ABAP Select data from SAP table TNCF0 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TNCF0 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 TNCF0. 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 TNCF0 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_TNCF0 TYPE STANDARD TABLE OF TNCF0,
      WA_TNCF0 TYPE TNCF0,
      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: <TNCF0> TYPE TNCF0.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TNCF0.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TNCF0
  INTO TABLE IT_TNCF0.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TNCF0
*  INTO TABLE @DATA(IT_TNCF02).
*--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_TNCF0 INDEX 1 INTO DATA(WA_TNCF02).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TNCF0 ASSIGNING <TNCF0>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TNCF0>-STAND = 1.
<TNCF0>-STVER = 1.
<TNCF0>-FDNAM = 1.
<TNCF0>-FILLERKZ = 1.
<TNCF0>-FDLEN = 1.

ENDLOOP.

LOOP AT IT_TNCF0 INTO WA_TNCF0.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TNCF0-FDDBT, sy-vline,
  WA_TNCF0-FDDBF, sy-vline,
  WA_TNCF0-FDBF1, sy-vline,
  WA_TNCF0-FDBO1, sy-vline,
  WA_TNCF0-FDBW1, sy-vline,
  WA_TNCF0-FDVKN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TNCF0 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_TNCF0 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_TNCF0 INTO WA_TNCF0.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_TNCF0_STR, 
STAND TYPE STRING,
STVER TYPE STRING,
FDNAM TYPE STRING,
FILLERKZ TYPE STRING,
FDLEN TYPE STRING,
FDDBT TYPE STRING,
FDDBF TYPE STRING,
FDBF1 TYPE STRING,
FDBO1 TYPE STRING,
FDBW1 TYPE STRING,
FDVKN TYPE STRING,
FDBF2 TYPE STRING,
FDBO2 TYPE STRING,
FDBW2 TYPE STRING,
HL7ITEMNO TYPE STRING,
HL7REPSIGN TYPE STRING,
SAPSERVICE TYPE STRING,
CONTENTS TYPE STRING,
HL7TABLE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TNCF0_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_TNCF0_STR-STAND sy-vline 
WA_TNCF0_STR-STVER sy-vline 
WA_TNCF0_STR-FDNAM sy-vline 
WA_TNCF0_STR-FILLERKZ sy-vline 
WA_TNCF0_STR-FDLEN sy-vline 
WA_TNCF0_STR-FDDBT sy-vline 
WA_TNCF0_STR-FDDBF sy-vline 
WA_TNCF0_STR-FDBF1 sy-vline 
WA_TNCF0_STR-FDBO1 sy-vline 
WA_TNCF0_STR-FDBW1 sy-vline 
WA_TNCF0_STR-FDVKN sy-vline 
WA_TNCF0_STR-FDBF2 sy-vline 
WA_TNCF0_STR-FDBO2 sy-vline 
WA_TNCF0_STR-FDBW2 sy-vline 
WA_TNCF0_STR-HL7ITEMNO sy-vline 
WA_TNCF0_STR-HL7REPSIGN sy-vline 
WA_TNCF0_STR-SAPSERVICE sy-vline 
WA_TNCF0_STR-CONTENTS sy-vline 
WA_TNCF0_STR-HL7TABLE sy-vline      INTO ld_text SEPARATED BY SPACE.

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