ABAP Select data from SAP table AHS_S_DATA_CHANGES into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM AHS_S_DATA_CHANGES
*  INTO TABLE @DATA(IT_AHS_S_DATA_CHANGES2).
*--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_AHS_S_DATA_CHANGES INDEX 1 INTO DATA(WA_AHS_S_DATA_CHANGES2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<AHS_S_DATA_CHANGES>-PARENT = 1.
<AHS_S_DATA_CHANGES>-NODEID = 1.
<AHS_S_DATA_CHANGES>-IS_LEAF = 1.
<AHS_S_DATA_CHANGES>-IS_CHILD = 1.
<AHS_S_DATA_CHANGES>-IS_RELEVANT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_AHS_S_DATA_CHANGES-CALCSIGN, sy-vline,
  WA_AHS_S_DATA_CHANGES-BAL_ATTR, sy-vline,
  WA_AHS_S_DATA_CHANGES-NODELEVEL, sy-vline,
  WA_AHS_S_DATA_CHANGES-NODETYPE, sy-vline,
  WA_AHS_S_DATA_CHANGES-NODENAME, sy-vline,
  WA_AHS_S_DATA_CHANGES-ERGSL_ASSETS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_AHS_S_DATA_CHANGES 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_AHS_S_DATA_CHANGES 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_AHS_S_DATA_CHANGES INTO WA_AHS_S_DATA_CHANGES.


*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 ANLN1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_AHS_S_DATA_CHANGES-ANLN1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_AHS_S_DATA_CHANGES-ANLN1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ANLN2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_AHS_S_DATA_CHANGES-ANLN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_AHS_S_DATA_CHANGES-ANLN2.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit GJAHR, internal->external for field FYEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_AHS_S_DATA_CHANGES-FYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_AHS_S_DATA_CHANGES-FYEAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC172, internal->external for field BALANCE
CALL FUNCTION 'CONVERSION_EXIT_AC172_OUTPUT'
  EXPORTING
    input =                      WA_AHS_S_DATA_CHANGES-BALANCE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_AHS_S_DATA_CHANGES-BALANCE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KEY_FIGURE_CODE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_AHS_S_DATA_CHANGES-KEY_FIGURE_CODE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_AHS_S_DATA_CHANGES-KEY_FIGURE_CODE.
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_AHS_S_DATA_CHANGES_STR, 
PARENT TYPE STRING,
NODEID TYPE STRING,
IS_LEAF TYPE STRING,
IS_CHILD TYPE STRING,
IS_RELEVANT TYPE STRING,
CALCSIGN TYPE STRING,
BAL_ATTR TYPE STRING,
NODELEVEL TYPE STRING,
NODETYPE TYPE STRING,
NODENAME TYPE STRING,
ERGSL_ASSETS TYPE STRING,
ERGSL_CHNGES TYPE STRING,
VERSN TYPE STRING,
CCODE TYPE STRING,
AFABE TYPE STRING,
ANLN1 TYPE STRING,
ANLN2 TYPE STRING,
ANLKL TYPE STRING,
GITTG TYPE STRING,
FYEAR TYPE STRING,
CURKEY TYPE STRING,
BALANCE TYPE STRING,
NS TYPE STRING,
NODETAG TYPE STRING,
NODELABEL TYPE STRING,
GITTG_TEXT TYPE STRING,
KEYFIG_TEXT TYPE STRING,
KEYFIG TYPE STRING,
MANDT TYPE STRING,
KEY_FIGURE_CODE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_AHS_S_DATA_CHANGES_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_AHS_S_DATA_CHANGES_STR-PARENT sy-vline 
WA_AHS_S_DATA_CHANGES_STR-NODEID sy-vline 
WA_AHS_S_DATA_CHANGES_STR-IS_LEAF sy-vline 
WA_AHS_S_DATA_CHANGES_STR-IS_CHILD sy-vline 
WA_AHS_S_DATA_CHANGES_STR-IS_RELEVANT sy-vline 
WA_AHS_S_DATA_CHANGES_STR-CALCSIGN sy-vline 
WA_AHS_S_DATA_CHANGES_STR-BAL_ATTR sy-vline 
WA_AHS_S_DATA_CHANGES_STR-NODELEVEL sy-vline 
WA_AHS_S_DATA_CHANGES_STR-NODETYPE sy-vline 
WA_AHS_S_DATA_CHANGES_STR-NODENAME sy-vline 
WA_AHS_S_DATA_CHANGES_STR-ERGSL_ASSETS sy-vline 
WA_AHS_S_DATA_CHANGES_STR-ERGSL_CHNGES sy-vline 
WA_AHS_S_DATA_CHANGES_STR-VERSN sy-vline 
WA_AHS_S_DATA_CHANGES_STR-CCODE sy-vline 
WA_AHS_S_DATA_CHANGES_STR-AFABE sy-vline 
WA_AHS_S_DATA_CHANGES_STR-ANLN1 sy-vline 
WA_AHS_S_DATA_CHANGES_STR-ANLN2 sy-vline 
WA_AHS_S_DATA_CHANGES_STR-ANLKL sy-vline 
WA_AHS_S_DATA_CHANGES_STR-GITTG sy-vline 
WA_AHS_S_DATA_CHANGES_STR-FYEAR sy-vline 
WA_AHS_S_DATA_CHANGES_STR-CURKEY sy-vline 
WA_AHS_S_DATA_CHANGES_STR-BALANCE sy-vline 
WA_AHS_S_DATA_CHANGES_STR-NS sy-vline 
WA_AHS_S_DATA_CHANGES_STR-NODETAG sy-vline 
WA_AHS_S_DATA_CHANGES_STR-NODELABEL sy-vline 
WA_AHS_S_DATA_CHANGES_STR-GITTG_TEXT sy-vline 
WA_AHS_S_DATA_CHANGES_STR-KEYFIG_TEXT sy-vline 
WA_AHS_S_DATA_CHANGES_STR-KEYFIG sy-vline 
WA_AHS_S_DATA_CHANGES_STR-MANDT sy-vline 
WA_AHS_S_DATA_CHANGES_STR-KEY_FIGURE_CODE sy-vline      INTO ld_text SEPARATED BY SPACE.

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