ABAP Select data from SAP table RE20A into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

Below is a number of ABAP code snippets to demonstrate how to select data from SAP RE20A 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 RE20A. 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 RE20A 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_RE20A TYPE STANDARD TABLE OF RE20A,
      WA_RE20A TYPE RE20A,
      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: <RE20A> TYPE RE20A.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RE20A.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RE20A
  INTO TABLE IT_RE20A.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RE20A
*  INTO TABLE @DATA(IT_RE20A2).
*--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_RE20A INDEX 1 INTO DATA(WA_RE20A2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RE20A ASSIGNING <RE20A>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RE20A>-MANDT = 1.
<RE20A>-TARIFTYP = 1.
<RE20A>-SPARTE = 1.
<RE20A>-SPARTTEXT = 1.
<RE20A>-TTYPBEZ = 1.

ENDLOOP.

LOOP AT IT_RE20A INTO WA_RE20A.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RE20A-AKLASSE, sy-vline,
  WA_RE20A-GASABART, sy-vline,
  WA_RE20A-GASABARTBEZ, sy-vline,
  WA_RE20A-ERDAT, sy-vline,
  WA_RE20A-ERNAM, sy-vline,
  WA_RE20A-AEDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RE20A 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_RE20A 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_RE20A INTO WA_RE20A.


*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 DYPERCON
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RE20A-DYPERCON
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RE20A-DYPERCON.
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_RE20A_STR, 
MANDT TYPE STRING,
TARIFTYP TYPE STRING,
SPARTE TYPE STRING,
SPARTTEXT TYPE STRING,
TTYPBEZ TYPE STRING,
AKLASSE TYPE STRING,
GASABART TYPE STRING,
GASABARTBEZ TYPE STRING,
ERDAT TYPE STRING,
ERNAM TYPE STRING,
AEDAT TYPE STRING,
AENAM TYPE STRING,
BEGRU TYPE STRING,
LOEVM TYPE STRING,
V_TARIFTYP TYPE STRING,
V_SPARTE TYPE STRING,
AKLASSTEXT TYPE STRING,
MWSTMBEZ TYPE STRING,
STICHTAG TYPE STRING,
NOBACKBI TYPE STRING,
FLBACKBI TYPE STRING,
PERBACKBI TYPE STRING,
NUMPERPEB TYPE STRING,
NUMPERBB TYPE STRING,
NOPENDBI TYPE STRING,
PEBSEPAR TYPE STRING,
DIFPBPEB TYPE STRING,
PEBINCPB TYPE STRING,
AUSGRUP TYPE STRING,
AUSGRUPBEZ TYPE STRING,
ENDPRIO TYPE STRING,
STAGRUTTYP TYPE STRING,
STAGRUTTYPBEZ TYPE STRING,
BIADVANCE TYPE STRING,
DYPERCON TYPE STRING,
CONDBILLPROG TYPE STRING,
VISIBILITY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RE20A_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_RE20A_STR-MANDT sy-vline 
WA_RE20A_STR-TARIFTYP sy-vline 
WA_RE20A_STR-SPARTE sy-vline 
WA_RE20A_STR-SPARTTEXT sy-vline 
WA_RE20A_STR-TTYPBEZ sy-vline 
WA_RE20A_STR-AKLASSE sy-vline 
WA_RE20A_STR-GASABART sy-vline 
WA_RE20A_STR-GASABARTBEZ sy-vline 
WA_RE20A_STR-ERDAT sy-vline 
WA_RE20A_STR-ERNAM sy-vline 
WA_RE20A_STR-AEDAT sy-vline 
WA_RE20A_STR-AENAM sy-vline 
WA_RE20A_STR-BEGRU sy-vline 
WA_RE20A_STR-LOEVM sy-vline 
WA_RE20A_STR-V_TARIFTYP sy-vline 
WA_RE20A_STR-V_SPARTE sy-vline 
WA_RE20A_STR-AKLASSTEXT sy-vline 
WA_RE20A_STR-MWSTMBEZ sy-vline 
WA_RE20A_STR-STICHTAG sy-vline 
WA_RE20A_STR-NOBACKBI sy-vline 
WA_RE20A_STR-FLBACKBI sy-vline 
WA_RE20A_STR-PERBACKBI sy-vline 
WA_RE20A_STR-NUMPERPEB sy-vline 
WA_RE20A_STR-NUMPERBB sy-vline 
WA_RE20A_STR-NOPENDBI sy-vline 
WA_RE20A_STR-PEBSEPAR sy-vline 
WA_RE20A_STR-DIFPBPEB sy-vline 
WA_RE20A_STR-PEBINCPB sy-vline 
WA_RE20A_STR-AUSGRUP sy-vline 
WA_RE20A_STR-AUSGRUPBEZ sy-vline 
WA_RE20A_STR-ENDPRIO sy-vline 
WA_RE20A_STR-STAGRUTTYP sy-vline 
WA_RE20A_STR-STAGRUTTYPBEZ sy-vline 
WA_RE20A_STR-BIADVANCE sy-vline 
WA_RE20A_STR-DYPERCON sy-vline 
WA_RE20A_STR-CONDBILLPROG sy-vline 
WA_RE20A_STR-VISIBILITY sy-vline      INTO ld_text SEPARATED BY SPACE.

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