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;

{$IFDEF FPC}
{$mode objfpc}{$H+}
{$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;
    procedure StartMultiple;
    procedure FreeHandle;
  protected
    function GetActivityIntf(att: IAttachment): IActivityMonitor; 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 Firebird30ClientAPI 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
  Result := att as TFB30Attachment;
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 Firebird30ClientAPI do
  begin
    FTransactionIntf.prepare(StatusIntf,0,nil);
    Check4DataBaseError;
  end;
  SignalActivity;
end;

procedure TFB30Transaction.Commit(Force: boolean);
begin
  if FTransactionIntf = nil then
    Exit;
  with Firebird30ClientAPI 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 Firebird30ClientAPI 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) > 0 then
    StartMultiple
  else
    with Firebird30ClientAPI do
    begin
      FTransactionIntf  := (FAttachments[0] as TFB30Attachment).AttachmentIntf.startTransaction(StatusIntf,
               (FTPB as TTPB).getDataLength,BytePtr((FTPB as TTPB).getBuffer));
      Check4DataBaseError;
    end;
  SignalActivity;
  Inc(FSeqNo);
end;

procedure TFB30Transaction.Rollback(Force: boolean);
begin
  if FTransactionIntf = nil then
    Exit;
  with Firebird30ClientAPI 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 Firebird30ClientAPI do
  begin
    FTransactionIntf.rollbackRetaining(StatusIntf);
    Check4DataBaseError;
  end;
  SignalActivity;
end;


end.

Revision:	45
Committed:	Tue Dec 6 10:33:46 2016 UTC (7 years, 4 months ago) by tony
Content type:	text/x-pascal
File size:	5124 byte(s)
Log Message:	Committing updates for Release R2-0-0
#	User	Rev	Content
1	tony	45	(*
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
29			{$IFDEF FPC}
30			{$mode objfpc}{$H+}
31			{$interfaces COM}
32			{$ENDIF}
33
34			interface
35
36			uses
37			Classes, SysUtils, Firebird, IB, FBClientAPI, FB30ClientAPI,
38			FB30Attachment, FBParamBlock, FBActivityMonitor, FBTransaction;
39
40			type
41
42			{ TFB30Transaction }
43
44			TFB30Transaction = class(TFBTransaction,ITransaction, IActivityMonitor)
45			private
46			FTransactionIntf: Firebird.ITransaction;
47			procedure StartMultiple;
48			procedure FreeHandle;
49			protected
50			function GetActivityIntf(att: IAttachment): IActivityMonitor; override;
51			public
52			destructor Destroy; override;
53			property TransactionIntf: Firebird.ITransaction read FTransactionIntf;
54			{ITransaction}
55			function GetInTransaction: boolean; override;
56			procedure PrepareForCommit; override;
57			procedure Commit(Force: boolean=false); override;
58			procedure CommitRetaining; override;
59			procedure Start(DefaultCompletion: TTransactionCompletion=taCommit); overload; override;
60			procedure Rollback(Force: boolean=false); override;
61			procedure RollbackRetaining; override;
62			end;
63
64
65			implementation
66
67			uses FBMessages;
68
69			{ TFB30Transaction }
70
71			procedure TFB30Transaction.StartMultiple;
72			var Dtc: IDtc;
73			DtcStart: IDtcStart;
74			i: integer;
75			begin
76			with Firebird30ClientAPI do
77			begin
78			Dtc := MasterIntf.getDtc;
79			DtcStart := Dtc.startBuilder(StatusIntf);
80			Check4DataBaseError;
81
82			for i := 0 to Length(FAttachments) - 1 do
83			if (FAttachments[i] <> nil) then
84			begin
85			DTCStart.addWithTpb(StatusIntf,
86			(FAttachments[i] as TFB30Attachment).AttachmentIntf,
87			(FTPB as TTPB).getDataLength,
88			BytePtr((FTPB as TTPB).getBuffer));
89			Check4DataBaseError;
90			end;
91			FTransactionIntf := DtcStart.start(StatusIntf);
92			Check4DataBaseError;
93			end;
94			end;
95
96			procedure TFB30Transaction.FreeHandle;
97			begin
98			if assigned(FTransactionIntf) then
99			FTransactionIntf.release;
100			FTransactionIntf := nil;
101			end;
102
103			function TFB30Transaction.GetActivityIntf(att: IAttachment): IActivityMonitor;
104			begin
105			Result := att as TFB30Attachment;
106			end;
107
108			destructor TFB30Transaction.Destroy;
109			begin
110			inherited Destroy;
111			FreeHandle;
112			end;
113
114			function TFB30Transaction.GetInTransaction: boolean;
115			begin
116			Result := FTransactionIntf <> nil;
117			end;
118
119			procedure TFB30Transaction.PrepareForCommit;
120			begin
121			if Length(FAttachments) < 2 then
122			IBError(ibxeNotAMultiDatabaseTransaction,[nil]);
123			if FTransactionIntf = nil then
124			Exit;
125			with Firebird30ClientAPI do
126			begin
127			FTransactionIntf.prepare(StatusIntf,0,nil);
128			Check4DataBaseError;
129			end;
130			SignalActivity;
131			end;
132
133			procedure TFB30Transaction.Commit(Force: boolean);
134			begin
135			if FTransactionIntf = nil then
136			Exit;
137			with Firebird30ClientAPI do
138			begin
139			FTransactionIntf.commit(StatusIntf);
140			if not Force and InErrorState then
141			IBDataBaseError;
142			end;
143			SignalActivity;
144			FreeHandle;
145			end;
146
147			procedure TFB30Transaction.CommitRetaining;
148			begin
149			if FTransactionIntf = nil then
150			Exit;
151			with Firebird30ClientAPI do
152			begin
153			FTransactionIntf.commitRetaining(StatusIntf);
154			Check4DataBaseError;
155			end;
156			SignalActivity;
157			end;
158
159			procedure TFB30Transaction.Start(DefaultCompletion: TTransactionCompletion);
160			begin
161			if FTransactionIntf <> nil then
162			Exit;
163
164			FDefaultCompletion := DefaultCompletion;
165
166			if Length(FAttachments) > 0 then
167			StartMultiple
168			else
169			with Firebird30ClientAPI do
170			begin
171			FTransactionIntf := (FAttachments[0] as TFB30Attachment).AttachmentIntf.startTransaction(StatusIntf,
172			(FTPB as TTPB).getDataLength,BytePtr((FTPB as TTPB).getBuffer));
173			Check4DataBaseError;
174			end;
175			SignalActivity;
176			Inc(FSeqNo);
177			end;
178
179			procedure TFB30Transaction.Rollback(Force: boolean);
180			begin
181			if FTransactionIntf = nil then
182			Exit;
183			with Firebird30ClientAPI do
184			begin
185			FTransactionIntf.rollback(StatusIntf);
186			if not Force and InErrorState then
187			IBDataBaseError;
188			end;
189			SignalActivity;
190			FreeHandle;
191			end;
192
193			procedure TFB30Transaction.RollbackRetaining;
194			begin
195			if FTransactionIntf = nil then
196			Exit;
197			with Firebird30ClientAPI do
198			begin
199			FTransactionIntf.rollbackRetaining(StatusIntf);
200			Check4DataBaseError;
201			end;
202			SignalActivity;
203			end;
204
205
206			end.
207