udr/client/FBTransaction.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 FBTransaction;
{$IFDEF MSWINDOWS} 
{$DEFINE WINDOWS} 
{$ENDIF}

{$IFDEF FPC}
{$mode delphi}
{$interfaces COM}
{$ENDIF}

interface

uses
  Classes, SysUtils, IB, FBParamBlock, FBActivityMonitor, FBClientAPI, FBOutputBlock;

type
  { TFBTransaction }

  TFBTransaction = class(TActivityReporter, IActivityMonitor,ITransaction)
  private
    FFirebirdAPI: TFBClientAPI;
    function GenerateTPB(sl: array of byte): ITPB;
  protected
    FTPB: ITPB;
    FSeqNo: integer;
    FDefaultCompletion: TTransactionAction;
    FAttachments: array of IAttachment; {Keep reference to attachment - ensures
                                          attachment cannot be freed before transaction}
    procedure CheckHandle;
    function GetActivityIntf(att: IAttachment): IActivityMonitor; virtual; abstract;
    procedure SetInterface(api: TFBClientAPI); virtual;
    function GetTrInfo(ReqBuffer: PByte; ReqBufLen: integer): ITrInformation; virtual; abstract;
  public
    constructor Create(api: TFBClientAPI; Attachments: array of IAttachment; Params: array of byte; DefaultCompletion: TTransactionAction); overload;
    constructor Create(api: TFBClientAPI; Attachments: array of IAttachment; TPB: ITPB; DefaultCompletion: TTransactionAction); overload;
    constructor Create(api: TFBClientAPI; Attachment: IAttachment; Params: array of byte; DefaultCompletion: TTransactionAction); overload;
    constructor Create(api: TFBClientAPI; Attachment: IAttachment; TPB: ITPB; DefaultCompletion: TTransactionAction); overload;
    destructor Destroy; override;
    procedure DoDefaultTransactionEnd(Force: boolean);
    property FirebirdAPI: TFBClientAPI read FFirebirdAPI;

  public
    {ITransaction}
    function getTPB: ITPB;
    procedure PrepareForCommit;virtual; abstract;
    procedure Commit(Force: boolean=false);  virtual; abstract;
    procedure CommitRetaining;  virtual; abstract;
    function GetInTransaction: boolean; virtual; abstract;
    function GetIsReadOnly: boolean;
    function GetTransactionID: integer;
    function GetAttachmentCount: integer;
    function GetAttachment(index: integer): IAttachment;
    procedure Rollback(Force: boolean=false);  virtual; abstract;
    procedure RollbackRetaining;  virtual; abstract;
    procedure Start(DefaultCompletion: TTransactionCompletion=taCommit); overload; virtual; abstract;
    procedure Start(TPB: ITPB; DefaultCompletion: TTransactionCompletion=taCommit); overload;
    function GetTrInformation(Requests: array of byte): ITrInformation; overload;
    function GetTrInformation(Request: byte): ITrInformation; overload;

    property InTransaction: boolean read GetInTransaction;
    property TransactionSeqNo: integer read FSeqNo;
  end;

  {The transaction user interface is used to force an action on the end of the
   transaction.}

  ITransactionUser = interface
    ['{156fcdc9-a326-44b3-a82d-f23c6fb9f97c}']
    procedure TransactionEnding(aTransaction: ITransaction; Force: boolean);
  end;

  { TTPBItem }

  TTPBItem = class(TParamBlockItem,ITPBItem)
  public
    function getParamTypeName: AnsiString; override;
  end;

  { TTPB }

  TTPB = class (TCustomParamBlock<TTPBItem,ITPBItem>, ITPB)
  protected
    function LookupItemType(ParamTypeName: AnsiString): byte; override;
  public
    constructor Create(api: TFBClientAPI);
    function GetParamTypeName(ParamType: byte): Ansistring;
    {$IFDEF FPC}
    function ITPB.GetDPBParamTypeName = GetParamTypeName;
    {$ELSE}
    function GetDPBParamTypeName(ParamType: byte): Ansistring;
    {$ENDIF}
end;

