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;
|
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 |
function GetActivityIntf(att: IAttachment): IActivityMonitor; virtual; abstract;
|
91 |
procedure SetInterface(api: TFBClientAPI); virtual;
|
92 |
public
|
93 |
constructor Create(api: TFBClientAPI; Attachments: array of IAttachment; Params: array of byte; DefaultCompletion: TTransactionAction); overload;
|
94 |
constructor Create(api: TFBClientAPI; Attachments: array of IAttachment; TPB: ITPB; DefaultCompletion: TTransactionAction); overload;
|
95 |
constructor Create(api: TFBClientAPI; Attachment: IAttachment; Params: array of byte; DefaultCompletion: TTransactionAction); overload;
|
96 |
constructor Create(api: TFBClientAPI; Attachment: IAttachment; TPB: ITPB; DefaultCompletion: TTransactionAction); overload;
|
97 |
destructor Destroy; override;
|
98 |
procedure DoDefaultTransactionEnd(Force: boolean);
|
99 |
property FirebirdAPI: TFBClientAPI read FFirebirdAPI;
|
100 |
|
101 |
public
|
102 |
{ITransaction}
|
103 |
function getTPB: ITPB;
|
104 |
procedure PrepareForCommit;virtual; abstract;
|
105 |
procedure Commit(Force: boolean=false); virtual; abstract;
|
106 |
procedure CommitRetaining; virtual; abstract;
|
107 |
function GetInTransaction: boolean; virtual; abstract;
|
108 |
function GetAttachmentCount: integer;
|
109 |
function GetAttachment(index: integer): IAttachment;
|
110 |
procedure Rollback(Force: boolean=false); virtual; abstract;
|
111 |
procedure RollbackRetaining; virtual; abstract;
|
112 |
procedure Start(DefaultCompletion: TTransactionCompletion=taCommit); overload; virtual; abstract;
|
113 |
procedure Start(TPB: ITPB; DefaultCompletion: TTransactionCompletion=taCommit); overload;
|
114 |
|
115 |
property InTransaction: boolean read GetInTransaction;
|
116 |
property TransactionSeqNo: integer read FSeqNo;
|
117 |
end;
|
118 |
|
119 |
{The transaction user interface is used to force an action on the end of the
|
120 |
transaction.}
|
121 |
|
122 |
ITransactionUser = interface
|
123 |
['{156fcdc9-a326-44b3-a82d-f23c6fb9f97c}']
|
124 |
procedure TransactionEnding(aTransaction: ITransaction; Force: boolean);
|
125 |
end;
|
126 |
|
127 |
{ TTPBItem }
|
128 |
|
129 |
TTPBItem = class(TParamBlockItem,ITPBItem)
|
130 |
public
|
131 |
function getParamTypeName: AnsiString; override;
|
132 |
end;
|
133 |
|
134 |
{ TTPB }
|
135 |
|
136 |
TTPB = class (TCustomParamBlock<TTPBItem,ITPBItem>, ITPB)
|
137 |
protected
|
138 |
function LookupItemType(ParamTypeName: AnsiString): byte; override;
|
139 |
public
|
140 |
constructor Create(api: TFBClientAPI);
|
141 |
function GetDPBParamTypeName(ParamType: byte): Ansistring;
|
142 |
end;
|
143 |
|
144 |
implementation
|
145 |
|
146 |
uses FBMessages;
|
147 |
|
148 |
const
|
149 |
isc_tpb_last_tpb_constant = isc_tpb_at_snapshot_number;
|
150 |
|
151 |
TPBConstantNames: array[1..isc_tpb_last_tpb_constant] of string = (
|
152 |
'consistency',
|
153 |
'concurrency',
|
154 |
'shared',
|
155 |
'protected',
|
156 |
'exclusive',
|
157 |
'wait',
|
158 |
'nowait',
|
159 |
'read',
|
160 |
'write',
|
161 |
'lock_read',
|
162 |
'lock_write',
|
163 |
'verb_time',
|
164 |
'commit_time',
|
165 |
'ignore_limbo',
|
166 |
'read_committed',
|
167 |
'autocommit',
|
168 |
'rec_version',
|
169 |
'no_rec_version',
|
170 |
'restart_requests',
|
171 |
'no_auto_undo',
|
172 |
'lock_timeout',
|
173 |
'read_consistency',
|
174 |
'at_snapshot_number'
|
175 |
);
|
176 |
|
177 |
{ TFBTransaction }
|
178 |
|
179 |
function TFBTransaction.GenerateTPB(sl: array of byte): ITPB;
|
180 |
var
|
181 |
i: Integer;
|
182 |
begin
|
183 |
Result := TTPB.Create(FFirebirdAPI);
|
184 |
for i := 0 to Length(sl) - 1 do
|
185 |
Result.Add(sl[i]);
|
186 |
end;
|
187 |
|
188 |
procedure TFBTransaction.SetInterface(api: TFBClientAPI);
|
189 |
begin
|
190 |
FFirebirdAPI := api;
|
191 |
end;
|
192 |
|
193 |
constructor TFBTransaction.Create(api: TFBClientAPI; Attachments: array of IAttachment;
|
194 |
Params: array of byte; DefaultCompletion: TTransactionAction);
|
195 |
begin
|
196 |
Create(api, Attachments,GenerateTPB(Params), DefaultCompletion);
|
197 |
end;
|
198 |
|
199 |
