ABAP Select data from SAP table RNTDCX into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNTDCX 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 RNTDCX. 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 RNTDCX 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_RNTDCX TYPE STANDARD TABLE OF RNTDCX,
      WA_RNTDCX TYPE RNTDCX,
      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: <RNTDCX> TYPE RNTDCX.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNTDCX
*  INTO TABLE @DATA(IT_RNTDCX2).
*--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_RNTDCX INDEX 1 INTO DATA(WA_RNTDCX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNTDCX>-CLIENT = 1.
<RNTDCX>-EINRI = 1.
<RNTDCX>-TARIF = 1.
<RNTDCX>-TALST = 1.
<RNTDCX>-KOSTR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNTDCX-VTRTY, sy-vline,
  WA_RNTDCX-BEGDT, sy-vline,
  WA_RNTDCX-BEGDT_X, sy-vline,
  WA_RNTDCX-ENDDT, sy-vline,
  WA_RNTDCX-KPREIS, sy-vline,
  WA_RNTDCX-KPREIS_X, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNTDCX 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_RNTDCX 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_RNTDCX INTO WA_RNTDCX.


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

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

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

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

*Conversion exit ALPHA, internal->external for field VTRTY
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNTDCX-VTRTY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNTDCX-VTRTY.
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_RNTDCX_STR, 
CLIENT TYPE STRING,
EINRI TYPE STRING,
TARIF TYPE STRING,
TALST TYPE STRING,
KOSTR TYPE STRING,
VTRTY TYPE STRING,
BEGDT TYPE STRING,
BEGDT_X TYPE STRING,
ENDDT TYPE STRING,
KPREIS TYPE STRING,
KPREIS_X TYPE STRING,
KPROZ TYPE STRING,
KPROZ_X TYPE STRING,
WAERS TYPE STRING,
WAERS_X TYPE STRING,
ERDAT TYPE STRING,
ERDAT_X TYPE STRING,
ERUSR TYPE STRING,
ERUSR_X TYPE STRING,
ERTIM TYPE STRING,
ERTIM_X TYPE STRING,
UPDAT TYPE STRING,
UPDAT_X TYPE STRING,
UPUSR TYPE STRING,
UPUSR_X TYPE STRING,
UPTIM TYPE STRING,
UPTIM_X TYPE STRING,
SIGN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNTDCX_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_RNTDCX_STR-CLIENT sy-vline 
WA_RNTDCX_STR-EINRI sy-vline 
WA_RNTDCX_STR-TARIF sy-vline 
WA_RNTDCX_STR-TALST sy-vline 
WA_RNTDCX_STR-KOSTR sy-vline 
WA_RNTDCX_STR-VTRTY sy-vline 
WA_RNTDCX_STR-BEGDT sy-vline 
WA_RNTDCX_STR-BEGDT_X sy-vline 
WA_RNTDCX_STR-ENDDT sy-vline 
WA_RNTDCX_STR-KPREIS sy-vline 
WA_RNTDCX_STR-KPREIS_X sy-vline 
WA_RNTDCX_STR-KPROZ sy-vline 
WA_RNTDCX_STR-KPROZ_X sy-vline 
WA_RNTDCX_STR-WAERS sy-vline 
WA_RNTDCX_STR-WAERS_X sy-vline 
WA_RNTDCX_STR-ERDAT sy-vline 
WA_RNTDCX_STR-ERDAT_X sy-vline 
WA_RNTDCX_STR-ERUSR sy-vline 
WA_RNTDCX_STR-ERUSR_X sy-vline 
WA_RNTDCX_STR-ERTIM sy-vline 
WA_RNTDCX_STR-ERTIM_X sy-vline 
WA_RNTDCX_STR-UPDAT sy-vline 
WA_RNTDCX_STR-UPDAT_X sy-vline 
WA_RNTDCX_STR-UPUSR sy-vline 
WA_RNTDCX_STR-UPUSR_X sy-vline 
WA_RNTDCX_STR-UPTIM sy-vline 
WA_RNTDCX_STR-UPTIM_X sy-vline 
WA_RNTDCX_STR-SIGN sy-vline      INTO ld_text SEPARATED BY SPACE.

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