1 |
{************************************************************************}
|
2 |
{ }
|
3 |
{ Borland Delphi Visual Component Library }
|
4 |
{ InterBase Express core components }
|
5 |
{ }
|
6 |
{ Copyright (c) 1998-2000 Inprise Corporation }
|
7 |
{ }
|
8 |
{ InterBase Express is based in part on the product }
|
9 |
{ Free IB Components, written by Gregory H. Deatz for }
|
10 |
{ Hoagland, Longo, Moran, Dunst & Doukas Company. }
|
11 |
{ Free IB Components is used under license. }
|
12 |
{ }
|
13 |
{ The contents of this file are subject to the InterBase }
|
14 |
{ Public License Version 1.0 (the "License"); you may not }
|
15 |
{ use this file except in compliance with the License. You }
|
16 |
{ may obtain a copy of the License at http://www.Inprise.com/IPL.html }
|
17 |
{ Software distributed under the License is distributed on }
|
18 |
{ an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either }
|
19 |
{ express or implied. See the License for the specific language }
|
20 |
{ governing rights and limitations under the License. }
|
21 |
{ The Original Code was created by InterBase Software Corporation }
|
22 |
{ and its successors. }
|
23 |
{ Portions created by Inprise Corporation are Copyright (C) Inprise }
|
24 |
{ Corporation. All Rights Reserved. }
|
25 |
{ Contributor(s): Jeff Overcash }
|
26 |
{ }
|
27 |
{************************************************************************}
|
28 |
|
29 |
unit IBStoredProc;
|
30 |
|
31 |
interface
|
32 |
|
33 |
uses Windows, SysUtils, Graphics, Classes, Controls, Db, StdVCL, IB,
|
34 |
IBDatabase, IBCustomDataSet, IBHeader, IBSQL, IBUtils;
|
35 |
|
36 |
{ TIBStoredProc }
|
37 |
type
|
38 |
|
39 |
TIBStoredProc = class(TIBCustomDataSet)
|
40 |
private
|
41 |
FIBLoaded: Boolean;
|
42 |
FStmtHandle: TISC_STMT_HANDLE;
|
43 |
FProcName: string;
|
44 |
FParams: TParams;
|
45 |
FPrepared: Boolean;
|
46 |
FNameList: TStrings;
|
47 |
procedure SetParamsList(Value: TParams);
|
48 |
procedure FreeStatement;
|
49 |
function GetStoredProcedureNames: TStrings;
|
50 |
procedure GetStoredProcedureNamesFromServer;
|
51 |
procedure CreateParamDesc;
|
52 |
procedure SetParams;
|
53 |
procedure SetParamsFromCursor;
|
54 |
procedure GenerateSQL;
|
55 |
procedure FetchDataIntoOutputParams;
|
56 |
procedure ReadParamData(Reader: TReader);
|
57 |
procedure WriteParamData(Writer: TWriter);
|
58 |
|
59 |
protected
|
60 |
{ IProviderSupport }
|
61 |
procedure PSExecute; override;
|
62 |
function PSGetTableName: string; override;
|
63 |
function PSGetParams: TParams; override;
|
64 |
procedure PSSetCommandText(const CommandText: string); override;
|
65 |
procedure PSSetParams(AParams: TParams); override;
|
66 |
|
67 |
procedure DefineProperties(Filer: TFiler); override;
|
68 |
procedure SetFiltered(Value: Boolean); override;
|
69 |
function GetParamsCount: Word;
|
70 |
procedure SetPrepared(Value: Boolean);
|
71 |