  {$IFDEF FPC}
  TTrInfoItem = class;

  { TTrInfoItem }

  TTrInfoItem = class(TOutputBlockItemGroup<TTrInfoItem,ITrInfoItem>,ITrInfoItem)
  {$ELSE}
    TTransInfoItem = class(TOutputBlockItemGroup<TOutputBlockItem,ITransInfoItem>,ITransInfoItem)
  {$ENDIF}
    public
      procedure DecodeTraIsolation(var IsolationType, RecVersion: byte);
  end;

  { TTrInformation }

  TTrInformation = class(TCustomOutputBlock<TTrInfoItem,ITrInfoItem>, ITrInformation)
  protected
    procedure DoParseBuffer; override;
  public
    constructor Create(api: TFBClientAPI; aSize: integer = DefaultBufferSize);
    {$IFNDEF FPC}
    function Find(ItemType: byte): ITransInfoItem;
    {$ENDIF}
  end;

implementation

uses FBMessages;

const
  isc_tpb_last_tpb_constant = isc_tpb_at_snapshot_number;

  TPBConstantNames: array[1..isc_tpb_last_tpb_constant] of string = (
    'consistency',
    'concurrency',
    'shared',
    'protected',
    'exclusive',
    'wait',
    'nowait',
    'read',
    'write',
    'lock_read',
    'lock_write',
    'verb_time',
    'commit_time',
    'ignore_limbo',
    'read_committed',
    'autocommit',
    'rec_version',
    'no_rec_version',
    'restart_requests',
    'no_auto_undo',
    'lock_timeout',
    'read_consistency',
    'at_snapshot_number'
  );

{ TFBTransaction }

function TFBTransaction.GenerateTPB(sl: array of byte): ITPB;
var
  i: Integer;
begin
  Result := TTPB.Create(FFirebirdAPI);
  for i := 0 to Length(sl) - 1 do
    Result.Add(sl[i]);
end;

procedure TFBTransaction.CheckHandle;
begin
  if not InTransaction then
    IBError(ibxeNotInTransaction,[]);
end;

procedure TFBTransaction.SetInterface(api: TFBClientAPI);
begin
  FFirebirdAPI := api;
end;

constructor TFBTransaction.Create(api: TFBClientAPI; Attachments: array of IAttachment;
  Params: array of byte; DefaultCompletion: TTransactionAction);
begin
  Create(api, Attachments,GenerateTPB(Params), DefaultCompletion);
end;

constructor TFBTransaction.Create(api: TFBClientAPI; Attachments: array of IAttachment; TPB: ITPB;
  DefaultCompletion: TTransactionAction);
var
  i: Integer;
begin
  inherited Create(nil);
  SetInterface(api);
  if Length(Attachments) = 0 then
    IBError(ibxeEmptyAttachmentsList,[nil]);

  {make sure all attachments use same Firebird API}
  for i := 0 to Length(Attachments) - 1 do
    if Attachments[i].getFirebirdAPI.GetFBLibrary.GetHandle <> FFirebirdAPI.GetFBLibrary.GetHandle then
      IBError(ibxeDifferentAPIs,[nil]);

  SetLength(FAttachments,Length(Attachments));
  for i := 0 to Length(Attachments) - 1 do
  begin
    AddMonitor(GetActivityIntf(Attachments[i]));
    FAttachments[i] := Attachments[i];
  end;
  FTPB := TPB;
  Start(DefaultCompletion);
end;

constructor TFBTransaction.Create(api: TFBClientAPI; Attachment: IAttachment;
  Params: array of byte; DefaultCompletion: TTransactionAction);
begin
  Create(api,Attachment,GenerateTPB(Params),DefaultCompletion);
end;

