ABAP Select data from SAP table RNWCHVBAP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNWCHVBAP
*  INTO TABLE @DATA(IT_RNWCHVBAP2).
*--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_RNWCHVBAP INDEX 1 INTO DATA(WA_RNWCHVBAP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNWCHVBAP>-NWCH_LEIST = 1.
<RNWCHVBAP>-NWCH_TARIF = 1.
<RNWCHVBAP>-NWCH_LEVON = 1.
<RNWCHVBAP>-NWCH_BEGZT = 1.
<RNWCHVBAP>-NWCH_MENGE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNWCHVBAP-NWCH_ANFOE, sy-vline,
  WA_RNWCHVBAP-NWCH_ANPOE, sy-vline,
  WA_RNWCHVBAP-NWCH_ERBOE, sy-vline,
  WA_RNWCHVBAP-NWCH_LEITX, sy-vline,
  WA_RNWCHVBAP-NWCH_HCOKZ, sy-vline,
  WA_RNWCHVBAP-NWCH_ABRKZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNWCHVBAP 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_RNWCHVBAP 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_RNWCHVBAP INTO WA_RNWCHVBAP.


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

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

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

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

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field NWCH_ISHUSER0
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNWCHVBAP-NWCH_ISHUSER0
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNWCHVBAP-NWCH_ISHUSER0.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field NWCH_ISHUSER1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNWCHVBAP-NWCH_ISHUSER1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNWCHVBAP-NWCH_ISHUSER1.
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_RNWCHVBAP_STR, 
NWCH_LEIST TYPE STRING,
NWCH_TARIF TYPE STRING,
NWCH_LEVON TYPE STRING,
NWCH_BEGZT TYPE STRING,
NWCH_MENGE TYPE STRING,
NWCH_ANFOE TYPE STRING,
NWCH_ANPOE TYPE STRING,
NWCH_ERBOE TYPE STRING,
NWCH_LEITX TYPE STRING,
NWCH_HCOKZ TYPE STRING,
NWCH_ABRKZ TYPE STRING,
NWCH_STORN TYPE STRING,
NWCH_STGRD TYPE STRING,
NWCH_TBTRAG TYPE STRING,
NWCH_LNRLS TYPE STRING,
NWCH_GPART TYPE STRING,
NWCH_ROLTP TYPE STRING,
NWCH_CASETY TYPE STRING,
NWCH_HONART TYPE STRING,
NWCH_HONUGR TYPE STRING,
NWCH_AUFTCDE TYPE STRING,
NWCH_UBLKZ TYPE STRING,
NWCH_UAEKZ TYPE STRING,
NWCH_REMRK TYPE STRING,
NWCH_REMRKF TYPE STRING,
NWCH_UBDAT_EA TYPE STRING,
NWCH_UBLKZ_EA TYPE STRING,
NWCH_UMENG_EA TYPE STRING,
NWCH_UAEKZ_EA TYPE STRING,
NWCH_ISHABART TYPE STRING,
NWCH_ISHGPRS TYPE STRING,
NWCH_ISHTARSP TYPE STRING,
NWCH_ISHPWERT TYPE STRING,
NWCH_ISHPZAHL TYPE STRING,
NWCH_ISHUSER0 TYPE STRING,
NWCH_ISHUSER1 TYPE STRING,
NWCH_ISHPKTKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNWCHVBAP_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_RNWCHVBAP_STR-NWCH_LEIST sy-vline 
WA_RNWCHVBAP_STR-NWCH_TARIF sy-vline 
WA_RNWCHVBAP_STR-NWCH_LEVON sy-vline 
WA_RNWCHVBAP_STR-NWCH_BEGZT sy-vline 
WA_RNWCHVBAP_STR-NWCH_MENGE sy-vline 
WA_RNWCHVBAP_STR-NWCH_ANFOE sy-vline 
WA_RNWCHVBAP_STR-NWCH_ANPOE sy-vline 
WA_RNWCHVBAP_STR-NWCH_ERBOE sy-vline 
WA_RNWCHVBAP_STR-NWCH_LEITX sy-vline 
WA_RNWCHVBAP_STR-NWCH_HCOKZ sy-vline 
WA_RNWCHVBAP_STR-NWCH_ABRKZ sy-vline 
WA_RNWCHVBAP_STR-NWCH_STORN sy-vline 
WA_RNWCHVBAP_STR-NWCH_STGRD sy-vline 
WA_RNWCHVBAP_STR-NWCH_TBTRAG sy-vline 
WA_RNWCHVBAP_STR-NWCH_LNRLS sy-vline 
WA_RNWCHVBAP_STR-NWCH_GPART sy-vline 
WA_RNWCHVBAP_STR-NWCH_ROLTP sy-vline 
WA_RNWCHVBAP_STR-NWCH_CASETY sy-vline 
WA_RNWCHVBAP_STR-NWCH_HONART sy-vline 
WA_RNWCHVBAP_STR-NWCH_HONUGR sy-vline 
WA_RNWCHVBAP_STR-NWCH_AUFTCDE sy-vline 
WA_RNWCHVBAP_STR-NWCH_UBLKZ sy-vline 
WA_RNWCHVBAP_STR-NWCH_UAEKZ sy-vline 
WA_RNWCHVBAP_STR-NWCH_REMRK sy-vline 
WA_RNWCHVBAP_STR-NWCH_REMRKF sy-vline 
WA_RNWCHVBAP_STR-NWCH_UBDAT_EA sy-vline 
WA_RNWCHVBAP_STR-NWCH_UBLKZ_EA sy-vline 
WA_RNWCHVBAP_STR-NWCH_UMENG_EA sy-vline 
WA_RNWCHVBAP_STR-NWCH_UAEKZ_EA sy-vline 
WA_RNWCHVBAP_STR-NWCH_ISHABART sy-vline 
WA_RNWCHVBAP_STR-NWCH_ISHGPRS sy-vline 
WA_RNWCHVBAP_STR-NWCH_ISHTARSP sy-vline 
WA_RNWCHVBAP_STR-NWCH_ISHPWERT sy-vline 
WA_RNWCHVBAP_STR-NWCH_ISHPZAHL sy-vline 
WA_RNWCHVBAP_STR-NWCH_ISHUSER0 sy-vline 
WA_RNWCHVBAP_STR-NWCH_ISHUSER1 sy-vline 
WA_RNWCHVBAP_STR-NWCH_ISHPKTKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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