ABAP Select data from SAP table WDL_ALW into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WDL_ALW
*  INTO TABLE @DATA(IT_WDL_ALW2).
*--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_WDL_ALW INDEX 1 INTO DATA(WA_WDL_ALW2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WDL_ALW>-MATNR = 1.
<WDL_ALW>-BBTYP = 1.
<WDL_ALW>-MTART = 1.
<WDL_ALW>-ATTYP = 1.
<WDL_ALW>-MATKL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WDL_ALW-SATNR, sy-vline,
  WA_WDL_ALW-ABTNR, sy-vline,
  WA_WDL_ALW-LAYVR, sy-vline,
  WA_WDL_ALW-LNLGV, sy-vline,
  WA_WDL_ALW-LAYGR, sy-vline,
  WA_WDL_ALW-LMVER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WDL_ALW 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_WDL_ALW 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_WDL_ALW INTO WA_WDL_ALW.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_WDL_ALW-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WDL_ALW-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field SATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_WDL_ALW-SATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WDL_ALW-SATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MELAY
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WDL_ALW-MELAY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WDL_ALW-MELAY.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit CUNIT, internal->external for field CHGME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WDL_ALW-CHGME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WDL_ALW-CHGME.
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_WDL_ALW_STR, 
MATNR TYPE STRING,
BBTYP TYPE STRING,
MTART TYPE STRING,
ATTYP TYPE STRING,
MATKL TYPE STRING,
SATNR TYPE STRING,
ABTNR TYPE STRING,
LAYVR TYPE STRING,
LNLGV TYPE STRING,
LAYGR TYPE STRING,
LMVER TYPE STRING,
LMVAR TYPE STRING,
SORF1 TYPE STRING,
FACIN TYPE STRING,
SHELF TYPE STRING,
MEVOR TYPE STRING,
MELAY TYPE STRING,
HPLGR TYPE STRING,
LIFNR TYPE STRING,
INFNR TYPE STRING,
LTSNR TYPE STRING,
LTSSF TYPE STRING,
NRLIF TYPE STRING,
AKTIO TYPE STRING,
NEWGR TYPE STRING,
BBFLAG TYPE STRING,
SORT2 TYPE STRING,
DATAB TYPE STRING,
DATBI TYPE STRING,
CDCHGID TYPE STRING,
CHTAB TYPE STRING,
FLDNAME TYPE STRING,
TABKEY TYPE STRING,
LABRL TYPE STRING,
CHGME TYPE STRING,
ACTTIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WDL_ALW_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_WDL_ALW_STR-MATNR sy-vline 
WA_WDL_ALW_STR-BBTYP sy-vline 
WA_WDL_ALW_STR-MTART sy-vline 
WA_WDL_ALW_STR-ATTYP sy-vline 
WA_WDL_ALW_STR-MATKL sy-vline 
WA_WDL_ALW_STR-SATNR sy-vline 
WA_WDL_ALW_STR-ABTNR sy-vline 
WA_WDL_ALW_STR-LAYVR sy-vline 
WA_WDL_ALW_STR-LNLGV sy-vline 
WA_WDL_ALW_STR-LAYGR sy-vline 
WA_WDL_ALW_STR-LMVER sy-vline 
WA_WDL_ALW_STR-LMVAR sy-vline 
WA_WDL_ALW_STR-SORF1 sy-vline 
WA_WDL_ALW_STR-FACIN sy-vline 
WA_WDL_ALW_STR-SHELF sy-vline 
WA_WDL_ALW_STR-MEVOR sy-vline 
WA_WDL_ALW_STR-MELAY sy-vline 
WA_WDL_ALW_STR-HPLGR sy-vline 
WA_WDL_ALW_STR-LIFNR sy-vline 
WA_WDL_ALW_STR-INFNR sy-vline 
WA_WDL_ALW_STR-LTSNR sy-vline 
WA_WDL_ALW_STR-LTSSF sy-vline 
WA_WDL_ALW_STR-NRLIF sy-vline 
WA_WDL_ALW_STR-AKTIO sy-vline 
WA_WDL_ALW_STR-NEWGR sy-vline 
WA_WDL_ALW_STR-BBFLAG sy-vline 
WA_WDL_ALW_STR-SORT2 sy-vline 
WA_WDL_ALW_STR-DATAB sy-vline 
WA_WDL_ALW_STR-DATBI sy-vline 
WA_WDL_ALW_STR-CDCHGID sy-vline 
WA_WDL_ALW_STR-CHTAB sy-vline 
WA_WDL_ALW_STR-FLDNAME sy-vline 
WA_WDL_ALW_STR-TABKEY sy-vline 
WA_WDL_ALW_STR-LABRL sy-vline 
WA_WDL_ALW_STR-CHGME sy-vline 
WA_WDL_ALW_STR-ACTTIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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