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 StartMultiple;
    procedure FreeHandle;
  protected
    function GetActivityIntf(att: IAttachment): IActivityMonitor; override;
    procedure SetInterface(api: TFBClientAPI); override;
  public
    destructor Destroy; override;
    property TransactionIntf: Firebird.ITransaction read FTransactionIntf;
    {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;

{ TFB30Transaction }

procedure TFB30Transaction.StartMultiple;
var Dtc: IDtc;
    DtcStart: IDtcStart;
    i: integer;
begin
  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;
  end;
end;

procedure TFB30Transaction.FreeHandle;
begin
  if assigned(FTransactionIntf) then
    FTransactionIntf.release;
  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;

destructor TFB30Transaction.Destroy;
begin
  inherited Destroy;
  FreeHandle;
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;

procedure TFB30Transaction.Commit(Force: boolean);
begin
  if FTransactionIntf = nil then
    Exit;
  with FFirebird30ClientAPI do
  begin
    FTransactionIntf.commit(StatusIntf);
    if not Force and InErrorState then
       IBDataBaseError;
  end;
  SignalActivity;
  FreeHandle;
end;

procedure TFB30Transaction.CommitRetaining;
begin
  if FTransactionIntf = nil then
    Exit;
  with FFirebird30ClientAPI do
  begin
    FTransactionIntf.commitRetaining(StatusIntf);
    Check4DataBaseError;
  end;
  SignalActivity;
end;

procedure TFB30Transaction.Start(DefaultCompletion: TTransactionCompletion);
begin
  if FTransactionIntf <> nil then
    Exit;
  FDefaultCompletion := DefaultCompletion;

  if Length(FAttachments) = 1 then
    with FFirebird30ClientAPI do
    begin
      FTransactionIntf  := (FAttachments[0] as TFB30Attachment).AttachmentIntf.startTransaction(StatusIntf,
               (FTPB as TTPB).getDataLength,BytePtr((FTPB as TTPB).getBuffer));
      Check4DataBaseError;
    end
  else
    StartMultiple;
  SignalActivity;
  Inc(FSeqNo);
end;

procedure TFB30Transaction.Rollback(Force: boolean);
begin
  if FTransactionIntf = nil then
    Exit;
  with FFirebird30ClientAPI do
  begin
    FTransactionIntf.rollback(StatusIntf);
    if not Force and InErrorState then
       IBDataBaseError;
  end;
  SignalActivity;
  FreeHandle;
end;

procedure TFB30Transaction.RollbackRetaining;
begin
  if FTransactionIntf = nil then
    Exit;
  with FFirebird30ClientAPI do
  begin
    FTransactionIntf.rollbackRetaining(StatusIntf);
    Check4DataBaseError;
  end;
  SignalActivity;
end;


end.