constructor TFBTransaction.Create(api: TFBClientAPI; Attachment: IAttachment; TPB: ITPB;
  DefaultCompletion: TTransactionAction);
begin
  inherited Create(nil);
  SetInterface(api);
  AddMonitor(GetActivityIntf(Attachment));
  SetLength(FAttachments,1);
  FAttachments[0] := Attachment;
  FTPB := TPB;
  Start(DefaultCompletion);
end;

destructor TFBTransaction.Destroy;
begin
  DoDefaultTransactionEnd(false);
  inherited Destroy;
end;

procedure TFBTransaction.DoDefaultTransactionEnd(Force: boolean);
var i: integer;
    intf: IUnknown;
    user: ITransactionUser;
begin
  if InTransaction then
  begin
    for i := 0 to InterfaceCount - 1 do
    begin
      intf := GetInterface(i);
      if (intf <> nil) and  (intf.QueryInterface(ITransactionUser,user) = S_OK) then
        user.TransactionEnding(self,Force);
    end;
    case FDefaultCompletion of
    taRollback:
      Rollback(Force);
    taCommit:
      Commit(Force);
    end;
  end;
end;

function TFBTransaction.getTPB: ITPB;
begin
  Result := FTPB;
end;

function TFBTransaction.GetIsReadOnly: boolean;
var Info: ITrInformation;
begin
  Info := GetTrInformation(isc_info_tra_access);
  if (Info.Count > 0) and (Info[0].getItemType = isc_info_tra_access) then
    Result := Info[0].getAsInteger = isc_info_tra_readonly
  else
    Result := false;
end;

function TFBTransaction.GetTransactionID: integer;
var Info: ITrInformation;
begin
  Result := -1;
  Info := GetTrInformation(isc_info_tra_id);
  if (Info.Count > 0) and (Info[0].getItemType = isc_info_tra_id) then
    Result := Info[0].getAsInteger;
end;

function TFBTransaction.GetAttachmentCount: integer;
begin
  Result := Length(FAttachments);
end;

function TFBTransaction.GetAttachment(index: integer): IAttachment;
begin
  if (index >= 0) and (index < Length(FAttachments)) then
    Result := FAttachments[index]
  else
    IBError(ibxeAttachmentListIndexError,[index]);
end;

procedure TFBTransaction.Start(TPB: ITPB; DefaultCompletion: TTransactionCompletion
  );
begin
  FTPB := TPB;
  Start(DefaultCompletion);
end;

function TFBTransaction.GetTrInformation(Requests: array of byte
  ): ITrInformation;
var ReqBuffer: PByte;
    i: integer;
begin
  CheckHandle;
  if Length(Requests) = 1 then
    Result := GetTrInformation(Requests[0])
  else
  begin
    GetMem(ReqBuffer,Length(Requests));
    try
      for i := 0 to Length(Requests) - 1 do
        ReqBuffer[i] := Requests[i];

      Result := GetTrInfo(ReqBuffer,Length(Requests));

    finally
      FreeMem(ReqBuffer);
    end;
  end;
end;

function TFBTransaction.GetTrInformation(Request: byte): ITrInformation;
begin
  CheckHandle;
  Result := GetTrInfo(@Request,1);
end;

{ TTPBItem }

function TTPBItem.getParamTypeName: AnsiString;
begin
  Result :=  TPBPrefix + TPBConstantNames[getParamType];
end;


{TTPB}

constructor TTPB.Create(api: TFBClientAPI);
begin
  inherited Create(api);
  FDataLength := 1;
  FBuffer^ := isc_tpb_version3;
end;

function TTPB.GetParamTypeName(ParamType: byte): Ansistring;
begin
  if ParamType <= isc_tpb_last_tpb_constant then
    Result := TPBConstantNames[ParamType]
  else
    Result := '';
end;

