ABAP Select data from SAP table EWIK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM EWIK
*  INTO TABLE @DATA(IT_EWIK2).
*--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_EWIK INDEX 1 INTO DATA(WA_EWIK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<EWIK>-MANDT = 1.
<EWIK>-WGRUPPE = 1.
<EWIK>-WNUMMER = 1.
<EWIK>-WANDART = 1.
<EWIK>-WTYP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_EWIK-WART, sy-vline,
  WA_EWIK-WSPANN, sy-vline,
  WA_EWIK-WSTROM, sy-vline,
  WA_EWIK-WLEIST, sy-vline,
  WA_EWIK-WLEIST_C, sy-vline,
  WA_EWIK-WGKLASSE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_EWIK 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_EWIK 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_EWIK INTO WA_EWIK.


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

*Conversion exit NVOLT, internal->external for field NOMINALVOLT
CALL FUNCTION 'CONVERSION_EXIT_NVOLT_OUTPUT'
  EXPORTING
    input =                      WA_EWIK-NOMINALVOLT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EWIK-NOMINALVOLT.
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_EWIK_STR, 
MANDT TYPE STRING,
WGRUPPE TYPE STRING,
WNUMMER TYPE STRING,
WANDART TYPE STRING,
WTYP TYPE STRING,
WART TYPE STRING,
WSPANN TYPE STRING,
WSTROM TYPE STRING,
WLEIST TYPE STRING,
WLEIST_C TYPE STRING,
WGKLASSE TYPE STRING,
PRIMKENNZ TYPE STRING,
SECKENNZ TYPE STRING,
SUCHBEG TYPE STRING,
ERDAT TYPE STRING,
ERNAM TYPE STRING,
AEDAT TYPE STRING,
AENAM TYPE STRING,
NOMINALVOLT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_EWIK_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_EWIK_STR-MANDT sy-vline 
WA_EWIK_STR-WGRUPPE sy-vline 
WA_EWIK_STR-WNUMMER sy-vline 
WA_EWIK_STR-WANDART sy-vline 
WA_EWIK_STR-WTYP sy-vline 
WA_EWIK_STR-WART sy-vline 
WA_EWIK_STR-WSPANN sy-vline 
WA_EWIK_STR-WSTROM sy-vline 
WA_EWIK_STR-WLEIST sy-vline 
WA_EWIK_STR-WLEIST_C sy-vline 
WA_EWIK_STR-WGKLASSE sy-vline 
WA_EWIK_STR-PRIMKENNZ sy-vline 
WA_EWIK_STR-SECKENNZ sy-vline 
WA_EWIK_STR-SUCHBEG sy-vline 
WA_EWIK_STR-ERDAT sy-vline 
WA_EWIK_STR-ERNAM sy-vline 
WA_EWIK_STR-AEDAT sy-vline 
WA_EWIK_STR-AENAM sy-vline 
WA_EWIK_STR-NOMINALVOLT sy-vline      INTO ld_text SEPARATED BY SPACE.

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