ABAP Select data from SAP table RNWCH70 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNWCH70 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 RNWCH70. 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 RNWCH70 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_RNWCH70 TYPE STANDARD TABLE OF RNWCH70,
      WA_RNWCH70 TYPE RNWCH70,
      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: <RNWCH70> TYPE RNWCH70.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNWCH70.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNWCH70
  INTO TABLE IT_RNWCH70.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNWCH70
*  INTO TABLE @DATA(IT_RNWCH702).
*--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_RNWCH70 INDEX 1 INTO DATA(WA_RNWCH702).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNWCH70 ASSIGNING <RNWCH70>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNWCH70>-EINRI = 1.
<RNWCH70>-FALNR = 1.
<RNWCH70>-KOSTR = 1.
<RNWCH70>-LFDVV = 1.
<RNWCH70>-LFDNR = 1.

ENDLOOP.

LOOP AT IT_RNWCH70 INTO WA_RNWCH70.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNWCH70-STATUS, sy-vline,
  WA_RNWCH70-KOGU_ART, sy-vline,
  WA_RNWCH70-BESTAET_NR, sy-vline,
  WA_RNWCH70-BESTAET_DAT, sy-vline,
  WA_RNWCH70-ANFRNR, sy-vline,
  WA_RNWCH70-FOLGNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNWCH70 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_RNWCH70 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_RNWCH70 INTO WA_RNWCH70.


*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_RNWCH70-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNWCH70-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNWCH70-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNWCH70-FALNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KOSTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNWCH70-KOSTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNWCH70-KOSTR.
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_RNWCH70_STR, 
EINRI TYPE STRING,
FALNR TYPE STRING,
KOSTR TYPE STRING,
LFDVV TYPE STRING,
LFDNR TYPE STRING,
STATUS TYPE STRING,
KOGU_ART TYPE STRING,
BESTAET_NR TYPE STRING,
BESTAET_DAT TYPE STRING,
ANFRNR TYPE STRING,
FOLGNR TYPE STRING,
ANTW_CODE TYPE STRING,
GARANT_BTRG TYPE STRING,
WAERS TYPE STRING,
GARANT_QLF TYPE STRING,
PROZ_SATZ TYPE STRING,
SELB_PAT TYPE STRING,
GARANT_BEGD TYPE STRING,
GARANT_ENDD TYPE STRING,
GARANT_TAGE TYPE STRING,
AERZT_LEIST TYPE STRING,
HOTEL_PFLEGE TYPE STRING,
KLASSE TYPE STRING,
LEI_TO_VERSTR TYPE STRING,
BEMERK TYPE STRING,
BEMERKF TYPE STRING,
PBBEMERK TYPE STRING,
RUECKW_BEGR TYPE STRING,
RUECKW_FREITXT TYPE STRING,
RUECKW_FREITXTF TYPE STRING,
PBRUECKW_FREITXT TYPE STRING,
ERDAT TYPE STRING,
ERUSR TYPE STRING,
UPDAT TYPE STRING,
UPUSR TYPE STRING,
STUSR TYPE STRING,
STDAT TYPE STRING,
VRLNG TYPE STRING,
REF_ANFRNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNWCH70_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_RNWCH70_STR-EINRI sy-vline 
WA_RNWCH70_STR-FALNR sy-vline 
WA_RNWCH70_STR-KOSTR sy-vline 
WA_RNWCH70_STR-LFDVV sy-vline 
WA_RNWCH70_STR-LFDNR sy-vline 
WA_RNWCH70_STR-STATUS sy-vline 
WA_RNWCH70_STR-KOGU_ART sy-vline 
WA_RNWCH70_STR-BESTAET_NR sy-vline 
WA_RNWCH70_STR-BESTAET_DAT sy-vline 
WA_RNWCH70_STR-ANFRNR sy-vline 
WA_RNWCH70_STR-FOLGNR sy-vline 
WA_RNWCH70_STR-ANTW_CODE sy-vline 
WA_RNWCH70_STR-GARANT_BTRG sy-vline 
WA_RNWCH70_STR-WAERS sy-vline 
WA_RNWCH70_STR-GARANT_QLF sy-vline 
WA_RNWCH70_STR-PROZ_SATZ sy-vline 
WA_RNWCH70_STR-SELB_PAT sy-vline 
WA_RNWCH70_STR-GARANT_BEGD sy-vline 
WA_RNWCH70_STR-GARANT_ENDD sy-vline 
WA_RNWCH70_STR-GARANT_TAGE sy-vline 
WA_RNWCH70_STR-AERZT_LEIST sy-vline 
WA_RNWCH70_STR-HOTEL_PFLEGE sy-vline 
WA_RNWCH70_STR-KLASSE sy-vline 
WA_RNWCH70_STR-LEI_TO_VERSTR sy-vline 
WA_RNWCH70_STR-BEMERK sy-vline 
WA_RNWCH70_STR-BEMERKF sy-vline 
WA_RNWCH70_STR-PBBEMERK sy-vline 
WA_RNWCH70_STR-RUECKW_BEGR sy-vline 
WA_RNWCH70_STR-RUECKW_FREITXT sy-vline 
WA_RNWCH70_STR-RUECKW_FREITXTF sy-vline 
WA_RNWCH70_STR-PBRUECKW_FREITXT sy-vline 
WA_RNWCH70_STR-ERDAT sy-vline 
WA_RNWCH70_STR-ERUSR sy-vline 
WA_RNWCH70_STR-UPDAT sy-vline 
WA_RNWCH70_STR-UPUSR sy-vline 
WA_RNWCH70_STR-STUSR sy-vline 
WA_RNWCH70_STR-STDAT sy-vline 
WA_RNWCH70_STR-VRLNG sy-vline 
WA_RNWCH70_STR-REF_ANFRNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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