OO模式的ABAP REPORT模板-优快云博客

本文介绍如何使用ABAP本地类替代传统报表的FORM结构，包括创建本地类、定义方法和事件，以及处理数据获取、加工和输出的过程。

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首先我们创建本地类lcl_main,并用本地类的公共方法来代替以前ABAP报表的FORM，模式中创建了传统ABAP报表的

三个方法：get_data,process_data,write_data,然后在私有部分创建我们以前的全局变量，常量，并为该类创建

事件以处理无法找到数据等情形，然后定义处理该事件的类，然后就可以在主程序中通过定义对象实现这些类了。

*---------------------------------------------------------------------*
* C.L.A.S.S  lcl_main  D.E.F.I.N.I.T.I.O.N
*---------------------------------------------------------------------*
CLASS lcl_main DEFINITION.
  PUBLIC SECTION.
    METHODS: get_data,
             process_data,
             write_data.
    EVENTS: no_data.

  PRIVATE SECTION.
*----------------------------------
* C.O.N.S.T.A.N.T.S
*----------------------------------
    constants : tno(4)     value 'No',
                tpernr(8)  value 'Pers.No',
                tcname(23) value 'Name',
                ttrfst(5)  value 'Level',
                tbtrtl(6)  value 'Dept',
                tbegda(10) value 'Date',
                tbeguz(7)  value 'Time',
                tawart(4)  value 'Type',
                tatext(23) value 'Description'.

*---------------------------------
* L.O.C.A.L  D.A.T.A.
*---------------------------------
    DATA: nomer type i,
          begin of WA_RESULT,
            pernr type pa0001-pernr,
            cname type pa0002-cname,
            trfst type pa0008-trfst,
            btrtl type pa0001-btrtl,
            begda type pa2001-begda,
            beguz type pa2001-beguz,
            awart type pa2001-awart,
            atext type t554t-atext,
            BEGEN(10),
          end of WA_RESULT,
          begin of wa_pa0001,
             pernr type pa0001-pernr,
             werks type pa0001-werks,
             btrtl type pa0001-btrtl,
             trfst type pa0008-trfst,
          end of wa_pa0001,
          begin of wa_pa0002 ,
             pernr type pa0002-pernr,
             cname type pa0002-cname,
          end of wa_pa0002,
          begin of wa_pa2001 ,
             pernr type pa2001-pernr,
             begda type pa2001-begda,
             endda type pa2001-endda,
             awart type pa2001-awart,
             beguz type P2001-BEGUZ,
             enduz type P2001-ENDUZ,
          end of wa_pa2001,
          wa_t554t   type t554t,
          IT_RESULT  like standard table of WA_RESULT,
          IT_pa0001  like standard table of WA_pa0001,
          IT_pa0002  like standard table of WA_pa0002,
          IT_pa2001  like standard table of WA_pa2001,
          IT_t554t   like standard table of WA_t554t.

ENDCLASS.

*---------------------------------------------------------------------*
* C.L.A.S.S lcl_handler D.E.F.I.N.I.T.I.O.N
*---------------------------------------------------------------------*
CLASS lcl_handler DEFINITION.
PUBLIC SECTION.
METHODS handle_event FOR EVENT no_data OF lcl_main.
ENDCLASS.

*---------------------------------------------------------------------*
* C.L.A.S.S  lcl_main  I.M.P.L.E.M.E.N.T.A.T.I.O.N
*---------------------------------------------------------------------*
CLASS lcl_main IMPLEMENTATION.

*----------------------------------------------*
* METHOD get_data                              *
*----------------------------------------------*
  METHOD get_data.
  ENDMETHOD.

*----------------------------------------------*
* METHOD process_data                          *
*----------------------------------------------*
  METHOD process_data.
  ENDMETHOD.

*----------------------------------------------*
* METHOD write_data                            *
*----------------------------------------------*
  METHOD write_data.
  ENDMETHOD.
ENDCLASS.

*---------------------------------------------------------------------*
* C.L.A.S.S  lcl_handler  I.M.P.L.E.M.E.N.T.A.T.I.O.N
*---------------------------------------------------------------------*
CLASS lcl_handler IMPLEMENTATION.

*----------------------------------------------*
* METHOD handle_event                         *
*----------------------------------------------*
  METHOD handle_event.
  ENDMETHOD.
ENDCLASS.

*----------------------------------------------------------------------*
* M.A.I.N.  .P.R.O.G.R.A.M.
*----------------------------------------------------------------------*
START-OF-SELECTION.
  DATA: o_main           TYPE REF TO lcl_main,
        o_handler        TYPE REF TO lcl_handler.

  CREATE OBJECT: o_main, o_handler.

  SET HANDLER o_handler->handle_event FOR ALL INSTANCES.
  CALL METHOD o_main->get_data.
  CALL METHOD o_main->process_data.
  CALL METHOD o_main->write_data.