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(*
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* Firebird UDR Support (fbudrtested). The fbudr components provide a set of
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* Pascal language bindings for the Firebird API in support of server
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* side User Defined Routines (UDRs). The fbudr package is an extension
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* to the Firebird Pascal API.
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*
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* The contents of this file are subject to the Initial Developer's
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* Public License Version 1.0 (the "License"); you may not use this
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* file except in compliance with the License. You may obtain a copy
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* of the License here:
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*
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* http://www.firebirdsql.org/index.php?op=doc&id=idpl
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing rights
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* and limitations under the License.
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*
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* The Initial Developer of the Original Code is Tony Whyman.
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*
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* The Original Code is (C) 2021 Tony Whyman, MWA Software
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* (http://www.mwasoftware.co.uk).
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*
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* All Rights Reserved.
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*
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* Contributor(s): ______________________________________.
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*
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*)
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unit udr_test02;
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{$IFDEF MSWINDOWS}
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{$DEFINE WINDOWS}
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{$ENDIF}
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{$IFDEF FPC}
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{$mode delphi}
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{$codepage UTF8}
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{$interfaces COM}
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{$ENDIF}
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interface
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uses
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Classes, SysUtils, IB, FBUDRController, FBUDRIntf;
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{This unit provides the implementation of selected number of UDR Execute
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procedures used to test out various aspects of the TFBUDRExecuteProcedure class.
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Note that each class is registered with the FBUDRController at initialization time.}
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type
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{TMyTestProcedure is a simple Execute procedure to demonstrate use of the
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UDR library. The Employee database is assumed. The input parameter selects a
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row in the EMPLOYEE table and the procedure returns the salary and full name
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of the selected employee.
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create or alter procedure MyTestProc (
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EMP_NO SMALLINT
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) returns (Salary Numeric(10,2), FullName VarChar(36))
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external name 'fbudrtests!test_proc'
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engine udr;
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}
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TMyTestProcedure = class(TFBUDRExecuteProcedure)
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public
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procedure Execute(context: IFBUDRExternalContext;
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ProcMetadata: IFBUDRProcMetadata;
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InputParams: IFBUDRInputParams;
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OutputData: IFBUDROutputData); override;
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end;
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{TMyErrorProc is intended to test out error handling for various error conditions}
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{
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Create or Alter procedure MyErrorProc (
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ErrorCase Smallint)
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external name 'fbudrtests!error_proc'
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engine udr;
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}
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TMyErrorProc = class(TFBUDRExecuteProcedure)
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public
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procedure Execute(context: IFBUDRExternalContext;
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ProcMetadata: IFBUDRProcMetadata;
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InputParams: IFBUDRInputParams;
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OutputData: IFBUDROutputData); override;
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end;
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implementation
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{ TMyErrorProc }
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procedure TMyErrorProc.Execute(context: IFBUDRExternalContext;
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ProcMetadata: IFBUDRProcMetadata; InputParams: IFBUDRInputParams;
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OutputData: IFBUDROutputData);
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var aResult: integer;
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begin
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with context do
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case InputParams.ByName('ErrorCase').AsInteger of
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0:
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{DDL error - duplicate table name}
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begin
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GetAttachment.ExecImmediate([isc_tpb_write, isc_tpb_nowait, isc_tpb_read_committed],
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'Create Global Temporary Table TestMe(EMP_NO Integer)');
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GetAttachment.ExecImmediate([isc_tpb_write, isc_tpb_nowait, isc_tpb_read_committed],
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'Create Global Temporary Table TestMe(EMP_NO Integer)');
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end;
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1:
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{General Exception handling}
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raise Exception.Create('You have a bug');
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2:
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{arithmetic exception - divide by zero}
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begin
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aResult := 0;
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aResult := Round(100/aResult);
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end;
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end;
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end;
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{ TMyTestProcedure }
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procedure TMyTestProcedure.Execute(context: IFBUDRExternalContext;
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ProcMetadata: IFBUDRProcMetadata; InputParams: IFBUDRInputParams;
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OutputData: IFBUDROutputData);
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var Results: IResultSet;
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begin
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with context do
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begin
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Results := GetAttachment.OpenCursorAtStart(GetTransaction,
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'Select Salary, Full_Name From EMPLOYEE Where EMP_NO = ?',
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[InputParams.ByName('EMP_NO').AsInteger]);
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OutputData.ByName('SALARY').AsCurrency := Results.ByName('Salary').AsCurrency;
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OutputData.ByName('FULLNAME').AsString := Results.ByName('Full_Name').AsString;
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end;
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end;
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Initialization
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FBRegisterUDRProcedure('test_proc',TMyTestProcedure);
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FBRegisterUDRProcedure('error_proc',TMyErrorProc);
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end.
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