ABAP Select data from SAP table RNNOK_REL into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNNOK_REL 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_REL. 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_REL 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_REL TYPE STANDARD TABLE OF RNNOK_REL,
      WA_RNNOK_REL TYPE RNNOK_REL,
      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_REL> TYPE RNNOK_REL.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNNOK_REL
*  INTO TABLE @DATA(IT_RNNOK_REL2).
*--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_REL INDEX 1 INTO DATA(WA_RNNOK_REL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNNOK_REL>-CLIENT = 1.
<RNNOK_REL>-RELNR = 1.
<RNNOK_REL>-PARTNER1 = 1.
<RNNOK_REL>-PARTNER2 = 1.
<RNNOK_REL>-DATE_TO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNNOK_REL-DATE_FROM, sy-vline,
  WA_RNNOK_REL-RELTYP, sy-vline,
  WA_RNNOK_REL-XRF, sy-vline,
  WA_RNNOK_REL-DFTVAL, sy-vline,
  WA_RNNOK_REL-RLTYP, sy-vline,
  WA_RNNOK_REL-RELKIND, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNNOK_REL 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_REL 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_REL INTO WA_RNNOK_REL.


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

*Conversion exit ALPHA, internal->external for field PARTNER1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNNOK_REL-PARTNER1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNNOK_REL-PARTNER1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PARTNER2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNNOK_REL-PARTNER2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNNOK_REL-PARTNER2.
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_RNNOK_REL_STR, 
CLIENT TYPE STRING,
RELNR TYPE STRING,
PARTNER1 TYPE STRING,
PARTNER2 TYPE STRING,
DATE_TO TYPE STRING,
DATE_FROM TYPE STRING,
RELTYP TYPE STRING,
XRF TYPE STRING,
DFTVAL TYPE STRING,
RLTYP TYPE STRING,
RELKIND TYPE STRING,
CRUSR TYPE STRING,
CRDAT TYPE STRING,
CRTIM TYPE STRING,
CHUSR TYPE STRING,
CHDAT TYPE STRING,
CHTIM TYPE STRING,
XDFREL TYPE STRING,
XDFREL2 TYPE STRING,
DB_KEY TYPE STRING,
DB_KEY_TD TYPE STRING,
XATTR TYPE STRING,
XMUST TYPE STRING,
XDONE TYPE STRING,
XDIRECTION TYPE STRING,
XENQ_R TYPE STRING,
XENQ_P TYPE STRING,
XCHNG TYPE STRING,
XFMOD TYPE STRING,
RELSHIP_CHIND TYPE STRING,
RELATION TYPE STRING,
LEGAL_REP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNNOK_REL_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_REL_STR-CLIENT sy-vline 
WA_RNNOK_REL_STR-RELNR sy-vline 
WA_RNNOK_REL_STR-PARTNER1 sy-vline 
WA_RNNOK_REL_STR-PARTNER2 sy-vline 
WA_RNNOK_REL_STR-DATE_TO sy-vline 
WA_RNNOK_REL_STR-DATE_FROM sy-vline 
WA_RNNOK_REL_STR-RELTYP sy-vline 
WA_RNNOK_REL_STR-XRF sy-vline 
WA_RNNOK_REL_STR-DFTVAL sy-vline 
WA_RNNOK_REL_STR-RLTYP sy-vline 
WA_RNNOK_REL_STR-RELKIND sy-vline 
WA_RNNOK_REL_STR-CRUSR sy-vline 
WA_RNNOK_REL_STR-CRDAT sy-vline 
WA_RNNOK_REL_STR-CRTIM sy-vline 
WA_RNNOK_REL_STR-CHUSR sy-vline 
WA_RNNOK_REL_STR-CHDAT sy-vline 
WA_RNNOK_REL_STR-CHTIM sy-vline 
WA_RNNOK_REL_STR-XDFREL sy-vline 
WA_RNNOK_REL_STR-XDFREL2 sy-vline 
WA_RNNOK_REL_STR-DB_KEY sy-vline 
WA_RNNOK_REL_STR-DB_KEY_TD sy-vline 
WA_RNNOK_REL_STR-XATTR sy-vline 
WA_RNNOK_REL_STR-XMUST sy-vline 
WA_RNNOK_REL_STR-XDONE sy-vline 
WA_RNNOK_REL_STR-XDIRECTION sy-vline 
WA_RNNOK_REL_STR-XENQ_R sy-vline 
WA_RNNOK_REL_STR-XENQ_P sy-vline 
WA_RNNOK_REL_STR-XCHNG sy-vline 
WA_RNNOK_REL_STR-XFMOD sy-vline 
WA_RNNOK_REL_STR-RELSHIP_CHIND sy-vline 
WA_RNNOK_REL_STR-RELATION sy-vline 
WA_RNNOK_REL_STR-LEGAL_REP sy-vline      INTO ld_text SEPARATED BY SPACE.

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