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 (7 years, 11 months ago) by tony
Content type:	text/x-pascal
File size:	7141 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. 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