procedure SetPrepare(Value: Boolean);
|
72 |
procedure SetProcName(Value: string);
|
73 |
procedure Disconnect; override;
|
74 |
procedure InternalOpen; override;
|
75 |
|
76 |
public
|
77 |
constructor Create(AOwner: TComponent); override;
|
78 |
destructor Destroy; override;
|
79 |
procedure CopyParams(Value: TParams);
|
80 |
procedure ExecProc;
|
81 |
function ParamByName(const Value: string): TParam;
|
82 |
procedure Prepare;
|
83 |
procedure UnPrepare;
|
84 |
property ParamCount: Word read GetParamsCount;
|
85 |
property StmtHandle: TISC_STMT_HANDLE read FStmtHandle;
|
86 |
property Prepared: Boolean read FPrepared write SetPrepare;
|
87 |
property StoredProcedureNames: TStrings read GetStoredProcedureNames;
|
88 |
|
89 |
published
|
90 |
property StoredProcName: string read FProcName write SetProcName;
|
91 |
property Params: TParams read FParams write SetParamsList;
|
92 |
property Filtered;
|
93 |
|
94 |
property BeforeDatabaseDisconnect;
|
95 |
property AfterDatabaseDisconnect;
|
96 |
property DatabaseFree;
|
97 |
property BeforeTransactionEnd;
|
98 |
property AfterTransactionEnd;
|
99 |
property TransactionFree;
|
100 |
property OnFilterRecord;
|
101 |
end;
|
102 |
|
103 |
implementation
|
104 |
|
105 |
uses
|
106 |
IBIntf;
|
107 |
|
108 |
{ TIBStoredProc }
|
109 |
|
110 |
constructor TIBStoredProc.Create(AOwner: TComponent);
|
111 |
begin
|
112 |
inherited Create(AOwner);
|
113 |
FIBLoaded := False;
|
114 |
CheckIBLoaded;
|
115 |
FIBLoaded := True;
|
116 |
FParams := TParams.Create (self);
|
117 |
FNameList := TStringList.Create;
|
118 |
end;
|
119 |
|
120 |
destructor TIBStoredProc.Destroy;
|
121 |
begin
|
122 |
if FIBLoaded then
|
123 |
begin
|
124 |
Destroying;
|
125 |
Disconnect;
|
126 |
FParams.Free;
|
127 |
FNameList.Destroy;
|
128 |
end;
|
129 |
inherited Destroy;
|
130 |
end;
|
131 |
|
132 |
procedure TIBStoredProc.Disconnect;
|
133 |
begin
|
134 |
Close;
|
135 |
UnPrepare;
|
136 |
end;
|
137 |
|
138 |
procedure TIBStoredProc.ExecProc;
|
139 |
var
|
140 |
DidActivate: Boolean;
|
141 |
begin
|
142 |
CheckInActive;
|
143 |
if StoredProcName = '' then
|
144 |
IBError(ibxeNoStoredProcName, [nil]);
|
145 |
ActivateConnection;
|
146 |
DidActivate := ActivateTransaction;
|
147 |
try
|
148 |
SetPrepared(True);
|
149 |
if DataSource <> nil then SetParamsFromCursor;
|
150 |
if FParams.Count > 0 then SetParams;
|
151 |
InternalExecQuery;
|
152 |
FetchDataIntoOutputParams;
|
153 |
finally
|
154 |
if DidActivate then
|
155 |
DeactivateTransaction;
|
156 |
end;
|
157 |
end;
|
158 |
|
159 |
procedure TIBStoredProc.SetProcName(Value: string);
|
160 |
begin
|
161 |
if not (csReading in ComponentState) then
|
162 |
begin
|
163 |
CheckInactive;
|
164 |
if Value <> FProcName then
|
165 |
begin
|
166 |
FProcName := Value;
|
167 |
FreeStatement;
|
168 |
FParams.Clear;
|
169 |
if (Value <> '') and
|
170 |
(Database <> nil) then
|
171 |
GenerateSQL;
|
172 |
end;
|
173 |
