ABAP Select data from SAP table WAEL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WAEL
*  INTO TABLE @DATA(IT_WAEL2).
*--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_WAEL INDEX 1 INTO DATA(WA_WAEL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WAEL>-MANDT = 1.
<WAEL>-AKTNR = 1.
<WAEL>-ARTNR = 1.
<WAEL>-MEBME = 1.
<WAEL>-KUNNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WAEL-LWNUM, sy-vline,
  WA_WAEL-WERKS, sy-vline,
  WA_WAEL-WEDAT, sy-vline,
  WA_WAEL-WETYP, sy-vline,
  WA_WAEL-WEUZT, sy-vline,
  WA_WAEL-WEPRZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WAEL 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_WAEL 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_WAEL INTO WA_WAEL.


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

*Conversion exit MATN1, internal->external for field ARTNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_WAEL-ARTNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WAEL-ARTNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEBME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WAEL-MEBME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WAEL-MEBME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WAEL-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WAEL-KUNNR.
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_WAEL_STR, 
MANDT TYPE STRING,
AKTNR TYPE STRING,
ARTNR TYPE STRING,
MEBME TYPE STRING,
KUNNR TYPE STRING,
LWNUM TYPE STRING,
WERKS TYPE STRING,
WEDAT TYPE STRING,
WETYP TYPE STRING,
WEUZT TYPE STRING,
WEPRZ TYPE STRING,
AUFME TYPE STRING,
WMNGE TYPE STRING,
PAUFME TYPE STRING,
PABBM TYPE STRING,
VLFKZ TYPE STRING,
RUSTB TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WAEL_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_WAEL_STR-MANDT sy-vline 
WA_WAEL_STR-AKTNR sy-vline 
WA_WAEL_STR-ARTNR sy-vline 
WA_WAEL_STR-MEBME sy-vline 
WA_WAEL_STR-KUNNR sy-vline 
WA_WAEL_STR-LWNUM sy-vline 
WA_WAEL_STR-WERKS sy-vline 
WA_WAEL_STR-WEDAT sy-vline 
WA_WAEL_STR-WETYP sy-vline 
WA_WAEL_STR-WEUZT sy-vline 
WA_WAEL_STR-WEPRZ sy-vline 
WA_WAEL_STR-AUFME sy-vline 
WA_WAEL_STR-WMNGE sy-vline 
WA_WAEL_STR-PAUFME sy-vline 
WA_WAEL_STR-PABBM sy-vline 
WA_WAEL_STR-VLFKZ sy-vline 
WA_WAEL_STR-RUSTB sy-vline      INTO ld_text SEPARATED BY SPACE.

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