ABAP Select data from SAP table T168 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T168 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 T168. 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 T168 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_T168 TYPE STANDARD TABLE OF T168,
      WA_T168 TYPE T168,
      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: <T168> TYPE T168.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T168.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T168
  INTO TABLE IT_T168.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T168
*  INTO TABLE @DATA(IT_T1682).
*--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_T168 INDEX 1 INTO DATA(WA_T1682).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T168 ASSIGNING <T168>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T168>-MANDT = 1.
<T168>-VORGA = 1.
<T168>-FCODE = 1.
<T168>-TRTYP = 1.
<T168>-AKTYP = 1.

ENDLOOP.

LOOP AT IT_T168 INTO WA_T168.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T168-DYNGR, sy-vline,
  WA_T168-STEU1, sy-vline,
  WA_T168-STEU2, sy-vline,
  WA_T168-DYPNO, sy-vline,
  WA_T168-NAKTP, sy-vline,
  WA_T168-NFCOD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T168 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_T168 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_T168 INTO WA_T168.


*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_T168_STR, 
MANDT TYPE STRING,
VORGA TYPE STRING,
FCODE TYPE STRING,
TRTYP TYPE STRING,
AKTYP TYPE STRING,
DYNGR TYPE STRING,
STEU1 TYPE STRING,
STEU2 TYPE STRING,
DYPNO TYPE STRING,
NAKTP TYPE STRING,
NFCOD TYPE STRING,
CALKZ TYPE STRING,
WINX1 TYPE STRING,
WINY1 TYPE STRING,
WINX2 TYPE STRING,
WINY2 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T168_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_T168_STR-MANDT sy-vline 
WA_T168_STR-VORGA sy-vline 
WA_T168_STR-FCODE sy-vline 
WA_T168_STR-TRTYP sy-vline 
WA_T168_STR-AKTYP sy-vline 
WA_T168_STR-DYNGR sy-vline 
WA_T168_STR-STEU1 sy-vline 
WA_T168_STR-STEU2 sy-vline 
WA_T168_STR-DYPNO sy-vline 
WA_T168_STR-NAKTP sy-vline 
WA_T168_STR-NFCOD sy-vline 
WA_T168_STR-CALKZ sy-vline 
WA_T168_STR-WINX1 sy-vline 
WA_T168_STR-WINY1 sy-vline 
WA_T168_STR-WINX2 sy-vline 
WA_T168_STR-WINY2 sy-vline      INTO ld_text SEPARATED BY SPACE.

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