ABAP Select data from SAP table RCGWLBUF 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 RCGWLBUF 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 RCGWLBUF. 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 RCGWLBUF 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_RCGWLBUF TYPE STANDARD TABLE OF RCGWLBUF,
      WA_RCGWLBUF TYPE RCGWLBUF,
      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: <RCGWLBUF> TYPE RCGWLBUF.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RCGWLBUF
*  INTO TABLE @DATA(IT_RCGWLBUF2).
*--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_RCGWLBUF INDEX 1 INTO DATA(WA_RCGWLBUF2).


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

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

ENDLOOP.

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

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


*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_RCGWLBUF-CHANGENO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCGWLBUF-CHANGENO.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RCGWLBUF-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCGWLBUF-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field STLNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_RCGWLBUF-STLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCGWLBUF-STLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field STLAL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCGWLBUF-STLAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCGWLBUF-STLAL.
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_RCGWLBUF_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,
STLTY TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
STLNR TYPE STRING,
STLAL TYPE STRING,
STLAN TYPE STRING,
STKOZ TYPE STRING,
CRTIME TYPE STRING,
UPDTIME TYPE STRING,
ERRMODE TYPE STRING,
RFCDEST TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RCGWLBUF_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_RCGWLBUF_STR-VALFLG sy-vline 
WA_RCGWLBUF_STR-CHCOFLG sy-vline 
WA_RCGWLBUF_STR-LOCKMOD sy-vline 
WA_RCGWLBUF_STR-LOGLOCKMOD sy-vline 
WA_RCGWLBUF_STR-SAVEMOD sy-vline 
WA_RCGWLBUF_STR-SPLIT sy-vline 
WA_RCGWLBUF_STR-BUF_ORIG_INDEX sy-vline 
WA_RCGWLBUF_STR-CHANGENO sy-vline 
WA_RCGWLBUF_STR-KEYDATE sy-vline 
WA_RCGWLBUF_STR-MANDT sy-vline 
WA_RCGWLBUF_STR-RECN sy-vline 
WA_RCGWLBUF_STR-ACTN sy-vline 
WA_RCGWLBUF_STR-VALFR sy-vline 
WA_RCGWLBUF_STR-VALTO sy-vline 
WA_RCGWLBUF_STR-AENNR sy-vline 
WA_RCGWLBUF_STR-DELFLG sy-vline 
WA_RCGWLBUF_STR-PARKFLG sy-vline 
WA_RCGWLBUF_STR-CRDAT sy-vline 
WA_RCGWLBUF_STR-CRNAM sy-vline 
WA_RCGWLBUF_STR-UPDDAT sy-vline 
WA_RCGWLBUF_STR-UPDNAM sy-vline 
WA_RCGWLBUF_STR-SRSID sy-vline 
WA_RCGWLBUF_STR-OWNID sy-vline 
WA_RCGWLBUF_STR-RECNROOT sy-vline 
WA_RCGWLBUF_STR-STLTY sy-vline 
WA_RCGWLBUF_STR-MATNR sy-vline 
WA_RCGWLBUF_STR-WERKS sy-vline 
WA_RCGWLBUF_STR-STLNR sy-vline 
WA_RCGWLBUF_STR-STLAL sy-vline 
WA_RCGWLBUF_STR-STLAN sy-vline 
WA_RCGWLBUF_STR-STKOZ sy-vline 
WA_RCGWLBUF_STR-CRTIME sy-vline 
WA_RCGWLBUF_STR-UPDTIME sy-vline 
WA_RCGWLBUF_STR-ERRMODE sy-vline 
WA_RCGWLBUF_STR-RFCDEST sy-vline      INTO ld_text SEPARATED BY SPACE.

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