ABAP Select data from SAP table TNC301XI into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TNC301XI 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 TNC301XI. 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 TNC301XI 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_TNC301XI TYPE STANDARD TABLE OF TNC301XI,
      WA_TNC301XI TYPE TNC301XI,
      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: <TNC301XI> TYPE TNC301XI.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TNC301XI.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TNC301XI
  INTO TABLE IT_TNC301XI.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TNC301XI
*  INTO TABLE @DATA(IT_TNC301XI2).
*--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_TNC301XI INDEX 1 INTO DATA(WA_TNC301XI2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TNC301XI ASSIGNING <TNC301XI>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TNC301XI>-MANDT = 1.
<TNC301XI>-EINRI = 1.
<TNC301XI>-EDIPROC = 1.
<TNC301XI>-TECHADR = 1.
<TNC301XI>-ADRTYPE = 1.

ENDLOOP.

LOOP AT IT_TNC301XI INTO WA_TNC301XI.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TNC301XI-ID1, sy-vline,
  WA_TNC301XI-ID2, sy-vline,
  WA_TNC301XI-ID3, sy-vline,
  WA_TNC301XI-UPDAT, sy-vline,
  WA_TNC301XI-UPTIM, sy-vline,
  WA_TNC301XI-UPUSR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TNC301XI 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_TNC301XI 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_TNC301XI INTO WA_TNC301XI.


*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_TNC301XI-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TNC301XI-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_TNC301XI_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
EDIPROC TYPE STRING,
TECHADR TYPE STRING,
ADRTYPE TYPE STRING,
ID1 TYPE STRING,
ID2 TYPE STRING,
ID3 TYPE STRING,
UPDAT TYPE STRING,
UPTIM TYPE STRING,
UPUSR TYPE STRING,
ERDAT TYPE STRING,
ERTIM TYPE STRING,
ERUSR TYPE STRING,
SUPAUTOCH TYPE STRING,
EREASON TYPE STRING,
EXTRANR TYPE STRING,
HOLDEDI TYPE STRING,
REFCD TYPE STRING,
REFER TYPE STRING,
COMTE TYPE STRING,
COMFC TYPE STRING,
COMEM TYPE STRING,
SEL_PRI TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TNC301XI_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_TNC301XI_STR-MANDT sy-vline 
WA_TNC301XI_STR-EINRI sy-vline 
WA_TNC301XI_STR-EDIPROC sy-vline 
WA_TNC301XI_STR-TECHADR sy-vline 
WA_TNC301XI_STR-ADRTYPE sy-vline 
WA_TNC301XI_STR-ID1 sy-vline 
WA_TNC301XI_STR-ID2 sy-vline 
WA_TNC301XI_STR-ID3 sy-vline 
WA_TNC301XI_STR-UPDAT sy-vline 
WA_TNC301XI_STR-UPTIM sy-vline 
WA_TNC301XI_STR-UPUSR sy-vline 
WA_TNC301XI_STR-ERDAT sy-vline 
WA_TNC301XI_STR-ERTIM sy-vline 
WA_TNC301XI_STR-ERUSR sy-vline 
WA_TNC301XI_STR-SUPAUTOCH sy-vline 
WA_TNC301XI_STR-EREASON sy-vline 
WA_TNC301XI_STR-EXTRANR sy-vline 
WA_TNC301XI_STR-HOLDEDI sy-vline 
WA_TNC301XI_STR-REFCD sy-vline 
WA_TNC301XI_STR-REFER sy-vline 
WA_TNC301XI_STR-COMTE sy-vline 
WA_TNC301XI_STR-COMFC sy-vline 
WA_TNC301XI_STR-COMEM sy-vline 
WA_TNC301XI_STR-SEL_PRI sy-vline      INTO ld_text SEPARATED BY SPACE.

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