ABAP Select data from SAP table RNF26 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNF26 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 RNF26. 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 RNF26 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_RNF26 TYPE STANDARD TABLE OF RNF26,
      WA_RNF26 TYPE RNF26,
      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: <RNF26> TYPE RNF26.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNF26.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNF26
  INTO TABLE IT_RNF26.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNF26
*  INTO TABLE @DATA(IT_RNF262).
*--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_RNF26 INDEX 1 INTO DATA(WA_RNF262).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNF26 ASSIGNING <RNF26>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNF26>-FALNR = 1.
<RNF26>-KSEMPF = 1.
<RNF26>-NAME1KSE = 1.
<RNF26>-NAME2KSE = 1.
<RNF26>-NAME3KSE = 1.

ENDLOOP.

LOOP AT IT_RNF26 INTO WA_RNF26.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNF26-ANREDKSE, sy-vline,
  WA_RNF26-TITELKSE, sy-vline,
  WA_RNF26-NAMZUKSE, sy-vline,
  WA_RNF26-VORSWKSE, sy-vline,
  WA_RNF26-LANDKSE, sy-vline,
  WA_RNF26-PSTLZKSE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNF26 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_RNF26 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_RNF26 INTO WA_RNF26.


*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 FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF26-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF26-FALNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KSEMPF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF26-KSEMPF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF26-KSEMPF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field INSTNRKSE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF26-INSTNRKSE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF26-INSTNRKSE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field INSTNRKTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF26-INSTNRKTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF26-INSTNRKTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF26-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF26-KUNNR.
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_RNF26_STR, 
FALNR TYPE STRING,
KSEMPF TYPE STRING,
NAME1KSE TYPE STRING,
NAME2KSE TYPE STRING,
NAME3KSE TYPE STRING,
ANREDKSE TYPE STRING,
TITELKSE TYPE STRING,
NAMZUKSE TYPE STRING,
VORSWKSE TYPE STRING,
LANDKSE TYPE STRING,
PSTLZKSE TYPE STRING,
ORTKSE TYPE STRING,
ORT2KSE TYPE STRING,
STRASKSE TYPE STRING,
TELFNKSE TYPE STRING,
TELFXKSE TYPE STRING,
INSTNRKSE TYPE STRING,
TELEXKSE TYPE STRING,
PFACHKSE TYPE STRING,
PLZPFKSE TYPE STRING,
PFORT TYPE STRING,
CONCATPAT TYPE STRING,
INSTNRKTR TYPE STRING,
KUNNR TYPE STRING,
ERDAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNF26_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_RNF26_STR-FALNR sy-vline 
WA_RNF26_STR-KSEMPF sy-vline 
WA_RNF26_STR-NAME1KSE sy-vline 
WA_RNF26_STR-NAME2KSE sy-vline 
WA_RNF26_STR-NAME3KSE sy-vline 
WA_RNF26_STR-ANREDKSE sy-vline 
WA_RNF26_STR-TITELKSE sy-vline 
WA_RNF26_STR-NAMZUKSE sy-vline 
WA_RNF26_STR-VORSWKSE sy-vline 
WA_RNF26_STR-LANDKSE sy-vline 
WA_RNF26_STR-PSTLZKSE sy-vline 
WA_RNF26_STR-ORTKSE sy-vline 
WA_RNF26_STR-ORT2KSE sy-vline 
WA_RNF26_STR-STRASKSE sy-vline 
WA_RNF26_STR-TELFNKSE sy-vline 
WA_RNF26_STR-TELFXKSE sy-vline 
WA_RNF26_STR-INSTNRKSE sy-vline 
WA_RNF26_STR-TELEXKSE sy-vline 
WA_RNF26_STR-PFACHKSE sy-vline 
WA_RNF26_STR-PLZPFKSE sy-vline 
WA_RNF26_STR-PFORT sy-vline 
WA_RNF26_STR-CONCATPAT sy-vline 
WA_RNF26_STR-INSTNRKTR sy-vline 
WA_RNF26_STR-KUNNR sy-vline 
WA_RNF26_STR-ERDAT sy-vline      INTO ld_text SEPARATED BY SPACE.

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