ABAP Select data from SAP table RNF12 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 RNF12 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 RNF12. 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 RNF12 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_RNF12 TYPE STANDARD TABLE OF RNF12,
      WA_RNF12 TYPE RNF12,
      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: <RNF12> TYPE RNF12.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNF12.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNF12
  INTO TABLE IT_RNF12.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNF12
*  INTO TABLE @DATA(IT_RNF122).
*--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_RNF12 INDEX 1 INTO DATA(WA_RNF122).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNF12 ASSIGNING <RNF12>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNF12>-BELNR = 1.
<RNF12>-KSKOSTR = 1.
<RNF12>-LFDVV = 1.
<RNF12>-ABGDT = 1.
<RNF12>-VERDT = 1.

ENDLOOP.

LOOP AT IT_RNF12 INTO WA_RNF12.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNF12-EBARB, sy-vline,
  WA_RNF12-EBZEI, sy-vline,
  WA_RNF12-REFBE, sy-vline,
  WA_RNF12-KTEXT, sy-vline,
  WA_RNF12-ERUSR, sy-vline,
  WA_RNF12-KTXTP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNF12 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_RNF12 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_RNF12 INTO WA_RNF12.


*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 BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF12-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF12-BELNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KSKOSTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF12-KSKOSTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF12-KSKOSTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field REFBE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF12-REFBE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF12-REFBE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ORGAB
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF12-ORGAB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF12-ORGAB.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field REFTY
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF12-REFTY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF12-REFTY.
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_RNF12_STR, 
BELNR TYPE STRING,
KSKOSTR TYPE STRING,
LFDVV TYPE STRING,
ABGDT TYPE STRING,
VERDT TYPE STRING,
EBARB TYPE STRING,
EBZEI TYPE STRING,
REFBE TYPE STRING,
KTEXT TYPE STRING,
ERUSR TYPE STRING,
KTXTP TYPE STRING,
ORGAB TYPE STRING,
ORGABKB TYPE STRING,
DUNNLOCK TYPE STRING,
DUNNCNT TYPE STRING,
DUNNDATE TYPE STRING,
BEGDT TYPE STRING,
ENDDT TYPE STRING,
REFTY TYPE STRING,
BEARB TYPE STRING,
VRLNG TYPE STRING,
WAERS TYPE STRING,
TELNR TYPE STRING,
FAXNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNF12_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_RNF12_STR-BELNR sy-vline 
WA_RNF12_STR-KSKOSTR sy-vline 
WA_RNF12_STR-LFDVV sy-vline 
WA_RNF12_STR-ABGDT sy-vline 
WA_RNF12_STR-VERDT sy-vline 
WA_RNF12_STR-EBARB sy-vline 
WA_RNF12_STR-EBZEI sy-vline 
WA_RNF12_STR-REFBE sy-vline 
WA_RNF12_STR-KTEXT sy-vline 
WA_RNF12_STR-ERUSR sy-vline 
WA_RNF12_STR-KTXTP sy-vline 
WA_RNF12_STR-ORGAB sy-vline 
WA_RNF12_STR-ORGABKB sy-vline 
WA_RNF12_STR-DUNNLOCK sy-vline 
WA_RNF12_STR-DUNNCNT sy-vline 
WA_RNF12_STR-DUNNDATE sy-vline 
WA_RNF12_STR-BEGDT sy-vline 
WA_RNF12_STR-ENDDT sy-vline 
WA_RNF12_STR-REFTY sy-vline 
WA_RNF12_STR-BEARB sy-vline 
WA_RNF12_STR-VRLNG sy-vline 
WA_RNF12_STR-WAERS sy-vline 
WA_RNF12_STR-TELNR sy-vline 
WA_RNF12_STR-FAXNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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