ABAP Select data from SAP table RNF54 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNF54 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 RNF54. 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 RNF54 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_RNF54 TYPE STANDARD TABLE OF RNF54,
      WA_RNF54 TYPE RNF54,
      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: <RNF54> TYPE RNF54.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNF54.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNF54
  INTO TABLE IT_RNF54.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNF54
*  INTO TABLE @DATA(IT_RNF542).
*--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_RNF54 INDEX 1 INTO DATA(WA_RNF542).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNF54 ASSIGNING <RNF54>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNF54>-EINRI = 1.
<RNF54>-EDATE = 1.
<RNF54>-ICPMK = 1.
<RNF54>-ICPML = 1.
<RNF54>-OPTAB = 1.

ENDLOOP.

LOOP AT IT_RNF54 INTO WA_RNF54.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNF54-PATNR, sy-vline,
  WA_RNF54-FALNR, sy-vline,
  WA_RNF54-FZIFF, sy-vline,
  WA_RNF54-FALAE, sy-vline,
  WA_RNF54-FALAR, sy-vline,
  WA_RNF54-ICDKT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNF54 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_RNF54 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_RNF54 INTO WA_RNF54.


*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_RNF54-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF54-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ICPMK
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF54-ICPMK
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF54-ICPMK.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ICPML
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF54-ICPML
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF54-ICPML.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PATNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF54-PATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF54-PATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF54-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF54-FALNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field CLASS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF54-CLASS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF54-CLASS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BEKAT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF54-BEKAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF54-BEKAT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ACCCAT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF54-ACCCAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF54-ACCCAT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ORGFA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF54-ORGFA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF54-ORGFA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ORGPF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF54-ORGPF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF54-ORGPF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field CHILDREN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF54-CHILDREN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF54-CHILDREN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BARNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF54-BARNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF54-BARNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PKGTK
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF54-PKGTK
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF54-PKGTK.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PKGLS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF54-PKGLS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF54-PKGLS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PKGSP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF54-PKGSP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF54-PKGSP.
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_RNF54_STR, 
EINRI TYPE STRING,
EDATE TYPE STRING,
ICPMK TYPE STRING,
ICPML TYPE STRING,
OPTAB TYPE STRING,
PATNR TYPE STRING,
FALNR TYPE STRING,
FZIFF TYPE STRING,
FALAE TYPE STRING,
FALAR TYPE STRING,
ICDKT TYPE STRING,
ICDKY TYPE STRING,
CLASS TYPE STRING,
AUFTYP TYPE STRING,
AUFART TYPE STRING,
BEKAT TYPE STRING,
ACCCAT TYPE STRING,
ORGFA TYPE STRING,
ORGPF TYPE STRING,
LOS TYPE STRING,
DELIVERY TYPE STRING,
CHILDREN TYPE STRING,
RESID TYPE STRING,
MEDISAVE TYPE STRING,
PSYCHIAT TYPE STRING,
BARNR TYPE STRING,
PKGTK TYPE STRING,
PKGLS TYPE STRING,
PKGSP TYPE STRING,
AUFTXT TYPE STRING,
FATXT TYPE STRING,
BEKATTXT TYPE STRING,
AUFOFAKB TYPE STRING,
AUFOPFKB TYPE STRING,
AUFDIKTXT TYPE STRING,
AUFDIKTX2 TYPE STRING,
DOCCONCNAME TYPE STRING,
ICPMTXT TYPE STRING,
OPTABTXT TYPE STRING,
PKGLSTXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNF54_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_RNF54_STR-EINRI sy-vline 
WA_RNF54_STR-EDATE sy-vline 
WA_RNF54_STR-ICPMK sy-vline 
WA_RNF54_STR-ICPML sy-vline 
WA_RNF54_STR-OPTAB sy-vline 
WA_RNF54_STR-PATNR sy-vline 
WA_RNF54_STR-FALNR sy-vline 
WA_RNF54_STR-FZIFF sy-vline 
WA_RNF54_STR-FALAE sy-vline 
WA_RNF54_STR-FALAR sy-vline 
WA_RNF54_STR-ICDKT sy-vline 
WA_RNF54_STR-ICDKY sy-vline 
WA_RNF54_STR-CLASS sy-vline 
WA_RNF54_STR-AUFTYP sy-vline 
WA_RNF54_STR-AUFART sy-vline 
WA_RNF54_STR-BEKAT sy-vline 
WA_RNF54_STR-ACCCAT sy-vline 
WA_RNF54_STR-ORGFA sy-vline 
WA_RNF54_STR-ORGPF sy-vline 
WA_RNF54_STR-LOS sy-vline 
WA_RNF54_STR-DELIVERY sy-vline 
WA_RNF54_STR-CHILDREN sy-vline 
WA_RNF54_STR-RESID sy-vline 
WA_RNF54_STR-MEDISAVE sy-vline 
WA_RNF54_STR-PSYCHIAT sy-vline 
WA_RNF54_STR-BARNR sy-vline 
WA_RNF54_STR-PKGTK sy-vline 
WA_RNF54_STR-PKGLS sy-vline 
WA_RNF54_STR-PKGSP sy-vline 
WA_RNF54_STR-AUFTXT sy-vline 
WA_RNF54_STR-FATXT sy-vline 
WA_RNF54_STR-BEKATTXT sy-vline 
WA_RNF54_STR-AUFOFAKB sy-vline 
WA_RNF54_STR-AUFOPFKB sy-vline 
WA_RNF54_STR-AUFDIKTXT sy-vline 
WA_RNF54_STR-AUFDIKTX2 sy-vline 
WA_RNF54_STR-DOCCONCNAME sy-vline 
WA_RNF54_STR-ICPMTXT sy-vline 
WA_RNF54_STR-OPTABTXT sy-vline 
WA_RNF54_STR-PKGLSTXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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