ABAP Select data from SAP table WLF_HILIST_RL_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_HILIST_RL_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_HILIST_RL_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_HILIST_RL_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_HILIST_RL_HEAD TYPE STANDARD TABLE OF WLF_HILIST_RL_HEAD,
      WA_WLF_HILIST_RL_HEAD TYPE WLF_HILIST_RL_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_HILIST_RL_HEAD> TYPE WLF_HILIST_RL_HEAD.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WLF_HILIST_RL_HEAD
*  INTO TABLE @DATA(IT_WLF_HILIST_RL_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_HILIST_RL_HEAD INDEX 1 INTO DATA(WA_WLF_HILIST_RL_HEAD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WLF_HILIST_RL_HEAD>-WBELN = 1.
<WLF_HILIST_RL_HEAD>-LFART = 1.
<WLF_HILIST_RL_HEAD>-LFART_TXT = 1.
<WLF_HILIST_RL_HEAD>-WFDAT = 1.
<WLF_HILIST_RL_HEAD>-BLDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WLF_HILIST_RL_HEAD-RL_PARTNER, sy-vline,
  WA_WLF_HILIST_RL_HEAD-RL_PARTNER_NAME1, sy-vline,
  WA_WLF_HILIST_RL_HEAD-KOART, sy-vline,
  WA_WLF_HILIST_RL_HEAD-ZTERM, sy-vline,
  WA_WLF_HILIST_RL_HEAD-ZBD1T, sy-vline,
  WA_WLF_HILIST_RL_HEAD-ZBD1P, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WLF_HILIST_RL_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_HILIST_RL_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_HILIST_RL_HEAD INTO WA_WLF_HILIST_RL_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 WBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WLF_HILIST_RL_HEAD-WBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLF_HILIST_RL_HEAD-WBELN.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field ADRNR_AZ
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WLF_HILIST_RL_HEAD-ADRNR_AZ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLF_HILIST_RL_HEAD-ADRNR_AZ.
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_RL_HEAD_STR, 
WBELN TYPE STRING,
LFART TYPE STRING,
LFART_TXT TYPE STRING,
WFDAT TYPE STRING,
BLDAT TYPE STRING,
RL_PARTNER TYPE STRING,
RL_PARTNER_NAME1 TYPE STRING,
KOART TYPE STRING,
ZTERM TYPE STRING,
ZBD1T TYPE STRING,
ZBD1P TYPE STRING,
ZBD2T TYPE STRING,
ZBD2P TYPE STRING,
ZBD3T TYPE STRING,
VALDT TYPE STRING,
VALTG TYPE STRING,
EKORG TYPE STRING,
EKGRP TYPE STRING,
BUKRS TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
WAERL TYPE STRING,
RFBSK TYPE STRING,
RFBSK_TXT TYPE STRING,
LFTYP TYPE STRING,
LFTYP_TXT TYPE STRING,
XBLNR TYPE STRING,
ZUONR TYPE STRING,
KIDNO TYPE STRING,
ERDAT TYPE STRING,
ERZET TYPE STRING,
ERNAM TYPE STRING,
ARCHIV TYPE STRING,
SELKZ TYPE STRING,
WDTYP TYPE STRING,
WDTYP_TXT TYPE STRING,
LIFNR_FI TYPE STRING,
LIFNR_FI_NAME1 TYPE STRING,
ADRNR_RE TYPE STRING,
ADDR_TYPE_RE TYPE STRING,
ADRNP_RE TYPE STRING,
ADRNR_RS TYPE STRING,
ADRNR_RG TYPE STRING,
ADRNR_AZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WLF_HILIST_RL_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_HILIST_RL_HEAD_STR-WBELN sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-LFART sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-LFART_TXT sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-WFDAT sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-BLDAT sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-RL_PARTNER sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-RL_PARTNER_NAME1 sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-KOART sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-ZTERM sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-ZBD1T sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-ZBD1P sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-ZBD2T sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-ZBD2P sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-ZBD3T sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-VALDT sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-VALTG sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-EKORG sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-EKGRP sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-BUKRS sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-VKORG sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-VTWEG sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-SPART sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-WAERL sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-RFBSK sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-RFBSK_TXT sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-LFTYP sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-LFTYP_TXT sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-XBLNR sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-ZUONR sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-KIDNO sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-ERDAT sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-ERZET sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-ERNAM sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-ARCHIV sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-SELKZ sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-WDTYP sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-WDTYP_TXT sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-LIFNR_FI sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-LIFNR_FI_NAME1 sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-ADRNR_RE sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-ADDR_TYPE_RE sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-ADRNP_RE sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-ADRNR_RS sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-ADRNR_RG sy-vline 
WA_WLF_HILIST_RL_HEAD_STR-ADRNR_AZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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