ABAP Select data from SAP table TFK056A into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TFK056A 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 TFK056A. 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 TFK056A 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_TFK056A TYPE STANDARD TABLE OF TFK056A,
      WA_TFK056A TYPE TFK056A,
      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: <TFK056A> TYPE TFK056A.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TFK056A.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TFK056A
  INTO TABLE IT_TFK056A.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TFK056A
*  INTO TABLE @DATA(IT_TFK056A2).
*--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_TFK056A INDEX 1 INTO DATA(WA_TFK056A2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TFK056A ASSIGNING <TFK056A>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TFK056A>-MANDT = 1.
<TFK056A>-IKEY = 1.
<TFK056A>-TODAYS = 1.
<TFK056A>-IRUNITO = 1.
<TFK056A>-TRDAYS = 1.

ENDLOOP.

LOOP AT IT_TFK056A INTO WA_TFK056A.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TFK056A-IRUNITR, sy-vline,
  WA_TFK056A-IRHYTH, sy-vline,
  WA_TFK056A-IRUNIT, sy-vline,
  WA_TFK056A-IRULE, sy-vline,
  WA_TFK056A-HVORG, sy-vline,
  WA_TFK056A-TVORG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TFK056A 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_TFK056A 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_TFK056A INTO WA_TFK056A.


*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 IRULE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TFK056A-IRULE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TFK056A-IRULE.
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_TFK056A_STR, 
MANDT TYPE STRING,
IKEY TYPE STRING,
TODAYS TYPE STRING,
IRUNITO TYPE STRING,
TRDAYS TYPE STRING,
IRUNITR TYPE STRING,
IRHYTH TYPE STRING,
IRUNIT TYPE STRING,
IRULE TYPE STRING,
HVORG TYPE STRING,
TVORG TYPE STRING,
VERZZP TYPE STRING,
VERZWE TYPE STRING,
ICOND TYPE STRING,
IALLZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TFK056A_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_TFK056A_STR-MANDT sy-vline 
WA_TFK056A_STR-IKEY sy-vline 
WA_TFK056A_STR-TODAYS sy-vline 
WA_TFK056A_STR-IRUNITO sy-vline 
WA_TFK056A_STR-TRDAYS sy-vline 
WA_TFK056A_STR-IRUNITR sy-vline 
WA_TFK056A_STR-IRHYTH sy-vline 
WA_TFK056A_STR-IRUNIT sy-vline 
WA_TFK056A_STR-IRULE sy-vline 
WA_TFK056A_STR-HVORG sy-vline 
WA_TFK056A_STR-TVORG sy-vline 
WA_TFK056A_STR-VERZZP sy-vline 
WA_TFK056A_STR-VERZWE sy-vline 
WA_TFK056A_STR-ICOND sy-vline 
WA_TFK056A_STR-IALLZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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