ABAP Select data from SAP table ATPK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ATPK
*  INTO TABLE @DATA(IT_ATPK2).
*--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_ATPK INDEX 1 INTO DATA(WA_ATPK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ATPK>-DELNR = 1.
<ATPK>-DELPS = 1.
<ATPK>-DELET = 1.
<ATPK>-DEL12 = 1.
<ATPK>-LGORT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ATPK-DISKZ, sy-vline,
  WA_ATPK-CHARG, sy-vline,
  WA_ATPK-DAT00, sy-vline,
  WA_ATPK-TAG00, sy-vline,
  WA_ATPK-SORT1, sy-vline,
  WA_ATPK-SORT2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ATPK 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_ATPK 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_ATPK INTO WA_ATPK.


*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 MATN1, internal->external for field BAUGR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_ATPK-BAUGR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ATPK-BAUGR.
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_ATPK_STR, 
DELNR TYPE STRING,
DELPS TYPE STRING,
DELET TYPE STRING,
DEL12 TYPE STRING,
LGORT TYPE STRING,
DISKZ TYPE STRING,
CHARG TYPE STRING,
DAT00 TYPE STRING,
TAG00 TYPE STRING,
SORT1 TYPE STRING,
SORT2 TYPE STRING,
DELKZ TYPE STRING,
MNG01 TYPE STRING,
MNG02 TYPE STRING,
ACCM_TYP TYPE STRING,
OPEN_QTY TYPE STRING,
BAUGR TYPE STRING,
EWERK TYPE STRING,
SGT_CATV TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ATPK_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_ATPK_STR-DELNR sy-vline 
WA_ATPK_STR-DELPS sy-vline 
WA_ATPK_STR-DELET sy-vline 
WA_ATPK_STR-DEL12 sy-vline 
WA_ATPK_STR-LGORT sy-vline 
WA_ATPK_STR-DISKZ sy-vline 
WA_ATPK_STR-CHARG sy-vline 
WA_ATPK_STR-DAT00 sy-vline 
WA_ATPK_STR-TAG00 sy-vline 
WA_ATPK_STR-SORT1 sy-vline 
WA_ATPK_STR-SORT2 sy-vline 
WA_ATPK_STR-DELKZ sy-vline 
WA_ATPK_STR-MNG01 sy-vline 
WA_ATPK_STR-MNG02 sy-vline 
WA_ATPK_STR-ACCM_TYP sy-vline 
WA_ATPK_STR-OPEN_QTY sy-vline 
WA_ATPK_STR-BAUGR sy-vline 
WA_ATPK_STR-EWERK sy-vline 
WA_ATPK_STR-SGT_CATV sy-vline      INTO ld_text SEPARATED BY SPACE.

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