{$IFNDEF FPC}
function TTPB.GetDPBParamTypeName(ParamType: byte): Ansistring;
begin
  Result := GetParamTypeName(ParamType);
end;
{$ENDIF}


function TTPB.LookupItemType(ParamTypeName: AnsiString): byte;
var i: byte;
begin
  Result := 0;
  ParamTypeName := LowerCase(ParamTypeName);
  if (Pos(TPBPrefix, ParamTypeName) = 1) then
    Delete(ParamTypeName, 1, Length(TPBPrefix));

  for i := 1 to isc_tpb_last_tpb_constant do
    if (ParamTypeName = TPBConstantNames[i]) then
    begin
      Result := i;
      break;
    end;
end;

{ TTrInfoItem }

procedure TTrInfoItem.DecodeTraIsolation(var IsolationType, RecVersion: byte);
begin
  with FFirebirdClientAPI, ItemData^ do
  if getItemType = isc_info_tra_isolation then
  begin
    if FDataLength = 1 then
    begin
      IsolationType := getAsInteger;
      RecVersion := 0;
    end
    else
    begin
      IsolationType := (FBufPtr + 3)^;
      RecVersion := (FBufPtr + 4)^;
    end
  end
  else
    IBError(ibxeInfoBufferTypeError,[integer(FBufPtr^)]);
end;

{ TTrInformation }

procedure TTrInformation.DoParseBuffer;
var P: PByte;
    index: integer;
begin
  P := Buffer;
  index := 0;
  SetLength(FItems,0);
  while (P^ <> isc_info_end) and (P < Buffer + getBufSize) do
  begin
    SetLength(FItems,index+1);
    case byte(P^) of
    isc_info_tra_id,
    isc_info_tra_oldest_interesting,
    isc_info_tra_oldest_active,
    isc_info_tra_oldest_snapshot,
    fb_info_tra_snapshot_number,
    isc_info_tra_lock_timeout:
      FItems[index] := AddIntegerItem(P);

    isc_info_tra_isolation,
      {return transaction isolation mode of current transaction.
        format of returned clumplets is following:

        isc_info_tra_isolation,
                1, isc_info_tra_consistency | isc_info_tra_concurrency
        |
                2, isc_info_tra_read_committed,
                         isc_info_tra_no_rec_version | isc_info_tra_rec_version

        i.e. for read committed transactions returned 2 items while for
        other transactions returned 1 item}

    isc_info_tra_access:
      FItems[index] := AddIntegerItem(P);
    fb_info_tra_dbpath:
      FItems[index] := AddStringItem(P);
    else
      FItems[index] := AddItem(P);
    end;
    P := P + FItems[index]^.FSize;
    Inc(index);
  end;
end;

constructor TTrInformation.Create(api: TFBClientAPI; aSize: integer);
begin
  inherited Create(api,aSize);
  FIntegerType := dtInteger;
end;

end.

