ABAP Select data from SAP table RELAFLDS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RELAFLDS
*  INTO TABLE @DATA(IT_RELAFLDS2).
*--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_RELAFLDS INDEX 1 INTO DATA(WA_RELAFLDS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RELAFLDS>-MANDT = 1.
<RELAFLDS>-INTRENO = 1.
<RELAFLDS>-LAND1 = 1.
<RELAFLDS>-BUNDESLAND = 1.
<RELAFLDS>-GEMARKUNG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RELAFLDS-FLUR, sy-vline,
  WA_RELAFLDS-FLURSTUECK, sy-vline,
  WA_RELAFLDS-KREIS, sy-vline,
  WA_RELAFLDS-GEMEINDE, sy-vline,
  WA_RELAFLDS-REGBEZIRK, sy-vline,
  WA_RELAFLDS-STADTBEZIRK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RELAFLDS 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_RELAFLDS 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_RELAFLDS INTO WA_RELAFLDS.


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

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

*Conversion exit ALPHA, internal->external for field AKT_EIGENTUEMER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RELAFLDS-AKT_EIGENTUEMER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RELAFLDS-AKT_EIGENTUEMER.
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_RELAFLDS_STR, 
MANDT TYPE STRING,
INTRENO TYPE STRING,
LAND1 TYPE STRING,
BUNDESLAND TYPE STRING,
GEMARKUNG TYPE STRING,
FLUR TYPE STRING,
FLURSTUECK TYPE STRING,
KREIS TYPE STRING,
GEMEINDE TYPE STRING,
REGBEZIRK TYPE STRING,
STADTBEZIRK TYPE STRING,
STADTTEIL TYPE STRING,
PARTNR_KATAMT TYPE STRING,
GSBER TYPE STRING,
GUELTIG_VON_F TYPE STRING,
GUELTIG_BIS TYPE STRING,
BERGRUPPE TYPE STRING,
BEMERKUNG_KAT TYPE STRING,
AKT_EIGENTUEMER TYPE STRING,
AKT_PARTID TYPE STRING,
BEWERTUNG TYPE STRING,
RERF TYPE STRING,
DERF TYPE STRING,
TERF TYPE STRING,
REHER TYPE STRING,
RBEAR TYPE STRING,
DBEAR TYPE STRING,
TBEAR TYPE STRING,
RBHER TYPE STRING,
VBUKRS TYPE STRING,
CHECK_1 TYPE STRING,
CHECK_2 TYPE STRING,
CHECK_3 TYPE STRING,
CHECK_4 TYPE STRING,
CHECK_5 TYPE STRING,
CHECK_6 TYPE STRING,
CHECK_7 TYPE STRING,
CHECK_8 TYPE STRING,
CHECK_9 TYPE STRING,
CHECK_10 TYPE STRING,
CHECK_11 TYPE STRING,
BUT_SEL_ALL TYPE STRING,
BUT_UNSEL_ALL TYPE STRING,
CHECK_USE_PREDATA TYPE STRING,
GUELTIG_VON TYPE STRING,
STICHTAG TYPE STRING,
PARTNR_KATAMT_EXT TYPE STRING,
PUSH_KATAST_CREATE TYPE STRING,
PUSH_KATAST_DELETE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RELAFLDS_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_RELAFLDS_STR-MANDT sy-vline 
WA_RELAFLDS_STR-INTRENO sy-vline 
WA_RELAFLDS_STR-LAND1 sy-vline 
WA_RELAFLDS_STR-BUNDESLAND sy-vline 
WA_RELAFLDS_STR-GEMARKUNG sy-vline 
WA_RELAFLDS_STR-FLUR sy-vline 
WA_RELAFLDS_STR-FLURSTUECK sy-vline 
WA_RELAFLDS_STR-KREIS sy-vline 
WA_RELAFLDS_STR-GEMEINDE sy-vline 
WA_RELAFLDS_STR-REGBEZIRK sy-vline 
WA_RELAFLDS_STR-STADTBEZIRK sy-vline 
WA_RELAFLDS_STR-STADTTEIL sy-vline 
WA_RELAFLDS_STR-PARTNR_KATAMT sy-vline 
WA_RELAFLDS_STR-GSBER sy-vline 
WA_RELAFLDS_STR-GUELTIG_VON_F sy-vline 
WA_RELAFLDS_STR-GUELTIG_BIS sy-vline 
WA_RELAFLDS_STR-BERGRUPPE sy-vline 
WA_RELAFLDS_STR-BEMERKUNG_KAT sy-vline 
WA_RELAFLDS_STR-AKT_EIGENTUEMER sy-vline 
WA_RELAFLDS_STR-AKT_PARTID sy-vline 
WA_RELAFLDS_STR-BEWERTUNG sy-vline 
WA_RELAFLDS_STR-RERF sy-vline 
WA_RELAFLDS_STR-DERF sy-vline 
WA_RELAFLDS_STR-TERF sy-vline 
WA_RELAFLDS_STR-REHER sy-vline 
WA_RELAFLDS_STR-RBEAR sy-vline 
WA_RELAFLDS_STR-DBEAR sy-vline 
WA_RELAFLDS_STR-TBEAR sy-vline 
WA_RELAFLDS_STR-RBHER sy-vline 
WA_RELAFLDS_STR-VBUKRS sy-vline 
WA_RELAFLDS_STR-CHECK_1 sy-vline 
WA_RELAFLDS_STR-CHECK_2 sy-vline 
WA_RELAFLDS_STR-CHECK_3 sy-vline 
WA_RELAFLDS_STR-CHECK_4 sy-vline 
WA_RELAFLDS_STR-CHECK_5 sy-vline 
WA_RELAFLDS_STR-CHECK_6 sy-vline 
WA_RELAFLDS_STR-CHECK_7 sy-vline 
WA_RELAFLDS_STR-CHECK_8 sy-vline 
WA_RELAFLDS_STR-CHECK_9 sy-vline 
WA_RELAFLDS_STR-CHECK_10 sy-vline 
WA_RELAFLDS_STR-CHECK_11 sy-vline 
WA_RELAFLDS_STR-BUT_SEL_ALL sy-vline 
WA_RELAFLDS_STR-BUT_UNSEL_ALL sy-vline 
WA_RELAFLDS_STR-CHECK_USE_PREDATA sy-vline 
WA_RELAFLDS_STR-GUELTIG_VON sy-vline 
WA_RELAFLDS_STR-STICHTAG sy-vline 
WA_RELAFLDS_STR-PARTNR_KATAMT_EXT sy-vline 
WA_RELAFLDS_STR-PUSH_KATAST_CREATE sy-vline 
WA_RELAFLDS_STR-PUSH_KATAST_DELETE sy-vline      INTO ld_text SEPARATED BY SPACE.

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