ABAP Select data from SAP table RCGWHITMS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RCGWHITMS
*  INTO TABLE @DATA(IT_RCGWHITMS2).
*--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_RCGWHITMS INDEX 1 INTO DATA(WA_RCGWHITMS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RCGWHITMS>-MANDT = 1.
<RCGWHITMS>-GENPC = 1.
<RCGWHITMS>-PCACTIVE = 1.
<RCGWHITMS>-BTCH_STATE = 1.
<RCGWHITMS>-RECN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RCGWHITMS-GENPRIO, sy-vline,
  WA_RCGWHITMS-TRGDOKAR, sy-vline,
  WA_RCGWHITMS-TRGDOKNR, sy-vline,
  WA_RCGWHITMS-TRGDOKVR, sy-vline,
  WA_RCGWHITMS-TRGDOKTL, sy-vline,
  WA_RCGWHITMS-STATUS_TEXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RCGWHITMS 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_RCGWHITMS 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_RCGWHITMS INTO WA_RCGWHITMS.


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

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

*Conversion exit ALPHA, internal->external for field SRCDOKNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCGWHITMS-SRCDOKNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCGWHITMS-SRCDOKNR.
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_RCGWHITMS_STR, 
MANDT TYPE STRING,
GENPC TYPE STRING,
PCACTIVE TYPE STRING,
BTCH_STATE TYPE STRING,
RECN TYPE STRING,
GENPRIO TYPE STRING,
TRGDOKAR TYPE STRING,
TRGDOKNR TYPE STRING,
TRGDOKVR TYPE STRING,
TRGDOKTL TYPE STRING,
STATUS_TEXT TYPE STRING,
GENMODE TYPE STRING,
CRNAM TYPE STRING,
SRCDOKAR TYPE STRING,
SRCDOKNR TYPE STRING,
SRCDOKVR TYPE STRING,
SRCDOKTL TYPE STRING,
WWIAPPL1 TYPE STRING,
WWIAPPL2 TYPE STRING,
PRTYPE TYPE STRING,
OHORDERNO TYPE STRING,
OHORDERCNT TYPE STRING,
MARKFLG TYPE STRING,
LINENO TYPE STRING,
STATUS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RCGWHITMS_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_RCGWHITMS_STR-MANDT sy-vline 
WA_RCGWHITMS_STR-GENPC sy-vline 
WA_RCGWHITMS_STR-PCACTIVE sy-vline 
WA_RCGWHITMS_STR-BTCH_STATE sy-vline 
WA_RCGWHITMS_STR-RECN sy-vline 
WA_RCGWHITMS_STR-GENPRIO sy-vline 
WA_RCGWHITMS_STR-TRGDOKAR sy-vline 
WA_RCGWHITMS_STR-TRGDOKNR sy-vline 
WA_RCGWHITMS_STR-TRGDOKVR sy-vline 
WA_RCGWHITMS_STR-TRGDOKTL sy-vline 
WA_RCGWHITMS_STR-STATUS_TEXT sy-vline 
WA_RCGWHITMS_STR-GENMODE sy-vline 
WA_RCGWHITMS_STR-CRNAM sy-vline 
WA_RCGWHITMS_STR-SRCDOKAR sy-vline 
WA_RCGWHITMS_STR-SRCDOKNR sy-vline 
WA_RCGWHITMS_STR-SRCDOKVR sy-vline 
WA_RCGWHITMS_STR-SRCDOKTL sy-vline 
WA_RCGWHITMS_STR-WWIAPPL1 sy-vline 
WA_RCGWHITMS_STR-WWIAPPL2 sy-vline 
WA_RCGWHITMS_STR-PRTYPE sy-vline 
WA_RCGWHITMS_STR-OHORDERNO sy-vline 
WA_RCGWHITMS_STR-OHORDERCNT sy-vline 
WA_RCGWHITMS_STR-MARKFLG sy-vline 
WA_RCGWHITMS_STR-LINENO sy-vline 
WA_RCGWHITMS_STR-STATUS sy-vline      INTO ld_text SEPARATED BY SPACE.

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