ABAP Select data from SAP table TNCS0 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TNCS0 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 TNCS0. 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 TNCS0 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_TNCS0 TYPE STANDARD TABLE OF TNCS0,
      WA_TNCS0 TYPE TNCS0,
      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: <TNCS0> TYPE TNCS0.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TNCS0.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TNCS0
  INTO TABLE IT_TNCS0.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TNCS0
*  INTO TABLE @DATA(IT_TNCS02).
*--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_TNCS0 INDEX 1 INTO DATA(WA_TNCS02).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TNCS0 ASSIGNING <TNCS0>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TNCS0>-STAND = 1.
<TNCS0>-STVER = 1.
<TNCS0>-SGOWNERCDE = 1.
<TNCS0>-SGNR = 1.
<TNCS0>-SGKRZ = 1.

ENDLOOP.

LOOP AT IT_TNCS0 INTO WA_TNCS0.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TNCS0-SGPAR1, sy-vline,
  WA_TNCS0-SGPAR2, sy-vline,
  WA_TNCS0-SGPAR3, sy-vline,
  WA_TNCS0-SGPAR4, sy-vline,
  WA_TNCS0-SGPAR5, sy-vline,
  WA_TNCS0-SGPRIDB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TNCS0 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_TNCS0 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_TNCS0 INTO WA_TNCS0.


*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_TNCS0_STR, 
STAND TYPE STRING,
STVER TYPE STRING,
SGOWNERCDE TYPE STRING,
SGNR TYPE STRING,
SGKRZ TYPE STRING,
SGPAR1 TYPE STRING,
SGPAR2 TYPE STRING,
SGPAR3 TYPE STRING,
SGPAR4 TYPE STRING,
SGPAR5 TYPE STRING,
SGPRIDB TYPE STRING,
SGSECDB1 TYPE STRING,
SGMXLDB1 TYPE STRING,
SGSECDB2 TYPE STRING,
SGMXLDB2 TYPE STRING,
SGSECDB3 TYPE STRING,
SGMXLDB3 TYPE STRING,
SGSECDB4 TYPE STRING,
SGMXLDB4 TYPE STRING,
SGSECDB5 TYPE STRING,
SGMXLDB5 TYPE STRING,
FRMDBT TYPE STRING,
INPOOL TYPE STRING,
INPROC TYPE STRING,
OUTPOOL TYPE STRING,
OUTPROC TYPE STRING,
AUTOFILL TYPE STRING,
REPEAT TYPE STRING,
SGSTAT TYPE STRING,
UPMANDT TYPE STRING,
SGAEU TYPE STRING,
SGADT TYPE STRING,
FBSEGM TYPE STRING,
ADDFIELDS TYPE STRING,
HEADERSIGN TYPE STRING,
ENDSGMSIGN TYPE STRING,
LGRSGMSIGN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TNCS0_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_TNCS0_STR-STAND sy-vline 
WA_TNCS0_STR-STVER sy-vline 
WA_TNCS0_STR-SGOWNERCDE sy-vline 
WA_TNCS0_STR-SGNR sy-vline 
WA_TNCS0_STR-SGKRZ sy-vline 
WA_TNCS0_STR-SGPAR1 sy-vline 
WA_TNCS0_STR-SGPAR2 sy-vline 
WA_TNCS0_STR-SGPAR3 sy-vline 
WA_TNCS0_STR-SGPAR4 sy-vline 
WA_TNCS0_STR-SGPAR5 sy-vline 
WA_TNCS0_STR-SGPRIDB sy-vline 
WA_TNCS0_STR-SGSECDB1 sy-vline 
WA_TNCS0_STR-SGMXLDB1 sy-vline 
WA_TNCS0_STR-SGSECDB2 sy-vline 
WA_TNCS0_STR-SGMXLDB2 sy-vline 
WA_TNCS0_STR-SGSECDB3 sy-vline 
WA_TNCS0_STR-SGMXLDB3 sy-vline 
WA_TNCS0_STR-SGSECDB4 sy-vline 
WA_TNCS0_STR-SGMXLDB4 sy-vline 
WA_TNCS0_STR-SGSECDB5 sy-vline 
WA_TNCS0_STR-SGMXLDB5 sy-vline 
WA_TNCS0_STR-FRMDBT sy-vline 
WA_TNCS0_STR-INPOOL sy-vline 
WA_TNCS0_STR-INPROC sy-vline 
WA_TNCS0_STR-OUTPOOL sy-vline 
WA_TNCS0_STR-OUTPROC sy-vline 
WA_TNCS0_STR-AUTOFILL sy-vline 
WA_TNCS0_STR-REPEAT sy-vline 
WA_TNCS0_STR-SGSTAT sy-vline 
WA_TNCS0_STR-UPMANDT sy-vline 
WA_TNCS0_STR-SGAEU sy-vline 
WA_TNCS0_STR-SGADT sy-vline 
WA_TNCS0_STR-FBSEGM sy-vline 
WA_TNCS0_STR-ADDFIELDS sy-vline 
WA_TNCS0_STR-HEADERSIGN sy-vline 
WA_TNCS0_STR-ENDSGMSIGN sy-vline 
WA_TNCS0_STR-LGRSGMSIGN sy-vline      INTO ld_text SEPARATED BY SPACE.

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