ABAP Select data from SAP table WPLST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WPLST
*  INTO TABLE @DATA(IT_WPLST2).
*--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_WPLST INDEX 1 INTO DATA(WA_WPLST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WPLST>-MANDT = 1.
<WPLST>-DOCNUM = 1.
<WPLST>-SEGNUM = 1.
<WPLST>-MSGNR = 1.
<WPLST>-MSGID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WPLST-LFDNR, sy-vline,
  WA_WPLST-PARAMETER1, sy-vline,
  WA_WPLST-PARAMETER2, sy-vline,
  WA_WPLST-PARAMETER3, sy-vline,
  WA_WPLST-PARAMETER4, sy-vline,
  WA_WPLST-FILIALE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WPLST 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_WPLST 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_WPLST INTO WA_WPLST.


*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 FILIALE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WPLST-FILIALE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WPLST-FILIALE.
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_WPLST_STR, 
MANDT TYPE STRING,
DOCNUM TYPE STRING,
SEGNUM TYPE STRING,
MSGNR TYPE STRING,
MSGID TYPE STRING,
LFDNR TYPE STRING,
PARAMETER1 TYPE STRING,
PARAMETER2 TYPE STRING,
PARAMETER3 TYPE STRING,
PARAMETER4 TYPE STRING,
FILIALE TYPE STRING,
ERZDT TYPE STRING,
FEHLERTYP TYPE STRING,
DOCTYP TYPE STRING,
FUNCTION TYPE STRING,
SEGNAM TYPE STRING,
PROGLOKALI TYPE STRING,
REFNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WPLST_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_WPLST_STR-MANDT sy-vline 
WA_WPLST_STR-DOCNUM sy-vline 
WA_WPLST_STR-SEGNUM sy-vline 
WA_WPLST_STR-MSGNR sy-vline 
WA_WPLST_STR-MSGID sy-vline 
WA_WPLST_STR-LFDNR sy-vline 
WA_WPLST_STR-PARAMETER1 sy-vline 
WA_WPLST_STR-PARAMETER2 sy-vline 
WA_WPLST_STR-PARAMETER3 sy-vline 
WA_WPLST_STR-PARAMETER4 sy-vline 
WA_WPLST_STR-FILIALE sy-vline 
WA_WPLST_STR-ERZDT sy-vline 
WA_WPLST_STR-FEHLERTYP sy-vline 
WA_WPLST_STR-DOCTYP sy-vline 
WA_WPLST_STR-FUNCTION sy-vline 
WA_WPLST_STR-SEGNAM sy-vline 
WA_WPLST_STR-PROGLOKALI sy-vline 
WA_WPLST_STR-REFNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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