ABAP Select data from SAP table WAKL2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WAKL2 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 WAKL2. 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 WAKL2 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_WAKL2 TYPE STANDARD TABLE OF WAKL2,
      WA_WAKL2 TYPE WAKL2,
      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: <WAKL2> TYPE WAKL2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_WAKL2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM WAKL2
  INTO TABLE IT_WAKL2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WAKL2
*  INTO TABLE @DATA(IT_WAKL22).
*--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_WAKL2 INDEX 1 INTO DATA(WA_WAKL22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_WAKL2 ASSIGNING <WAKL2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WAKL2>-FILNR = 1.
<WAKL2>-NAME1 = 1.
<WAKL2>-CLASS = 1.
<WAKL2>-MANDT = 1.
<WAKL2>-AKTNR = 1.

ENDLOOP.

LOOP AT IT_WAKL2 INTO WA_WAKL2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WAKL2-CLINT, sy-vline,
  WA_WAKL2-AVKVO, sy-vline,
  WA_WAKL2-AVKBI, sy-vline,
  WA_WAKL2-ALIVO, sy-vline,
  WA_WAKL2-ALIBI, sy-vline,
  WA_WAKL2-AWEFI, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WAKL2 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_WAKL2 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_WAKL2 INTO WA_WAKL2.


*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 FILNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WAKL2-FILNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WAKL2-FILNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AKTNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WAKL2-AKTNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WAKL2-AKTNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VLGNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WAKL2-VLGNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WAKL2-VLGNR.
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_WAKL2_STR, 
FILNR TYPE STRING,
NAME1 TYPE STRING,
CLASS TYPE STRING,
MANDT TYPE STRING,
AKTNR TYPE STRING,
CLINT TYPE STRING,
AVKVO TYPE STRING,
AVKBI TYPE STRING,
ALIVO TYPE STRING,
ALIBI TYPE STRING,
AWEFI TYPE STRING,
ETIAG TYPE STRING,
BEKTY TYPE STRING,
ABEKM TYPE STRING,
STBEK TYPE STRING,
RUDAT TYPE STRING,
NBSZO TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
AENAM TYPE STRING,
AEDAT TYPE STRING,
FADAT TYPE STRING,
SADAT TYPE STRING,
FLDAT TYPE STRING,
SLDAT TYPE STRING,
KLART TYPE STRING,
VLGNR TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
KALKE TYPE STRING,
STPLGR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WAKL2_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_WAKL2_STR-FILNR sy-vline 
WA_WAKL2_STR-NAME1 sy-vline 
WA_WAKL2_STR-CLASS sy-vline 
WA_WAKL2_STR-MANDT sy-vline 
WA_WAKL2_STR-AKTNR sy-vline 
WA_WAKL2_STR-CLINT sy-vline 
WA_WAKL2_STR-AVKVO sy-vline 
WA_WAKL2_STR-AVKBI sy-vline 
WA_WAKL2_STR-ALIVO sy-vline 
WA_WAKL2_STR-ALIBI sy-vline 
WA_WAKL2_STR-AWEFI sy-vline 
WA_WAKL2_STR-ETIAG sy-vline 
WA_WAKL2_STR-BEKTY sy-vline 
WA_WAKL2_STR-ABEKM sy-vline 
WA_WAKL2_STR-STBEK sy-vline 
WA_WAKL2_STR-RUDAT sy-vline 
WA_WAKL2_STR-NBSZO sy-vline 
WA_WAKL2_STR-ERNAM sy-vline 
WA_WAKL2_STR-ERDAT sy-vline 
WA_WAKL2_STR-AENAM sy-vline 
WA_WAKL2_STR-AEDAT sy-vline 
WA_WAKL2_STR-FADAT sy-vline 
WA_WAKL2_STR-SADAT sy-vline 
WA_WAKL2_STR-FLDAT sy-vline 
WA_WAKL2_STR-SLDAT sy-vline 
WA_WAKL2_STR-KLART sy-vline 
WA_WAKL2_STR-VLGNR sy-vline 
WA_WAKL2_STR-VKORG sy-vline 
WA_WAKL2_STR-VTWEG sy-vline 
WA_WAKL2_STR-KALKE sy-vline 
WA_WAKL2_STR-STPLGR sy-vline      INTO ld_text SEPARATED BY SPACE.

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