ABAP Select data from SAP table RIWOL into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RIWOL 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 RIWOL. 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 RIWOL 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_RIWOL TYPE STANDARD TABLE OF RIWOL,
      WA_RIWOL TYPE RIWOL,
      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: <RIWOL> TYPE RIWOL.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RIWOL
*  INTO TABLE @DATA(IT_RIWOL2).
*--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_RIWOL INDEX 1 INTO DATA(WA_RIWOL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RIWOL>-OBJNR = 1.
<RIWOL>-MANDT = 1.
<RIWOL>-OBKNR = 1.
<RIWOL>-OBZAE = 1.
<RIWOL>-EQUNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RIWOL-IHNUM, sy-vline,
  WA_RIWOL-BAUTL, sy-vline,
  WA_RIWOL-ILOAN, sy-vline,
  WA_RIWOL-SORTF, sy-vline,
  WA_RIWOL-BEARB, sy-vline,
  WA_RIWOL-OBJVW, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RIWOL 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_RIWOL 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_RIWOL INTO WA_RIWOL.


*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 EQUNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RIWOL-EQUNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RIWOL-EQUNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit MATN1, internal->external for field BAUTL
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RIWOL-BAUTL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RIWOL-BAUTL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GERNR, internal->external for field SERNR
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_RIWOL-SERNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RIWOL-SERNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RIWOL-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RIWOL-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field PRODUCT
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RIWOL-PRODUCT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RIWOL-PRODUCT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TPLNR, internal->external for field TPLNR
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_RIWOL-TPLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RIWOL-TPLNR.
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_RIWOL_STR, 
OBJNR TYPE STRING,
MANDT TYPE STRING,
OBKNR TYPE STRING,
OBZAE TYPE STRING,
EQUNR TYPE STRING,
IHNUM TYPE STRING,
BAUTL TYPE STRING,
ILOAN TYPE STRING,
SORTF TYPE STRING,
BEARB TYPE STRING,
OBJVW TYPE STRING,
SERNR TYPE STRING,
MATNR TYPE STRING,
DATUM TYPE STRING,
EQSNR TYPE STRING,
TASER TYPE STRING,
UII TYPE STRING,
EAM_BADI_FLAG TYPE STRING,
EAM_OBJ_ORIG TYPE STRING,
PRODUCT TYPE STRING,
MATKTX TYPE STRING,
EQTXT TYPE STRING,
TPLNR TYPE STRING,
PLTXT TYPE STRING,
BAUTX TYPE STRING,
IWERK TYPE STRING,
QMTXT TYPE STRING,
QMART TYPE STRING,
QMKNZ TYPE STRING,
DBKNZ TYPE STRING,
O_OBJNR TYPE STRING,
NODELFLG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RIWOL_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_RIWOL_STR-OBJNR sy-vline 
WA_RIWOL_STR-MANDT sy-vline 
WA_RIWOL_STR-OBKNR sy-vline 
WA_RIWOL_STR-OBZAE sy-vline 
WA_RIWOL_STR-EQUNR sy-vline 
WA_RIWOL_STR-IHNUM sy-vline 
WA_RIWOL_STR-BAUTL sy-vline 
WA_RIWOL_STR-ILOAN sy-vline 
WA_RIWOL_STR-SORTF sy-vline 
WA_RIWOL_STR-BEARB sy-vline 
WA_RIWOL_STR-OBJVW sy-vline 
WA_RIWOL_STR-SERNR sy-vline 
WA_RIWOL_STR-MATNR sy-vline 
WA_RIWOL_STR-DATUM sy-vline 
WA_RIWOL_STR-EQSNR sy-vline 
WA_RIWOL_STR-TASER sy-vline 
WA_RIWOL_STR-UII sy-vline 
WA_RIWOL_STR-EAM_BADI_FLAG sy-vline 
WA_RIWOL_STR-EAM_OBJ_ORIG sy-vline 
WA_RIWOL_STR-PRODUCT sy-vline 
WA_RIWOL_STR-MATKTX sy-vline 
WA_RIWOL_STR-EQTXT sy-vline 
WA_RIWOL_STR-TPLNR sy-vline 
WA_RIWOL_STR-PLTXT sy-vline 
WA_RIWOL_STR-BAUTX sy-vline 
WA_RIWOL_STR-IWERK sy-vline 
WA_RIWOL_STR-QMTXT sy-vline 
WA_RIWOL_STR-QMART sy-vline 
WA_RIWOL_STR-QMKNZ sy-vline 
WA_RIWOL_STR-DBKNZ sy-vline 
WA_RIWOL_STR-O_OBJNR sy-vline 
WA_RIWOL_STR-NODELFLG sy-vline      INTO ld_text SEPARATED BY SPACE.

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