ABAP Select data from SAP table RNF01 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNF01 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 RNF01. 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 RNF01 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_RNF01 TYPE STANDARD TABLE OF RNF01,
      WA_RNF01 TYPE RNF01,
      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: <RNF01> TYPE RNF01.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNF01.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNF01
  INTO TABLE IT_RNF01.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNF01
*  INTO TABLE @DATA(IT_RNF012).
*--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_RNF01 INDEX 1 INTO DATA(WA_RNF012).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNF01 ASSIGNING <RNF01>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNF01>-ANREXPAT = 1.
<RNF01>-BIRTHDTPAT = 1.
<RNF01>-BIRTHNMPAT = 1.
<RNF01>-CITYOFPAT = 1.
<RNF01>-CONCATPAT = 1.

ENDLOOP.

LOOP AT IT_RNF01 INTO WA_RNF01.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNF01-FSTNAMEPAT, sy-vline,
  WA_RNF01-NAMEADDPAT, sy-vline,
  WA_RNF01-PATIENTNO, sy-vline,
  WA_RNF01-PHONENOPAT, sy-vline,
  WA_RNF01-POSTCDPAT, sy-vline,
  WA_RNF01-PREFIXPAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNF01 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_RNF01 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_RNF01 INTO WA_RNF01.


*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 PATIENTNO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF01-PATIENTNO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF01-PATIENTNO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RACEOFPAT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF01-RACEOFPAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF01-RACEOFPAT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ADRNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF01-ADRNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF01-ADRNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit SXIDN, internal->external for field EMAIL
CALL FUNCTION 'CONVERSION_EXIT_SXIDN_OUTPUT'
  EXPORTING
    input =                      WA_RNF01-EMAIL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF01-EMAIL.
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_RNF01_STR, 
ANREXPAT TYPE STRING,
BIRTHDTPAT TYPE STRING,
BIRTHNMPAT TYPE STRING,
CITYOFPAT TYPE STRING,
CONCATPAT TYPE STRING,
FSTNAMEPAT TYPE STRING,
NAMEADDPAT TYPE STRING,
PATIENTNO TYPE STRING,
PHONENOPAT TYPE STRING,
POSTCDPAT TYPE STRING,
PREFIXPAT TYPE STRING,
PSEUDONPAT TYPE STRING,
QUARTERPAT TYPE STRING,
RESLANDPAT TYPE STRING,
RACEOFPAT TYPE STRING,
SEXOFPAT TYPE STRING,
SEXNAMPAT TYPE STRING,
SURNAMEPAT TYPE STRING,
STREETPAT TYPE STRING,
TITELOFPAT TYPE STRING,
MANDT TYPE STRING,
ADRNR TYPE STRING,
ADROB TYPE STRING,
PSTLZ TYPE STRING,
LAND TYPE STRING,
REGIO TYPE STRING,
ORT TYPE STRING,
ORT2 TYPE STRING,
STRAS TYPE STRING,
STRAZ TYPE STRING,
EINZG TYPE STRING,
PSTLP TYPE STRING,
PFACH TYPE STRING,
LANPF TYPE STRING,
ORTPF TYPE STRING,
PSTLF TYPE STRING,
TELNR TYPE STRING,
TELXT TYPE STRING,
FAXNR TYPE STRING,
FAXXT TYPE STRING,
TEXNR TYPE STRING,
BUILD TYPE STRING,
FLOOR TYPE STRING,
ROOM TYPE STRING,
STORT TYPE STRING,
STOTT TYPE STRING,
STSTR TYPE STRING,
STSTZ TYPE STRING,
STORP TYPE STRING,
TELKZ TYPE STRING,
EMAIL TYPE STRING,
USER1 TYPE STRING,
USER2 TYPE STRING,
USER3 TYPE STRING,
USER4 TYPE STRING,
USER5 TYPE STRING,
USER6 TYPE STRING,
ITREG TYPE STRING,
ITREGTXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNF01_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_RNF01_STR-ANREXPAT sy-vline 
WA_RNF01_STR-BIRTHDTPAT sy-vline 
WA_RNF01_STR-BIRTHNMPAT sy-vline 
WA_RNF01_STR-CITYOFPAT sy-vline 
WA_RNF01_STR-CONCATPAT sy-vline 
WA_RNF01_STR-FSTNAMEPAT sy-vline 
WA_RNF01_STR-NAMEADDPAT sy-vline 
WA_RNF01_STR-PATIENTNO sy-vline 
WA_RNF01_STR-PHONENOPAT sy-vline 
WA_RNF01_STR-POSTCDPAT sy-vline 
WA_RNF01_STR-PREFIXPAT sy-vline 
WA_RNF01_STR-PSEUDONPAT sy-vline 
WA_RNF01_STR-QUARTERPAT sy-vline 
WA_RNF01_STR-RESLANDPAT sy-vline 
WA_RNF01_STR-RACEOFPAT sy-vline 
WA_RNF01_STR-SEXOFPAT sy-vline 
WA_RNF01_STR-SEXNAMPAT sy-vline 
WA_RNF01_STR-SURNAMEPAT sy-vline 
WA_RNF01_STR-STREETPAT sy-vline 
WA_RNF01_STR-TITELOFPAT sy-vline 
WA_RNF01_STR-MANDT sy-vline 
WA_RNF01_STR-ADRNR sy-vline 
WA_RNF01_STR-ADROB sy-vline 
WA_RNF01_STR-PSTLZ sy-vline 
WA_RNF01_STR-LAND sy-vline 
WA_RNF01_STR-REGIO sy-vline 
WA_RNF01_STR-ORT sy-vline 
WA_RNF01_STR-ORT2 sy-vline 
WA_RNF01_STR-STRAS sy-vline 
WA_RNF01_STR-STRAZ sy-vline 
WA_RNF01_STR-EINZG sy-vline 
WA_RNF01_STR-PSTLP sy-vline 
WA_RNF01_STR-PFACH sy-vline 
WA_RNF01_STR-LANPF sy-vline 
WA_RNF01_STR-ORTPF sy-vline 
WA_RNF01_STR-PSTLF sy-vline 
WA_RNF01_STR-TELNR sy-vline 
WA_RNF01_STR-TELXT sy-vline 
WA_RNF01_STR-FAXNR sy-vline 
WA_RNF01_STR-FAXXT sy-vline 
WA_RNF01_STR-TEXNR sy-vline 
WA_RNF01_STR-BUILD sy-vline 
WA_RNF01_STR-FLOOR sy-vline 
WA_RNF01_STR-ROOM sy-vline 
WA_RNF01_STR-STORT sy-vline 
WA_RNF01_STR-STOTT sy-vline 
WA_RNF01_STR-STSTR sy-vline 
WA_RNF01_STR-STSTZ sy-vline 
WA_RNF01_STR-STORP sy-vline 
WA_RNF01_STR-TELKZ sy-vline 
WA_RNF01_STR-EMAIL sy-vline 
WA_RNF01_STR-USER1 sy-vline 
WA_RNF01_STR-USER2 sy-vline 
WA_RNF01_STR-USER3 sy-vline 
WA_RNF01_STR-USER4 sy-vline 
WA_RNF01_STR-USER5 sy-vline 
WA_RNF01_STR-USER6 sy-vline 
WA_RNF01_STR-ITREG sy-vline 
WA_RNF01_STR-ITREGTXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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