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:	362
Committed:	Tue Dec 7 13:27:39 2021 UTC (2 years, 11 months ago) by tony
Content type:	text/x-pascal
Original Path:	*ibx/branches/journaling/fbintf/client/FBTransaction.pas*
File size:	15523 byte(s)
Log Message:	initiate test release
#	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 FBTransaction;
63	{$IFDEF MSWINDOWS}
64	{$DEFINE WINDOWS}
65	{$ENDIF}
66
67	{$IFDEF FPC}
68	{$mode delphi}
69	{$interfaces COM}
70	{$ENDIF}
71
72	interface
73
74	uses
75	Classes, SysUtils, IB, FBParamBlock, FBActivityMonitor, FBClientAPI, FBOutputBlock;
76
77	type
78	{ TFBTransaction }
79
80	TFBTransaction = class(TActivityReporter, IActivityMonitor,ITransaction)
81	private
82	FFirebirdAPI: TFBClientAPI;
83	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	procedure CheckHandle;
91	function GetActivityIntf(att: IAttachment): IActivityMonitor; virtual; abstract;
92	procedure SetInterface(api: TFBClientAPI); virtual;
93	function GetTrInfo(ReqBuffer: PByte; ReqBufLen: integer): ITrInformation; virtual; abstract;
94	public
95	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	destructor Destroy; override;
100	procedure DoDefaultTransactionEnd(Force: boolean);
101	property FirebirdAPI: TFBClientAPI read FFirebirdAPI;
102
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	function GetIsReadOnly: boolean;
111	function GetTransactionID: integer;
112	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	function GetTrInformation(Requests: array of byte): ITrInformation; overload;
119	function GetTrInformation(Request: byte): ITrInformation; overload;
120
121	property InTransaction: boolean read GetInTransaction;
122	property TransactionSeqNo: integer read FSeqNo;
123	end;
124
125	{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	function GetParamTypeName(ParamType: byte): Ansistring;
148	{$IFDEF FPC}
149	function ITPB.GetDPBParamTypeName = GetParamTypeName;
150	{$ELSE}
151	function GetDPBParamTypeName(ParamType: byte): Ansistring;
152	{$ENDIF}
153	end;
154
155	{$IFDEF FPC}
156	TTrInfoItem = class;
157
158	{ TTrInfoItem }
159
160	TTrInfoItem = class(TOutputBlockItemGroup<TTrInfoItem,ITrInfoItem>,ITrInfoItem)
161	{$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	implementation
181
182	uses FBMessages;
183
184	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	{ TFBTransaction }
214
215	function TFBTransaction.GenerateTPB(sl: array of byte): ITPB;
216	var
217	i: Integer;
218	begin
219	Result := TTPB.Create(FFirebirdAPI);
220	for i := 0 to Length(sl) - 1 do
221	Result.Add(sl[i]);
222	end;
223
224	procedure TFBTransaction.CheckHandle;
225	begin
226	if not InTransaction then
227	IBError(ibxeNotInTransaction,[]);
228	end;
229
230	procedure TFBTransaction.SetInterface(api: TFBClientAPI);
231	begin
232	FFirebirdAPI := api;
233	end;
234
235	constructor TFBTransaction.Create(api: TFBClientAPI; Attachments: array of IAttachment;
236	Params: array of byte; DefaultCompletion: TTransactionAction);
237	begin
238	Create(api, Attachments,GenerateTPB(Params), DefaultCompletion);
239	end;
240
241	constructor TFBTransaction.Create(api: TFBClientAPI; Attachments: array of IAttachment; TPB: ITPB;
242	DefaultCompletion: TTransactionAction);
243	var
244	i: Integer;
245	begin
246	inherited Create(nil);
247	SetInterface(api);
248	if Length(Attachments) = 0 then
249	IBError(ibxeEmptyAttachmentsList,[nil]);
250
251	{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	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	constructor TFBTransaction.Create(api: TFBClientAPI; Attachment: IAttachment;
267	Params: array of byte; DefaultCompletion: TTransactionAction);
268	begin
269	Create(api,Attachment,GenerateTPB(Params),DefaultCompletion);
270	end;
271
272	constructor TFBTransaction.Create(api: TFBClientAPI; Attachment: IAttachment; TPB: ITPB;
273	DefaultCompletion: TTransactionAction);
274	begin
275	inherited Create(nil);
276	SetInterface(api);
277	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	intf: IUnknown;
293	user: ITransactionUser;
294	begin
295	if InTransaction then
296	begin
297	for i := 0 to InterfaceCount - 1 do
298	begin
299	intf := GetInterface(i);
300	if (intf <> nil) and (intf.QueryInterface(ITransactionUser,user) = S_OK) then
301	user.TransactionEnding(self,Force);
302	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	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	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	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	{ 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	function TTPB.GetParamTypeName(ParamType: byte): Ansistring;
403	begin
404	if ParamType <= isc_tpb_last_tpb_constant then
405	Result := TPBConstantNames[ParamType]
406	else
407	Result := '';
408	end;
409
410	{$IFNDEF FPC}
411	function TTPB.GetDPBParamTypeName(ParamType: byte): Ansistring;
412	begin
413	Result := GetParamTypeName(ParamType);
414	end;
415	{$ENDIF}
416
417
418	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	{ 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	end.
509