ABAP Select data from SAP table ATPGC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ATPGC
*  INTO TABLE @DATA(IT_ATPGC2).
*--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_ATPGC INDEX 1 INTO DATA(WA_ATPGC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ATPGC>-GSBTR = 1.
<ATPGC>-TBSTR = 1.
<ATPGC>-TBSMG = 1.
<ATPGC>-GSMNG = 1.
<ATPGC>-MEINS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ATPGC-PEDTR, sy-vline,
  WA_ATPGC-BSFAK, sy-vline,
  WA_ATPGC-BSDIF, sy-vline,
  WA_ATPGC-VFMNG, sy-vline,
  WA_ATPGC-SUMAG, sy-vline,
  WA_ATPGC-SUMBA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ATPGC 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_ATPGC 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_ATPGC INTO WA_ATPGC.


*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 CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_ATPGC-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ATPGC-MEINS.
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_ATPGC_STR, 
GSBTR TYPE STRING,
TBSTR TYPE STRING,
TBSMG TYPE STRING,
GSMNG TYPE STRING,
MEINS TYPE STRING,
PEDTR TYPE STRING,
BSFAK TYPE STRING,
BSDIF TYPE STRING,
VFMNG TYPE STRING,
SUMAG TYPE STRING,
SUMBA TYPE STRING,
SUMZG TYPE STRING,
ATPM1 TYPE STRING,
WBEST TYPE STRING,
ANDEC TYPE STRING,
RPFLG TYPE STRING,
TBDIF TYPE STRING,
TBFAK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ATPGC_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_ATPGC_STR-GSBTR sy-vline 
WA_ATPGC_STR-TBSTR sy-vline 
WA_ATPGC_STR-TBSMG sy-vline 
WA_ATPGC_STR-GSMNG sy-vline 
WA_ATPGC_STR-MEINS sy-vline 
WA_ATPGC_STR-PEDTR sy-vline 
WA_ATPGC_STR-BSFAK sy-vline 
WA_ATPGC_STR-BSDIF sy-vline 
WA_ATPGC_STR-VFMNG sy-vline 
WA_ATPGC_STR-SUMAG sy-vline 
WA_ATPGC_STR-SUMBA sy-vline 
WA_ATPGC_STR-SUMZG sy-vline 
WA_ATPGC_STR-ATPM1 sy-vline 
WA_ATPGC_STR-WBEST sy-vline 
WA_ATPGC_STR-ANDEC sy-vline 
WA_ATPGC_STR-RPFLG sy-vline 
WA_ATPGC_STR-TBDIF sy-vline 
WA_ATPGC_STR-TBFAK sy-vline      INTO ld_text SEPARATED BY SPACE.

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