ABAP Select data from SAP table TFK042B into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TFK042B 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 TFK042B. 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 TFK042B 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_TFK042B TYPE STANDARD TABLE OF TFK042B,
      WA_TFK042B TYPE TFK042B,
      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: <TFK042B> TYPE TFK042B.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TFK042B.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TFK042B
  INTO TABLE IT_TFK042B.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TFK042B
*  INTO TABLE @DATA(IT_TFK042B2).
*--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_TFK042B INDEX 1 INTO DATA(WA_TFK042B2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TFK042B ASSIGNING <TFK042B>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TFK042B>-MANDT = 1.
<TFK042B>-OPBUK = 1.
<TFK042B>-MINDS = 1.
<TFK042B>-MINDH = 1.
<TFK042B>-XKDFB = 1.

ENDLOOP.

LOOP AT IT_TFK042B INTO WA_TFK042B.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TFK042B-AFORN, sy-vline,
  WA_TFK042B-EFORN, sy-vline,
  WA_TFK042B-XDDAN, sy-vline,
  WA_TFK042B-XPREN, sy-vline,
  WA_TFK042B-XAMCH, sy-vline,
  WA_TFK042B-XDDLC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TFK042B 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_TFK042B 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_TFK042B INTO WA_TFK042B.


*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_TFK042B_STR, 
MANDT TYPE STRING,
OPBUK TYPE STRING,
MINDS TYPE STRING,
MINDH TYPE STRING,
XKDFB TYPE STRING,
AFORN TYPE STRING,
EFORN TYPE STRING,
XDDAN TYPE STRING,
XPREN TYPE STRING,
XAMCH TYPE STRING,
XDDLC TYPE STRING,
REC_CRDID TYPE STRING,
XDDAS TYPE STRING,
XNUMK TYPE STRING,
PREFB TYPE STRING,
PREFC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TFK042B_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_TFK042B_STR-MANDT sy-vline 
WA_TFK042B_STR-OPBUK sy-vline 
WA_TFK042B_STR-MINDS sy-vline 
WA_TFK042B_STR-MINDH sy-vline 
WA_TFK042B_STR-XKDFB sy-vline 
WA_TFK042B_STR-AFORN sy-vline 
WA_TFK042B_STR-EFORN sy-vline 
WA_TFK042B_STR-XDDAN sy-vline 
WA_TFK042B_STR-XPREN sy-vline 
WA_TFK042B_STR-XAMCH sy-vline 
WA_TFK042B_STR-XDDLC sy-vline 
WA_TFK042B_STR-REC_CRDID sy-vline 
WA_TFK042B_STR-XDDAS sy-vline 
WA_TFK042B_STR-XNUMK sy-vline 
WA_TFK042B_STR-PREFB sy-vline 
WA_TFK042B_STR-PREFC sy-vline      INTO ld_text SEPARATED BY SPACE.

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