end else begin
|
174 |
FProcName := Value;
|
175 |
if (Value <> '') and
|
176 |
(Database <> nil) then
|
177 |
GenerateSQL;
|
178 |
end;
|
179 |
end;
|
180 |
|
181 |
function TIBStoredProc.GetParamsCount: Word;
|
182 |
begin
|
183 |
Result := FParams.Count;
|
184 |
end;
|
185 |
|
186 |
procedure TIBStoredProc.SetFiltered(Value: Boolean);
|
187 |
begin
|
188 |
if(Filtered <> Value) then
|
189 |
begin
|
190 |
inherited SetFiltered(value);
|
191 |
if Active then
|
192 |
begin
|
193 |
Close;
|
194 |
Open;
|
195 |
end;
|
196 |
end
|
197 |
else
|
198 |
inherited SetFiltered(value);
|
199 |
end;
|
200 |
|
201 |
procedure TIBStoredProc.GenerateSQL;
|
202 |
var
|
203 |
Query : TIBSQL;
|
204 |
input : string;
|
205 |
begin
|
206 |
ActivateConnection;
|
207 |
Database.InternalTransaction.StartTransaction;
|
208 |
Query := TIBSQL.Create(self);
|
209 |
try
|
210 |
Query.Database := DataBase;
|
211 |
Query.Transaction := Database.InternalTransaction;
|
212 |
Query.SQL.Text := 'SELECT RDB$PARAMETER_NAME, RDB$PARAMETER_TYPE ' + {do not localize}
|
213 |
'FROM RDB$PROCEDURE_PARAMETERS ' + {do not localize}
|
214 |
'WHERE RDB$PROCEDURE_NAME = ' + {do not localize}
|
215 |
'''' + FormatIdentifierValue(Database.SQLDialect, FProcName) + '''' +
|
216 |
' ORDER BY RDB$PARAMETER_NUMBER'; {do not localize}
|
217 |
Query.Prepare;
|
218 |
Query.GoToFirstRecordOnExecute := False;
|
219 |
Query.ExecQuery;
|
220 |
while (not Query.EOF) and (Query.Next <> nil) do begin
|
221 |
if (Query.Current.ByName('RDB$PARAMETER_TYPE').AsInteger = 0) then begin {do not localize}
|
222 |
if (input <> '') then
|
223 |
input := input + ', :' +
|
224 |
FormatIdentifier(Database.SQLDialect, Query.Current.ByName('RDB$PARAMETER_NAME').AsString) else {do not localize}
|
225 |
input := ':' +
|
226 |
FormatIdentifier(Database.SQLDialect, Query.Current.ByName('RDB$PARAMETER_NAME').AsString); {do not localize}
|
227 |
end
|
228 |
end;
|
229 |
SelectSQL.Text := 'Execute Procedure ' + {do not localize}
|
230 |
FormatIdentifier(Database.SQLDialect, FProcName) + ' ' + input;
|
231 |
finally
|
232 |
Query.Free;
|
233 |
Database.InternalTransaction.Commit;
|
234 |
end;
|
235 |
end;
|
236 |
|
237 |
procedure TIBStoredProc.CreateParamDesc;
|
238 |
var
|
239 |
i : integer;
|
240 |
DataType : TFieldType;
|
241 |
begin
|
242 |
DataType := ftUnknown;
|
243 |
for i := 0 to QSelect.Current.Count - 1 do begin
|
244 |
case QSelect.Fields[i].SQLtype of
|
245 |
SQL_TYPE_DATE: DataType := ftDate;
|
246 |
SQL_TYPE_TIME: DataType := ftTime;
|
247 |
SQL_TIMESTAMP: DataType := ftDateTime;
|
248 |
SQL_SHORT:
|
249 |
if ((QSelect.Fields[i].AsXSQLVar)^.sqlscale = 0) then
|
250 |
DataType := ftSmallInt
|
251 |
else
|
252 |
DataType := ftBCD;
|
253 |
SQL_LONG:
|
254 |
if ((QSelect.Fields[i].AsXSQLVar)^.sqlscale = 0) then
|
255 |
DataType := ftInteger
|
256 |
else if ((QSelect.Fields[i].AsXSQLVar)^.sqlscale >= (-4)) then
|
257 |
DataType := ftBCD
