ABAP Select data from SAP table TNCT2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TNCT2 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 TNCT2. 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 TNCT2 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_TNCT2 TYPE STANDARD TABLE OF TNCT2,
      WA_TNCT2 TYPE TNCT2,
      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: <TNCT2> TYPE TNCT2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TNCT2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TNCT2
  INTO TABLE IT_TNCT2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TNCT2
*  INTO TABLE @DATA(IT_TNCT22).
*--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_TNCT2 INDEX 1 INTO DATA(WA_TNCT22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TNCT2 ASSIGNING <TNCT2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TNCT2>-STAND = 1.
<TNCT2>-STVER = 1.
<TNCT2>-NTOWNERCDE = 1.
<TNCT2>-NTNR = 1.
<TNCT2>-LFDSG = 1.

ENDLOOP.

LOOP AT IT_TNCT2 INTO WA_TNCT2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TNCT2-SGOWNERCDE, sy-vline,
  WA_TNCT2-SGNR, sy-vline,
  WA_TNCT2-KZOPT, sy-vline,
  WA_TNCT2-REPEAT, sy-vline,
  WA_TNCT2-KZFIXREP, sy-vline,
  WA_TNCT2-PARAMIX1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TNCT2 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_TNCT2 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_TNCT2 INTO WA_TNCT2.


*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_TNCT2_STR, 
STAND TYPE STRING,
STVER TYPE STRING,
NTOWNERCDE TYPE STRING,
NTNR TYPE STRING,
LFDSG TYPE STRING,
SGOWNERCDE TYPE STRING,
SGNR TYPE STRING,
KZOPT TYPE STRING,
REPEAT TYPE STRING,
KZFIXREP TYPE STRING,
PARAMIX1 TYPE STRING,
PARAMIX2 TYPE STRING,
PARAMIX3 TYPE STRING,
PARAMIX4 TYPE STRING,
PARAMIX5 TYPE STRING,
PRIMSEG TYPE STRING,
SEGMVER TYPE STRING,
FBSEGM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TNCT2_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_TNCT2_STR-STAND sy-vline 
WA_TNCT2_STR-STVER sy-vline 
WA_TNCT2_STR-NTOWNERCDE sy-vline 
WA_TNCT2_STR-NTNR sy-vline 
WA_TNCT2_STR-LFDSG sy-vline 
WA_TNCT2_STR-SGOWNERCDE sy-vline 
WA_TNCT2_STR-SGNR sy-vline 
WA_TNCT2_STR-KZOPT sy-vline 
WA_TNCT2_STR-REPEAT sy-vline 
WA_TNCT2_STR-KZFIXREP sy-vline 
WA_TNCT2_STR-PARAMIX1 sy-vline 
WA_TNCT2_STR-PARAMIX2 sy-vline 
WA_TNCT2_STR-PARAMIX3 sy-vline 
WA_TNCT2_STR-PARAMIX4 sy-vline 
WA_TNCT2_STR-PARAMIX5 sy-vline 
WA_TNCT2_STR-PRIMSEG sy-vline 
WA_TNCT2_STR-SEGMVER sy-vline 
WA_TNCT2_STR-FBSEGM sy-vline      INTO ld_text SEPARATED BY SPACE.

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