ABAP Select data from SAP table RNWCHBGZ into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNWCHBGZ
*  INTO TABLE @DATA(IT_RNWCHBGZ2).
*--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_RNWCHBGZ INDEX 1 INTO DATA(WA_RNWCHBGZ2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNWCHBGZ>-MANDT = 1.
<RNWCHBGZ>-EINRI = 1.
<RNWCHBGZ>-FALNR = 1.
<RNWCHBGZ>-LFDNR = 1.
<RNWCHBGZ>-GPART = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNWCHBGZ-PNAME, sy-vline,
  WA_RNWCHBGZ-ROLTP, sy-vline,
  WA_RNWCHBGZ-ROLBZ, sy-vline,
  WA_RNWCHBGZ-MARK, sy-vline,
  WA_RNWCHBGZ-MODUS, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_RNWCHBGZ 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_RNWCHBGZ 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_RNWCHBGZ INTO WA_RNWCHBGZ.


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

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

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

*Conversion exit ALPHA, internal->external for field ROLTP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNWCHBGZ-ROLTP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNWCHBGZ-ROLTP.
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_RNWCHBGZ_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
FALNR TYPE STRING,
LFDNR TYPE STRING,
GPART TYPE STRING,
PNAME TYPE STRING,
ROLTP TYPE STRING,
ROLBZ TYPE STRING,
MARK TYPE STRING,
MODUS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNWCHBGZ_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_RNWCHBGZ_STR-MANDT sy-vline 
WA_RNWCHBGZ_STR-EINRI sy-vline 
WA_RNWCHBGZ_STR-FALNR sy-vline 
WA_RNWCHBGZ_STR-LFDNR sy-vline 
WA_RNWCHBGZ_STR-GPART sy-vline 
WA_RNWCHBGZ_STR-PNAME sy-vline 
WA_RNWCHBGZ_STR-ROLTP sy-vline 
WA_RNWCHBGZ_STR-ROLBZ sy-vline 
WA_RNWCHBGZ_STR-MARK sy-vline 
WA_RNWCHBGZ_STR-MODUS sy-vline      INTO ld_text SEPARATED BY SPACE.

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