ABAP Select data from SAP table RNF22 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNF22 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 RNF22. 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 RNF22 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_RNF22 TYPE STANDARD TABLE OF RNF22,
      WA_RNF22 TYPE RNF22,
      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: <RNF22> TYPE RNF22.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNF22.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNF22
  INTO TABLE IT_RNF22.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNF22
*  INTO TABLE @DATA(IT_RNF222).
*--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_RNF22 INDEX 1 INTO DATA(WA_RNF222).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNF22 ASSIGNING <RNF22>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNF22>-EINRI = 1.
<RNF22>-FALNR = 1.
<RNF22>-KOSTR = 1.
<RNF22>-VBELN = 1.
<RNF22>-FKDAT = 1.

ENDLOOP.

LOOP AT IT_RNF22 INTO WA_RNF22.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNF22-HBKID, sy-vline,
  WA_RNF22-HKTID, sy-vline,
  WA_RNF22-EINKB, sy-vline,
  WA_RNF22-EINBZ, sy-vline,
  WA_RNF22-LAND, sy-vline,
  WA_RNF22-PSTLZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNF22 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_RNF22 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_RNF22 INTO WA_RNF22.


*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_RNF22-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF22-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF22-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF22-FALNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KOSTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF22-KOSTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF22-KOSTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF22-VBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF22-VBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field INSTNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF22-INSTNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF22-INSTNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_RNF22-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF22-SPRAS.
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_RNF22_STR, 
EINRI TYPE STRING,
FALNR TYPE STRING,
KOSTR TYPE STRING,
VBELN TYPE STRING,
FKDAT TYPE STRING,
HBKID TYPE STRING,
HKTID TYPE STRING,
EINKB TYPE STRING,
EINBZ TYPE STRING,
LAND TYPE STRING,
PSTLZ TYPE STRING,
ORT TYPE STRING,
ORT2 TYPE STRING,
STRAS TYPE STRING,
INSTNR TYPE STRING,
SPRAS TYPE STRING,
WAERS TYPE STRING,
NBTRG TYPE STRING,
NAME1KTR TYPE STRING,
NAME2KTR TYPE STRING,
NAME3KTR TYPE STRING,
NAMEKURZ TYPE STRING,
LANDKTR TYPE STRING,
PSTLZKTR TYPE STRING,
ORTKTR TYPE STRING,
ORT2KTR TYPE STRING,
STRASKTR TYPE STRING,
UETEXT1 TYPE STRING,
UETEXT2 TYPE STRING,
UETEXT3 TYPE STRING,
KUREF TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNF22_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_RNF22_STR-EINRI sy-vline 
WA_RNF22_STR-FALNR sy-vline 
WA_RNF22_STR-KOSTR sy-vline 
WA_RNF22_STR-VBELN sy-vline 
WA_RNF22_STR-FKDAT sy-vline 
WA_RNF22_STR-HBKID sy-vline 
WA_RNF22_STR-HKTID sy-vline 
WA_RNF22_STR-EINKB sy-vline 
WA_RNF22_STR-EINBZ sy-vline 
WA_RNF22_STR-LAND sy-vline 
WA_RNF22_STR-PSTLZ sy-vline 
WA_RNF22_STR-ORT sy-vline 
WA_RNF22_STR-ORT2 sy-vline 
WA_RNF22_STR-STRAS sy-vline 
WA_RNF22_STR-INSTNR sy-vline 
WA_RNF22_STR-SPRAS sy-vline 
WA_RNF22_STR-WAERS sy-vline 
WA_RNF22_STR-NBTRG sy-vline 
WA_RNF22_STR-NAME1KTR sy-vline 
WA_RNF22_STR-NAME2KTR sy-vline 
WA_RNF22_STR-NAME3KTR sy-vline 
WA_RNF22_STR-NAMEKURZ sy-vline 
WA_RNF22_STR-LANDKTR sy-vline 
WA_RNF22_STR-PSTLZKTR sy-vline 
WA_RNF22_STR-ORTKTR sy-vline 
WA_RNF22_STR-ORT2KTR sy-vline 
WA_RNF22_STR-STRASKTR sy-vline 
WA_RNF22_STR-UETEXT1 sy-vline 
WA_RNF22_STR-UETEXT2 sy-vline 
WA_RNF22_STR-UETEXT3 sy-vline 
WA_RNF22_STR-KUREF sy-vline      INTO ld_text SEPARATED BY SPACE.

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