ABAP Select data from SAP table TFK042U into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TFK042U 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 TFK042U. 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 TFK042U 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_TFK042U TYPE STANDARD TABLE OF TFK042U,
      WA_TFK042U TYPE TFK042U,
      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: <TFK042U> TYPE TFK042U.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TFK042U.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TFK042U
  INTO TABLE IT_TFK042U.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TFK042U
*  INTO TABLE @DATA(IT_TFK042U2).
*--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_TFK042U INDEX 1 INTO DATA(WA_TFK042U2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TFK042U ASSIGNING <TFK042U>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TFK042U>-MANDT = 1.
<TFK042U>-UNAME = 1.
<TFK042U>-LFDNR = 1.
<TFK042U>-BNKID = 1.
<TFK042U>-XEINZ = 1.

ENDLOOP.

LOOP AT IT_TFK042U INTO WA_TFK042U.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TFK042U-PRODA, sy-vline,
  WA_TFK042U-LAUFD, sy-vline,
  WA_TFK042U-LAUFI, sy-vline,
  WA_TFK042U-ORG1T, sy-vline,
  WA_TFK042U-ORG1R, sy-vline,
  WA_TFK042U-HBKID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TFK042U 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_TFK042U 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_TFK042U INTO WA_TFK042U.


*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 UBHKT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TFK042U-UBHKT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TFK042U-UBHKT.
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_TFK042U_STR, 
MANDT TYPE STRING,
UNAME TYPE STRING,
LFDNR TYPE STRING,
BNKID TYPE STRING,
XEINZ TYPE STRING,
PRODA TYPE STRING,
LAUFD TYPE STRING,
LAUFI TYPE STRING,
ORG1T TYPE STRING,
ORG1R TYPE STRING,
HBKID TYPE STRING,
HKTID TYPE STRING,
UBHKT TYPE STRING,
RWBTR TYPE STRING,
WAERS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TFK042U_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_TFK042U_STR-MANDT sy-vline 
WA_TFK042U_STR-UNAME sy-vline 
WA_TFK042U_STR-LFDNR sy-vline 
WA_TFK042U_STR-BNKID sy-vline 
WA_TFK042U_STR-XEINZ sy-vline 
WA_TFK042U_STR-PRODA sy-vline 
WA_TFK042U_STR-LAUFD sy-vline 
WA_TFK042U_STR-LAUFI sy-vline 
WA_TFK042U_STR-ORG1T sy-vline 
WA_TFK042U_STR-ORG1R sy-vline 
WA_TFK042U_STR-HBKID sy-vline 
WA_TFK042U_STR-HKTID sy-vline 
WA_TFK042U_STR-UBHKT sy-vline 
WA_TFK042U_STR-RWBTR sy-vline 
WA_TFK042U_STR-WAERS sy-vline      INTO ld_text SEPARATED BY SPACE.

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