ABAP Select data from SAP table WLF_HILIST_PL_ITEM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WLF_HILIST_PL_ITEM
*  INTO TABLE @DATA(IT_WLF_HILIST_PL_ITEM2).
*--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_WLF_HILIST_PL_ITEM INDEX 1 INTO DATA(WA_WLF_HILIST_PL_ITEM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WLF_HILIST_PL_ITEM>-POSNR = 1.
<WLF_HILIST_PL_ITEM>-WBELN_LF = 1.
<WLF_HILIST_PL_ITEM>-NETWR = 1.
<WLF_HILIST_PL_ITEM>-MWSBP = 1.
<WLF_HILIST_PL_ITEM>-BRTWR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WLF_HILIST_PL_ITEM-LIFRE, sy-vline,
  WA_WLF_HILIST_PL_ITEM-LIFRE_NAME1, sy-vline,
  WA_WLF_HILIST_PL_ITEM-LNRZB, sy-vline,
  WA_WLF_HILIST_PL_ITEM-LNRZB_NAME1, sy-vline,
  WA_WLF_HILIST_PL_ITEM-NETWR_VZ, sy-vline,
  WA_WLF_HILIST_PL_ITEM-MWSBP_VZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WLF_HILIST_PL_ITEM 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_WLF_HILIST_PL_ITEM 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_WLF_HILIST_PL_ITEM INTO WA_WLF_HILIST_PL_ITEM.


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

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

*Conversion exit ALPHA, internal->external for field LNRZB
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WLF_HILIST_PL_ITEM-LNRZB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLF_HILIST_PL_ITEM-LNRZB.
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_WLF_HILIST_PL_ITEM_STR, 
POSNR TYPE STRING,
WBELN_LF TYPE STRING,
NETWR TYPE STRING,
MWSBP TYPE STRING,
BRTWR TYPE STRING,
LIFRE TYPE STRING,
LIFRE_NAME1 TYPE STRING,
LNRZB TYPE STRING,
LNRZB_NAME1 TYPE STRING,
NETWR_VZ TYPE STRING,
MWSBP_VZ TYPE STRING,
LFTYP_LI TYPE STRING,
LFTYP_LI_TXT TYPE STRING,
BRTWR_VZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WLF_HILIST_PL_ITEM_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_WLF_HILIST_PL_ITEM_STR-POSNR sy-vline 
WA_WLF_HILIST_PL_ITEM_STR-WBELN_LF sy-vline 
WA_WLF_HILIST_PL_ITEM_STR-NETWR sy-vline 
WA_WLF_HILIST_PL_ITEM_STR-MWSBP sy-vline 
WA_WLF_HILIST_PL_ITEM_STR-BRTWR sy-vline 
WA_WLF_HILIST_PL_ITEM_STR-LIFRE sy-vline 
WA_WLF_HILIST_PL_ITEM_STR-LIFRE_NAME1 sy-vline 
WA_WLF_HILIST_PL_ITEM_STR-LNRZB sy-vline 
WA_WLF_HILIST_PL_ITEM_STR-LNRZB_NAME1 sy-vline 
WA_WLF_HILIST_PL_ITEM_STR-NETWR_VZ sy-vline 
WA_WLF_HILIST_PL_ITEM_STR-MWSBP_VZ sy-vline 
WA_WLF_HILIST_PL_ITEM_STR-LFTYP_LI sy-vline 
WA_WLF_HILIST_PL_ITEM_STR-LFTYP_LI_TXT sy-vline 
WA_WLF_HILIST_PL_ITEM_STR-BRTWR_VZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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