ABAP Select data from SAP table RELUER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RELUER
*  INTO TABLE @DATA(IT_RELUER2).
*--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_RELUER INDEX 1 INTO DATA(WA_RELUER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RELUER>-MANDT = 1.
<RELUER>-INTRENO = 1.
<RELUER>-COUNTRY = 1.
<RELUER>-STATE = 1.
<RELUER>-DISTRICT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RELUER-MUNICIPAL, sy-vline,
  WA_RELUER-SUBDISTRICT, sy-vline,
  WA_RELUER-ERPAGENO, sy-vline,
  WA_RELUER-AUTHGRP, sy-vline,
  WA_RELUER-RERF, sy-vline,
  WA_RELUER-DERF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RELUER 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_RELUER 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_RELUER INTO WA_RELUER.


*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_RELUER_STR, 
MANDT TYPE STRING,
INTRENO TYPE STRING,
COUNTRY TYPE STRING,
STATE TYPE STRING,
DISTRICT TYPE STRING,
MUNICIPAL TYPE STRING,
SUBDISTRICT TYPE STRING,
ERPAGENO TYPE STRING,
AUTHGRP 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,
MUNICIPALID TYPE STRING,
XMUNICIPAL TYPE STRING,
DISTRICTID TYPE STRING,
XSUBDISTRICT TYPE STRING,
XDISTRICT TYPE STRING,
SUBDISTRICTHEAD TYPE STRING,
ERPAGENOHEAD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RELUER_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_RELUER_STR-MANDT sy-vline 
WA_RELUER_STR-INTRENO sy-vline 
WA_RELUER_STR-COUNTRY sy-vline 
WA_RELUER_STR-STATE sy-vline 
WA_RELUER_STR-DISTRICT sy-vline 
WA_RELUER_STR-MUNICIPAL sy-vline 
WA_RELUER_STR-SUBDISTRICT sy-vline 
WA_RELUER_STR-ERPAGENO sy-vline 
WA_RELUER_STR-AUTHGRP sy-vline 
WA_RELUER_STR-RERF sy-vline 
WA_RELUER_STR-DERF sy-vline 
WA_RELUER_STR-TERF sy-vline 
WA_RELUER_STR-REHER sy-vline 
WA_RELUER_STR-RBEAR sy-vline 
WA_RELUER_STR-DBEAR sy-vline 
WA_RELUER_STR-TBEAR sy-vline 
WA_RELUER_STR-RBHER sy-vline 
WA_RELUER_STR-MUNICIPALID sy-vline 
WA_RELUER_STR-XMUNICIPAL sy-vline 
WA_RELUER_STR-DISTRICTID sy-vline 
WA_RELUER_STR-XSUBDISTRICT sy-vline 
WA_RELUER_STR-XDISTRICT sy-vline 
WA_RELUER_STR-SUBDISTRICTHEAD sy-vline 
WA_RELUER_STR-ERPAGENOHEAD sy-vline      INTO ld_text SEPARATED BY SPACE.

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