ABAP Select data from SAP table RNPERX 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 RNPERX 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 RNPERX. 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 RNPERX 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_RNPERX TYPE STANDARD TABLE OF RNPERX,
      WA_RNPERX TYPE RNPERX,
      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: <RNPERX> TYPE RNPERX.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNPERX
*  INTO TABLE @DATA(IT_RNPERX2).
*--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_RNPERX INDEX 1 INTO DATA(WA_RNPERX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNPERX>-PERNR = 1.
<RNPERX>-GBDAT = 1.
<RNPERX>-GBDAT_X = 1.
<RNPERX>-RUFAN = 1.
<RNPERX>-RUFAN_X = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNPERX-MAKZ, sy-vline,
  WA_RNPERX-MAKZ_X, sy-vline,
  WA_RNPERX-RPPKZ, sy-vline,
  WA_RNPERX-RPPKZ_X, sy-vline,
  WA_RNPERX-EXPNR, sy-vline,
  WA_RNPERX-EXPNR_X, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNPERX 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_RNPERX 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_RNPERX INTO WA_RNPERX.


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

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

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

*Conversion exit ALPHA, internal->external for field RANK
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNPERX-RANK
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNPERX-RANK.
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_RNPERX_STR, 
PERNR TYPE STRING,
GBDAT TYPE STRING,
GBDAT_X TYPE STRING,
RUFAN TYPE STRING,
RUFAN_X TYPE STRING,
MAKZ TYPE STRING,
MAKZ_X TYPE STRING,
RPPKZ TYPE STRING,
RPPKZ_X TYPE STRING,
EXPNR TYPE STRING,
EXPNR_X TYPE STRING,
ARZT TYPE STRING,
ARZT_X TYPE STRING,
ARZTN TYPE STRING,
ARZTN_X TYPE STRING,
PFLEG TYPE STRING,
PFLEG_X TYPE STRING,
BARZT TYPE STRING,
BARZT_X TYPE STRING,
KVZUL TYPE STRING,
KVZUL_X TYPE STRING,
LIQBE TYPE STRING,
LIQBE_X TYPE STRING,
BEM_X TYPE STRING,
LOEKZ TYPE STRING,
LOEKZ_X TYPE STRING,
FACHR_X TYPE STRING,
USER_X TYPE STRING,
SPTYP TYPE STRING,
SPTYP_X TYPE STRING,
RANK TYPE STRING,
RANK_X TYPE STRING,
RKDAT TYPE STRING,
RKDAT_X TYPE STRING,
QLDI_X TYPE STRING,
QTDI_X TYPE STRING,
LANR_X TYPE STRING,
NBSNR_X TYPE STRING,
FIXLANR TYPE STRING,
FIXLANR_X TYPE STRING,
VOLU TYPE STRING,
VOLU_X TYPE STRING,
NASHOSP_X TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNPERX_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_RNPERX_STR-PERNR sy-vline 
WA_RNPERX_STR-GBDAT sy-vline 
WA_RNPERX_STR-GBDAT_X sy-vline 
WA_RNPERX_STR-RUFAN sy-vline 
WA_RNPERX_STR-RUFAN_X sy-vline 
WA_RNPERX_STR-MAKZ sy-vline 
WA_RNPERX_STR-MAKZ_X sy-vline 
WA_RNPERX_STR-RPPKZ sy-vline 
WA_RNPERX_STR-RPPKZ_X sy-vline 
WA_RNPERX_STR-EXPNR sy-vline 
WA_RNPERX_STR-EXPNR_X sy-vline 
WA_RNPERX_STR-ARZT sy-vline 
WA_RNPERX_STR-ARZT_X sy-vline 
WA_RNPERX_STR-ARZTN sy-vline 
WA_RNPERX_STR-ARZTN_X sy-vline 
WA_RNPERX_STR-PFLEG sy-vline 
WA_RNPERX_STR-PFLEG_X sy-vline 
WA_RNPERX_STR-BARZT sy-vline 
WA_RNPERX_STR-BARZT_X sy-vline 
WA_RNPERX_STR-KVZUL sy-vline 
WA_RNPERX_STR-KVZUL_X sy-vline 
WA_RNPERX_STR-LIQBE sy-vline 
WA_RNPERX_STR-LIQBE_X sy-vline 
WA_RNPERX_STR-BEM_X sy-vline 
WA_RNPERX_STR-LOEKZ sy-vline 
WA_RNPERX_STR-LOEKZ_X sy-vline 
WA_RNPERX_STR-FACHR_X sy-vline 
WA_RNPERX_STR-USER_X sy-vline 
WA_RNPERX_STR-SPTYP sy-vline 
WA_RNPERX_STR-SPTYP_X sy-vline 
WA_RNPERX_STR-RANK sy-vline 
WA_RNPERX_STR-RANK_X sy-vline 
WA_RNPERX_STR-RKDAT sy-vline 
WA_RNPERX_STR-RKDAT_X sy-vline 
WA_RNPERX_STR-QLDI_X sy-vline 
WA_RNPERX_STR-QTDI_X sy-vline 
WA_RNPERX_STR-LANR_X sy-vline 
WA_RNPERX_STR-NBSNR_X sy-vline 
WA_RNPERX_STR-FIXLANR sy-vline 
WA_RNPERX_STR-FIXLANR_X sy-vline 
WA_RNPERX_STR-VOLU sy-vline 
WA_RNPERX_STR-VOLU_X sy-vline 
WA_RNPERX_STR-NASHOSP_X sy-vline      INTO ld_text SEPARATED BY SPACE.

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