ABAP Select data from SAP table FKK_RULES into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FKK_RULES
*  INTO TABLE @DATA(IT_FKK_RULES2).
*--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_FKK_RULES INDEX 1 INTO DATA(WA_FKK_RULES2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FKK_RULES>-BUKRS = 1.
<FKK_RULES>-RULES = 1.
<FKK_RULES>-ACTID = 1.
<FKK_RULES>-FVAID = 1.
<FKK_RULES>-ACFCT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FKK_RULES-XFKEY, sy-vline,
  WA_FKK_RULES-XFSEL, sy-vline,
  WA_FKK_RULES-XFEDT, sy-vline,
  WA_FKK_RULES-GRUPP, sy-vline,
  WA_FKK_RULES-XAKTV, sy-vline,
  WA_FKK_RULES-XFCRE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FKK_RULES 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_FKK_RULES 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_FKK_RULES INTO WA_FKK_RULES.


*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_FKK_RULES_STR, 
BUKRS TYPE STRING,
RULES TYPE STRING,
ACTID TYPE STRING,
FVAID TYPE STRING,
ACFCT TYPE STRING,
XFKEY TYPE STRING,
XFSEL TYPE STRING,
XFEDT TYPE STRING,
GRUPP TYPE STRING,
XAKTV TYPE STRING,
XFCRE TYPE STRING,
XFCHA TYPE STRING,
XFDEL TYPE STRING,
XFUPD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FKK_RULES_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_FKK_RULES_STR-BUKRS sy-vline 
WA_FKK_RULES_STR-RULES sy-vline 
WA_FKK_RULES_STR-ACTID sy-vline 
WA_FKK_RULES_STR-FVAID sy-vline 
WA_FKK_RULES_STR-ACFCT sy-vline 
WA_FKK_RULES_STR-XFKEY sy-vline 
WA_FKK_RULES_STR-XFSEL sy-vline 
WA_FKK_RULES_STR-XFEDT sy-vline 
WA_FKK_RULES_STR-GRUPP sy-vline 
WA_FKK_RULES_STR-XAKTV sy-vline 
WA_FKK_RULES_STR-XFCRE sy-vline 
WA_FKK_RULES_STR-XFCHA sy-vline 
WA_FKK_RULES_STR-XFDEL sy-vline 
WA_FKK_RULES_STR-XFUPD sy-vline      INTO ld_text SEPARATED BY SPACE.

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