constructor TFBTransaction.Create(api: TFBClientAPI; Attachments: array of IAttachment; TPB: ITPB;
|
200 |
DefaultCompletion: TTransactionAction);
|
201 |
var
|
202 |
i: Integer;
|
203 |
begin
|
204 |
inherited Create(nil);
|
205 |
SetInterface(api);
|
206 |
if Length(Attachments) = 0 then
|
207 |
IBError(ibxeEmptyAttachmentsList,[nil]);
|
208 |
|
209 |
{make sure all attachments use same Firebird API}
|
210 |
for i := 0 to Length(Attachments) - 1 do
|
211 |
if Attachments[i].getFirebirdAPI.GetFBLibrary.GetHandle <> FFirebirdAPI.GetFBLibrary.GetHandle then
|
212 |
IBError(ibxeDifferentAPIs,[nil]);
|
213 |
|
214 |
SetLength(FAttachments,Length(Attachments));
|
215 |
for i := 0 to Length(Attachments) - 1 do
|
216 |
begin
|
217 |
AddMonitor(GetActivityIntf(Attachments[i]));
|
218 |
FAttachments[i] := Attachments[i];
|
219 |
end;
|
220 |
FTPB := TPB;
|
221 |
Start(DefaultCompletion);
|
222 |
end;
|
223 |
|
224 |
constructor TFBTransaction.Create(api: TFBClientAPI; Attachment: IAttachment;
|
225 |
Params: array of byte; DefaultCompletion: TTransactionAction);
|
226 |
begin
|
227 |
Create(api,Attachment,GenerateTPB(Params),DefaultCompletion);
|
228 |
end;
|
229 |
|
230 |
constructor TFBTransaction.Create(api: TFBClientAPI; Attachment: IAttachment; TPB: ITPB;
|
231 |
DefaultCompletion: TTransactionAction);
|
232 |
begin
|
233 |
inherited Create(nil);
|
234 |
SetInterface(api);
|
235 |
AddMonitor(GetActivityIntf(Attachment));
|
236 |
SetLength(FAttachments,1);
|
237 |
FAttachments[0] := Attachment;
|
238 |
FTPB := TPB;
|
239 |
Start(DefaultCompletion);
|
240 |
end;
|
241 |
|
242 |
destructor TFBTransaction.Destroy;
|
243 |
begin
|
244 |
DoDefaultTransactionEnd(false);
|
245 |
inherited Destroy;
|
246 |
end;
|
247 |
|
248 |
procedure TFBTransaction.DoDefaultTransactionEnd(Force: boolean);
|
249 |
var i: integer;
|
250 |
intf: IUnknown;
|
251 |
user: ITransactionUser;
|
252 |
begin
|
253 |
if InTransaction then
|
254 |
begin
|
255 |
for i := 0 to InterfaceCount - 1 do
|
256 |
begin
|
257 |
intf := GetInterface(i);
|
258 |
if (intf <> nil) and (intf.QueryInterface(ITransactionUser,user) = S_OK) then
|
259 |
user.TransactionEnding(self,Force);
|
260 |
end;
|
261 |
case FDefaultCompletion of
|
262 |
taRollback:
|
263 |
Rollback(Force);
|
264 |
taCommit:
|
265 |
Commit(Force);
|
266 |
end;
|
267 |
end;
|
268 |
end;
|
269 |
|
270 |
function TFBTransaction.getTPB: ITPB;
|
271 |
begin
|
272 |
Result := FTPB;
|
273 |
end;
|
274 |
|
275 |
function TFBTransaction.GetAttachmentCount: integer;
|
276 |
begin
|
277 |
Result := Length(FAttachments);
|
278 |
end;
|
279 |
|
280 |
function TFBTransaction.GetAttachment(index: integer): IAttachment;
|
281 |
begin
|
282 |
if (index >= 0) and (index < Length(FAttachments)) then
|
283 |
Result := FAttachments[index]
|
284 |
else
|
285 |
IBError(ibxeAttachmentListIndexError,[index]);
|
286 |
end;
|
287 |
|
288 |
procedure TFBTransaction.Start(TPB: ITPB; DefaultCompletion: TTransactionCompletion
|
289 |
);
|
290 |
begin
|
291 |
FTPB := TPB;
|
292 |
Start(DefaultCompletion);
|
293 |
end;
|
294 |
|
295 |
{ TTPBItem }
|
296 |
|
297 |
function TTPBItem.getParamTypeName: AnsiString;
|
298 |
begin
|
299 |
Result := TPBPrefix + TPBConstantNames[getParamType];
|
300 |
end;
|
301 |
|
302 |
|
303 |
{TTPB}
|
304 |
|
305 |
constructor TTPB.Create(api: TFBClientAPI);
|
306 |
begin
|
307 |
inherited Create(api);
|
308 |
FDataLength := 1;
|
309 |
FBuffer^ := isc_tpb_version3;
|
310 |
end;
|
311 |
|
312 |
function TTPB.GetDPBParamTypeName(ParamType: byte): Ansistring;
|
313 |
begin
|
314 |
if ParamType <= isc_tpb_last_tpb_constant then
|
315 |
Result := TPBConstantNames[ParamType]
|
316 |
else
|
317 |
Result := '';
|
318 |
end;
|
319 |
|
320 |
function TTPB.LookupItemType(ParamTypeName: AnsiString): byte;
|
321 |
var i: byte;
|
322 |
begin
|
323 |
Result := 0;
|
324 |
ParamTypeName := LowerCase(ParamTypeName);
|
325 |
if (Pos(TPBPrefix, ParamTypeName) = 1) then
|
326 |
Delete(ParamTypeName, 1, Length(TPBPrefix));
|
327 |
|
328 |
for i := 1 to isc_tpb_last_tpb_constant do
|
329 |
if (ParamTypeName = TPBConstantNames[i]) then
|
330 |
begin
|
331 |
Result := i;
|
332 |
break;
|
333 |
end;
|
334 |
end;
|
335 |
|
336 |
end.
|
337 |
|