ABAP Select data from SAP table RPCNTAX into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RPCNTAX
*  INTO TABLE @DATA(IT_RPCNTAX2).
*--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_RPCNTAX INDEX 1 INTO DATA(WA_RPCNTAX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RPCNTAX>-CNAME = 1.
<RPCNTAX>-INNUM = 1.
<RPCNTAX>-TXARE = 1.
<RPCNTAX>-INCTP = 1.
<RPCNTAX>-FPPER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RPCNTAX-TXINC, sy-vline,
  WA_RPCNTAX-SEXPAM, sy-vline,
  WA_RPCNTAX-EXPAM, sy-vline,
  WA_RPCNTAX-TXPCT, sy-vline,
  WA_RPCNTAX-TXACC, sy-vline,
  WA_RPCNTAX-TXAMT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RPCNTAX 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_RPCNTAX 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_RPCNTAX INTO WA_RPCNTAX.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_RPCNTAX_STR, 
CNAME TYPE STRING,
INNUM TYPE STRING,
TXARE TYPE STRING,
INCTP TYPE STRING,
FPPER TYPE STRING,
TXINC TYPE STRING,
SEXPAM TYPE STRING,
EXPAM TYPE STRING,
TXPCT TYPE STRING,
TXACC TYPE STRING,
TXAMT TYPE STRING,
ZXAMT TYPE STRING,
TXIN2 TYPE STRING,
PIAMT TYPE STRING,
UIAMT TYPE STRING,
MIAMT TYPE STRING,
IIAMT TYPE STRING,
BIAMT TYPE STRING,
PHFAM TYPE STRING,
ENTXI TYPE STRING,
PERNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RPCNTAX_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_RPCNTAX_STR-CNAME sy-vline 
WA_RPCNTAX_STR-INNUM sy-vline 
WA_RPCNTAX_STR-TXARE sy-vline 
WA_RPCNTAX_STR-INCTP sy-vline 
WA_RPCNTAX_STR-FPPER sy-vline 
WA_RPCNTAX_STR-TXINC sy-vline 
WA_RPCNTAX_STR-SEXPAM sy-vline 
WA_RPCNTAX_STR-EXPAM sy-vline 
WA_RPCNTAX_STR-TXPCT sy-vline 
WA_RPCNTAX_STR-TXACC sy-vline 
WA_RPCNTAX_STR-TXAMT sy-vline 
WA_RPCNTAX_STR-ZXAMT sy-vline 
WA_RPCNTAX_STR-TXIN2 sy-vline 
WA_RPCNTAX_STR-PIAMT sy-vline 
WA_RPCNTAX_STR-UIAMT sy-vline 
WA_RPCNTAX_STR-MIAMT sy-vline 
WA_RPCNTAX_STR-IIAMT sy-vline 
WA_RPCNTAX_STR-BIAMT sy-vline 
WA_RPCNTAX_STR-PHFAM sy-vline 
WA_RPCNTAX_STR-ENTXI sy-vline 
WA_RPCNTAX_STR-PERNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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