ABAP Select data from SAP table FKKBUE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FKKBUE
*  INTO TABLE @DATA(IT_FKKBUE2).
*--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_FKKBUE INDEX 1 INTO DATA(WA_FKKBUE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FKKBUE>-MANDT = 1.
<FKKBUE>-RUNID = 1.
<FKKBUE>-FNAME = 1.
<FKKBUE>-UNAME = 1.
<FKKBUE>-DATUM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FKKBUE-UZEIT, sy-vline,
  WA_FKKBUE-ERRDOC, sy-vline,
  WA_FKKBUE-ECLUST, sy-vline,
  WA_FKKBUE-BELFIN, sy-vline,
  WA_FKKBUE-LINFIN, sy-vline,
  WA_FKKBUE-XFIN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FKKBUE 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_FKKBUE 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_FKKBUE INTO WA_FKKBUE.


*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_FKKBUE_STR, 
MANDT TYPE STRING,
RUNID TYPE STRING,
FNAME TYPE STRING,
UNAME TYPE STRING,
DATUM TYPE STRING,
UZEIT TYPE STRING,
ERRDOC TYPE STRING,
ECLUST TYPE STRING,
BELFIN TYPE STRING,
LINFIN TYPE STRING,
XFIN TYPE STRING,
XCLDEL TYPE STRING,
XLOCAL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FKKBUE_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_FKKBUE_STR-MANDT sy-vline 
WA_FKKBUE_STR-RUNID sy-vline 
WA_FKKBUE_STR-FNAME sy-vline 
WA_FKKBUE_STR-UNAME sy-vline 
WA_FKKBUE_STR-DATUM sy-vline 
WA_FKKBUE_STR-UZEIT sy-vline 
WA_FKKBUE_STR-ERRDOC sy-vline 
WA_FKKBUE_STR-ECLUST sy-vline 
WA_FKKBUE_STR-BELFIN sy-vline 
WA_FKKBUE_STR-LINFIN sy-vline 
WA_FKKBUE_STR-XFIN sy-vline 
WA_FKKBUE_STR-XCLDEL sy-vline 
WA_FKKBUE_STR-XLOCAL sy-vline      INTO ld_text SEPARATED BY SPACE.

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