|
258 |
else
|
259 |
DataType := ftFloat;
|
260 |
SQL_INT64:
|
261 |
if ((QSelect.Fields[i].AsXSQLVar)^.sqlscale = 0) then
|
262 |
DataType := ftLargeInt
|
263 |
else if ((QSelect.Fields[i].AsXSQLVar)^.sqlscale >= (-4)) then
|
264 |
DataType := ftBCD
|
265 |
else
|
266 |
DataType := ftFloat;
|
267 |
SQL_DOUBLE, SQL_FLOAT, SQL_D_FLOAT: DataType := ftFloat;
|
268 |
SQL_TEXT: DataType := ftString;
|
269 |
SQL_VARYING:
|
270 |
if ((QSelect.Fields[i].AsXSQLVar)^.sqllen < 1024) then
|
271 |
DataType := ftString
|
272 |
else DataType := ftBlob;
|
273 |
SQL_BLOB, SQL_ARRAY, SQL_QUAD: DataType := ftBlob;
|
274 |
end;
|
275 |
FParams.CreateParam(DataType, Trim(QSelect.Fields[i].Name), ptOutput);
|
276 |
end;
|
277 |
|
278 |
DataType := ftUnknown;
|
279 |
for i := 0 to QSelect.Params.Count - 1 do begin
|
280 |
case QSelect.Params[i].SQLtype of
|
281 |
SQL_TYPE_DATE: DataType := ftDate;
|
282 |
SQL_TYPE_TIME: DataType := ftTime;
|
283 |
SQL_TIMESTAMP: DataType := ftDateTime;
|
284 |
SQL_SHORT:
|
285 |
if ((QSelect.Params[i].AsXSQLVar)^.sqlscale = 0) then
|
286 |
DataType := ftSmallInt
|
287 |
else
|
288 |
DataType := ftBCD;
|
289 |
SQL_LONG:
|
290 |
if ((QSelect.Params[i].AsXSQLVar)^.sqlscale = 0) then
|
291 |
DataType := ftInteger
|
292 |
else if ((QSelect.Params[i].AsXSQLVar)^.sqlscale >= (-4)) then
|
293 |
DataType := ftBCD
|
294 |
else DataType := ftFloat;
|
295 |
SQL_INT64:
|
296 |
if ((QSelect.Params[i].AsXSQLVar)^.sqlscale = 0) then
|
297 |
DataType := ftLargeInt
|
298 |
else if ((QSelect.Params[i].AsXSQLVar)^.sqlscale >= (-4)) then
|
299 |
DataType := ftBCD
|
300 |
else DataType := ftFloat;
|
301 |
SQL_DOUBLE, SQL_FLOAT, SQL_D_FLOAT: DataType := ftFloat;
|
302 |
SQL_TEXT: DataType := ftString;
|
303 |
SQL_VARYING:
|
304 |
if ((QSelect.Params[i].AsXSQLVar)^.sqllen < 1024) then
|
305 |
DataType := ftString
|
306 |
else DataType := ftBlob;
|
307 |
SQL_BLOB, SQL_ARRAY, SQL_QUAD: DataType := ftBlob;
|
308 |
end;
|
309 |
FParams.CreateParam(DataType, Trim(QSelect.Params[i].Name), ptInput);
|
310 |
end;
|
311 |
end;
|
312 |
|
313 |
procedure TIBStoredProc.SetPrepared(Value: Boolean);
|
314 |
begin
|
315 |
if Prepared <> Value then
|
316 |
begin
|
317 |
if Value then
|
318 |
try
|
319 |
if SelectSQL.Text = '' then GenerateSQL;
|
320 |
InternalPrepare;
|
321 |
if FParams.Count = 0 then CreateParamDesc;
|
322 |
FPrepared := True;
|
323 |
except
|
324 |
FreeStatement;
|
325 |
raise;
|
326 |
end
|
327 |
else FreeStatement;
|
328 |
end;
|
329 |
|
330 |
end;
|
331 |
|
332 |
procedure TIBStoredProc.Prepare;
|
333 |
begin
|
334 |
SetPrepared(True);
|
335 |
end;
|
336 |
|
337 |
procedure TIBStoredProc.UnPrepare;
|
338 |
begin
|
339 |
SetPrepared(False);
|
340 |
end;
|
341 |
|
342 |
procedure TIBStoredProc.FreeStatement;
|
343 |
begin
|
344 |
InternalUnPrepare;
|
345 |
FPrepared := False;
|
346 |
end;
|
347 |
|
348 |
procedure TIBStoredProc.SetPrepare(Value: Boolean);
|
349 |
begin