Revision:	359
Committed:	Tue Dec 7 09:37:32 2021 UTC (2 years, 11 months ago) by tony
Content type:	text/x-pascal
Original Path:	*ibx/trunk/fbintf/client/FBTransaction.pas*
File size:	15523 byte(s)
Log Message:	Fixes Merged
#	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 FBTransaction;
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
72			interface
73
74			uses
75	tony	359	Classes, SysUtils, IB, FBParamBlock, FBActivityMonitor, FBClientAPI, FBOutputBlock;
76	tony	45
77			type
78			{ TFBTransaction }
79
80			TFBTransaction = class(TActivityReporter, IActivityMonitor,ITransaction)
81			private
82	tony	263	FFirebirdAPI: TFBClientAPI;
83	tony	45	function GenerateTPB(sl: array of byte): ITPB;
84			protected
85			FTPB: ITPB;
86			FSeqNo: integer;
87			FDefaultCompletion: TTransactionAction;
88			FAttachments: array of IAttachment; {Keep reference to attachment - ensures
89			attachment cannot be freed before transaction}
90	tony	359	procedure CheckHandle;
91	tony	45	function GetActivityIntf(att: IAttachment): IActivityMonitor; virtual; abstract;
92	tony	263	procedure SetInterface(api: TFBClientAPI); virtual;
93	tony	359	function GetTrInfo(ReqBuffer: PByte; ReqBufLen: integer): ITrInformation; virtual; abstract;
94	tony	45	public
95	tony	263	constructor Create(api: TFBClientAPI; Attachments: array of IAttachment; Params: array of byte; DefaultCompletion: TTransactionAction); overload;
96			constructor Create(api: TFBClientAPI; Attachments: array of IAttachment; TPB: ITPB; DefaultCompletion: TTransactionAction); overload;
97			constructor Create(api: TFBClientAPI; Attachment: IAttachment; Params: array of byte; DefaultCompletion: TTransactionAction); overload;
98			constructor Create(api: TFBClientAPI; Attachment: IAttachment; TPB: ITPB; DefaultCompletion: TTransactionAction); overload;
99	tony	45	destructor Destroy; override;
100			procedure DoDefaultTransactionEnd(Force: boolean);
101	tony	263	property FirebirdAPI: TFBClientAPI read FFirebirdAPI;
102	tony	45
103			public
104			{ITransaction}
105			function getTPB: ITPB;
106			procedure PrepareForCommit;virtual; abstract;
107			procedure Commit(Force: boolean=false); virtual; abstract;
108			procedure CommitRetaining; virtual; abstract;
109			function GetInTransaction: boolean; virtual; abstract;
110	tony	359	function GetIsReadOnly: boolean;
111			function GetTransactionID: integer;
112	tony	45	function GetAttachmentCount: integer;
113			function GetAttachment(index: integer): IAttachment;
114			procedure Rollback(Force: boolean=false); virtual; abstract;
115			procedure RollbackRetaining; virtual; abstract;
116			procedure Start(DefaultCompletion: TTransactionCompletion=taCommit); overload; virtual; abstract;
117			procedure Start(TPB: ITPB; DefaultCompletion: TTransactionCompletion=taCommit); overload;
118	tony	359	function GetTrInformation(Requests: array of byte): ITrInformation; overload;
119			function GetTrInformation(Request: byte): ITrInformation; overload;
120	tony	45
121			property InTransaction: boolean read GetInTransaction;
122			property TransactionSeqNo: integer read FSeqNo;
123			end;
124
125	tony	315	{The transaction user interface is used to force an action on the end of the
126			transaction.}
127
128			ITransactionUser = interface
129			['{156fcdc9-a326-44b3-a82d-f23c6fb9f97c}']
130			procedure TransactionEnding(aTransaction: ITransaction; Force: boolean);
131			end;
132
133			{ TTPBItem }
134
135			TTPBItem = class(TParamBlockItem,ITPBItem)
136			public
