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program project1;
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{$mode objfpc}{$H+}
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{ CONSOLE MODE EXAMPLE
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This is a simple use of IBX to access the employee database in console mode.
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The program opens the database, runs a query and writes the result to stdout.
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Key points to note:
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1. In console mode, you have to create the Database and Transaction objects
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explicitly and link them to each other.
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2. The Database properties have to be set explicitly. This includes username
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and password. In the example, these are set from literals. You could update
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this to (e.g.) parse the command line arguments from "ParamStr".
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However, this is left as an exercise for the implementor.
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3. It's a good idea to have the application own the IBDatabase. This ensures that
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exceptions are routed through your application object's exception handler.
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}
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uses
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{$IFDEF UNIX}{$IFDEF UseCThreads}
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cthreads,
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{$ENDIF}{$ENDIF}
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ibexpressconsolemode, Classes, SysUtils, CustApp, IBDatabase, IBQuery
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{ you can add units after this };
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const
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sqlExample =
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'with recursive Depts As ( '+
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'Select DEPT_NO, DEPARTMENT, HEAD_DEPT, cast(DEPARTMENT as VarChar(256)) as DEPT_PATH,'+
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'cast(DEPT_NO as VarChar(64)) as DEPT_KEY_PATH '+
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'From DEPARTMENT Where HEAD_DEPT is NULL '+
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'UNION ALL '+
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'Select DEPT_NO, DEPARTMENT, HEAD_DEPT, Depts.DEPT_PATH || '' / '' || DEPARTMENT as DEPT_PATH,'+
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'Depts.DEPT_KEY_PATH || '';'' || DEPT_NO as DEPT_KEY_PATH '+
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'From DEPARTMENT '+
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'JOIN Depts On HEAD_DEPT = Depts.DEPT_NO '+
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')'+
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'Select A.EMP_NO, A.FIRST_NAME, A.LAST_NAME, A.PHONE_EXT, A.HIRE_DATE, A.DEPT_NO, A.JOB_CODE,'+
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'A.JOB_GRADE, A.JOB_COUNTRY, A.SALARY, A.FULL_NAME, D.DEPT_PATH, D.DEPT_KEY_PATH '+
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'From EMPLOYEE A '+
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'JOIN Depts D On D.DEPT_NO = A.DEPT_NO';
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type
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{ TMyApplication }
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TMyApplication = class(TCustomApplication)
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private
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FIBDatabase: TIBDatabase;
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FIBTransaction: TIBTransaction;
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procedure DoQuery;
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protected
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procedure DoRun; override;
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public
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constructor Create(TheOwner: TComponent); override;
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destructor Destroy; override;
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procedure WriteHelp; virtual;
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end;
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{ TMyApplication }
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procedure TMyApplication.DoQuery;
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var i, rowno: integer;
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begin
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with TIBQuery.Create(self) do
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try
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Database := FIBDatabase;
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SQL.Text := sqlExample;
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Active := true;
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rowno := 1;
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while not EOF do
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begin
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writeln('Record No. ',rowno);
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Inc(rowno);
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writeln;
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for i := 0 to FieldCount - 1 do
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begin
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writeln(Fields[i].FieldName + ': ',Fields[i].AsString);
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end;
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writeln;
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next;
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end;
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finally
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Free;
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end;
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end;
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procedure TMyApplication.DoRun;
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var
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ErrorMsg: String;
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begin
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// quick check parameters
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ErrorMsg:=CheckOptions('h','help');
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if ErrorMsg<>'' then begin
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ShowException(Exception.Create(ErrorMsg));
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Terminate;
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Exit;
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end;
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// parse parameters
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if HasOption('h','help') then begin
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WriteHelp;
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Terminate;
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Exit;
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end;
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{ In console Mode the application should own the database
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- ensures centralised exception handling }
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FIBDatabase := TIBDatabase.Create(self);
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FIBTransaction := TIBTransaction.Create(self);
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FIBDatabase.DatabaseName := 'localhost:employee';
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FIBDatabase.Params.Add('user_name=SYSDBA'); {You may have to modify this!}
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FIBDatabase.Params.Add('password=masterkey'); {You may have to modify this!}
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FIBDatabase.Params.Add('lc_ctype=UTF8');
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FIBTransaction.DefaultDatabase := FIBDatabase;
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DoQuery;
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// stop program loop
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Terminate;
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end;
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constructor TMyApplication.Create(TheOwner: TComponent);
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begin
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inherited Create(TheOwner);
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StopOnException:=True;
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end;
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destructor TMyApplication.Destroy;
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begin
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inherited Destroy;
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end;
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procedure TMyApplication.WriteHelp;
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begin
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{ add your help code here }
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writeln('Usage: ',ExeName,' -h');
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end;
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var
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Application: TMyApplication;
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begin
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Application:=TMyApplication.Create(nil);
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Application.Title:='IBX In Console Mode';
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Application.Run;
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{$IFDEF WINDOWS}
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Sleep(1000); {Gives a chance to see the program output}
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{$ENDIF}
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Application.Free;
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end.
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