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root/public/ibx/branches/udr/client/FBTransaction.pas

Comparing ibx/trunk/fbintf/client/FBTransaction.pas (file contents):
Revision 56 by tony, Mon Mar 6 10:20:02 2017 UTC vs.
Revision 315 by tony, Thu Feb 25 11:56:36 2021 UTC

#	Line 72 | Line 72 | unit FBTransaction;
72		interface
73
74		uses
75	<	Classes, SysUtils, IB, FBParamBlock, FBActivityMonitor;
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;
#	Line 87 | Line 88 | type
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(Attachments: array of IAttachment; Params: array of byte; DefaultCompletion: TTransactionAction); overload;
94	<	constructor Create(Attachments: array of IAttachment; TPB: ITPB; DefaultCompletion: TTransactionAction); overload;
95	<	constructor Create(Attachment: IAttachment; Params: array of byte; DefaultCompletion: TTransactionAction); overload;
96	<	constructor Create(Attachment: IAttachment; TPB: ITPB; DefaultCompletion: TTransactionAction); overload;
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}
#	Line 113 | Line 116 | type
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, FBStatement;
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
#	Line 123 | Line 180 | function TFBTransaction.GenerateTPB(sl:
180		var
181		i: Integer;
182		begin
183	<	Result := TTPB.Create;
183	>	Result := TTPB.Create(FFirebirdAPI);
184		for i := 0 to Length(sl) - 1 do
185		Result.Add(sl[i]);
186		end;
187
188	<	constructor TFBTransaction.Create(Attachments: array of IAttachment;
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(Attachments,GenerateTPB(Params), DefaultCompletion);
196	>	Create(api, Attachments,GenerateTPB(Params), DefaultCompletion);
197		end;
198
199	<	constructor TFBTransaction.Create(Attachments: array of IAttachment; TPB: ITPB;
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
#	Line 153 | Line 221 | begin
221		Start(DefaultCompletion);
222		end;
223
224	<	constructor TFBTransaction.Create(Attachment: IAttachment;
224	>	constructor TFBTransaction.Create(api: TFBClientAPI; Attachment: IAttachment;
225		Params: array of byte; DefaultCompletion: TTransactionAction);
226		begin
227	<	Create(Attachment,GenerateTPB(Params),DefaultCompletion);
227	>	Create(api,Attachment,GenerateTPB(Params),DefaultCompletion);
228		end;
229
230	<	constructor TFBTransaction.Create(Attachment: IAttachment; TPB: ITPB;
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;
#	Line 178 | Line 247 | end;
247
248		procedure TFBTransaction.DoDefaultTransactionEnd(Force: boolean);
249		var i: integer;
250	<	intf: TInterfacedObject;
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 is TFBStatement) then
259	<	TFBStatement(intf).TransactionEnding(self,Force);
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:
#	Line 222 | Line 292 | begin
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

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