Revision:	315
Committed:	Thu Feb 25 11:56:36 2021 UTC (3 years, 8 months ago) by tony
Content type:	text/x-pascal
File size:	5435 byte(s)
Log Message:	Updated for IBX 4 release
#	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 StartMultiple;
52	procedure FreeHandle;
53	protected
54	function GetActivityIntf(att: IAttachment): IActivityMonitor; override;
55	procedure SetInterface(api: TFBClientAPI); override;
56	public
57	destructor Destroy; override;
58	property TransactionIntf: Firebird.ITransaction read FTransactionIntf;
59	{ITransaction}
60	function GetInTransaction: boolean; override;
61	procedure PrepareForCommit; override;
62	procedure Commit(Force: boolean=false); override;
63	procedure CommitRetaining; override;
64	procedure Start(DefaultCompletion: TTransactionCompletion=taCommit); overload; override;
65	procedure Rollback(Force: boolean=false); override;
66	procedure RollbackRetaining; override;
67	end;
68
69
70	implementation
71
72	uses FBMessages;
73
74	{ TFB30Transaction }
75
76	procedure TFB30Transaction.StartMultiple;
77	var Dtc: IDtc;
78	DtcStart: IDtcStart;
79	i: integer;
80	begin
81	with FFirebird30ClientAPI do
82	begin
83	Dtc := MasterIntf.getDtc;
84	DtcStart := Dtc.startBuilder(StatusIntf);
85	Check4DataBaseError;
86
87	for i := 0 to Length(FAttachments) - 1 do
88	if (FAttachments[i] <> nil) then
89	begin
90	DTCStart.addWithTpb(StatusIntf,
91	(FAttachments[i] as TFB30Attachment).AttachmentIntf,
92	(FTPB as TTPB).getDataLength,
93	BytePtr((FTPB as TTPB).getBuffer));
94	Check4DataBaseError;
95	end;
96	FTransactionIntf := DtcStart.start(StatusIntf);
97	Check4DataBaseError;
98	end;
99	end;
100
101	procedure TFB30Transaction.FreeHandle;
102	begin
103	if assigned(FTransactionIntf) then
104	FTransactionIntf.release;
105	FTransactionIntf := nil;
106	end;
107
108	function TFB30Transaction.GetActivityIntf(att: IAttachment): IActivityMonitor;
109	begin
110	att.QueryInterface(IActivityMonitor,Result);
111	end;
112
113	procedure TFB30Transaction.SetInterface(api: TFBClientAPI);
114	begin
115	inherited SetInterface(api);
116	FFirebird30ClientAPI := api as TFB30ClientAPI;
117	end;
118
119	destructor TFB30Transaction.Destroy;
120	begin
121	inherited Destroy;
122	FreeHandle;
123	end;
124
125	function TFB30Transaction.GetInTransaction: boolean;
126	begin
127	Result := FTransactionIntf <> nil;
128	end;
129
130	procedure TFB30Transaction.PrepareForCommit;
131	begin
132	if Length(FAttachments) < 2 then
133	IBError(ibxeNotAMultiDatabaseTransaction,[nil]);
134	if FTransactionIntf = nil then
135	Exit;
136	with FFirebird30ClientAPI do
137	begin
138	FTransactionIntf.prepare(StatusIntf,0,nil);
139	Check4DataBaseError;
140	end;
141	SignalActivity;
142	end;
143
144	procedure TFB30Transaction.Commit(Force: boolean);
145	begin
146	if FTransactionIntf = nil then
147	Exit;
148	with FFirebird30ClientAPI do
149	begin
150	FTransactionIntf.commit(StatusIntf);
151	if not Force and InErrorState then
152	IBDataBaseError;
153	end;
154	SignalActivity;
155	FreeHandle;
156	end;
157
158	procedure TFB30Transaction.CommitRetaining;
159	begin
160	if FTransactionIntf = nil then
161	Exit;
162	with FFirebird30ClientAPI do
163	begin
164	FTransactionIntf.commitRetaining(StatusIntf);
165	Check4DataBaseError;
166	end;
167	SignalActivity;
168	end;
169
170	procedure TFB30Transaction.Start(DefaultCompletion: TTransactionCompletion);
171	begin
172	if FTransactionIntf <> nil then
173	Exit;
174	FDefaultCompletion := DefaultCompletion;
175
176	if Length(FAttachments) = 1 then
177	with FFirebird30ClientAPI do
178	begin
179	FTransactionIntf := (FAttachments[0] as TFB30Attachment).AttachmentIntf.startTransaction(StatusIntf,
180	(FTPB as TTPB).getDataLength,BytePtr((FTPB as TTPB).getBuffer));
181	Check4DataBaseError;
182	end
183	else
184	StartMultiple;
185	SignalActivity;
186	Inc(FSeqNo);
187	end;
188
189	procedure TFB30Transaction.Rollback(Force: boolean);
190	begin
191	if FTransactionIntf = nil then
192	Exit;
193	with FFirebird30ClientAPI do
194	begin
195	FTransactionIntf.rollback(StatusIntf);
196	if not Force and InErrorState then
197	IBDataBaseError;
198	end;
199	SignalActivity;
200	FreeHandle;
201	end;
202
203	procedure TFB30Transaction.RollbackRetaining;
204	begin
205	if FTransactionIntf = nil then
206	Exit;
207	with FFirebird30ClientAPI do
208	begin
209	FTransactionIntf.rollbackRetaining(StatusIntf);
210	Check4DataBaseError;
211	end;
212	SignalActivity;
213	end;
214
215
216	end.
217