137			function getParamTypeName: AnsiString; override;
138			end;
139
140			{ TTPB }
141
142			TTPB = class (TCustomParamBlock<TTPBItem,ITPBItem>, ITPB)
143			protected
144			function LookupItemType(ParamTypeName: AnsiString): byte; override;
145			public
146			constructor Create(api: TFBClientAPI);
147	tony	345	function GetParamTypeName(ParamType: byte): Ansistring;
148			{$IFDEF FPC}
149			function ITPB.GetDPBParamTypeName = GetParamTypeName;
150			{$ELSE}
151	tony	315	function GetDPBParamTypeName(ParamType: byte): Ansistring;
152	tony	345	{$ENDIF}
153			end;
154	tony	315
155	tony	359	{$IFDEF FPC}
156			TTrInfoItem = class;
157
158			{ TTrInfoItem }
159
160			TTrInfoItem = class(TOutputBlockItemGroup<TTrInfoItem,ITrInfoItem>,ITrInfoItem)
161			{$ELSE}
162			TTransInfoItem = class(TOutputBlockItemGroup<TOutputBlockItem,ITransInfoItem>,ITransInfoItem)
163			{$ENDIF}
164			public
165			procedure DecodeTraIsolation(var IsolationType, RecVersion: byte);
166			end;
167
168			{ TTrInformation }
169
170			TTrInformation = class(TCustomOutputBlock<TTrInfoItem,ITrInfoItem>, ITrInformation)
171			protected
172			procedure DoParseBuffer; override;
173			public
174			constructor Create(api: TFBClientAPI; aSize: integer = DefaultBufferSize);
175			{$IFNDEF FPC}
176			function Find(ItemType: byte): ITransInfoItem;
177			{$ENDIF}
178			end;
179
180	tony	45	implementation
181
182	tony	315	uses FBMessages;
183	tony	45
184	tony	315	const
185			isc_tpb_last_tpb_constant = isc_tpb_at_snapshot_number;
186
187			TPBConstantNames: array[1..isc_tpb_last_tpb_constant] of string = (
188			'consistency',
189			'concurrency',
190			'shared',
191			'protected',
192			'exclusive',
193			'wait',
194			'nowait',
195			'read',
196			'write',
197			'lock_read',
198			'lock_write',
199			'verb_time',
200			'commit_time',
201			'ignore_limbo',
202			'read_committed',
203			'autocommit',
204			'rec_version',
205			'no_rec_version',
206			'restart_requests',
207			'no_auto_undo',
208			'lock_timeout',
209			'read_consistency',
210			'at_snapshot_number'
211			);
212
213	tony	45	{ TFBTransaction }
214
215			function TFBTransaction.GenerateTPB(sl: array of byte): ITPB;
216			var
217			i: Integer;
218			begin
219	tony	263	Result := TTPB.Create(FFirebirdAPI);
220	tony	45	for i := 0 to Length(sl) - 1 do
221			Result.Add(sl[i]);
222			end;
223
224	tony	359	procedure TFBTransaction.CheckHandle;
225			begin
226			if not InTransaction then
227			IBError(ibxeNotInTransaction,[]);
228			end;
229
230	tony	263	procedure TFBTransaction.SetInterface(api: TFBClientAPI);
231			begin
232			FFirebirdAPI := api;
233			end;
234
235			constructor TFBTransaction.Create(api: TFBClientAPI; Attachments: array of IAttachment;
236	tony	45	Params: array of byte; DefaultCompletion: TTransactionAction);
237			begin
238	tony	263	Create(api, Attachments,GenerateTPB(Params), DefaultCompletion);
239	tony	45	end;
240
241	tony	263	constructor TFBTransaction.Create(api: TFBClientAPI; Attachments: array of IAttachment; TPB: ITPB;
242	tony	45	DefaultCompletion: TTransactionAction);
243			var
244			i: Integer;
245			begin
246			inherited Create(nil);
247	tony	263	SetInterface(api);
248	tony	45	if Length(Attachments) = 0 then
249			IBError(ibxeEmptyAttachmentsList,[nil]);
250
251	tony	263	{make sure all attachments use same Firebird API}
252			for i := 0 to Length(Attachments) - 1 do
253			if Attachments[i].getFirebirdAPI.GetFBLibrary.GetHandle <> FFirebirdAPI.GetFBLibrary.GetHandle then
254			IBError(ibxeDifferentAPIs,[nil]);
255
