ABAP Select data from SAP table WPOCP_CHANGE_HEADER into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WPOCP_CHANGE_HEADER table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to WPOCP_CHANGE_HEADER. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the WPOCP_CHANGE_HEADER table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_WPOCP_CHANGE_HEADER TYPE STANDARD TABLE OF WPOCP_CHANGE_HEADER,
      WA_WPOCP_CHANGE_HEADER TYPE WPOCP_CHANGE_HEADER,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <WPOCP_CHANGE_HEADER> TYPE WPOCP_CHANGE_HEADER.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_WPOCP_CHANGE_HEADER.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM WPOCP_CHANGE_HEADER
  INTO TABLE IT_WPOCP_CHANGE_HEADER.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WPOCP_CHANGE_HEADER
*  INTO TABLE @DATA(IT_WPOCP_CHANGE_HEADER2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_WPOCP_CHANGE_HEADER INDEX 1 INTO DATA(WA_WPOCP_CHANGE_HEADER2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_WPOCP_CHANGE_HEADER ASSIGNING <WPOCP_CHANGE_HEADER>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WPOCP_CHANGE_HEADER>-EBELN = 1.
<WPOCP_CHANGE_HEADER>-ERROR_STATUS = 1.
<WPOCP_CHANGE_HEADER>-HISTKZ = 1.
<WPOCP_CHANGE_HEADER>-FRGKZ = 1.
<WPOCP_CHANGE_HEADER>-INCO1 = 1.

ENDLOOP.

LOOP AT IT_WPOCP_CHANGE_HEADER INTO WA_WPOCP_CHANGE_HEADER.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WPOCP_CHANGE_HEADER-INCO1_X, sy-vline,
  WA_WPOCP_CHANGE_HEADER-INCO2, sy-vline,
  WA_WPOCP_CHANGE_HEADER-INCO2_X, sy-vline,
  WA_WPOCP_CHANGE_HEADER-ZTERM, sy-vline,
  WA_WPOCP_CHANGE_HEADER-ZTERM_X, sy-vline,
  WA_WPOCP_CHANGE_HEADER-TEXT_ID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WPOCP_CHANGE_HEADER you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_WPOCP_CHANGE_HEADER TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_WPOCP_CHANGE_HEADER INTO WA_WPOCP_CHANGE_HEADER.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.

*Conversion exit ALPHA, internal->external for field EBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WPOCP_CHANGE_HEADER-EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WPOCP_CHANGE_HEADER-EBELN.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_WPOCP_CHANGE_HEADER_STR, 
EBELN TYPE STRING,
ERROR_STATUS TYPE STRING,
HISTKZ TYPE STRING,
FRGKZ TYPE STRING,
INCO1 TYPE STRING,
INCO1_X TYPE STRING,
INCO2 TYPE STRING,
INCO2_X TYPE STRING,
ZTERM TYPE STRING,
ZTERM_X TYPE STRING,
TEXT_ID TYPE STRING,
TEXT_FORM TYPE STRING,
TEXT TYPE STRING,
TEXT_X TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WPOCP_CHANGE_HEADER_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_WPOCP_CHANGE_HEADER_STR-EBELN sy-vline 
WA_WPOCP_CHANGE_HEADER_STR-ERROR_STATUS sy-vline 
WA_WPOCP_CHANGE_HEADER_STR-HISTKZ sy-vline 
WA_WPOCP_CHANGE_HEADER_STR-FRGKZ sy-vline 
WA_WPOCP_CHANGE_HEADER_STR-INCO1 sy-vline 
WA_WPOCP_CHANGE_HEADER_STR-INCO1_X sy-vline 
WA_WPOCP_CHANGE_HEADER_STR-INCO2 sy-vline 
WA_WPOCP_CHANGE_HEADER_STR-INCO2_X sy-vline 
WA_WPOCP_CHANGE_HEADER_STR-ZTERM sy-vline 
WA_WPOCP_CHANGE_HEADER_STR-ZTERM_X sy-vline 
WA_WPOCP_CHANGE_HEADER_STR-TEXT_ID sy-vline 
WA_WPOCP_CHANGE_HEADER_STR-TEXT_FORM sy-vline 
WA_WPOCP_CHANGE_HEADER_STR-TEXT sy-vline 
WA_WPOCP_CHANGE_HEADER_STR-TEXT_X sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.