ABAP Select data from SAP table WEWU into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WEWU
*  INTO TABLE @DATA(IT_WEWU2).
*--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_WEWU INDEX 1 INTO DATA(WA_WEWU2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WEWU>-MANDT = 1.
<WEWU>-EWUVW = 1.
<WEWU>-EWUOA = 1.
<WEWU>-EWUOS = 1.
<WEWU>-WRSVO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WEWU-UMDAT, sy-vline,
  WA_WEWU-WRSNA, sy-vline,
  WA_WEWU-BNDAT, sy-vline,
  WA_WEWU-KONAM, sy-vline,
  WA_WEWU-BENAM, sy-vline,
  WA_WEWU-BEORO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WEWU 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_WEWU 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_WEWU INTO WA_WEWU.


*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_WEWU-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WEWU-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_WEWU_STR, 
MANDT TYPE STRING,
EWUVW TYPE STRING,
EWUOA TYPE STRING,
EWUOS TYPE STRING,
WRSVO TYPE STRING,
UMDAT TYPE STRING,
WRSNA TYPE STRING,
BNDAT TYPE STRING,
KONAM TYPE STRING,
BENAM TYPE STRING,
BEORO TYPE STRING,
ERDAT TYPE STRING,
BADAT TYPE STRING,
FRDAT TYPE STRING,
UMSTA TYPE STRING,
BAZET TYPE STRING,
BELNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WEWU_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_WEWU_STR-MANDT sy-vline 
WA_WEWU_STR-EWUVW sy-vline 
WA_WEWU_STR-EWUOA sy-vline 
WA_WEWU_STR-EWUOS sy-vline 
WA_WEWU_STR-WRSVO sy-vline 
WA_WEWU_STR-UMDAT sy-vline 
WA_WEWU_STR-WRSNA sy-vline 
WA_WEWU_STR-BNDAT sy-vline 
WA_WEWU_STR-KONAM sy-vline 
WA_WEWU_STR-BENAM sy-vline 
WA_WEWU_STR-BEORO sy-vline 
WA_WEWU_STR-ERDAT sy-vline 
WA_WEWU_STR-BADAT sy-vline 
WA_WEWU_STR-FRDAT sy-vline 
WA_WEWU_STR-UMSTA sy-vline 
WA_WEWU_STR-BAZET sy-vline 
WA_WEWU_STR-BELNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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