256	tony	45	SetLength(FAttachments,Length(Attachments));
257			for i := 0 to Length(Attachments) - 1 do
258			begin
259			AddMonitor(GetActivityIntf(Attachments[i]));
260			FAttachments[i] := Attachments[i];
261			end;
262			FTPB := TPB;
263			Start(DefaultCompletion);
264			end;
265
266	tony	263	constructor TFBTransaction.Create(api: TFBClientAPI; Attachment: IAttachment;
267	tony	45	Params: array of byte; DefaultCompletion: TTransactionAction);
268			begin
269	tony	263	Create(api,Attachment,GenerateTPB(Params),DefaultCompletion);
270	tony	45	end;
271
272	tony	263	constructor TFBTransaction.Create(api: TFBClientAPI; Attachment: IAttachment; TPB: ITPB;
273	tony	45	DefaultCompletion: TTransactionAction);
274			begin
275			inherited Create(nil);
276	tony	263	SetInterface(api);
277	tony	45	AddMonitor(GetActivityIntf(Attachment));
278			SetLength(FAttachments,1);
279			FAttachments[0] := Attachment;
280			FTPB := TPB;
281			Start(DefaultCompletion);
282			end;
283
284			destructor TFBTransaction.Destroy;
285			begin
286			DoDefaultTransactionEnd(false);
287			inherited Destroy;
288			end;
289
290			procedure TFBTransaction.DoDefaultTransactionEnd(Force: boolean);
291			var i: integer;
292	tony	315	intf: IUnknown;
293			user: ITransactionUser;
294	tony	45	begin
295			if InTransaction then
296			begin
297			for i := 0 to InterfaceCount - 1 do
298			begin
299			intf := GetInterface(i);
300	tony	315	if (intf <> nil) and (intf.QueryInterface(ITransactionUser,user) = S_OK) then
301			user.TransactionEnding(self,Force);
302	tony	45	end;
303			case FDefaultCompletion of
304			taRollback:
305			Rollback(Force);
306			taCommit:
307			Commit(Force);
308			end;
309			end;
310			end;
311
312			function TFBTransaction.getTPB: ITPB;
313			begin
314			Result := FTPB;
315			end;
316
317	tony	359	function TFBTransaction.GetIsReadOnly: boolean;
318			var Info: ITrInformation;
319			begin
320			Info := GetTrInformation(isc_info_tra_access);
321			if (Info.Count > 0) and (Info[0].getItemType = isc_info_tra_access) then
322			Result := Info[0].getAsInteger = isc_info_tra_readonly
323			else
324			Result := false;
325			end;
326
327			function TFBTransaction.GetTransactionID: integer;
328			var Info: ITrInformation;
329			begin
330			Result := -1;
331			Info := GetTrInformation(isc_info_tra_id);
332			if (Info.Count > 0) and (Info[0].getItemType = isc_info_tra_id) then
333			Result := Info[0].getAsInteger;
334			end;
335
336	tony	45	function TFBTransaction.GetAttachmentCount: integer;
337			begin
338			Result := Length(FAttachments);
339			end;
340
341			function TFBTransaction.GetAttachment(index: integer): IAttachment;
342			begin
343			if (index >= 0) and (index < Length(FAttachments)) then
344			Result := FAttachments[index]
345			else
346			IBError(ibxeAttachmentListIndexError,[index]);
347			end;
348
349			procedure TFBTransaction.Start(TPB: ITPB; DefaultCompletion: TTransactionCompletion
350			);
351			begin
352			FTPB := TPB;
353			Start(DefaultCompletion);
354			end;
355
356	tony	359	function TFBTransaction.GetTrInformation(Requests: array of byte
357			): ITrInformation;
358			var ReqBuffer: PByte;
359			i: integer;
360			begin
361			CheckHandle;
362			if Length(Requests) = 1 then
363			Result := GetTrInformation(Requests[0])
364			else
365			begin
366			GetMem(ReqBuffer,Length(Requests));
367			try
368			for i := 0 to Length(Requests) - 1 do
369			ReqBuffer[i] := Requests[i];
370
371			Result := GetTrInfo(ReqBuffer,Length(Requests));
372
373			finally
