ABAP Select data from SAP table AMPKR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM AMPKR
*  INTO TABLE @DATA(IT_AMPKR2).
*--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_AMPKR INDEX 1 INTO DATA(WA_AMPKR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<AMPKR>-TBNAM = 1.
<AMPKR>-ICDN1 = 1.
<AMPKR>-FLG01 = 1.
<AMPKR>-AEN01 = 1.
<AMPKR>-AENPS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_AMPKR-FLP01, sy-vline,
  WA_AMPKR-MNG01, sy-vline,
  WA_AMPKR-XCODE, sy-vline,
  WA_AMPKR-FNSTR, sy-vline,
  WA_AMPKR-ALINE, sy-vline,
  WA_AMPKR-RCODE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_AMPKR 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_AMPKR 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_AMPKR INTO WA_AMPKR.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_AMPKR_STR, 
TBNAM TYPE STRING,
ICDN1 TYPE STRING,
FLG01 TYPE STRING,
AEN01 TYPE STRING,
AENPS TYPE STRING,
FLP01 TYPE STRING,
MNG01 TYPE STRING,
XCODE TYPE STRING,
FNSTR TYPE STRING,
ALINE TYPE STRING,
RCODE TYPE STRING,
BLINE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_AMPKR_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_AMPKR_STR-TBNAM sy-vline 
WA_AMPKR_STR-ICDN1 sy-vline 
WA_AMPKR_STR-FLG01 sy-vline 
WA_AMPKR_STR-AEN01 sy-vline 
WA_AMPKR_STR-AENPS sy-vline 
WA_AMPKR_STR-FLP01 sy-vline 
WA_AMPKR_STR-MNG01 sy-vline 
WA_AMPKR_STR-XCODE sy-vline 
WA_AMPKR_STR-FNSTR sy-vline 
WA_AMPKR_STR-ALINE sy-vline 
WA_AMPKR_STR-RCODE sy-vline 
WA_AMPKR_STR-BLINE sy-vline      INTO ld_text SEPARATED BY SPACE.

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