ABAP Select data from SAP table WLF_S_LFART_CHECK_FIELDS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WLF_S_LFART_CHECK_FIELDS 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_S_LFART_CHECK_FIELDS. 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_S_LFART_CHECK_FIELDS 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_S_LFART_CHECK_FIELDS TYPE STANDARD TABLE OF WLF_S_LFART_CHECK_FIELDS,
      WA_WLF_S_LFART_CHECK_FIELDS TYPE WLF_S_LFART_CHECK_FIELDS,
      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_S_LFART_CHECK_FIELDS> TYPE WLF_S_LFART_CHECK_FIELDS.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WLF_S_LFART_CHECK_FIELDS
*  INTO TABLE @DATA(IT_WLF_S_LFART_CHECK_FIELDS2).
*--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_S_LFART_CHECK_FIELDS INDEX 1 INTO DATA(WA_WLF_S_LFART_CHECK_FIELDS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WLF_S_LFART_CHECK_FIELDS>-PARGK = 1.
<WLF_S_LFART_CHECK_FIELDS>-PARGP = 1.
<WLF_S_LFART_CHECK_FIELDS>-WERKM = 1.
<WLF_S_LFART_CHECK_FIELDS>-INFOL = 1.
<WLF_S_LFART_CHECK_FIELDS>-TXTGR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WLF_S_LFART_CHECK_FIELDS-TXTGR_I, sy-vline,
  WA_WLF_S_LFART_CHECK_FIELDS-WERN, sy-vline,
  WA_WLF_S_LFART_CHECK_FIELDS-RRLTAX, sy-vline,
  WA_WLF_S_LFART_CHECK_FIELDS-BILLTOPARTY, sy-vline,
  WA_WLF_S_LFART_CHECK_FIELDS-BILLFROMPARTY, sy-vline,
  WA_WLF_S_LFART_CHECK_FIELDS-FI_CA_ACTIVE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WLF_S_LFART_CHECK_FIELDS 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_S_LFART_CHECK_FIELDS 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_S_LFART_CHECK_FIELDS INTO WA_WLF_S_LFART_CHECK_FIELDS.


*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 PARVW, internal->external for field BILLTOPARTY
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_WLF_S_LFART_CHECK_FIELDS-BILLTOPARTY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLF_S_LFART_CHECK_FIELDS-BILLTOPARTY.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PARVW, internal->external for field BILLFROMPARTY
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_WLF_S_LFART_CHECK_FIELDS-BILLFROMPARTY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLF_S_LFART_CHECK_FIELDS-BILLFROMPARTY.
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_S_LFART_CHECK_FIELDS_STR, 
PARGK TYPE STRING,
PARGP TYPE STRING,
WERKM TYPE STRING,
INFOL TYPE STRING,
TXTGR TYPE STRING,
TXTGR_I TYPE STRING,
WERN TYPE STRING,
RRLTAX TYPE STRING,
BILLTOPARTY TYPE STRING,
BILLFROMPARTY TYPE STRING,
FI_CA_ACTIVE TYPE STRING,
KTOSL_VE TYPE STRING,
KTOSL_VE_CUST TYPE STRING,
KTOSL_MG TYPE STRING,
KTOSL_VM TYPE STRING,
KTOSL_ACC TYPE STRING,
CHECK_WFDAT TYPE STRING,
ITEM_CANCEL TYPE STRING,
BW_DELTA TYPE STRING,
STATI TYPE STRING,
KAPPL TYPE STRING,
PRCHGRP TYPE STRING,
EFFWR_NEG TYPE STRING,
POSNR_MAIN_ACTIV TYPE STRING,
ACC_DETERM_TYPE TYPE STRING,
CALC_PYAMT TYPE STRING,
DOC_INDEX_TYPE TYPE STRING,
PRICING_COMP_K TYPE STRING,
PRICING_COMP_D TYPE STRING,
CHECK_AP_RG TYPE STRING,
NO_INPUT TYPE STRING,
INTRASTAT_PROC TYPE STRING,
INTRASTAT_FLOW TYPE STRING,
NETWN TYPE STRING,
KSTAT_ACCOUNT TYPE STRING,
TAXCODE_ALLOWED TYPE STRING,
ZTERM_CASH_DISC TYPE STRING,
CASH_MANAGEMENT_INACTIVE TYPE STRING,
KUNNR_COPA TYPE STRING,
MATERIAL_VALID_CHECK TYPE STRING,
LFTYP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WLF_S_LFART_CHECK_FIELDS_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_S_LFART_CHECK_FIELDS_STR-PARGK sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-PARGP sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-WERKM sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-INFOL sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-TXTGR sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-TXTGR_I sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-WERN sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-RRLTAX sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-BILLTOPARTY sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-BILLFROMPARTY sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-FI_CA_ACTIVE sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-KTOSL_VE sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-KTOSL_VE_CUST sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-KTOSL_MG sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-KTOSL_VM sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-KTOSL_ACC sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-CHECK_WFDAT sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-ITEM_CANCEL sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-BW_DELTA sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-STATI sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-KAPPL sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-PRCHGRP sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-EFFWR_NEG sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-POSNR_MAIN_ACTIV sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-ACC_DETERM_TYPE sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-CALC_PYAMT sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-DOC_INDEX_TYPE sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-PRICING_COMP_K sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-PRICING_COMP_D sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-CHECK_AP_RG sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-NO_INPUT sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-INTRASTAT_PROC sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-INTRASTAT_FLOW sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-NETWN sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-KSTAT_ACCOUNT sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-TAXCODE_ALLOWED sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-ZTERM_CASH_DISC sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-CASH_MANAGEMENT_INACTIVE sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-KUNNR_COPA sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-MATERIAL_VALID_CHECK sy-vline 
WA_WLF_S_LFART_CHECK_FIELDS_STR-LFTYP sy-vline      INTO ld_text SEPARATED BY SPACE.

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