ABAP Select data from SAP table RNF58STRUCT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNF58STRUCT 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 RNF58STRUCT. 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 RNF58STRUCT 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_RNF58STRUCT TYPE STANDARD TABLE OF RNF58STRUCT,
      WA_RNF58STRUCT TYPE RNF58STRUCT,
      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: <RNF58STRUCT> TYPE RNF58STRUCT.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNF58STRUCT.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNF58STRUCT
  INTO TABLE IT_RNF58STRUCT.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNF58STRUCT
*  INTO TABLE @DATA(IT_RNF58STRUCT2).
*--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_RNF58STRUCT INDEX 1 INTO DATA(WA_RNF58STRUCT2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNF58STRUCT ASSIGNING <RNF58STRUCT>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNF58STRUCT>-LNRLM = 1.
<RNF58STRUCT>-MATNR = 1.
<RNF58STRUCT>-MAKTX = 1.
<RNF58STRUCT>-MBLNR = 1.
<RNF58STRUCT>-MBPOS = 1.

ENDLOOP.

LOOP AT IT_RNF58STRUCT INTO WA_RNF58STRUCT.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNF58STRUCT-MBART, sy-vline,
  WA_RNF58STRUCT-WERKS, sy-vline,
  WA_RNF58STRUCT-MENGE, sy-vline,
  WA_RNF58STRUCT-MEINS, sy-vline,
  WA_RNF58STRUCT-LMENG, sy-vline,
  WA_RNF58STRUCT-LMEIN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNF58STRUCT 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_RNF58STRUCT 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_RNF58STRUCT INTO WA_RNF58STRUCT.


*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 LNRLM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF58STRUCT-LNRLM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF58STRUCT-LNRLM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RNF58STRUCT-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF58STRUCT-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field MBLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF58STRUCT-MBLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF58STRUCT-MBLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RNF58STRUCT-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF58STRUCT-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field LMEIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RNF58STRUCT-LMEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF58STRUCT-LMEIN.
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_RNF58STRUCT_STR, 
LNRLM TYPE STRING,
MATNR TYPE STRING,
MAKTX TYPE STRING,
MBLNR TYPE STRING,
MBPOS TYPE STRING,
MBART TYPE STRING,
WERKS TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
LMENG TYPE STRING,
LMEIN TYPE STRING,
LFSTA TYPE STRING,
LFDAT TYPE STRING,
GESTA TYPE STRING,
GENAM TYPE STRING,
GEDAT TYPE STRING,
ERDAT TYPE STRING,
ERUSR TYPE STRING,
MMBSK TYPE STRING,
DRUKZ TYPE STRING,
POSTX TYPE STRING,
PREIS TYPE STRING,
GEPRS TYPE STRING,
WAERS TYPE STRING,
ZHEADER1 TYPE STRING,
ZHEADER2 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNF58STRUCT_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_RNF58STRUCT_STR-LNRLM sy-vline 
WA_RNF58STRUCT_STR-MATNR sy-vline 
WA_RNF58STRUCT_STR-MAKTX sy-vline 
WA_RNF58STRUCT_STR-MBLNR sy-vline 
WA_RNF58STRUCT_STR-MBPOS sy-vline 
WA_RNF58STRUCT_STR-MBART sy-vline 
WA_RNF58STRUCT_STR-WERKS sy-vline 
WA_RNF58STRUCT_STR-MENGE sy-vline 
WA_RNF58STRUCT_STR-MEINS sy-vline 
WA_RNF58STRUCT_STR-LMENG sy-vline 
WA_RNF58STRUCT_STR-LMEIN sy-vline 
WA_RNF58STRUCT_STR-LFSTA sy-vline 
WA_RNF58STRUCT_STR-LFDAT sy-vline 
WA_RNF58STRUCT_STR-GESTA sy-vline 
WA_RNF58STRUCT_STR-GENAM sy-vline 
WA_RNF58STRUCT_STR-GEDAT sy-vline 
WA_RNF58STRUCT_STR-ERDAT sy-vline 
WA_RNF58STRUCT_STR-ERUSR sy-vline 
WA_RNF58STRUCT_STR-MMBSK sy-vline 
WA_RNF58STRUCT_STR-DRUKZ sy-vline 
WA_RNF58STRUCT_STR-POSTX sy-vline 
WA_RNF58STRUCT_STR-PREIS sy-vline 
WA_RNF58STRUCT_STR-GEPRS sy-vline 
WA_RNF58STRUCT_STR-WAERS sy-vline 
WA_RNF58STRUCT_STR-ZHEADER1 sy-vline 
WA_RNF58STRUCT_STR-ZHEADER2 sy-vline      INTO ld_text SEPARATED BY SPACE.

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