ABAP Select data from SAP table RELUERES into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RELUERES
*  INTO TABLE @DATA(IT_RELUERES2).
*--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_RELUERES INDEX 1 INTO DATA(WA_RELUERES2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RELUERES>-MANDT = 1.
<RELUERES>-INTRENO = 1.
<RELUERES>-ESNUMBER = 1.
<RELUERES>-COUNTER = 1.
<RELUERES>-ERPAGE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RELUERES-ESTYPE, sy-vline,
  WA_RELUERES-DREGON, sy-vline,
  WA_RELUERES-DCHANGEON, sy-vline,
  WA_RELUERES-CHANGENO, sy-vline,
  WA_RELUERES-COUNTERCHANGENO, sy-vline,
  WA_RELUERES-DDELON, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RELUERES 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_RELUERES 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_RELUERES INTO WA_RELUERES.


*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_RELUERES_STR, 
MANDT TYPE STRING,
INTRENO TYPE STRING,
ESNUMBER TYPE STRING,
COUNTER TYPE STRING,
ERPAGE TYPE STRING,
ESTYPE TYPE STRING,
DREGON TYPE STRING,
DCHANGEON TYPE STRING,
CHANGENO TYPE STRING,
COUNTERCHANGENO TYPE STRING,
DDELON TYPE STRING,
INTRENORECN TYPE STRING,
TXIDR TYPE STRING,
TXIDC TYPE STRING,
ESRECNPART TYPE STRING,
XMESTYPE TYPE STRING,
BUKRS TYPE STRING,
RECNTYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RELUERES_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_RELUERES_STR-MANDT sy-vline 
WA_RELUERES_STR-INTRENO sy-vline 
WA_RELUERES_STR-ESNUMBER sy-vline 
WA_RELUERES_STR-COUNTER sy-vline 
WA_RELUERES_STR-ERPAGE sy-vline 
WA_RELUERES_STR-ESTYPE sy-vline 
WA_RELUERES_STR-DREGON sy-vline 
WA_RELUERES_STR-DCHANGEON sy-vline 
WA_RELUERES_STR-CHANGENO sy-vline 
WA_RELUERES_STR-COUNTERCHANGENO sy-vline 
WA_RELUERES_STR-DDELON sy-vline 
WA_RELUERES_STR-INTRENORECN sy-vline 
WA_RELUERES_STR-TXIDR sy-vline 
WA_RELUERES_STR-TXIDC sy-vline 
WA_RELUERES_STR-ESRECNPART sy-vline 
WA_RELUERES_STR-XMESTYPE sy-vline 
WA_RELUERES_STR-BUKRS sy-vline 
WA_RELUERES_STR-RECNTYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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