ABAP Select data from SAP table WLOVD_KK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WLOVD_KK
*  INTO TABLE @DATA(IT_WLOVD_KK2).
*--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_WLOVD_KK INDEX 1 INTO DATA(WA_WLOVD_KK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WLOVD_KK>-GENERATED_ID = 1.
<WLOVD_KK>-BETRW = 1.
<WLOVD_KK>-BALANCE = 1.
<WLOVD_KK>-DEBITS = 1.
<WLOVD_KK>-CREDITS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WLOVD_KK-WL_STATE, sy-vline,
  WA_WLOVD_KK-WL_CRDAT, sy-vline,
  WA_WLOVD_KK-WL_CRTIM, sy-vline,
  WA_WLOVD_KK-GPART, sy-vline,
  WA_WLOVD_KK-OPBEL, sy-vline,
  WA_WLOVD_KK-OPUPW, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WLOVD_KK 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_WLOVD_KK 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_WLOVD_KK INTO WA_WLOVD_KK.


*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 GPART
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WLOVD_KK-GPART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLOVD_KK-GPART.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field OPBEL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WLOVD_KK-OPBEL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLOVD_KK-OPBEL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SEGMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WLOVD_KK-SEGMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLOVD_KK-SEGMENT.
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_WLOVD_KK_STR, 
GENERATED_ID TYPE STRING,
BETRW TYPE STRING,
BALANCE TYPE STRING,
DEBITS TYPE STRING,
CREDITS TYPE STRING,
WL_STATE TYPE STRING,
WL_CRDAT TYPE STRING,
WL_CRTIM TYPE STRING,
GPART TYPE STRING,
OPBEL TYPE STRING,
OPUPW TYPE STRING,
OPUPK TYPE STRING,
OPUPZ TYPE STRING,
NAME_LAST TYPE STRING,
NAME_FIRST TYPE STRING,
WAERS TYPE STRING,
GROUPBY TYPE STRING,
BUKRS TYPE STRING,
FAEDN TYPE STRING,
GSBER TYPE STRING,
HVORG TYPE STRING,
INFOZ TYPE STRING,
OPNUMBER TYPE STRING,
SEGMENT TYPE STRING,
VKTYP TYPE STRING,
MAHNV TYPE STRING,
STRAT TYPE STRING,
AUSDT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WLOVD_KK_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_WLOVD_KK_STR-GENERATED_ID sy-vline 
WA_WLOVD_KK_STR-BETRW sy-vline 
WA_WLOVD_KK_STR-BALANCE sy-vline 
WA_WLOVD_KK_STR-DEBITS sy-vline 
WA_WLOVD_KK_STR-CREDITS sy-vline 
WA_WLOVD_KK_STR-WL_STATE sy-vline 
WA_WLOVD_KK_STR-WL_CRDAT sy-vline 
WA_WLOVD_KK_STR-WL_CRTIM sy-vline 
WA_WLOVD_KK_STR-GPART sy-vline 
WA_WLOVD_KK_STR-OPBEL sy-vline 
WA_WLOVD_KK_STR-OPUPW sy-vline 
WA_WLOVD_KK_STR-OPUPK sy-vline 
WA_WLOVD_KK_STR-OPUPZ sy-vline 
WA_WLOVD_KK_STR-NAME_LAST sy-vline 
WA_WLOVD_KK_STR-NAME_FIRST sy-vline 
WA_WLOVD_KK_STR-WAERS sy-vline 
WA_WLOVD_KK_STR-GROUPBY sy-vline 
WA_WLOVD_KK_STR-BUKRS sy-vline 
WA_WLOVD_KK_STR-FAEDN sy-vline 
WA_WLOVD_KK_STR-GSBER sy-vline 
WA_WLOVD_KK_STR-HVORG sy-vline 
WA_WLOVD_KK_STR-INFOZ sy-vline 
WA_WLOVD_KK_STR-OPNUMBER sy-vline 
WA_WLOVD_KK_STR-SEGMENT sy-vline 
WA_WLOVD_KK_STR-VKTYP sy-vline 
WA_WLOVD_KK_STR-MAHNV sy-vline 
WA_WLOVD_KK_STR-STRAT sy-vline 
WA_WLOVD_KK_STR-AUSDT sy-vline      INTO ld_text SEPARATED BY SPACE.

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