ABAP Select data from SAP table RNNOK_RELX into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNNOK_RELX
*  INTO TABLE @DATA(IT_RNNOK_RELX2).
*--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_RNNOK_RELX INDEX 1 INTO DATA(WA_RNNOK_RELX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNNOK_RELX>-DATE_TOX = 1.
<RNNOK_RELX>-DATE_FROMX = 1.
<RNNOK_RELX>-RELTYPX = 1.
<RNNOK_RELX>-DFTVALX = 1.
<RNNOK_RELX>-RLTYPX = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNNOK_RELX-RELKINDX, sy-vline,
  WA_RNNOK_RELX-XDFRELX, sy-vline,
  WA_RNNOK_RELX-XATTRX, sy-vline,
  WA_RNNOK_RELX-XMUSTX, sy-vline,
  WA_RNNOK_RELX-XDONEX, sy-vline,
  WA_RNNOK_RELX-XDIRECTIONX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNNOK_RELX 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_RNNOK_RELX 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_RNNOK_RELX INTO WA_RNNOK_RELX.


*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_RNNOK_RELX_STR, 
DATE_TOX TYPE STRING,
DATE_FROMX TYPE STRING,
RELTYPX TYPE STRING,
DFTVALX TYPE STRING,
RLTYPX TYPE STRING,
RELKINDX TYPE STRING,
XDFRELX TYPE STRING,
XATTRX TYPE STRING,
XMUSTX TYPE STRING,
XDONEX TYPE STRING,
XDIRECTIONX TYPE STRING,
XENQ_RX TYPE STRING,
XENQ_PX TYPE STRING,
XCHNGX TYPE STRING,
XFMODX TYPE STRING,
RELSHIP_CHINDX TYPE STRING,
RELATIONX TYPE STRING,
LEGAL_REPX TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNNOK_RELX_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_RNNOK_RELX_STR-DATE_TOX sy-vline 
WA_RNNOK_RELX_STR-DATE_FROMX sy-vline 
WA_RNNOK_RELX_STR-RELTYPX sy-vline 
WA_RNNOK_RELX_STR-DFTVALX sy-vline 
WA_RNNOK_RELX_STR-RLTYPX sy-vline 
WA_RNNOK_RELX_STR-RELKINDX sy-vline 
WA_RNNOK_RELX_STR-XDFRELX sy-vline 
WA_RNNOK_RELX_STR-XATTRX sy-vline 
WA_RNNOK_RELX_STR-XMUSTX sy-vline 
WA_RNNOK_RELX_STR-XDONEX sy-vline 
WA_RNNOK_RELX_STR-XDIRECTIONX sy-vline 
WA_RNNOK_RELX_STR-XENQ_RX sy-vline 
WA_RNNOK_RELX_STR-XENQ_PX sy-vline 
WA_RNNOK_RELX_STR-XCHNGX sy-vline 
WA_RNNOK_RELX_STR-XFMODX sy-vline 
WA_RNNOK_RELX_STR-RELSHIP_CHINDX sy-vline 
WA_RNNOK_RELX_STR-RELATIONX sy-vline 
WA_RNNOK_RELX_STR-LEGAL_REPX sy-vline      INTO ld_text SEPARATED BY SPACE.

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