|
350 |
if Value then Prepare
|
351 |
else UnPrepare;
|
352 |
end;
|
353 |
|
354 |
procedure TIBStoredProc.CopyParams(Value: TParams);
|
355 |
begin
|
356 |
if not Prepared and (FParams.Count = 0) then
|
357 |
try
|
358 |
Prepare;
|
359 |
Value.Assign(FParams);
|
360 |
finally
|
361 |
UnPrepare;
|
362 |
end else
|
363 |
Value.Assign(FParams);
|
364 |
end;
|
365 |
|
366 |
procedure TIBStoredProc.SetParamsList(Value: TParams);
|
367 |
begin
|
368 |
CheckInactive;
|
369 |
if Prepared then
|
370 |
begin
|
371 |
SetPrepared(False);
|
372 |
FParams.Assign(Value);
|
373 |
SetPrepared(True);
|
374 |
end else
|
375 |
FParams.Assign(Value);
|
376 |
end;
|
377 |
|
378 |
function TIBStoredProc.ParamByName(const Value: string): TParam;
|
379 |
begin
|
380 |
Result := FParams.ParamByName(Value);
|
381 |
end;
|
382 |
|
383 |
function TIBStoredProc.GetStoredProcedureNames: TStrings;
|
384 |
begin
|
385 |
FNameList.clear;
|
386 |
GetStoredProcedureNamesFromServer;
|
387 |
Result := FNameList;
|
388 |
end;
|
389 |
|
390 |
procedure TIBStoredProc.GetStoredProcedureNamesFromServer;
|
391 |
var
|
392 |
Query : TIBSQL;
|
393 |
begin
|
394 |
if not (csReading in ComponentState) then begin
|
395 |
ActivateConnection;
|
396 |
Database.InternalTransaction.StartTransaction;
|
397 |
Query := TIBSQL.Create(self);
|
398 |
try
|
399 |
Query.GoToFirstRecordOnExecute := False;
|
400 |
Query.Database := DataBase;
|
401 |
Query.Transaction := Database.InternalTransaction;
|
402 |
Query.SQL.Text := 'Select RDB$PROCEDURE_NAME from RDB$PROCEDURES'; {do not localize}
|
403 |
Query.Prepare;
|
404 |
Query.ExecQuery;
|
405 |
while (not Query.EOF) and (Query.Next <> nil) do
|
406 |
FNameList.Add(TrimRight(Query.Current.ByName('RDB$PROCEDURE_NAME').AsString)); {do not localize}
|
407 |
finally
|
408 |
Query.Free;
|
409 |
Database.InternalTransaction.Commit;
|
410 |
end;
|
411 |
end;
|
412 |
end;
|
413 |
|
414 |
procedure TIBStoredProc.SetParams;
|
415 |
var
|
416 |
i : integer;
|
417 |
j: integer;
|
418 |
begin
|
419 |
i := 0;
|
420 |
for j := 0 to FParams.Count - 1 do
|
421 |
begin
|
422 |
if (Params[j].ParamType <> ptInput) then
|
423 |
continue;
|
424 |
if not Params[j].Bound then
|
425 |
IBError(ibxeRequiredParamNotSet, [nil]);
|
426 |
if Params[j].IsNull then
|
427 |
SQLParams[i].IsNull := True
|
428 |
else begin
|
429 |
SQLParams[i].IsNull := False;
|
430 |
case Params[j].DataType of
|
431 |
ftString:
|
432 |
SQLParams[i].AsString := Params[j].AsString;
|
433 |
ftBoolean, ftSmallint, ftWord:
|
434 |
SQLParams[i].AsShort := Params[j].AsSmallInt;
|
435 |
ftInteger:
|
436 |
SQLParams[i].AsLong := Params[j].AsInteger;
|
437 |
{ ftLargeInt:
|
438 |
SQLParams[i].AsInt64 := Params[j].AsLargeInt; }
|
439 |
ftFloat, ftCurrency:
|
440 |
SQLParams[i].AsDouble := Params[j].AsFloat;
|
441 |
ftBCD:
|
442 |
SQLParams[i].AsCurrency := Params[j].AsCurrency;
|
443 |
ftDate:
|
444 |
SQLParams[i].AsDate := Params[j].AsDateTime;
