ABAP Select data from SAP table RKMAH into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RKMAH
*  INTO TABLE @DATA(IT_RKMAH2).
*--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_RKMAH INDEX 1 INTO DATA(WA_RKMAH2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RKMAH>-KOKRS = 1.
<RKMAH>-HNAME = 1.
<RKMAH>-HNAM1 = 1.
<RKMAH>-HNAM2 = 1.
<RKMAH>-HKOST = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RKMAH-HPRNR, sy-vline,
  WA_RKMAH-HSTRG, sy-vline,
  WA_RKMAH-HKSTA, sy-vline,
  WA_RKMAH-HAUFN, sy-vline,
  WA_RKMAH-HLSTA, sy-vline,
  WA_RKMAH-HPOST, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RKMAH 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_RKMAH 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_RKMAH INTO WA_RKMAH.


*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_RKMAH_STR, 
KOKRS TYPE STRING,
HNAME TYPE STRING,
HNAM1 TYPE STRING,
HNAM2 TYPE STRING,
HKOST TYPE STRING,
HPRNR TYPE STRING,
HSTRG TYPE STRING,
HKSTA TYPE STRING,
HAUFN TYPE STRING,
HLSTA TYPE STRING,
HPOST TYPE STRING,
HKONS TYPE STRING,
HSTAG TYPE STRING,
HPSPE TYPE STRING,
HLINE TYPE STRING,
FCODE TYPE STRING,
FROM TYPE STRING,
TO TYPE STRING,
KAMAY TYPE STRING,
KAMAN TYPE STRING,
TITL2 TYPE STRING,
TITLE TYPE STRING,
KTOPL TYPE STRING,
TABLE TYPE STRING,
FELD TYPE STRING,
TEXT1 TYPE STRING,
TEXT2 TYPE STRING,
LINCT TYPE STRING,
FLAG TYPE STRING,
PMFLAG TYPE STRING,
PRTCLASS TYPE STRING,
ZPFLAG TYPE STRING,
SNAME TYPE STRING,
LNAME TYPE STRING,
HPRCT TYPE STRING,
REPWERT TYPE STRING,
FLRPW TYPE STRING,
PPLAN TYPE STRING,
PHIER TYPE STRING,
KGRHI TYPE STRING,
KGRVW TYPE STRING,
MDATF TYPE STRING,
FLINT TYPE STRING,
PRUED TYPE STRING,
SHTXT TYPE STRING,
PRUMD TYPE STRING,
GRPTP TYPE STRING,
LEVEL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RKMAH_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_RKMAH_STR-KOKRS sy-vline 
WA_RKMAH_STR-HNAME sy-vline 
WA_RKMAH_STR-HNAM1 sy-vline 
WA_RKMAH_STR-HNAM2 sy-vline 
WA_RKMAH_STR-HKOST sy-vline 
WA_RKMAH_STR-HPRNR sy-vline 
WA_RKMAH_STR-HSTRG sy-vline 
WA_RKMAH_STR-HKSTA sy-vline 
WA_RKMAH_STR-HAUFN sy-vline 
WA_RKMAH_STR-HLSTA sy-vline 
WA_RKMAH_STR-HPOST sy-vline 
WA_RKMAH_STR-HKONS sy-vline 
WA_RKMAH_STR-HSTAG sy-vline 
WA_RKMAH_STR-HPSPE sy-vline 
WA_RKMAH_STR-HLINE sy-vline 
WA_RKMAH_STR-FCODE sy-vline 
WA_RKMAH_STR-FROM sy-vline 
WA_RKMAH_STR-TO sy-vline 
WA_RKMAH_STR-KAMAY sy-vline 
WA_RKMAH_STR-KAMAN sy-vline 
WA_RKMAH_STR-TITL2 sy-vline 
WA_RKMAH_STR-TITLE sy-vline 
WA_RKMAH_STR-KTOPL sy-vline 
WA_RKMAH_STR-TABLE sy-vline 
WA_RKMAH_STR-FELD sy-vline 
WA_RKMAH_STR-TEXT1 sy-vline 
WA_RKMAH_STR-TEXT2 sy-vline 
WA_RKMAH_STR-LINCT sy-vline 
WA_RKMAH_STR-FLAG sy-vline 
WA_RKMAH_STR-PMFLAG sy-vline 
WA_RKMAH_STR-PRTCLASS sy-vline 
WA_RKMAH_STR-ZPFLAG sy-vline 
WA_RKMAH_STR-SNAME sy-vline 
WA_RKMAH_STR-LNAME sy-vline 
WA_RKMAH_STR-HPRCT sy-vline 
WA_RKMAH_STR-REPWERT sy-vline 
WA_RKMAH_STR-FLRPW sy-vline 
WA_RKMAH_STR-PPLAN sy-vline 
WA_RKMAH_STR-PHIER sy-vline 
WA_RKMAH_STR-KGRHI sy-vline 
WA_RKMAH_STR-KGRVW sy-vline 
WA_RKMAH_STR-MDATF sy-vline 
WA_RKMAH_STR-FLINT sy-vline 
WA_RKMAH_STR-PRUED sy-vline 
WA_RKMAH_STR-SHTXT sy-vline 
WA_RKMAH_STR-PRUMD sy-vline 
WA_RKMAH_STR-GRPTP sy-vline 
WA_RKMAH_STR-LEVEL sy-vline      INTO ld_text SEPARATED BY SPACE.

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