ABAP Select data from SAP table RCOMH into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RCOMH
*  INTO TABLE @DATA(IT_RCOMH2).
*--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_RCOMH INDEX 1 INTO DATA(WA_RCOMH2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RCOMH>-MANDT = 1.
<RCOMH>-MSID = 1.
<RCOMH>-WERK = 1.
<RCOMH>-MSCLA = 1.
<RCOMH>-TSTKZ = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RCOMH-SEDAT, sy-vline,
  WA_RCOMH-SEUZT, sy-vline,
  WA_RCOMH-SOURCE, sy-vline,
  WA_RCOMH-ERRKZ, sy-vline,
  WA_RCOMH-ARFCIPID, sy-vline,
  WA_RCOMH-ARFCPID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RCOMH 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_RCOMH 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_RCOMH INTO WA_RCOMH.


*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 AUFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCOMH-AUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCOMH-AUFNR.
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_RCOMH_STR, 
MANDT TYPE STRING,
MSID TYPE STRING,
WERK TYPE STRING,
MSCLA TYPE STRING,
TSTKZ TYPE STRING,
SEDAT TYPE STRING,
SEUZT TYPE STRING,
SOURCE TYPE STRING,
ERRKZ TYPE STRING,
ARFCIPID TYPE STRING,
ARFCPID TYPE STRING,
ARFCTIME TYPE STRING,
ARFCTIDCNT TYPE STRING,
SNDALL TYPE STRING,
AUFNR TYPE STRING,
UKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RCOMH_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_RCOMH_STR-MANDT sy-vline 
WA_RCOMH_STR-MSID sy-vline 
WA_RCOMH_STR-WERK sy-vline 
WA_RCOMH_STR-MSCLA sy-vline 
WA_RCOMH_STR-TSTKZ sy-vline 
WA_RCOMH_STR-SEDAT sy-vline 
WA_RCOMH_STR-SEUZT sy-vline 
WA_RCOMH_STR-SOURCE sy-vline 
WA_RCOMH_STR-ERRKZ sy-vline 
WA_RCOMH_STR-ARFCIPID sy-vline 
WA_RCOMH_STR-ARFCPID sy-vline 
WA_RCOMH_STR-ARFCTIME sy-vline 
WA_RCOMH_STR-ARFCTIDCNT sy-vline 
WA_RCOMH_STR-SNDALL sy-vline 
WA_RCOMH_STR-AUFNR sy-vline 
WA_RCOMH_STR-UKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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