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;
    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;

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:	263
Committed:	Thu Dec 6 15:55:01 2018 UTC (5 years, 11 months ago) by tony
Content type:	text/x-pascal
File size:	7500 byte(s)
Log Message:	Release 2.3.2 committed
#	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. 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	tony	56	{$IFDEF MSWINDOWS}
64			{$DEFINE WINDOWS}
65			{$ENDIF}
66	tony	45
67			{$IFDEF FPC}
68	tony	56	{$mode delphi}
69	tony	45	{$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	tony	263	FFirebird25ClientAPI: TFB25ClientAPI;
86	tony	45	protected
87			function GetActivityIntf(att: IAttachment): IActivityMonitor; override;
88	tony	263	procedure SetInterface(api: TFBClientAPI); override;
89	tony	45	public
90			property Handle: TISC_TR_HANDLE read FHandle;
91
92			public
93			{ITransaction}
94			function GetInTransaction: boolean; override;
95			procedure PrepareForCommit; override;
96			procedure Commit(Force: boolean=false); override;
97			procedure CommitRetaining; override;
98			procedure Start(DefaultCompletion: TTransactionCompletion=taCommit); overload; override;
99			procedure Rollback(Force: boolean=false); override;
100			procedure RollbackRetaining; override;
101			end;
102
103			implementation
104
105			uses FBMessages, FBParamBlock;
106
107			{ TFB25Transaction }
108
109			function TFB25Transaction.GetActivityIntf(att: IAttachment): IActivityMonitor;
110			begin
111			Result := (att as TFB25Attachment);
112			end;
113
114	tony	263	procedure TFB25Transaction.SetInterface(api: TFBClientAPI);
115			begin
116			inherited SetInterface(api);
117			FFirebird25ClientAPI := api as TFB25ClientAPI;
118			OnDatabaseError := FFirebird25ClientAPI.IBDataBaseError;
119			end;
120
121	tony	45	function TFB25Transaction.GetInTransaction: boolean;
122			begin
123			Result := FHandle <> nil;
124			end;
125
126			procedure TFB25Transaction.PrepareForCommit;
127			begin
128			if Length(FAttachments) < 2 then
129			IBError(ibxeNotAMultiDatabaseTransaction,[nil]);
130			if FHandle = nil then
131			Exit;
132	tony	263	with FFirebird25ClientAPI do
133	tony	45	Call(isc_prepare_transaction(StatusVector, @FHandle));
134			end;
135
136			procedure TFB25Transaction.Commit(Force: boolean);
137			begin
138			if FHandle = nil then
139			Exit;
140	tony	263	with FFirebird25ClientAPI do
141	tony	45	Call(isc_commit_transaction(StatusVector, @FHandle),not Force);
142			FHandle := nil;
143			end;
144
145			procedure TFB25Transaction.CommitRetaining;
146			begin
147			if FHandle = nil then
148			Exit;
149	tony	263	with FFirebird25ClientAPI do
150	tony	45	Call(isc_commit_retaining(StatusVector, @FHandle));
151			end;
152
153			procedure TFB25Transaction.Start(DefaultCompletion: TTransactionCompletion);
154			var pteb: PISC_TEB_ARRAY;
155			i: integer;
156			db_handle: TISC_DB_HANDLE;
157			begin
158			if FHandle <> nil then
159			Exit;
160			pteb := nil;
161			FDefaultCompletion := DefaultCompletion;
162	tony	263	with FFirebird25ClientAPI do
163	tony	45	if (Length(FAttachments) = 1) then
164			try
165			db_handle := (FAttachments[0] as TFB25Attachment).Handle;
166			Call(isc_start_transaction(StatusVector, @FHandle,1,
167			@db_handle,(FTPB as TTPB).getDataLength,(FTPB as TTPB).getBuffer));
168			except
169			FHandle := nil;
170			raise;
171			end
172			else
173			begin
174			IBAlloc(pteb, 0, Length(FAttachments) * SizeOf(TISC_TEB));
175			try
176			for i := 0 to Length(FAttachments) - 1 do
177			if (FAttachments[i] <> nil) then
178			begin
179			pteb^[i].db_handle := @((FAttachments[i] as TFB25Attachment).Handle);
180			pteb^[i].tpb_length := (FTPB as TTPB).getDataLength;
181			pteb^[i].tpb_address := (FTPB as TTPB).getBuffer;
182			end;
183			try
184			Call(isc_start_multiple(StatusVector, @FHandle,
185			Length(FAttachments), PISC_TEB(pteb)));
186			except
187			FHandle := nil;
188			raise;
189			end;
190			finally
191			FreeMem(pteb);
192			end;
193			end;
194			Inc(FSeqNo);
195			end;
196
197			procedure TFB25Transaction.Rollback(Force: boolean);
198			begin
199			if FHandle = nil then
200			Exit;
201	tony	263	with FFirebird25ClientAPI do
202	tony	45	Call(isc_rollback_transaction(StatusVector, @FHandle),not Force);
203			FHandle := nil;
204			end;
205
206			procedure TFB25Transaction.RollbackRetaining;
207			begin
208			if FHandle = nil then
209			Exit;
210	tony	263	with FFirebird25ClientAPI do
211	tony	45	Call(isc_rollback_retaining(StatusVector, @FHandle));
212			end;
213
214			end.
215