ABAP Select data from SAP table CFNNN into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CFNNN
*  INTO TABLE @DATA(IT_CFNNN2).
*--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_CFNNN INDEX 1 INTO DATA(WA_CFNNN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CFNNN>-MANDT = 1.
<CFNNN>-VERSIO = 1.
<CFNNN>-PLACTI = 1.
<CFNNN>-YEARB = 1.
<CFNNN>-PERDE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CFNNN-KEY01, sy-vline,
  WA_CFNNN-KEY02, sy-vline,
  WA_CFNNN-KEY03, sy-vline,
  WA_CFNNN-KEY04, sy-vline,
  WA_CFNNN-KEY05, sy-vline,
  WA_CFNNN-KEY06, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CFNNN 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_CFNNN 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_CFNNN INTO WA_CFNNN.


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

*Conversion exit GJAHR, internal->external for field YEARB
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_CFNNN-YEARB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CFNNN-YEARB.
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_CFNNN_STR, 
MANDT TYPE STRING,
VERSIO TYPE STRING,
PLACTI TYPE STRING,
YEARB TYPE STRING,
PERDE TYPE STRING,
KEY01 TYPE STRING,
KEY02 TYPE STRING,
KEY03 TYPE STRING,
KEY04 TYPE STRING,
KEY05 TYPE STRING,
KEY06 TYPE STRING,
KEY07 TYPE STRING,
KEY08 TYPE STRING,
KEY09 TYPE STRING,
RECNR TYPE STRING,
AEDTM TYPE STRING,
UNAME TYPE STRING,
PINTR TYPE STRING,
KEY10 TYPE STRING,
KEY11 TYPE STRING,
KEY12 TYPE STRING,
KEY13 TYPE STRING,
KEY14 TYPE STRING,
KEY15 TYPE STRING,
KEY16 TYPE STRING,
KEY17 TYPE STRING,
KEY18 TYPE STRING,
KEY19 TYPE STRING,
DAT01 TYPE STRING,
UNI01 TYPE STRING,
DAT02 TYPE STRING,
UNI02 TYPE STRING,
DAT03 TYPE STRING,
UNI03 TYPE STRING,
DAT04 TYPE STRING,
UNI04 TYPE STRING,
DAT05 TYPE STRING,
UNI05 TYPE STRING,
DAT06 TYPE STRING,
UNI06 TYPE STRING,
DAT07 TYPE STRING,
UNI07 TYPE STRING,
DAT08 TYPE STRING,
UNI08 TYPE STRING,
DAT09 TYPE STRING,
UNI09 TYPE STRING,
DAT10 TYPE STRING,
UNI10 TYPE STRING,
DAT11 TYPE STRING,
UNI11 TYPE STRING,
DAT12 TYPE STRING,
UNI12 TYPE STRING,
DAT13 TYPE STRING,
UNI13 TYPE STRING,
DAT14 TYPE STRING,
UNI14 TYPE STRING,
DAT15 TYPE STRING,
UNI15 TYPE STRING,
DAT16 TYPE STRING,
UNI16 TYPE STRING,
DAT17 TYPE STRING,
UNI17 TYPE STRING,
DAT18 TYPE STRING,
UNI18 TYPE STRING,
DAT19 TYPE STRING,
UNI19 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CFNNN_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_CFNNN_STR-MANDT sy-vline 
WA_CFNNN_STR-VERSIO sy-vline 
WA_CFNNN_STR-PLACTI sy-vline 
WA_CFNNN_STR-YEARB sy-vline 
WA_CFNNN_STR-PERDE sy-vline 
WA_CFNNN_STR-KEY01 sy-vline 
WA_CFNNN_STR-KEY02 sy-vline 
WA_CFNNN_STR-KEY03 sy-vline 
WA_CFNNN_STR-KEY04 sy-vline 
WA_CFNNN_STR-KEY05 sy-vline 
WA_CFNNN_STR-KEY06 sy-vline 
WA_CFNNN_STR-KEY07 sy-vline 
WA_CFNNN_STR-KEY08 sy-vline 
WA_CFNNN_STR-KEY09 sy-vline 
WA_CFNNN_STR-RECNR sy-vline 
WA_CFNNN_STR-AEDTM sy-vline 
WA_CFNNN_STR-UNAME sy-vline 
WA_CFNNN_STR-PINTR sy-vline 
WA_CFNNN_STR-KEY10 sy-vline 
WA_CFNNN_STR-KEY11 sy-vline 
WA_CFNNN_STR-KEY12 sy-vline 
WA_CFNNN_STR-KEY13 sy-vline 
WA_CFNNN_STR-KEY14 sy-vline 
WA_CFNNN_STR-KEY15 sy-vline 
WA_CFNNN_STR-KEY16 sy-vline 
WA_CFNNN_STR-KEY17 sy-vline 
WA_CFNNN_STR-KEY18 sy-vline 
WA_CFNNN_STR-KEY19 sy-vline 
WA_CFNNN_STR-DAT01 sy-vline 
WA_CFNNN_STR-UNI01 sy-vline 
WA_CFNNN_STR-DAT02 sy-vline 
WA_CFNNN_STR-UNI02 sy-vline 
WA_CFNNN_STR-DAT03 sy-vline 
WA_CFNNN_STR-UNI03 sy-vline 
WA_CFNNN_STR-DAT04 sy-vline 
WA_CFNNN_STR-UNI04 sy-vline 
WA_CFNNN_STR-DAT05 sy-vline 
WA_CFNNN_STR-UNI05 sy-vline 
WA_CFNNN_STR-DAT06 sy-vline 
WA_CFNNN_STR-UNI06 sy-vline 
WA_CFNNN_STR-DAT07 sy-vline 
WA_CFNNN_STR-UNI07 sy-vline 
WA_CFNNN_STR-DAT08 sy-vline 
WA_CFNNN_STR-UNI08 sy-vline 
WA_CFNNN_STR-DAT09 sy-vline 
WA_CFNNN_STR-UNI09 sy-vline 
WA_CFNNN_STR-DAT10 sy-vline 
WA_CFNNN_STR-UNI10 sy-vline 
WA_CFNNN_STR-DAT11 sy-vline 
WA_CFNNN_STR-UNI11 sy-vline 
WA_CFNNN_STR-DAT12 sy-vline 
WA_CFNNN_STR-UNI12 sy-vline 
WA_CFNNN_STR-DAT13 sy-vline 
WA_CFNNN_STR-UNI13 sy-vline 
WA_CFNNN_STR-DAT14 sy-vline 
WA_CFNNN_STR-UNI14 sy-vline 
WA_CFNNN_STR-DAT15 sy-vline 
WA_CFNNN_STR-UNI15 sy-vline 
WA_CFNNN_STR-DAT16 sy-vline 
WA_CFNNN_STR-UNI16 sy-vline 
WA_CFNNN_STR-DAT17 sy-vline 
WA_CFNNN_STR-UNI17 sy-vline 
WA_CFNNN_STR-DAT18 sy-vline 
WA_CFNNN_STR-UNI18 sy-vline 
WA_CFNNN_STR-DAT19 sy-vline 
WA_CFNNN_STR-UNI19 sy-vline      INTO ld_text SEPARATED BY SPACE.

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