ABAP Select data from SAP table RCG0FBUF into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RCG0FBUF 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 RCG0FBUF. 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 RCG0FBUF 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_RCG0FBUF TYPE STANDARD TABLE OF RCG0FBUF,
      WA_RCG0FBUF TYPE RCG0FBUF,
      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: <RCG0FBUF> TYPE RCG0FBUF.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RCG0FBUF.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RCG0FBUF
  INTO TABLE IT_RCG0FBUF.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RCG0FBUF
*  INTO TABLE @DATA(IT_RCG0FBUF2).
*--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_RCG0FBUF INDEX 1 INTO DATA(WA_RCG0FBUF2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RCG0FBUF ASSIGNING <RCG0FBUF>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RCG0FBUF>-VALFLG = 1.
<RCG0FBUF>-CHCOFLG = 1.
<RCG0FBUF>-LOCKMOD = 1.
<RCG0FBUF>-LOGLOCKMOD = 1.
<RCG0FBUF>-SAVEMOD = 1.

ENDLOOP.

LOOP AT IT_RCG0FBUF INTO WA_RCG0FBUF.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RCG0FBUF-SPLIT, sy-vline,
  WA_RCG0FBUF-BUF_ORIG_INDEX, sy-vline,
  WA_RCG0FBUF-CHANGENO, sy-vline,
  WA_RCG0FBUF-KEYDATE, sy-vline,
  WA_RCG0FBUF-MANDT, sy-vline,
  WA_RCG0FBUF-RECN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RCG0FBUF 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_RCG0FBUF 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_RCG0FBUF INTO WA_RCG0FBUF.


*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 CHANGENO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCG0FBUF-CHANGENO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCG0FBUF-CHANGENO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RECN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCG0FBUF-RECN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCG0FBUF-RECN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ACTN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCG0FBUF-ACTN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCG0FBUF-ACTN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AENNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCG0FBUF-AENNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCG0FBUF-AENNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field OWNID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCG0FBUF-OWNID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCG0FBUF-OWNID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RECNROOT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCG0FBUF-RECNROOT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCG0FBUF-RECNROOT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RECNTVA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCG0FBUF-RECNTVA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCG0FBUF-RECNTVA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RECNCMP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCG0FBUF-RECNCMP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCG0FBUF-RECNCMP.
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_RCG0FBUF_STR, 
VALFLG TYPE STRING,
CHCOFLG TYPE STRING,
LOCKMOD TYPE STRING,
LOGLOCKMOD TYPE STRING,
SAVEMOD TYPE STRING,
SPLIT TYPE STRING,
BUF_ORIG_INDEX TYPE STRING,
CHANGENO TYPE STRING,
KEYDATE TYPE STRING,
MANDT TYPE STRING,
RECN TYPE STRING,
ACTN TYPE STRING,
VALFR TYPE STRING,
VALTO TYPE STRING,
AENNR TYPE STRING,
DELFLG TYPE STRING,
PARKFLG TYPE STRING,
CRDAT TYPE STRING,
CRNAM TYPE STRING,
UPDDAT TYPE STRING,
UPDNAM TYPE STRING,
SRSID TYPE STRING,
OWNID TYPE STRING,
RECNROOT TYPE STRING,
RECNTVA TYPE STRING,
RECNCMP TYPE STRING,
LWDG TYPE STRING,
DPOT TYPE STRING,
WOS TYPE STRING,
NHM TYPE STRING,
NHME TYPE STRING,
HISCAT TYPE STRING,
UPD_CMP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RCG0FBUF_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_RCG0FBUF_STR-VALFLG sy-vline 
WA_RCG0FBUF_STR-CHCOFLG sy-vline 
WA_RCG0FBUF_STR-LOCKMOD sy-vline 
WA_RCG0FBUF_STR-LOGLOCKMOD sy-vline 
WA_RCG0FBUF_STR-SAVEMOD sy-vline 
WA_RCG0FBUF_STR-SPLIT sy-vline 
WA_RCG0FBUF_STR-BUF_ORIG_INDEX sy-vline 
WA_RCG0FBUF_STR-CHANGENO sy-vline 
WA_RCG0FBUF_STR-KEYDATE sy-vline 
WA_RCG0FBUF_STR-MANDT sy-vline 
WA_RCG0FBUF_STR-RECN sy-vline 
WA_RCG0FBUF_STR-ACTN sy-vline 
WA_RCG0FBUF_STR-VALFR sy-vline 
WA_RCG0FBUF_STR-VALTO sy-vline 
WA_RCG0FBUF_STR-AENNR sy-vline 
WA_RCG0FBUF_STR-DELFLG sy-vline 
WA_RCG0FBUF_STR-PARKFLG sy-vline 
WA_RCG0FBUF_STR-CRDAT sy-vline 
WA_RCG0FBUF_STR-CRNAM sy-vline 
WA_RCG0FBUF_STR-UPDDAT sy-vline 
WA_RCG0FBUF_STR-UPDNAM sy-vline 
WA_RCG0FBUF_STR-SRSID sy-vline 
WA_RCG0FBUF_STR-OWNID sy-vline 
WA_RCG0FBUF_STR-RECNROOT sy-vline 
WA_RCG0FBUF_STR-RECNTVA sy-vline 
WA_RCG0FBUF_STR-RECNCMP sy-vline 
WA_RCG0FBUF_STR-LWDG sy-vline 
WA_RCG0FBUF_STR-DPOT sy-vline 
WA_RCG0FBUF_STR-WOS sy-vline 
WA_RCG0FBUF_STR-NHM sy-vline 
WA_RCG0FBUF_STR-NHME sy-vline 
WA_RCG0FBUF_STR-HISCAT sy-vline 
WA_RCG0FBUF_STR-UPD_CMP sy-vline      INTO ld_text SEPARATED BY SPACE.

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