ABAP Select data from SAP table AKKB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM AKKB
*  INTO TABLE @DATA(IT_AKKB2).
*--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_AKKB INDEX 1 INTO DATA(WA_AKKB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<AKKB>-MANDT = 1.
<AKKB>-LCNUM = 1.
<AKKB>-BANKS = 1.
<AKKB>-BANKL = 1.
<AKKB>-BAFKT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_AKKB-BAANR, sy-vline,
  WA_AKKB-BANGB_P, sy-vline,
  WA_AKKB-BANGB, sy-vline,
  WA_AKKB-WAERS, sy-vline,
  WA_AKKB-CADNR, sy-vline,
  WA_AKKB-INTER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_AKKB 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_AKKB 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_AKKB INTO WA_AKKB.


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

*Conversion exit ALPHA, internal->external for field CADNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_AKKB-CADNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_AKKB-CADNR.
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_AKKB_STR, 
MANDT TYPE STRING,
LCNUM TYPE STRING,
BANKS TYPE STRING,
BANKL TYPE STRING,
BAFKT TYPE STRING,
BAANR TYPE STRING,
BANGB_P TYPE STRING,
BANGB TYPE STRING,
WAERS TYPE STRING,
CADNR TYPE STRING,
INTER TYPE STRING,
BMAXI TYPE STRING,
BAAFS TYPE STRING,
AKBNMES TYPE STRING,
BANFS TYPE STRING,
OBFLAG TYPE STRING,
CPD_BANK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_AKKB_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_AKKB_STR-MANDT sy-vline 
WA_AKKB_STR-LCNUM sy-vline 
WA_AKKB_STR-BANKS sy-vline 
WA_AKKB_STR-BANKL sy-vline 
WA_AKKB_STR-BAFKT sy-vline 
WA_AKKB_STR-BAANR sy-vline 
WA_AKKB_STR-BANGB_P sy-vline 
WA_AKKB_STR-BANGB sy-vline 
WA_AKKB_STR-WAERS sy-vline 
WA_AKKB_STR-CADNR sy-vline 
WA_AKKB_STR-INTER sy-vline 
WA_AKKB_STR-BMAXI sy-vline 
WA_AKKB_STR-BAAFS sy-vline 
WA_AKKB_STR-AKBNMES sy-vline 
WA_AKKB_STR-BANFS sy-vline 
WA_AKKB_STR-OBFLAG sy-vline 
WA_AKKB_STR-CPD_BANK sy-vline      INTO ld_text SEPARATED BY SPACE.

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