ABAP Select data from SAP table E1WLK1M into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP E1WLK1M 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 E1WLK1M. 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 E1WLK1M 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_E1WLK1M TYPE STANDARD TABLE OF E1WLK1M,
      WA_E1WLK1M TYPE E1WLK1M,
      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: <E1WLK1M> TYPE E1WLK1M.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_E1WLK1M.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM E1WLK1M
  INTO TABLE IT_E1WLK1M.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM E1WLK1M
*  INTO TABLE @DATA(IT_E1WLK1M2).
*--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_E1WLK1M INDEX 1 INTO DATA(WA_E1WLK1M2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_E1WLK1M ASSIGNING <E1WLK1M>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<E1WLK1M>-MSGFN = 1.
<E1WLK1M>-FILIA = 1.
<E1WLK1M>-VRKME = 1.
<E1WLK1M>-DATBI = 1.
<E1WLK1M>-DATAB = 1.

ENDLOOP.

LOOP AT IT_E1WLK1M INTO WA_E1WLK1M.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_E1WLK1M-QUELL, sy-vline,
  WA_E1WLK1M-PFLKN, sy-vline,
  WA_E1WLK1M-NEGAT, sy-vline,
  WA_E1WLK1M-AKTIO, sy-vline,
  WA_E1WLK1M-THEMA, sy-vline,
  WA_E1WLK1M-STRLI, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_E1WLK1M 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_E1WLK1M 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_E1WLK1M INTO WA_E1WLK1M.


*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_E1WLK1M_STR, 
MSGFN TYPE STRING,
FILIA TYPE STRING,
VRKME TYPE STRING,
DATBI TYPE STRING,
DATAB TYPE STRING,
QUELL TYPE STRING,
PFLKN TYPE STRING,
NEGAT TYPE STRING,
AKTIO TYPE STRING,
THEMA TYPE STRING,
STRLI TYPE STRING,
SSTAT TYPE STRING,
LIFNR TYPE STRING,
URSAC TYPE STRING,
STRNR TYPE STRING,
LAYGR TYPE STRING,
LAYMOD_VER TYPE STRING,
STRNR_EXTERNAL TYPE STRING,
STRNR_VERSION TYPE STRING,
STRNR_GUID TYPE STRING,
STRNR_LONG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_E1WLK1M_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_E1WLK1M_STR-MSGFN sy-vline 
WA_E1WLK1M_STR-FILIA sy-vline 
WA_E1WLK1M_STR-VRKME sy-vline 
WA_E1WLK1M_STR-DATBI sy-vline 
WA_E1WLK1M_STR-DATAB sy-vline 
WA_E1WLK1M_STR-QUELL sy-vline 
WA_E1WLK1M_STR-PFLKN sy-vline 
WA_E1WLK1M_STR-NEGAT sy-vline 
WA_E1WLK1M_STR-AKTIO sy-vline 
WA_E1WLK1M_STR-THEMA sy-vline 
WA_E1WLK1M_STR-STRLI sy-vline 
WA_E1WLK1M_STR-SSTAT sy-vline 
WA_E1WLK1M_STR-LIFNR sy-vline 
WA_E1WLK1M_STR-URSAC sy-vline 
WA_E1WLK1M_STR-STRNR sy-vline 
WA_E1WLK1M_STR-LAYGR sy-vline 
WA_E1WLK1M_STR-LAYMOD_VER sy-vline 
WA_E1WLK1M_STR-STRNR_EXTERNAL sy-vline 
WA_E1WLK1M_STR-STRNR_VERSION sy-vline 
WA_E1WLK1M_STR-STRNR_GUID sy-vline 
WA_E1WLK1M_STR-STRNR_LONG sy-vline      INTO ld_text SEPARATED BY SPACE.

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