ABAP Select data from SAP table RNF34_IT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNF34_IT 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 RNF34_IT. 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 RNF34_IT 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_RNF34_IT TYPE STANDARD TABLE OF RNF34_IT,
      WA_RNF34_IT TYPE RNF34_IT,
      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: <RNF34_IT> TYPE RNF34_IT.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNF34_IT.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNF34_IT
  INTO TABLE IT_RNF34_IT.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNF34_IT
*  INTO TABLE @DATA(IT_RNF34_IT2).
*--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_RNF34_IT INDEX 1 INTO DATA(WA_RNF34_IT2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNF34_IT ASSIGNING <RNF34_IT>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNF34_IT>-TCLAS = 1.
<RNF34_IT>-TCLASTXT = 1.
<RNF34_IT>-TCPRI = 1.
<RNF34_IT>-TCPRITXT = 1.
<RNF34_IT>-UEXID = 1.

ENDLOOP.

LOOP AT IT_RNF34_IT INTO WA_RNF34_IT.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNF34_IT-EXCAT, sy-vline,
  WA_RNF34_IT-EXCATTXT, sy-vline,
  WA_RNF34_IT-EXCOD, sy-vline,
  WA_RNF34_IT-EXCODTXT, sy-vline,
  WA_RNF34_IT-BOKDT, sy-vline,
  WA_RNF34_IT-PFDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNF34_IT 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_RNF34_IT 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_RNF34_IT INTO WA_RNF34_IT.


*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 EXCAT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNF34_IT-EXCAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNF34_IT-EXCAT.
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_RNF34_IT_STR, 
TCLAS TYPE STRING,
TCLASTXT TYPE STRING,
TCPRI TYPE STRING,
TCPRITXT TYPE STRING,
UEXID TYPE STRING,
EXCAT TYPE STRING,
EXCATTXT TYPE STRING,
EXCOD TYPE STRING,
EXCODTXT TYPE STRING,
BOKDT TYPE STRING,
PFDAT TYPE STRING,
PFMOD TYPE STRING,
PFMODTXT TYPE STRING,
RETRI TYPE STRING,
RETRITXT TYPE STRING,
EXPID TYPE STRING,
APSTATE TYPE STRING,
APSTATETXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNF34_IT_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_RNF34_IT_STR-TCLAS sy-vline 
WA_RNF34_IT_STR-TCLASTXT sy-vline 
WA_RNF34_IT_STR-TCPRI sy-vline 
WA_RNF34_IT_STR-TCPRITXT sy-vline 
WA_RNF34_IT_STR-UEXID sy-vline 
WA_RNF34_IT_STR-EXCAT sy-vline 
WA_RNF34_IT_STR-EXCATTXT sy-vline 
WA_RNF34_IT_STR-EXCOD sy-vline 
WA_RNF34_IT_STR-EXCODTXT sy-vline 
WA_RNF34_IT_STR-BOKDT sy-vline 
WA_RNF34_IT_STR-PFDAT sy-vline 
WA_RNF34_IT_STR-PFMOD sy-vline 
WA_RNF34_IT_STR-PFMODTXT sy-vline 
WA_RNF34_IT_STR-RETRI sy-vline 
WA_RNF34_IT_STR-RETRITXT sy-vline 
WA_RNF34_IT_STR-EXPID sy-vline 
WA_RNF34_IT_STR-APSTATE sy-vline 
WA_RNF34_IT_STR-APSTATETXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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