374			FreeMem(ReqBuffer);
375			end;
376			end;
377			end;
378
379			function TFBTransaction.GetTrInformation(Request: byte): ITrInformation;
380			begin
381			CheckHandle;
382			Result := GetTrInfo(@Request,1);
383			end;
384
385	tony	315	{ TTPBItem }
386
387			function TTPBItem.getParamTypeName: AnsiString;
388			begin
389			Result := TPBPrefix + TPBConstantNames[getParamType];
390			end;
391
392
393			{TTPB}
394
395			constructor TTPB.Create(api: TFBClientAPI);
396			begin
397			inherited Create(api);
398			FDataLength := 1;
399			FBuffer^ := isc_tpb_version3;
400			end;
401
402	tony	345	function TTPB.GetParamTypeName(ParamType: byte): Ansistring;
403	tony	315	begin
404			if ParamType <= isc_tpb_last_tpb_constant then
405			Result := TPBConstantNames[ParamType]
406			else
407			Result := '';
408			end;
409
410	tony	345	{$IFNDEF FPC}
411			function TTPB.GetDPBParamTypeName(ParamType: byte): Ansistring;
412			begin
413			Result := GetParamTypeName(ParamType);
414			end;
415			{$ENDIF}
416
417
418	tony	315	function TTPB.LookupItemType(ParamTypeName: AnsiString): byte;
419			var i: byte;
420			begin
421			Result := 0;
422			ParamTypeName := LowerCase(ParamTypeName);
423			if (Pos(TPBPrefix, ParamTypeName) = 1) then
424			Delete(ParamTypeName, 1, Length(TPBPrefix));
425
426			for i := 1 to isc_tpb_last_tpb_constant do
427			if (ParamTypeName = TPBConstantNames[i]) then
428			begin
429			Result := i;
430			break;
431			end;
432			end;
433
434	tony	359	{ TTrInfoItem }
435
436			procedure TTrInfoItem.DecodeTraIsolation(var IsolationType, RecVersion: byte);
437			begin
438			with FFirebirdClientAPI, ItemData^ do
439			if getItemType = isc_info_tra_isolation then
440			begin
441			if FDataLength = 1 then
442			begin
443			IsolationType := getAsInteger;
444			RecVersion := 0;
445			end
446			else
447			begin
448			IsolationType := (FBufPtr + 3)^;
449			RecVersion := (FBufPtr + 4)^;
450			end
451			end
452			else
453			IBError(ibxeInfoBufferTypeError,[integer(FBufPtr^)]);
454			end;
455
456			{ TTrInformation }
457
458			procedure TTrInformation.DoParseBuffer;
459			var P: PByte;
460			index: integer;
461			begin
462			P := Buffer;
463			index := 0;
464			SetLength(FItems,0);
465			while (P^ <> isc_info_end) and (P < Buffer + getBufSize) do
466			begin
467			SetLength(FItems,index+1);
468			case byte(P^) of
469			isc_info_tra_id,
470			isc_info_tra_oldest_interesting,
471			isc_info_tra_oldest_active,
472			isc_info_tra_oldest_snapshot,
473			fb_info_tra_snapshot_number,
474			isc_info_tra_lock_timeout:
475			FItems[index] := AddIntegerItem(P);
476
477			isc_info_tra_isolation,
478			{return transaction isolation mode of current transaction.
479			format of returned clumplets is following:
480
481			isc_info_tra_isolation,
482			1, isc_info_tra_consistency \| isc_info_tra_concurrency
483			\|
484			2, isc_info_tra_read_committed,
485			isc_info_tra_no_rec_version \| isc_info_tra_rec_version
486
487			i.e. for read committed transactions returned 2 items while for
488			other transactions returned 1 item}
489
490			isc_info_tra_access:
491			FItems[index] := AddIntegerItem(P);
492			fb_info_tra_dbpath:
493			FItems[index] := AddStringItem(P);
494			else
495			FItems[index] := AddItem(P);
496			end;
497			P := P + FItems[index]^.FSize;
498			Inc(index);
499			end;
500			end;
501
502			constructor TTrInformation.Create(api: TFBClientAPI; aSize: integer);
503			begin
504			inherited Create(api,aSize);
505			FIntegerType := dtInteger;
506			end;
507
508	tony	45	end.
509