ABAP Select data from SAP table RVCNUMVB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RVCNUMVB
*  INTO TABLE @DATA(IT_RVCNUMVB2).
*--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_RVCNUMVB INDEX 1 INTO DATA(WA_RVCNUMVB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RVCNUMVB>-MANDT = 1.
<RVCNUMVB>-CCINS = 1.
<RVCNUMVB>-CCNUM = 1.
<RVCNUMVB>-CCNAME = 1.
<RVCNUMVB>-DATAB = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RVCNUMVB-DATBI, sy-vline,
  WA_RVCNUMVB-CCTYP, sy-vline,
  WA_RVCNUMVB-CCLOCK, sy-vline,
  WA_RVCNUMVB-ISSBANK, sy-vline,
  WA_RVCNUMVB-AUSGDAT, sy-vline,
  WA_RVCNUMVB-CCNUM_MASK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RVCNUMVB 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_RVCNUMVB 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_RVCNUMVB INTO WA_RVCNUMVB.


*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_RVCNUMVB_STR, 
MANDT TYPE STRING,
CCINS TYPE STRING,
CCNUM TYPE STRING,
CCNAME TYPE STRING,
DATAB TYPE STRING,
DATBI TYPE STRING,
CCTYP TYPE STRING,
CCLOCK TYPE STRING,
ISSBANK TYPE STRING,
AUSGDAT TYPE STRING,
CCNUM_MASK TYPE STRING,
CCARD_GUID TYPE STRING,
CCARD_ID TYPE STRING,
CCACCNAME TYPE STRING,
DBCODE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RVCNUMVB_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_RVCNUMVB_STR-MANDT sy-vline 
WA_RVCNUMVB_STR-CCINS sy-vline 
WA_RVCNUMVB_STR-CCNUM sy-vline 
WA_RVCNUMVB_STR-CCNAME sy-vline 
WA_RVCNUMVB_STR-DATAB sy-vline 
WA_RVCNUMVB_STR-DATBI sy-vline 
WA_RVCNUMVB_STR-CCTYP sy-vline 
WA_RVCNUMVB_STR-CCLOCK sy-vline 
WA_RVCNUMVB_STR-ISSBANK sy-vline 
WA_RVCNUMVB_STR-AUSGDAT sy-vline 
WA_RVCNUMVB_STR-CCNUM_MASK sy-vline 
WA_RVCNUMVB_STR-CCARD_GUID sy-vline 
WA_RVCNUMVB_STR-CCARD_ID sy-vline 
WA_RVCNUMVB_STR-CCACCNAME sy-vline 
WA_RVCNUMVB_STR-DBCODE sy-vline      INTO ld_text SEPARATED BY SPACE.

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