ABAP Select data from SAP table IAKB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IAKB
*  INTO TABLE @DATA(IT_IAKB2).
*--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_IAKB INDEX 1 INTO DATA(WA_IAKB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IAKB>-ERLDAT = 1.
<IAKB>-HWABG = 1.
<IAKB>-SUMHW = 1.
<IAKB>-SUMTW = 1.
<IAKB>-SUMHWAPP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IAKB-SUMTWAPP, sy-vline,
  WA_IAKB-SUMDELTAHW, sy-vline,
  WA_IAKB-SUMDELTATW, sy-vline,
  WA_IAKB-HWREVAL, sy-vline,
  WA_IAKB-HWREVALAPP, sy-vline,
  WA_IAKB-SUMREV, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IAKB 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_IAKB 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_IAKB INTO WA_IAKB.


*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 LOTKZ
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IAKB-LOTKZ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IAKB-LOTKZ.
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_IAKB_STR, 
ERLDAT TYPE STRING,
HWABG TYPE STRING,
SUMHW TYPE STRING,
SUMTW TYPE STRING,
SUMHWAPP TYPE STRING,
SUMTWAPP TYPE STRING,
SUMDELTAHW TYPE STRING,
SUMDELTATW TYPE STRING,
HWREVAL TYPE STRING,
HWREVALAPP TYPE STRING,
SUMREV TYPE STRING,
SUMREVAPP TYPE STRING,
REVSUM TYPE STRING,
REVAPPSUM TYPE STRING,
LOTKZ TYPE STRING,
ITABKEY TYPE STRING,
LINK_FIRST TYPE STRING,
INEX_INCR TYPE STRING,
INEX_CHANG TYPE STRING,
KRIT_CHANG TYPE STRING,
HWABBANZ TYPE STRING,
WTABBANZ TYPE STRING,
HWABBANF TYPE STRING,
WTABBANF TYPE STRING,
HWABGANZ TYPE STRING,
WTABGANZ TYPE STRING,
HWABGANF TYPE STRING,
WTABGANF TYPE STRING,
WTABGMAX TYPE STRING,
HWABGMAX TYPE STRING,
WTCONS_APP TYPE STRING,
HWCONS_APP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IAKB_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_IAKB_STR-ERLDAT sy-vline 
WA_IAKB_STR-HWABG sy-vline 
WA_IAKB_STR-SUMHW sy-vline 
WA_IAKB_STR-SUMTW sy-vline 
WA_IAKB_STR-SUMHWAPP sy-vline 
WA_IAKB_STR-SUMTWAPP sy-vline 
WA_IAKB_STR-SUMDELTAHW sy-vline 
WA_IAKB_STR-SUMDELTATW sy-vline 
WA_IAKB_STR-HWREVAL sy-vline 
WA_IAKB_STR-HWREVALAPP sy-vline 
WA_IAKB_STR-SUMREV sy-vline 
WA_IAKB_STR-SUMREVAPP sy-vline 
WA_IAKB_STR-REVSUM sy-vline 
WA_IAKB_STR-REVAPPSUM sy-vline 
WA_IAKB_STR-LOTKZ sy-vline 
WA_IAKB_STR-ITABKEY sy-vline 
WA_IAKB_STR-LINK_FIRST sy-vline 
WA_IAKB_STR-INEX_INCR sy-vline 
WA_IAKB_STR-INEX_CHANG sy-vline 
WA_IAKB_STR-KRIT_CHANG sy-vline 
WA_IAKB_STR-HWABBANZ sy-vline 
WA_IAKB_STR-WTABBANZ sy-vline 
WA_IAKB_STR-HWABBANF sy-vline 
WA_IAKB_STR-WTABBANF sy-vline 
WA_IAKB_STR-HWABGANZ sy-vline 
WA_IAKB_STR-WTABGANZ sy-vline 
WA_IAKB_STR-HWABGANF sy-vline 
WA_IAKB_STR-WTABGANF sy-vline 
WA_IAKB_STR-WTABGMAX sy-vline 
WA_IAKB_STR-HWABGMAX sy-vline 
WA_IAKB_STR-WTCONS_APP sy-vline 
WA_IAKB_STR-HWCONS_APP sy-vline      INTO ld_text SEPARATED BY SPACE.

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