ABAP Select data from SAP table WLF_IV_HELP_HEAD into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WLF_IV_HELP_HEAD 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_IV_HELP_HEAD. 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_IV_HELP_HEAD 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_IV_HELP_HEAD TYPE STANDARD TABLE OF WLF_IV_HELP_HEAD,
      WA_WLF_IV_HELP_HEAD TYPE WLF_IV_HELP_HEAD,
      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_IV_HELP_HEAD> TYPE WLF_IV_HELP_HEAD.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WLF_IV_HELP_HEAD
*  INTO TABLE @DATA(IT_WLF_IV_HELP_HEAD2).
*--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_IV_HELP_HEAD INDEX 1 INTO DATA(WA_WLF_IV_HELP_HEAD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WLF_IV_HELP_HEAD>-STATUS = 1.
<WLF_IV_HELP_HEAD>-BUKRS = 1.
<WLF_IV_HELP_HEAD>-RRLCG = 1.
<WLF_IV_HELP_HEAD>-RRLREC = 1.
<WLF_IV_HELP_HEAD>-RRLREC_NAME1 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WLF_IV_HELP_HEAD-GJAHR, sy-vline,
  WA_WLF_IV_HELP_HEAD-WFDAT, sy-vline,
  WA_WLF_IV_HELP_HEAD-WAERL_IV, sy-vline,
  WA_WLF_IV_HELP_HEAD-XBLNR, sy-vline,
  WA_WLF_IV_HELP_HEAD-LFART_VL, sy-vline,
  WA_WLF_IV_HELP_HEAD-LFART_VL_VTEXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WLF_IV_HELP_HEAD 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_IV_HELP_HEAD 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_IV_HELP_HEAD INTO WA_WLF_IV_HELP_HEAD.


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

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

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_WLF_IV_HELP_HEAD-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLF_IV_HELP_HEAD-GJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RRLREC_SINGLE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WLF_IV_HELP_HEAD-RRLREC_SINGLE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLF_IV_HELP_HEAD-RRLREC_SINGLE.
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_IV_HELP_HEAD_STR, 
STATUS TYPE STRING,
BUKRS TYPE STRING,
RRLCG TYPE STRING,
RRLREC TYPE STRING,
RRLREC_NAME1 TYPE STRING,
GJAHR TYPE STRING,
WFDAT TYPE STRING,
WAERL_IV TYPE STRING,
XBLNR TYPE STRING,
LFART_VL TYPE STRING,
LFART_VL_VTEXT TYPE STRING,
ICON_POS TYPE STRING,
TOLERANCE_EXP TYPE STRING,
ICON_NEG TYPE STRING,
TOLERANCE_REV TYPE STRING,
DIFFERENCE TYPE STRING,
WFDAT_AB TYPE STRING,
WFDAT_BI TYPE STRING,
PROCESS_ID TYPE STRING,
MODE TYPE STRING,
WDTYP_IV TYPE STRING,
TREE_TYPE TYPE STRING,
NODE_TYPE TYPE STRING,
RRLPA TYPE STRING,
CPROG TYPE STRING,
SHOW_TREE_HISTORY TYPE STRING,
POSTED TYPE STRING,
NO_REFRESH_CONTEXT TYPE STRING,
RRLREC_SINGLE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WLF_IV_HELP_HEAD_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_IV_HELP_HEAD_STR-STATUS sy-vline 
WA_WLF_IV_HELP_HEAD_STR-BUKRS sy-vline 
WA_WLF_IV_HELP_HEAD_STR-RRLCG sy-vline 
WA_WLF_IV_HELP_HEAD_STR-RRLREC sy-vline 
WA_WLF_IV_HELP_HEAD_STR-RRLREC_NAME1 sy-vline 
WA_WLF_IV_HELP_HEAD_STR-GJAHR sy-vline 
WA_WLF_IV_HELP_HEAD_STR-WFDAT sy-vline 
WA_WLF_IV_HELP_HEAD_STR-WAERL_IV sy-vline 
WA_WLF_IV_HELP_HEAD_STR-XBLNR sy-vline 
WA_WLF_IV_HELP_HEAD_STR-LFART_VL sy-vline 
WA_WLF_IV_HELP_HEAD_STR-LFART_VL_VTEXT sy-vline 
WA_WLF_IV_HELP_HEAD_STR-ICON_POS sy-vline 
WA_WLF_IV_HELP_HEAD_STR-TOLERANCE_EXP sy-vline 
WA_WLF_IV_HELP_HEAD_STR-ICON_NEG sy-vline 
WA_WLF_IV_HELP_HEAD_STR-TOLERANCE_REV sy-vline 
WA_WLF_IV_HELP_HEAD_STR-DIFFERENCE sy-vline 
WA_WLF_IV_HELP_HEAD_STR-WFDAT_AB sy-vline 
WA_WLF_IV_HELP_HEAD_STR-WFDAT_BI sy-vline 
WA_WLF_IV_HELP_HEAD_STR-PROCESS_ID sy-vline 
WA_WLF_IV_HELP_HEAD_STR-MODE sy-vline 
WA_WLF_IV_HELP_HEAD_STR-WDTYP_IV sy-vline 
WA_WLF_IV_HELP_HEAD_STR-TREE_TYPE sy-vline 
WA_WLF_IV_HELP_HEAD_STR-NODE_TYPE sy-vline 
WA_WLF_IV_HELP_HEAD_STR-RRLPA sy-vline 
WA_WLF_IV_HELP_HEAD_STR-CPROG sy-vline 
WA_WLF_IV_HELP_HEAD_STR-SHOW_TREE_HISTORY sy-vline 
WA_WLF_IV_HELP_HEAD_STR-POSTED sy-vline 
WA_WLF_IV_HELP_HEAD_STR-NO_REFRESH_CONTEXT sy-vline 
WA_WLF_IV_HELP_HEAD_STR-RRLREC_SINGLE sy-vline      INTO ld_text SEPARATED BY SPACE.

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