin
    FTransactionIntf.rollback(StatusIntf);
    Result := trRolledback;
    if InErrorState then
    begin
      if Force then
        Result := trRollbackFailed
      else
       IBDataBaseError;
    end;
  end;
  SignalActivity;
  FreeHandle(Force);
end;

procedure TFB30Transaction.InternalRollbackRetaining;
begin
  with FFirebird30ClientAPI do
  begin
    FTransactionIntf.rollbackRetaining(StatusIntf);
    Check4DataBaseError;
  end;
  SignalActivity;
end;

constructor TFB30Transaction.Create(api: TFBClientAPI; Attachment: IAttachment;
  aTransactionIntf: Firebird.ITransaction);
begin
  FTransactionIntf := aTransactionIntf;
  FTransactionIntf.addRef();
  FForeignHandle := true;
  inherited Create(api,Attachment,nil,taCommit,'');
end;

destructor TFB30Transaction.Destroy;
begin
  inherited Destroy;
  FreeHandle(true);
end;

function TFB30Transaction.GetInTransaction: boolean;
begin
  Result := FTransactionIntf <> nil;
end;

procedure TFB30Transaction.PrepareForCommit;
begin
  if Length(FAttachments) < 2 then
    IBError(ibxeNotAMultiDatabaseTransaction,[nil]);
  if FTransactionIntf = nil then
    Exit;
  with FFirebird30ClientAPI do
  begin
    FTransactionIntf.prepare(StatusIntf,0,nil);
    Check4DataBaseError;
  end;
  SignalActivity;
end;


end.

