ABAP Select data from SAP table FMR_ALV_ERLK2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP FMR_ALV_ERLK2 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 FMR_ALV_ERLK2. 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 FMR_ALV_ERLK2 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_FMR_ALV_ERLK2 TYPE STANDARD TABLE OF FMR_ALV_ERLK2,
      WA_FMR_ALV_ERLK2 TYPE FMR_ALV_ERLK2,
      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: <FMR_ALV_ERLK2> TYPE FMR_ALV_ERLK2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_FMR_ALV_ERLK2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM FMR_ALV_ERLK2
  INTO TABLE IT_FMR_ALV_ERLK2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FMR_ALV_ERLK2
*  INTO TABLE @DATA(IT_FMR_ALV_ERLK22).
*--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_FMR_ALV_ERLK2 INDEX 1 INTO DATA(WA_FMR_ALV_ERLK22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_FMR_ALV_ERLK2 ASSIGNING <FMR_ALV_ERLK2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FMR_ALV_ERLK2>-BELNR = 1.
<FMR_ALV_ERLK2>-BLPOS = 1.
<FMR_ALV_ERLK2>-BLTYP = 1.
<FMR_ALV_ERLK2>-BLART = 1.
<FMR_ALV_ERLK2>-BUDAT = 1.

ENDLOOP.

LOOP AT IT_FMR_ALV_ERLK2 INTO WA_FMR_ALV_ERLK2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FMR_ALV_ERLK2-BUKRS, sy-vline,
  WA_FMR_ALV_ERLK2-KERFAS, sy-vline,
  WA_FMR_ALV_ERLK2-WAERS, sy-vline,
  WA_FMR_ALV_ERLK2-WTFREE, sy-vline,
  WA_FMR_ALV_ERLK2-WTGES, sy-vline,
  WA_FMR_ALV_ERLK2-FDATK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FMR_ALV_ERLK2 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_FMR_ALV_ERLK2 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_FMR_ALV_ERLK2 INTO WA_FMR_ALV_ERLK2.


*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 BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FMR_ALV_ERLK2-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FMR_ALV_ERLK2-BELNR.
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_FMR_ALV_ERLK2_STR, 
BELNR TYPE STRING,
BLPOS TYPE STRING,
BLTYP TYPE STRING,
BLART TYPE STRING,
BUDAT TYPE STRING,
BUKRS TYPE STRING,
KERFAS TYPE STRING,
WAERS TYPE STRING,
WTFREE TYPE STRING,
WTGES TYPE STRING,
FDATK TYPE STRING,
PTEXT TYPE STRING,
EF_GROUP_NUMBER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FMR_ALV_ERLK2_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_FMR_ALV_ERLK2_STR-BELNR sy-vline 
WA_FMR_ALV_ERLK2_STR-BLPOS sy-vline 
WA_FMR_ALV_ERLK2_STR-BLTYP sy-vline 
WA_FMR_ALV_ERLK2_STR-BLART sy-vline 
WA_FMR_ALV_ERLK2_STR-BUDAT sy-vline 
WA_FMR_ALV_ERLK2_STR-BUKRS sy-vline 
WA_FMR_ALV_ERLK2_STR-KERFAS sy-vline 
WA_FMR_ALV_ERLK2_STR-WAERS sy-vline 
WA_FMR_ALV_ERLK2_STR-WTFREE sy-vline 
WA_FMR_ALV_ERLK2_STR-WTGES sy-vline 
WA_FMR_ALV_ERLK2_STR-FDATK sy-vline 
WA_FMR_ALV_ERLK2_STR-PTEXT sy-vline 
WA_FMR_ALV_ERLK2_STR-EF_GROUP_NUMBER sy-vline      INTO ld_text SEPARATED BY SPACE.

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