ABAP Select data from SAP table TN16DC into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TN16DC 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 TN16DC. 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 TN16DC 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_TN16DC TYPE STANDARD TABLE OF TN16DC,
      WA_TN16DC TYPE TN16DC,
      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: <TN16DC> TYPE TN16DC.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TN16DC.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TN16DC
  INTO TABLE IT_TN16DC.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TN16DC
*  INTO TABLE @DATA(IT_TN16DC2).
*--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_TN16DC INDEX 1 INTO DATA(WA_TN16DC2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TN16DC ASSIGNING <TN16DC>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TN16DC>-MANDT = 1.
<TN16DC>-EINRI = 1.
<TN16DC>-ENDDT = 1.
<TN16DC>-BEGDT = 1.
<TN16DC>-GENDC = 1.

ENDLOOP.

LOOP AT IT_TN16DC INTO WA_TN16DC.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TN16DC-GENAF, sy-vline,
  WA_TN16DC-DAYDC, sy-vline,
  WA_TN16DC-DAYAF, sy-vline,
  WA_TN16DC-PSYDC, sy-vline,
  WA_TN16DC-PSYAF, sy-vline,
  WA_TN16DC-HEPB1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TN16DC 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_TN16DC 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_TN16DC INTO WA_TN16DC.


*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_TN16DC-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN16DC-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field NOBST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TN16DC-NOBST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN16DC-NOBST.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field NLIGA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TN16DC-NLIGA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN16DC-NLIGA.
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_TN16DC_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
ENDDT TYPE STRING,
BEGDT TYPE STRING,
GENDC TYPE STRING,
GENAF TYPE STRING,
DAYDC TYPE STRING,
DAYAF TYPE STRING,
PSYDC TYPE STRING,
PSYAF TYPE STRING,
HEPB1 TYPE STRING,
HEPB2 TYPE STRING,
HEPB3 TYPE STRING,
RADEX TYPE STRING,
BRAWI TYPE STRING,
BRANO TYPE STRING,
ASSCP TYPE STRING,
NOBST TYPE STRING,
NLIGA TYPE STRING,
MAXOP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TN16DC_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_TN16DC_STR-MANDT sy-vline 
WA_TN16DC_STR-EINRI sy-vline 
WA_TN16DC_STR-ENDDT sy-vline 
WA_TN16DC_STR-BEGDT sy-vline 
WA_TN16DC_STR-GENDC sy-vline 
WA_TN16DC_STR-GENAF sy-vline 
WA_TN16DC_STR-DAYDC sy-vline 
WA_TN16DC_STR-DAYAF sy-vline 
WA_TN16DC_STR-PSYDC sy-vline 
WA_TN16DC_STR-PSYAF sy-vline 
WA_TN16DC_STR-HEPB1 sy-vline 
WA_TN16DC_STR-HEPB2 sy-vline 
WA_TN16DC_STR-HEPB3 sy-vline 
WA_TN16DC_STR-RADEX sy-vline 
WA_TN16DC_STR-BRAWI sy-vline 
WA_TN16DC_STR-BRANO sy-vline 
WA_TN16DC_STR-ASSCP sy-vline 
WA_TN16DC_STR-NOBST sy-vline 
WA_TN16DC_STR-NLIGA sy-vline 
WA_TN16DC_STR-MAXOP sy-vline      INTO ld_text SEPARATED BY SPACE.

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