ABAP Select data from SAP table RKMA2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RKMA2 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 RKMA2. 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 RKMA2 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_RKMA2 TYPE STANDARD TABLE OF RKMA2,
      WA_RKMA2 TYPE RKMA2,
      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: <RKMA2> TYPE RKMA2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RKMA2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RKMA2
  INTO TABLE IT_RKMA2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RKMA2
*  INTO TABLE @DATA(IT_RKMA22).
*--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_RKMA2 INDEX 1 INTO DATA(WA_RKMA22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RKMA2 ASSIGNING <RKMA2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RKMA2>-AOBCT = 1.
<RKMA2>-BOBCT = 1.
<RKMA2>-OBBEZ = 1.
<RKMA2>-OBKRS = 1.
<RKMA2>-OBIDN = 1.

ENDLOOP.

LOOP AT IT_RKMA2 INTO WA_RKMA2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RKMA2-OBADT, sy-vline,
  WA_RKMA2-OBBDT, sy-vline,
  WA_RKMA2-OBTXT, sy-vline,
  WA_RKMA2-OBTYP, sy-vline,
  WA_RKMA2-OBVER, sy-vline,
  WA_RKMA2-ACPGE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RKMA2 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_RKMA2 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_RKMA2 INTO WA_RKMA2.


*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 AOBCT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RKMA2-AOBCT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKMA2-AOBCT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BOBCT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RKMA2-BOBCT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKMA2-BOBCT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field OBIDN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RKMA2-OBIDN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKMA2-OBIDN.
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_RKMA2_STR, 
AOBCT TYPE STRING,
BOBCT TYPE STRING,
OBBEZ TYPE STRING,
OBKRS TYPE STRING,
OBIDN TYPE STRING,
OBADT TYPE STRING,
OBBDT TYPE STRING,
OBTXT TYPE STRING,
OBTYP TYPE STRING,
OBVER TYPE STRING,
ACPGE TYPE STRING,
NMPGE TYPE STRING,
DATAB TYPE STRING,
DATBI TYPE STRING,
TXT01 TYPE STRING,
TXT02 TYPE STRING,
TXT03 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RKMA2_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_RKMA2_STR-AOBCT sy-vline 
WA_RKMA2_STR-BOBCT sy-vline 
WA_RKMA2_STR-OBBEZ sy-vline 
WA_RKMA2_STR-OBKRS sy-vline 
WA_RKMA2_STR-OBIDN sy-vline 
WA_RKMA2_STR-OBADT sy-vline 
WA_RKMA2_STR-OBBDT sy-vline 
WA_RKMA2_STR-OBTXT sy-vline 
WA_RKMA2_STR-OBTYP sy-vline 
WA_RKMA2_STR-OBVER sy-vline 
WA_RKMA2_STR-ACPGE sy-vline 
WA_RKMA2_STR-NMPGE sy-vline 
WA_RKMA2_STR-DATAB sy-vline 
WA_RKMA2_STR-DATBI sy-vline 
WA_RKMA2_STR-TXT01 sy-vline 
WA_RKMA2_STR-TXT02 sy-vline 
WA_RKMA2_STR-TXT03 sy-vline      INTO ld_text SEPARATED BY SPACE.

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