|
445 |
ftTime:
|
446 |
SQLParams[i].AsTime := Params[j].AsDateTime;
|
447 |
ftDateTime:
|
448 |
SQLParams[i].AsDateTime := Params[j].AsDateTime;
|
449 |
ftBlob, ftMemo:
|
450 |
SQLParams[i].AsString := Params[j].AsString;
|
451 |
else
|
452 |
IBError(ibxeNotSupported, [nil]);
|
453 |
end;
|
454 |
end;
|
455 |
Inc(i);
|
456 |
end;
|
457 |
end;
|
458 |
|
459 |
procedure TIBStoredProc.SetParamsFromCursor;
|
460 |
var
|
461 |
I: Integer;
|
462 |
DataSet: TDataSet;
|
463 |
begin
|
464 |
if DataSource <> nil then
|
465 |
begin
|
466 |
DataSet := DataSource.DataSet;
|
467 |
if DataSet <> nil then
|
468 |
begin
|
469 |
DataSet.FieldDefs.Update;
|
470 |
for I := 0 to FParams.Count - 1 do
|
471 |
with FParams[I] do
|
472 |
if (not Bound) and
|
473 |
((ParamType = ptInput) or (ParamType = ptInputOutput)) then
|
474 |
AssignField(DataSet.FieldByName(Name));
|
475 |
end;
|
476 |
end;
|
477 |
end;
|
478 |
|
479 |
procedure TIBStoredProc.FetchDataIntoOutputParams;
|
480 |
var
|
481 |
i,j : Integer;
|
482 |
begin
|
483 |
j := 0;
|
484 |
for i := 0 to FParams.Count - 1 do
|
485 |
with Params[I] do
|
486 |
if ParamType = ptOutput then begin
|
487 |
Value := QSelect.Fields[j].Value;
|
488 |
Inc(j);
|
489 |
end;
|
490 |
end;
|
491 |
|
492 |
procedure TIBStoredProc.InternalOpen;
|
493 |
begin
|
494 |
IBError(ibxeIsAExecuteProcedure,[nil]);
|
495 |
end;
|
496 |
|
497 |
procedure TIBStoredProc.DefineProperties(Filer: TFiler);
|
498 |
|
499 |
function WriteData: Boolean;
|
500 |
begin
|
501 |
if Filer.Ancestor <> nil then
|
502 |
Result := not FParams.IsEqual(TIBStoredProc(Filer.Ancestor).FParams) else
|
503 |
Result := FParams.Count > 0;
|
504 |
end;
|
505 |
|
506 |
begin
|
507 |
inherited DefineProperties(Filer);
|
508 |
Filer.DefineProperty('ParamData', ReadParamData, WriteParamData, WriteData); {do not localize}
|
509 |
end;
|
510 |
|
511 |
procedure TIBStoredProc.WriteParamData(Writer: TWriter);
|
512 |
begin
|
513 |
Writer.WriteCollection(Params);
|
514 |
end;
|
515 |
|
516 |
procedure TIBStoredProc.ReadParamData(Reader: TReader);
|
517 |
begin
|
518 |
Reader.ReadValue;
|
519 |
Reader.ReadCollection(Params);
|
520 |
end;
|
521 |
|
522 |
{ TIBStoredProc IProviderSupport }
|
523 |
|
524 |
function TIBStoredProc.PSGetParams: TParams;
|
525 |
begin
|
526 |
Result := Params;
|
527 |
end;
|
528 |
|
529 |
procedure TIBStoredProc.PSSetParams(AParams: TParams);
|
530 |
begin
|
531 |
if AParams.Count > 0 then
|
532 |
Params.Assign(AParams);
|
533 |
Close;
|
534 |
end;
|
535 |
|
536 |
function TIBStoredProc.PSGetTableName: string;
|
537 |
begin
|
538 |
{ ! }
|
539 |
end;
|
540 |
|
541 |
procedure TIBStoredProc.PSExecute;
|
542 |
begin
|
543 |
ExecProc;
|
544 |
end;
|
545 |
|
546 |
procedure TIBStoredProc.PSSetCommandText(const CommandText: string);
|
547 |
begin
|
548 |
if CommandText <> '' then
|
549 |
StoredProcName := CommandText;
|
550 |
end;
|
551 |
|
552 |
end.
|