ABAP Select data from SAP table WDLS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WDLS
*  INTO TABLE @DATA(IT_WDLS2).
*--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_WDLS INDEX 1 INTO DATA(WA_WDLS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WDLS>-MANDT = 1.
<WDLS>-DLDNR = 1.
<WDLS>-ERZDT = 1.
<WDLS>-ERZZT = 1.
<WDLS>-EMPFN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WDLS-SYSTP, sy-vline,
  WA_WDLS-ERSAB, sy-vline,
  WA_WDLS-ERSBI, sy-vline,
  WA_WDLS-ERZAB, sy-vline,
  WA_WDLS-ERZBI, sy-vline,
  WA_WDLS-DLMOD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WDLS 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_WDLS 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_WDLS INTO WA_WDLS.


*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 EMPFN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WDLS-EMPFN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WDLS-EMPFN.
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_WDLS_STR, 
MANDT TYPE STRING,
DLDNR TYPE STRING,
ERZDT TYPE STRING,
ERZZT TYPE STRING,
EMPFN TYPE STRING,
SYSTP TYPE STRING,
ERSAB TYPE STRING,
ERSBI TYPE STRING,
ERZAB TYPE STRING,
ERZBI TYPE STRING,
DLMOD TYPE STRING,
ANZID TYPE STRING,
EERZT TYPE STRING,
GESST TYPE STRING,
VSEST TYPE STRING,
DATBI TYPE STRING,
SBTYP TYPE STRING,
VFLG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WDLS_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_WDLS_STR-MANDT sy-vline 
WA_WDLS_STR-DLDNR sy-vline 
WA_WDLS_STR-ERZDT sy-vline 
WA_WDLS_STR-ERZZT sy-vline 
WA_WDLS_STR-EMPFN sy-vline 
WA_WDLS_STR-SYSTP sy-vline 
WA_WDLS_STR-ERSAB sy-vline 
WA_WDLS_STR-ERSBI sy-vline 
WA_WDLS_STR-ERZAB sy-vline 
WA_WDLS_STR-ERZBI sy-vline 
WA_WDLS_STR-DLMOD sy-vline 
WA_WDLS_STR-ANZID sy-vline 
WA_WDLS_STR-EERZT sy-vline 
WA_WDLS_STR-GESST sy-vline 
WA_WDLS_STR-VSEST sy-vline 
WA_WDLS_STR-DATBI sy-vline 
WA_WDLS_STR-SBTYP sy-vline 
WA_WDLS_STR-VFLG sy-vline      INTO ld_text SEPARATED BY SPACE.

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