| 1 |
tony |
402 |
(* |
| 2 |
|
|
* Firebird UDR Support (fbudrtestbed). The fbudr components provide a set of |
| 3 |
|
|
* Pascal language bindings for the Firebird API in support of server |
| 4 |
|
|
* side User Defined Routines (UDRs). The fbudr package is an extension |
| 5 |
|
|
* to the Firebird Pascal API. |
| 6 |
|
|
* |
| 7 |
|
|
* The contents of this file are subject to the Initial Developer's |
| 8 |
|
|
* Public License Version 1.0 (the "License"); you may not use this |
| 9 |
|
|
* file except in compliance with the License. You may obtain a copy |
| 10 |
|
|
* of the License here: |
| 11 |
|
|
* |
| 12 |
|
|
* http://www.firebirdsql.org/index.php?op=doc&id=idpl |
| 13 |
|
|
* |
| 14 |
|
|
* Software distributed under the License is distributed on an "AS |
| 15 |
|
|
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or |
| 16 |
|
|
* implied. See the License for the specific language governing rights |
| 17 |
|
|
* and limitations under the License. |
| 18 |
|
|
* |
| 19 |
|
|
* The Initial Developer of the Original Code is Tony Whyman. |
| 20 |
|
|
* |
| 21 |
|
|
* The Original Code is (C) 2021 Tony Whyman, MWA Software |
| 22 |
|
|
* (http://www.mwasoftware.co.uk). |
| 23 |
|
|
* |
| 24 |
|
|
* All Rights Reserved. |
| 25 |
|
|
* |
| 26 |
|
|
* Contributor(s): ______________________________________. |
| 27 |
|
|
* |
| 28 |
|
|
*) |
| 29 |
|
|
unit udr_test04; |
| 30 |
|
|
|
| 31 |
|
|
{$IFDEF MSWINDOWS} |
| 32 |
|
|
{$DEFINE WINDOWS} |
| 33 |
|
|
{$ENDIF} |
| 34 |
|
|
|
| 35 |
|
|
{$IFDEF FPC} |
| 36 |
|
|
{$mode delphi} |
| 37 |
|
|
{$codepage UTF8} |
| 38 |
|
|
{$interfaces COM} |
| 39 |
|
|
{$ENDIF} |
| 40 |
|
|
|
| 41 |
|
|
interface |
| 42 |
|
|
|
| 43 |
|
|
uses |
| 44 |
|
|
Classes, SysUtils, IB, FBUDRController, FBUDRIntf; |
| 45 |
|
|
|
| 46 |
|
|
{This unit provides the implementation of a UDR trigger and is used |
| 47 |
|
|
to test out various aspects of the TFBUDRTrigger class. Note that each class is |
| 48 |
|
|
registered with the FBUDRController at initialization time.} |
| 49 |
|
|
|
| 50 |
|
|
type |
| 51 |
|
|
{This test adds an extra column to EMPLOYEE table to work with with an update before trigger. |
| 52 |
|
|
This is OLD_PHONE_EXT. The trigger checks to see if the Phone_Ext has been updated and, if so, the old |
| 53 |
|
|
value is saved in OLD_PHONE_EXT. |
| 54 |
|
|
|
| 55 |
|
|
Alter Table EMPLOYEE Add PREVIOUS_PHONE_EXT VarChar(4); |
| 56 |
|
|
|
| 57 |
|
|
Create or Alter Trigger MyEmployeeUpdate Active Before Update On EMPLOYEE |
| 58 |
|
|
external name 'fbudrtests!my_employee_update' |
| 59 |
|
|
engine udr; |
| 60 |
|
|
} |
| 61 |
|
|
|
| 62 |
|
|
{ TMyEmployeeUpdateTrigger } |
| 63 |
|
|
|
| 64 |
|
|
TMyEmployeeUpdateTrigger = class(TFBUDRTrigger) |
| 65 |
|
|
public |
| 66 |
|
|
procedure BeforeTrigger(context: IFBUDRExternalContext; |
| 67 |
|
|
TriggerMetaData: IFBUDRTriggerMetaData; |
| 68 |
|
|
action: TFBUDRTriggerAction; |
| 69 |
|
|
OldParams: IFBUDRInputParams; |
| 70 |
|
|
NewParams: IFBUDROutputData); override; |
| 71 |
|
|
end; |
| 72 |
|
|
|
| 73 |
|
|
implementation |
| 74 |
|
|
|
| 75 |
|
|
{ TMyEmployeeUpdateTrigger } |
| 76 |
|
|
|
| 77 |
|
|
procedure TMyEmployeeUpdateTrigger.BeforeTrigger( |
| 78 |
|
|
context: IFBUDRExternalContext; TriggerMetaData: IFBUDRTriggerMetaData; |
| 79 |
|
|
action: TFBUDRTriggerAction; OldParams: IFBUDRInputParams; |
| 80 |
|
|
NewParams: IFBUDROutputData); |
| 81 |
|
|
begin |
| 82 |
|
|
if (TriggerMetaData.getTriggerType <> ttBefore) or (action <> taUpdate) then |
| 83 |
|
|
raise Exception.CreateFmt('%s should be an update before trigger',[Name]); |
| 84 |
|
|
|
| 85 |
|
|
if OldParams.ByName('PHONE_EXT').AsString <> NewParams.ByName('PHONE_EXT').AsString then |
| 86 |
|
|
NewParams.ByName('PREVIOUS_PHONE_EXT').AsString := OldParams.ByName('PHONE_EXT').AsString; |
| 87 |
|
|
end; |
| 88 |
|
|
|
| 89 |
|
|
initialization |
| 90 |
|
|
FBRegisterUDRTrigger('my_employee_update', TMyEmployeeUpdateTrigger); |
| 91 |
|
|
|
| 92 |
|
|
end. |
| 93 |
|
|
|
