ABAP Select data from SAP table TNCDF3 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TNCDF3 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 TNCDF3. 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 TNCDF3 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_TNCDF3 TYPE STANDARD TABLE OF TNCDF3,
      WA_TNCDF3 TYPE TNCDF3,
      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: <TNCDF3> TYPE TNCDF3.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TNCDF3.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TNCDF3
  INTO TABLE IT_TNCDF3.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TNCDF3
*  INTO TABLE @DATA(IT_TNCDF32).
*--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_TNCDF3 INDEX 1 INTO DATA(WA_TNCDF32).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TNCDF3 ASSIGNING <TNCDF3>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TNCDF3>-MANDT = 1.
<TNCDF3>-EINRI = 1.
<TNCDF3>-UNAME = 1.
<TNCDF3>-NINOUTSIGN = 1.
<TNCDF3>-BATCH = 1.

ENDLOOP.

LOOP AT IT_TNCDF3 INTO WA_TNCDF3.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TNCDF3-CDFID, sy-vline,
  WA_TNCDF3-INTERACTIV, sy-vline,
  WA_TNCDF3-DIRLINKID, sy-vline,
  WA_TNCDF3-ERDAT, sy-vline,
  WA_TNCDF3-ERTIM, sy-vline,
  WA_TNCDF3-ERUSR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TNCDF3 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_TNCDF3 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_TNCDF3 INTO WA_TNCDF3.


*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_TNCDF3-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TNCDF3-EINRI.
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_TNCDF3_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
UNAME TYPE STRING,
NINOUTSIGN TYPE STRING,
BATCH TYPE STRING,
CDFID TYPE STRING,
INTERACTIV TYPE STRING,
DIRLINKID TYPE STRING,
ERDAT TYPE STRING,
ERTIM TYPE STRING,
ERUSR TYPE STRING,
UPDAT TYPE STRING,
UPTIM TYPE STRING,
UPUSR TYPE STRING,
TRCSTP TYPE STRING,
TRCF TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TNCDF3_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_TNCDF3_STR-MANDT sy-vline 
WA_TNCDF3_STR-EINRI sy-vline 
WA_TNCDF3_STR-UNAME sy-vline 
WA_TNCDF3_STR-NINOUTSIGN sy-vline 
WA_TNCDF3_STR-BATCH sy-vline 
WA_TNCDF3_STR-CDFID sy-vline 
WA_TNCDF3_STR-INTERACTIV sy-vline 
WA_TNCDF3_STR-DIRLINKID sy-vline 
WA_TNCDF3_STR-ERDAT sy-vline 
WA_TNCDF3_STR-ERTIM sy-vline 
WA_TNCDF3_STR-ERUSR sy-vline 
WA_TNCDF3_STR-UPDAT sy-vline 
WA_TNCDF3_STR-UPTIM sy-vline 
WA_TNCDF3_STR-UPUSR sy-vline 
WA_TNCDF3_STR-TRCSTP sy-vline 
WA_TNCDF3_STR-TRCF sy-vline      INTO ld_text SEPARATED BY SPACE.

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