ABAP Select data from SAP table ANKP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ANKP
*  INTO TABLE @DATA(IT_ANKP2).
*--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_ANKP INDEX 1 INTO DATA(WA_ANKP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ANKP>-MANDT = 1.
<ANKP>-ANLKL = 1.
<ANKP>-AFAPL = 1.
<ANKP>-FELEI = 1.
<ANKP>-KTOGR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ANKP-ORD41, sy-vline,
  WA_ANKP-ORD42, sy-vline,
  WA_ANKP-ORD43, sy-vline,
  WA_ANKP-ORD44, sy-vline,
  WA_ANKP-GDLGRP, sy-vline,
  WA_ANKP-VMGLI, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ANKP 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_ANKP 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_ANKP INTO WA_ANKP.


*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_ANKP-ANLKL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ANKP-ANLKL.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field VMGLI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ANKP-VMGLI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ANKP-VMGLI.
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_ANKP_STR, 
MANDT TYPE STRING,
ANLKL TYPE STRING,
AFAPL TYPE STRING,
FELEI TYPE STRING,
KTOGR TYPE STRING,
ORD41 TYPE STRING,
ORD42 TYPE STRING,
ORD43 TYPE STRING,
ORD44 TYPE STRING,
GDLGRP TYPE STRING,
VMGLI TYPE STRING,
VSART TYPE STRING,
VSIND TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
AENAM TYPE STRING,
AEDAT TYPE STRING,
XLOEV TYPE STRING,
XSPER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ANKP_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_ANKP_STR-MANDT sy-vline 
WA_ANKP_STR-ANLKL sy-vline 
WA_ANKP_STR-AFAPL sy-vline 
WA_ANKP_STR-FELEI sy-vline 
WA_ANKP_STR-KTOGR sy-vline 
WA_ANKP_STR-ORD41 sy-vline 
WA_ANKP_STR-ORD42 sy-vline 
WA_ANKP_STR-ORD43 sy-vline 
WA_ANKP_STR-ORD44 sy-vline 
WA_ANKP_STR-GDLGRP sy-vline 
WA_ANKP_STR-VMGLI sy-vline 
WA_ANKP_STR-VSART sy-vline 
WA_ANKP_STR-VSIND sy-vline 
WA_ANKP_STR-ERNAM sy-vline 
WA_ANKP_STR-ERDAT sy-vline 
WA_ANKP_STR-AENAM sy-vline 
WA_ANKP_STR-AEDAT sy-vline 
WA_ANKP_STR-XLOEV sy-vline 
WA_ANKP_STR-XSPER sy-vline      INTO ld_text SEPARATED BY SPACE.

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