Revision:	387
Committed:	Wed Jan 19 13:34:42 2022 UTC (2 years, 10 months ago) by tony
Content type:	text/x-pascal
File size:	6573 byte(s)
Log Message:	Transactions started within a UDR are not forcibly closed if still active immediately prior to UDR exit
#	Content
1	(*
2	* Firebird Interface (fbintf). The fbintf components provide a set of
3	* Pascal language bindings for the Firebird API.
4	*
5	* The contents of this file are subject to the Initial Developer's
6	* Public License Version 1.0 (the "License"); you may not use this
7	* file except in compliance with the License. You may obtain a copy
8	* of the License here:
9	*
10	* http://www.firebirdsql.org/index.php?op=doc&id=idpl
11	*
12	* Software distributed under the License is distributed on an "AS
13	* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
14	* implied. See the License for the specific language governing rights
15	* and limitations under the License.
16	*
17	* The Initial Developer of the Original Code is Tony Whyman.
18	*
19	* The Original Code is (C) 2016 Tony Whyman, MWA Software
20	* (http://www.mwasoftware.co.uk).
21	*
22	* All Rights Reserved.
23	*
24	* Contributor(s): ______________________________________.
25	*
26	*)
27	unit FB30Transaction;
28	{$IFDEF MSWINDOWS}
29	{$DEFINE WINDOWS}
30	{$ENDIF}
31
32	{$IFDEF FPC}
33	{$mode delphi}
34	{$interfaces COM}
35	{$ENDIF}
36
37	interface
38
39	uses
40	Classes, SysUtils, Firebird, IB, FBClientAPI, FB30ClientAPI,
41	FB30Attachment, FBParamBlock, FBActivityMonitor, FBTransaction;
42
43	type
44
45	{ TFB30Transaction }
46
47	TFB30Transaction = class(TFBTransaction,ITransaction, IActivityMonitor)
48	private
49	FTransactionIntf: Firebird.ITransaction;
50	FFirebird30ClientAPI: TFB30ClientAPI;
51	procedure FreeHandle(Force: boolean);
52	protected
53	function GetActivityIntf(att: IAttachment): IActivityMonitor; override;
54	procedure SetInterface(api: TFBClientAPI); override;
55	function GetTrInfo(ReqBuffer: PByte; ReqBufLen: integer): ITrInformation; override;
56	procedure InternalStartSingle(attachment: IAttachment); override;
57	procedure InternalStartMultiple; override;
58	function InternalCommit(Force: boolean): TTrCompletionState; override;
59	procedure InternalCommitRetaining; override;
60	function InternalRollback(Force: boolean): TTrCompletionState; override;
61	procedure InternalRollbackRetaining; override;
62	public
63	constructor Create(api: TFBClientAPI; Attachment: IAttachment; aTransactionIntf: Firebird.ITransaction); overload;
64	destructor Destroy; override;
65	property TransactionIntf: Firebird.ITransaction read FTransactionIntf;
66	{ITransaction}
67	function GetInTransaction: boolean; override;
68	procedure PrepareForCommit; override;
69	end;
70
71
72	implementation
73
74	uses FBMessages;
75
76	{ TFB30Transaction }
77
78	procedure TFB30Transaction.FreeHandle(Force: boolean);
79	begin
80	if assigned(FTransactionIntf) then
81	try
82	FTransactionIntf.release;
83	except
84	if not Force then raise;
85	{else ignore if Force = true}
86	end;
87	FTransactionIntf := nil;
88	end;
89
90	function TFB30Transaction.GetActivityIntf(att: IAttachment): IActivityMonitor;
91	begin
92	att.QueryInterface(IActivityMonitor,Result);
93	end;
94
95	procedure TFB30Transaction.SetInterface(api: TFBClientAPI);
96	begin
97	inherited SetInterface(api);
98	FFirebird30ClientAPI := api as TFB30ClientAPI;
99	end;
100
101	function TFB30Transaction.GetTrInfo(ReqBuffer: PByte; ReqBufLen: integer
102	): ITrInformation;
103	begin
104	Result := TTrInformation.Create(FFirebird30ClientAPI);
105	with FFirebird30ClientAPI, Result as TTrInformation do
106	begin
107	FTransactionIntf.getInfo(StatusIntf, ReqBufLen, BytePtr(ReqBuffer),
108	getBufSize, BytePtr(Buffer));
109	Check4DataBaseError;
110	end
111	end;
112
113	procedure TFB30Transaction.InternalStartSingle(attachment: IAttachment);
114	begin
115	if FTransactionIntf = nil then
116	with FFirebird30ClientAPI do
117	begin
118	FTransactionIntf := (attachment as TFB30Attachment).AttachmentIntf.startTransaction(StatusIntf,
119	(FTPB as TTPB).getDataLength,BytePtr((FTPB as TTPB).getBuffer));
120	Check4DataBaseError;
121	FTransactionIntf.addRef();
122	end;
123	SignalActivity;
124	end;
125
126	procedure TFB30Transaction.InternalStartMultiple;
127	var Dtc: IDtc;
128	DtcStart: IDtcStart;
129	i: integer;
130	begin
131	if FTransactionIntf = nil then
132	with FFirebird30ClientAPI do
133	begin
134	Dtc := MasterIntf.getDtc;
135	DtcStart := Dtc.startBuilder(StatusIntf);
136	Check4DataBaseError;
137
138	for i := 0 to Length(FAttachments) - 1 do
139	if (FAttachments[i] <> nil) then
140	begin
141	DTCStart.addWithTpb(StatusIntf,
142	(FAttachments[i] as TFB30Attachment).AttachmentIntf,
143	(FTPB as TTPB).getDataLength,
144	BytePtr((FTPB as TTPB).getBuffer));
145	Check4DataBaseError;
146	end;
147
148	FTransactionIntf := DtcStart.start(StatusIntf);
149	Check4DataBaseError;
150	FTransactionIntf.addRef();
151	SignalActivity;
152	end;
153	end;
154
155	function TFB30Transaction.InternalCommit(Force: boolean): TTrCompletionState;
156	begin
157	with FFirebird30ClientAPI do
158	begin
159	Result := trCommitted;
160	FTransactionIntf.commit(StatusIntf);
161	if InErrorState then
162	begin
163	if Force then
164	Result := trCommitFailed
165	else
166	IBDataBaseError;
167	end;
168	end;
169	SignalActivity;
170	FreeHandle(Force);
171	end;
172
173	procedure TFB30Transaction.InternalCommitRetaining;
174	begin
175	with FFirebird30ClientAPI do
176	begin
177	FTransactionIntf.commitRetaining(StatusIntf);
178	Check4DataBaseError;
179	end;
180	SignalActivity;
181	end;
182
183	function TFB30Transaction.InternalRollback(Force: boolean): TTrCompletionState;
184	begin
185	with FFirebird30ClientAPI do
186	begin
187	FTransactionIntf.rollback(StatusIntf);
188	Result := trRolledback;
189	if InErrorState then
190	begin
191	if Force then
192	Result := trRollbackFailed
193	else
194	IBDataBaseError;
195	end;
196	end;
197	SignalActivity;
198	FreeHandle(Force);
199	end;
200
201	procedure TFB30Transaction.InternalRollbackRetaining;
202	begin
203	with FFirebird30ClientAPI do
204	begin
205	FTransactionIntf.rollbackRetaining(StatusIntf);
206	Check4DataBaseError;
207	end;
208	SignalActivity;
209	end;
210
211	constructor TFB30Transaction.Create(api: TFBClientAPI; Attachment: IAttachment;
212	aTransactionIntf: Firebird.ITransaction);
213	begin
214	FTransactionIntf := aTransactionIntf;
215	FTransactionIntf.addRef();
216	FForeignHandle := true;
217	inherited Create(api,Attachment,nil,taCommit,'');
218	end;
219
220	destructor TFB30Transaction.Destroy;
221	begin
222	inherited Destroy;
223	FreeHandle(true);
224	end;
225
226	function TFB30Transaction.GetInTransaction: boolean;
227	begin
228	Result := FTransactionIntf <> nil;
229	end;
230
231	procedure TFB30Transaction.PrepareForCommit;
232	begin
233	if Length(FAttachments) < 2 then
234	IBError(ibxeNotAMultiDatabaseTransaction,[nil]);
235	if FTransactionIntf = nil then
236	Exit;
237	with FFirebird30ClientAPI do
238	begin
239	FTransactionIntf.prepare(StatusIntf,0,nil);
240	Check4DataBaseError;
241	end;
242	SignalActivity;
243	end;
244
245
246	end.
247