ABAP Select data from SAP table ANKB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ANKB
*  INTO TABLE @DATA(IT_ANKB2).
*--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_ANKB INDEX 1 INTO DATA(WA_ANKB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ANKB>-MANDT = 1.
<ANKB>-ANLKL = 1.
<ANKB>-AFAPL = 1.
<ANKB>-AFABE = 1.
<ANKB>-BDATU = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ANKB-ADATU, sy-vline,
  WA_ANKB-ERNAM, sy-vline,
  WA_ANKB-ERDAT, sy-vline,
  WA_ANKB-AENAM, sy-vline,
  WA_ANKB-AEDAT, sy-vline,
  WA_ANKB-XSPEB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ANKB 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_ANKB 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_ANKB INTO WA_ANKB.


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

*Conversion exit ALPHA, internal->external for field KTOGR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ANKB-KTOGR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ANKB-KTOGR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ANLGR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ANKB-ANLGR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ANKB-ANLGR.
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_ANKB_STR, 
MANDT TYPE STRING,
ANLKL TYPE STRING,
AFAPL TYPE STRING,
AFABE TYPE STRING,
BDATU TYPE STRING,
ADATU TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
AENAM TYPE STRING,
AEDAT TYPE STRING,
XSPEB TYPE STRING,
XLOEV TYPE STRING,
FELEI TYPE STRING,
KTOGR TYPE STRING,
XNEGA TYPE STRING,
XGWGK TYPE STRING,
MINDJ TYPE STRING,
MINDP TYPE STRING,
MAXDJ TYPE STRING,
MAXDP TYPE STRING,
INVSL TYPE STRING,
AFASL TYPE STRING,
NDJAR TYPE STRING,
NDPER TYPE STRING,
NAPRZ TYPE STRING,
SAPRZ TYPE STRING,
WBIND TYPE STRING,
ALIND TYPE STRING,
APROP TYPE STRING,
XUNTA TYPE STRING,
XAFBE TYPE STRING,
ANLGR TYPE STRING,
J_1AARVKEY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ANKB_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_ANKB_STR-MANDT sy-vline 
WA_ANKB_STR-ANLKL sy-vline 
WA_ANKB_STR-AFAPL sy-vline 
WA_ANKB_STR-AFABE sy-vline 
WA_ANKB_STR-BDATU sy-vline 
WA_ANKB_STR-ADATU sy-vline 
WA_ANKB_STR-ERNAM sy-vline 
WA_ANKB_STR-ERDAT sy-vline 
WA_ANKB_STR-AENAM sy-vline 
WA_ANKB_STR-AEDAT sy-vline 
WA_ANKB_STR-XSPEB sy-vline 
WA_ANKB_STR-XLOEV sy-vline 
WA_ANKB_STR-FELEI sy-vline 
WA_ANKB_STR-KTOGR sy-vline 
WA_ANKB_STR-XNEGA sy-vline 
WA_ANKB_STR-XGWGK sy-vline 
WA_ANKB_STR-MINDJ sy-vline 
WA_ANKB_STR-MINDP sy-vline 
WA_ANKB_STR-MAXDJ sy-vline 
WA_ANKB_STR-MAXDP sy-vline 
WA_ANKB_STR-INVSL sy-vline 
WA_ANKB_STR-AFASL sy-vline 
WA_ANKB_STR-NDJAR sy-vline 
WA_ANKB_STR-NDPER sy-vline 
WA_ANKB_STR-NAPRZ sy-vline 
WA_ANKB_STR-SAPRZ sy-vline 
WA_ANKB_STR-WBIND sy-vline 
WA_ANKB_STR-ALIND sy-vline 
WA_ANKB_STR-APROP sy-vline 
WA_ANKB_STR-XUNTA sy-vline 
WA_ANKB_STR-XAFBE sy-vline 
WA_ANKB_STR-ANLGR sy-vline 
WA_ANKB_STR-J_1AARVKEY sy-vline      INTO ld_text SEPARATED BY SPACE.

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