ABAP Select data from SAP table RNWCHEA01 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNWCHEA01 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 RNWCHEA01. 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 RNWCHEA01 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_RNWCHEA01 TYPE STANDARD TABLE OF RNWCHEA01,
      WA_RNWCHEA01 TYPE RNWCHEA01,
      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: <RNWCHEA01> TYPE RNWCHEA01.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNWCHEA01.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNWCHEA01
  INTO TABLE IT_RNWCHEA01.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNWCHEA01
*  INTO TABLE @DATA(IT_RNWCHEA012).
*--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_RNWCHEA01 INDEX 1 INTO DATA(WA_RNWCHEA012).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNWCHEA01 ASSIGNING <RNWCHEA01>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNWCHEA01>-MANDT = 1.
<RNWCHEA01>-GPART = 1.
<RNWCHEA01>-EINRI = 1.
<RNWCHEA01>-EINRI1 = 1.
<RNWCHEA01>-EINRI2 = 1.

ENDLOOP.

LOOP AT IT_RNWCHEA01 INTO WA_RNWCHEA01.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNWCHEA01-NAME1, sy-vline,
  WA_RNWCHEA01-NAM1S, sy-vline,
  WA_RNWCHEA01-NAME2, sy-vline,
  WA_RNWCHEA01-NAM2S, sy-vline,
  WA_RNWCHEA01-NAME3, sy-vline,
  WA_RNWCHEA01-KNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNWCHEA01 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_RNWCHEA01 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_RNWCHEA01 INTO WA_RNWCHEA01.


*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 GPART
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNWCHEA01-GPART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNWCHEA01-GPART.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNWCHEA01-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNWCHEA01-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EINRI1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNWCHEA01-EINRI1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNWCHEA01-EINRI1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EINRI2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNWCHEA01-EINRI2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNWCHEA01-EINRI2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_RNWCHEA01-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNWCHEA01-SPRAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field DEBIT2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNWCHEA01-DEBIT2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNWCHEA01-DEBIT2.
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_RNWCHEA01_STR, 
MANDT TYPE STRING,
GPART TYPE STRING,
EINRI TYPE STRING,
EINRI1 TYPE STRING,
EINRI2 TYPE STRING,
NAME1 TYPE STRING,
NAM1S TYPE STRING,
NAME2 TYPE STRING,
NAM2S TYPE STRING,
NAME3 TYPE STRING,
KNAME TYPE STRING,
NPKZ TYPE STRING,
SPRAS TYPE STRING,
ANREDE TYPE STRING,
TITEL TYPE STRING,
LAND TYPE STRING,
REGIO TYPE STRING,
PSTLZ TYPE STRING,
GEBIE TYPE STRING,
ORT TYPE STRING,
ORTS TYPE STRING,
ORT2 TYPE STRING,
STRAS TYPE STRING,
TELFN TYPE STRING,
DEBIT2 TYPE STRING,
GBDAT TYPE STRING,
GSCHL TYPE STRING,
KZTXT TYPE STRING,
ERDAT TYPE STRING,
ERUSR TYPE STRING,
UPDAT TYPE STRING,
UPUSR TYPE STRING,
AUFGEBGRP TYPE STRING,
BEARBGEB TYPE STRING,
FAKTEINZ TYPE STRING,
FAKTSAMM TYPE STRING,
FAKTBEID TYPE STRING,
RDRUCK TYPE STRING,
PERFK TYPE STRING,
PNUMB TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNWCHEA01_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_RNWCHEA01_STR-MANDT sy-vline 
WA_RNWCHEA01_STR-GPART sy-vline 
WA_RNWCHEA01_STR-EINRI sy-vline 
WA_RNWCHEA01_STR-EINRI1 sy-vline 
WA_RNWCHEA01_STR-EINRI2 sy-vline 
WA_RNWCHEA01_STR-NAME1 sy-vline 
WA_RNWCHEA01_STR-NAM1S sy-vline 
WA_RNWCHEA01_STR-NAME2 sy-vline 
WA_RNWCHEA01_STR-NAM2S sy-vline 
WA_RNWCHEA01_STR-NAME3 sy-vline 
WA_RNWCHEA01_STR-KNAME sy-vline 
WA_RNWCHEA01_STR-NPKZ sy-vline 
WA_RNWCHEA01_STR-SPRAS sy-vline 
WA_RNWCHEA01_STR-ANREDE sy-vline 
WA_RNWCHEA01_STR-TITEL sy-vline 
WA_RNWCHEA01_STR-LAND sy-vline 
WA_RNWCHEA01_STR-REGIO sy-vline 
WA_RNWCHEA01_STR-PSTLZ sy-vline 
WA_RNWCHEA01_STR-GEBIE sy-vline 
WA_RNWCHEA01_STR-ORT sy-vline 
WA_RNWCHEA01_STR-ORTS sy-vline 
WA_RNWCHEA01_STR-ORT2 sy-vline 
WA_RNWCHEA01_STR-STRAS sy-vline 
WA_RNWCHEA01_STR-TELFN sy-vline 
WA_RNWCHEA01_STR-DEBIT2 sy-vline 
WA_RNWCHEA01_STR-GBDAT sy-vline 
WA_RNWCHEA01_STR-GSCHL sy-vline 
WA_RNWCHEA01_STR-KZTXT sy-vline 
WA_RNWCHEA01_STR-ERDAT sy-vline 
WA_RNWCHEA01_STR-ERUSR sy-vline 
WA_RNWCHEA01_STR-UPDAT sy-vline 
WA_RNWCHEA01_STR-UPUSR sy-vline 
WA_RNWCHEA01_STR-AUFGEBGRP sy-vline 
WA_RNWCHEA01_STR-BEARBGEB sy-vline 
WA_RNWCHEA01_STR-FAKTEINZ sy-vline 
WA_RNWCHEA01_STR-FAKTSAMM sy-vline 
WA_RNWCHEA01_STR-FAKTBEID sy-vline 
WA_RNWCHEA01_STR-RDRUCK sy-vline 
WA_RNWCHEA01_STR-PERFK sy-vline 
WA_RNWCHEA01_STR-PNUMB sy-vline      INTO ld_text SEPARATED BY SPACE.

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