ABAP Select data from SAP table REWBAUFW02 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP REWBAUFW02 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 REWBAUFW02. 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 REWBAUFW02 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_REWBAUFW02 TYPE STANDARD TABLE OF REWBAUFW02,
      WA_REWBAUFW02 TYPE REWBAUFW02,
      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: <REWBAUFW02> TYPE REWBAUFW02.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_REWBAUFW02.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM REWBAUFW02
  INTO TABLE IT_REWBAUFW02.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REWBAUFW02
*  INTO TABLE @DATA(IT_REWBAUFW022).
*--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_REWBAUFW02 INDEX 1 INTO DATA(WA_REWBAUFW022).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_REWBAUFW02 ASSIGNING <REWBAUFW02>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REWBAUFW02>-ZUDAT = 1.
<REWBAUFW02>-FIART = 1.
<REWBAUFW02>-RGUEBIS = 1.
<REWBAUFW02>-FIKZ = 1.
<REWBAUFW02>-XFIART = 1.

ENDLOOP.

LOOP AT IT_REWBAUFW02 INTO WA_REWBAUFW02.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REWBAUFW02-LFD_NR, sy-vline,
  WA_REWBAUFW02-DGEBER, sy-vline,
  WA_REWBAUFW02-BETRAG, sy-vline,
  WA_REWBAUFW02-TILGUNG, sy-vline,
  WA_REWBAUFW02-ZINS, sy-vline,
  WA_REWBAUFW02-JBETRAG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REWBAUFW02 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_REWBAUFW02 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_REWBAUFW02 INTO WA_REWBAUFW02.


*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 FIART
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REWBAUFW02-FIART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REWBAUFW02-FIART.
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_REWBAUFW02_STR, 
ZUDAT TYPE STRING,
FIART TYPE STRING,
RGUEBIS TYPE STRING,
FIKZ TYPE STRING,
XFIART TYPE STRING,
LFD_NR TYPE STRING,
DGEBER TYPE STRING,
BETRAG TYPE STRING,
TILGUNG TYPE STRING,
ZINS TYPE STRING,
JBETRAG TYPE STRING,
RMBETRAG TYPE STRING,
MBETRAG_PRO_EINH TYPE STRING,
AUFWSTAT TYPE STRING,
ENDEKZ TYPE STRING,
MAW TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REWBAUFW02_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_REWBAUFW02_STR-ZUDAT sy-vline 
WA_REWBAUFW02_STR-FIART sy-vline 
WA_REWBAUFW02_STR-RGUEBIS sy-vline 
WA_REWBAUFW02_STR-FIKZ sy-vline 
WA_REWBAUFW02_STR-XFIART sy-vline 
WA_REWBAUFW02_STR-LFD_NR sy-vline 
WA_REWBAUFW02_STR-DGEBER sy-vline 
WA_REWBAUFW02_STR-BETRAG sy-vline 
WA_REWBAUFW02_STR-TILGUNG sy-vline 
WA_REWBAUFW02_STR-ZINS sy-vline 
WA_REWBAUFW02_STR-JBETRAG sy-vline 
WA_REWBAUFW02_STR-RMBETRAG sy-vline 
WA_REWBAUFW02_STR-MBETRAG_PRO_EINH sy-vline 
WA_REWBAUFW02_STR-AUFWSTAT sy-vline 
WA_REWBAUFW02_STR-ENDEKZ sy-vline 
WA_REWBAUFW02_STR-MAW sy-vline      INTO ld_text SEPARATED BY SPACE.

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