ABAP Select data from SAP table EFFAK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM EFFAK
*  INTO TABLE @DATA(IT_EFFAK2).
*--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_EFFAK INDEX 1 INTO DATA(WA_EFFAK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<EFFAK>-OPBEL = 1.
<EFFAK>-KUMBETRAG = 1.
<EFFAK>-OKUMBETRAG = 1.
<EFFAK>-MWSTBETRAG = 1.
<EFFAK>-OMWSTBETRK = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_EFFAK-FAEDN, sy-vline,
  WA_EFFAK-APERIODTXT, sy-vline,
  WA_EFFAK-AUGDT, sy-vline,
  WA_EFFAK-WAERS, sy-vline,
  WA_EFFAK-XAESP, sy-vline,
  WA_EFFAK-AENGR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_EFFAK 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_EFFAK 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_EFFAK INTO WA_EFFAK.


*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 OPBEL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_EFFAK-OPBEL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EFFAK-OPBEL.
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_EFFAK_STR, 
OPBEL TYPE STRING,
KUMBETRAG TYPE STRING,
OKUMBETRAG TYPE STRING,
MWSTBETRAG TYPE STRING,
OMWSTBETRK TYPE STRING,
FAEDN TYPE STRING,
APERIODTXT TYPE STRING,
AUGDT TYPE STRING,
WAERS TYPE STRING,
XAESP TYPE STRING,
AENGR TYPE STRING,
STPRZ TYPE STRING,
LOGNO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_EFFAK_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_EFFAK_STR-OPBEL sy-vline 
WA_EFFAK_STR-KUMBETRAG sy-vline 
WA_EFFAK_STR-OKUMBETRAG sy-vline 
WA_EFFAK_STR-MWSTBETRAG sy-vline 
WA_EFFAK_STR-OMWSTBETRK sy-vline 
WA_EFFAK_STR-FAEDN sy-vline 
WA_EFFAK_STR-APERIODTXT sy-vline 
WA_EFFAK_STR-AUGDT sy-vline 
WA_EFFAK_STR-WAERS sy-vline 
WA_EFFAK_STR-XAESP sy-vline 
WA_EFFAK_STR-AENGR sy-vline 
WA_EFFAK_STR-STPRZ sy-vline 
WA_EFFAK_STR-LOGNO sy-vline      INTO ld_text SEPARATED BY SPACE.

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