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;

{$IFDEF FPC}
{$mode objfpc}{$H+}
{$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;
  protected
    function GetActivityIntf(att: IAttachment): IActivityMonitor; 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.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 Firebird25ClientAPI do
    Call(isc_prepare_transaction(StatusVector, @FHandle));
end;

procedure TFB25Transaction.Commit(Force: boolean);
begin
  if FHandle = nil then
    Exit;
  with Firebird25ClientAPI do
    Call(isc_commit_transaction(StatusVector, @FHandle),not Force);
  FHandle := nil;
end;

procedure TFB25Transaction.CommitRetaining;
begin
  if FHandle = nil then
    Exit;
  with Firebird25ClientAPI 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 Firebird25ClientAPI 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 Firebird25ClientAPI do
    Call(isc_rollback_transaction(StatusVector, @FHandle),not Force);
  FHandle := nil;
end;

procedure TFB25Transaction.RollbackRetaining;
begin
  if FHandle = nil then
    Exit;
  with Firebird25ClientAPI do
    Call(isc_rollback_retaining(StatusVector, @FHandle));
end;

end.

Revision:	45
Committed:	Tue Dec 6 10:33:46 2016 UTC (8 years ago) by tony
Content type:	text/x-pascal
File size:	7141 byte(s)
Log Message:	Committing updates for Release R2-0-0
#	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
64	{$IFDEF FPC}
65	{$mode objfpc}{$H+}
66	{$interfaces COM}
67	{$ENDIF}
68	{$R-}
69
70	interface
71
72	uses
73	Classes, SysUtils, IB, FBClientAPI, FB25ClientAPI, IBHeader,
74	FB25Attachment, FBActivityMonitor, FBTransaction;
75
76	type
77	{ TFB25Transaction }
78
79	TFB25Transaction = class(TFBTransaction,ITransaction, IActivityMonitor)
80	private
81	FHandle: TISC_TR_HANDLE;
82	protected
83	function GetActivityIntf(att: IAttachment): IActivityMonitor; override;
84	public
85	property Handle: TISC_TR_HANDLE read FHandle;
86
87	public
88	{ITransaction}
89	function GetInTransaction: boolean; override;
90	procedure PrepareForCommit; override;
91	procedure Commit(Force: boolean=false); override;
92	procedure CommitRetaining; override;
93	procedure Start(DefaultCompletion: TTransactionCompletion=taCommit); overload; override;
94	procedure Rollback(Force: boolean=false); override;
95	procedure RollbackRetaining; override;
96	end;
97
98	implementation
99
100	uses FBMessages, FBParamBlock;
101
102	{ TFB25Transaction }
103
104	function TFB25Transaction.GetActivityIntf(att: IAttachment): IActivityMonitor;
105	begin
106	Result := (att as TFB25Attachment);
107	end;
108
109	function TFB25Transaction.GetInTransaction: boolean;
110	begin
111	Result := FHandle <> nil;
112	end;
113
114	procedure TFB25Transaction.PrepareForCommit;
115	begin
116	if Length(FAttachments) < 2 then
117	IBError(ibxeNotAMultiDatabaseTransaction,[nil]);
118	if FHandle = nil then
119	Exit;
120	with Firebird25ClientAPI do
121	Call(isc_prepare_transaction(StatusVector, @FHandle));
122	end;
123
124	procedure TFB25Transaction.Commit(Force: boolean);
125	begin
126	if FHandle = nil then
127	Exit;
128	with Firebird25ClientAPI do
129	Call(isc_commit_transaction(StatusVector, @FHandle),not Force);
130	FHandle := nil;
131	end;
132
133	procedure TFB25Transaction.CommitRetaining;
134	begin
135	if FHandle = nil then
136	Exit;
137	with Firebird25ClientAPI do
138	Call(isc_commit_retaining(StatusVector, @FHandle));
139	end;
140
141	procedure TFB25Transaction.Start(DefaultCompletion: TTransactionCompletion);
142	var pteb: PISC_TEB_ARRAY;
143	i: integer;
144	db_handle: TISC_DB_HANDLE;
145	begin
146	if FHandle <> nil then
147	Exit;
148	pteb := nil;
149	FDefaultCompletion := DefaultCompletion;
150	with Firebird25ClientAPI do
151	if (Length(FAttachments) = 1) then
152	try
153	db_handle := (FAttachments[0] as TFB25Attachment).Handle;
154	Call(isc_start_transaction(StatusVector, @FHandle,1,
155	@db_handle,(FTPB as TTPB).getDataLength,(FTPB as TTPB).getBuffer));
156	except
157	FHandle := nil;
158	raise;
159	end
160	else
161	begin
162	IBAlloc(pteb, 0, Length(FAttachments) * SizeOf(TISC_TEB));
163	try
164	for i := 0 to Length(FAttachments) - 1 do
165	if (FAttachments[i] <> nil) then
166	begin
167	pteb^[i].db_handle := @((FAttachments[i] as TFB25Attachment).Handle);
168	pteb^[i].tpb_length := (FTPB as TTPB).getDataLength;
169	pteb^[i].tpb_address := (FTPB as TTPB).getBuffer;
170	end;
171	try
172	Call(isc_start_multiple(StatusVector, @FHandle,
173	Length(FAttachments), PISC_TEB(pteb)));
174	except
175	FHandle := nil;
176	raise;
177	end;
178	finally
179	FreeMem(pteb);
180	end;
181	end;
182	Inc(FSeqNo);
183	end;
184
185	procedure TFB25Transaction.Rollback(Force: boolean);
186	begin
187	if FHandle = nil then
188	Exit;
189	with Firebird25ClientAPI do
190	Call(isc_rollback_transaction(StatusVector, @FHandle),not Force);
191	FHandle := nil;
192	end;
193
194	procedure TFB25Transaction.RollbackRetaining;
195	begin
196	if FHandle = nil then
197	Exit;
198	with Firebird25ClientAPI do
199	Call(isc_rollback_retaining(StatusVector, @FHandle));
200	end;
201
202	end.
203