ABAP Select data from SAP table RKGA2U_002 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RKGA2U_002 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 RKGA2U_002. 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 RKGA2U_002 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_RKGA2U_002 TYPE STANDARD TABLE OF RKGA2U_002,
      WA_RKGA2U_002 TYPE RKGA2U_002,
      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: <RKGA2U_002> TYPE RKGA2U_002.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RKGA2U_002.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RKGA2U_002
  INTO TABLE IT_RKGA2U_002.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RKGA2U_002
*  INTO TABLE @DATA(IT_RKGA2U_0022).
*--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_RKGA2U_002 INDEX 1 INTO DATA(WA_RKGA2U_0022).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RKGA2U_002 ASSIGNING <RKGA2U_002>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RKGA2U_002>-GJAHR = 1.
<RKGA2U_002>-FROM = 1.
<RKGA2U_002>-TO = 1.
<RKGA2U_002>-BOOK = 1.
<RKGA2U_002>-LIST = 1.

ENDLOOP.

LOOP AT IT_RKGA2U_002 INTO WA_RKGA2U_002.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RKGA2U_002-LISTSING, sy-vline,
  WA_RKGA2U_002-PLDAT, sy-vline,
  WA_RKGA2U_002-KURST, sy-vline,
  WA_RKGA2U_002-ACTIVITY, sy-vline,
  WA_RKGA2U_002-APPL, sy-vline,
  WA_RKGA2U_002-DOCTY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RKGA2U_002 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_RKGA2U_002 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_RKGA2U_002 INTO WA_RKGA2U_002.


*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 GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_RKGA2U_002-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKGA2U_002-GJAHR.
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_RKGA2U_002_STR, 
GJAHR TYPE STRING,
FROM TYPE STRING,
TO TYPE STRING,
BOOK TYPE STRING,
LIST TYPE STRING,
LISTSING TYPE STRING,
PLDAT TYPE STRING,
KURST TYPE STRING,
ACTIVITY TYPE STRING,
APPL TYPE STRING,
DOCTY TYPE STRING,
ANZBP TYPE STRING,
VANZBP TYPE STRING,
VANZSP TYPE STRING,
TEST TYPE STRING,
ERRSWITCH TYPE STRING,
BATCH TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RKGA2U_002_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_RKGA2U_002_STR-GJAHR sy-vline 
WA_RKGA2U_002_STR-FROM sy-vline 
WA_RKGA2U_002_STR-TO sy-vline 
WA_RKGA2U_002_STR-BOOK sy-vline 
WA_RKGA2U_002_STR-LIST sy-vline 
WA_RKGA2U_002_STR-LISTSING sy-vline 
WA_RKGA2U_002_STR-PLDAT sy-vline 
WA_RKGA2U_002_STR-KURST sy-vline 
WA_RKGA2U_002_STR-ACTIVITY sy-vline 
WA_RKGA2U_002_STR-APPL sy-vline 
WA_RKGA2U_002_STR-DOCTY sy-vline 
WA_RKGA2U_002_STR-ANZBP sy-vline 
WA_RKGA2U_002_STR-VANZBP sy-vline 
WA_RKGA2U_002_STR-VANZSP sy-vline 
WA_RKGA2U_002_STR-TEST sy-vline 
WA_RKGA2U_002_STR-ERRSWITCH sy-vline 
WA_RKGA2U_002_STR-BATCH sy-vline      INTO ld_text SEPARATED BY SPACE.

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