ABAP Select data from SAP table ISH_RNFDIA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ISH_RNFDIA
*  INTO TABLE @DATA(IT_ISH_RNFDIA2).
*--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_ISH_RNFDIA INDEX 1 INTO DATA(WA_ISH_RNFDIA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ISH_RNFDIA>-DKAT = 1.
<ISH_RNFDIA>-DKEY = 1.
<ISH_RNFDIA>-DIKTXT = 1.
<ISH_RNFDIA>-DIKTX2 = 1.
<ISH_RNFDIA>-DTYP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ISH_RNFDIA-DKAT2, sy-vline,
  WA_ISH_RNFDIA-DKEY2, sy-vline,
  WA_ISH_RNFDIA-RDKAT, sy-vline,
  WA_ISH_RNFDIA-RDKEY, sy-vline,
  WA_ISH_RNFDIA-RDIKTXT, sy-vline,
  WA_ISH_RNFDIA-RDIKTX2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ISH_RNFDIA 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_ISH_RNFDIA 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_ISH_RNFDIA INTO WA_ISH_RNFDIA.


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

*Conversion exit ALPHA, internal->external for field DIAGW
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ISH_RNFDIA-DIAGW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISH_RNFDIA-DIAGW.
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_ISH_RNFDIA_STR, 
DKAT TYPE STRING,
DKEY TYPE STRING,
DIKTXT TYPE STRING,
DIKTX2 TYPE STRING,
DTYP TYPE STRING,
DKAT2 TYPE STRING,
DKEY2 TYPE STRING,
RDKAT TYPE STRING,
RDKEY TYPE STRING,
RDIKTXT TYPE STRING,
RDIKTX2 TYPE STRING,
RDTYP TYPE STRING,
DITXT TYPE STRING,
DILTX TYPE STRING,
DIALO TYPE STRING,
DIAGW TYPE STRING,
DRG_CATEGORY TYPE STRING,
DRG_CC TYPE STRING,
DRG_RELVANT TYPE STRING,
CCL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ISH_RNFDIA_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_ISH_RNFDIA_STR-DKAT sy-vline 
WA_ISH_RNFDIA_STR-DKEY sy-vline 
WA_ISH_RNFDIA_STR-DIKTXT sy-vline 
WA_ISH_RNFDIA_STR-DIKTX2 sy-vline 
WA_ISH_RNFDIA_STR-DTYP sy-vline 
WA_ISH_RNFDIA_STR-DKAT2 sy-vline 
WA_ISH_RNFDIA_STR-DKEY2 sy-vline 
WA_ISH_RNFDIA_STR-RDKAT sy-vline 
WA_ISH_RNFDIA_STR-RDKEY sy-vline 
WA_ISH_RNFDIA_STR-RDIKTXT sy-vline 
WA_ISH_RNFDIA_STR-RDIKTX2 sy-vline 
WA_ISH_RNFDIA_STR-RDTYP sy-vline 
WA_ISH_RNFDIA_STR-DITXT sy-vline 
WA_ISH_RNFDIA_STR-DILTX sy-vline 
WA_ISH_RNFDIA_STR-DIALO sy-vline 
WA_ISH_RNFDIA_STR-DIAGW sy-vline 
WA_ISH_RNFDIA_STR-DRG_CATEGORY sy-vline 
WA_ISH_RNFDIA_STR-DRG_CC sy-vline 
WA_ISH_RNFDIA_STR-DRG_RELVANT sy-vline 
WA_ISH_RNFDIA_STR-CCL sy-vline      INTO ld_text SEPARATED BY SPACE.

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