ABAP Select data from SAP table WWS_ZWB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WWS_ZWB
*  INTO TABLE @DATA(IT_WWS_ZWB2).
*--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_WWS_ZWB INDEX 1 INTO DATA(WA_WWS_ZWB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WWS_ZWB>-WERKS = 1.
<WWS_ZWB>-LGORT = 1.
<WWS_ZWB>-LOCNR = 1.
<WWS_ZWB>-LAYVR = 1.
<WWS_ZWB>-KOPRO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WWS_ZWB-POSDEX, sy-vline,
  WA_WWS_ZWB-SPRAS, sy-vline,
  WA_WWS_ZWB-NAME1, sy-vline,
  WA_WWS_ZWB-NAME2, sy-vline,
  WA_WWS_ZWB-BWKEY, sy-vline,
  WA_WWS_ZWB-BUKRS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WWS_ZWB 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_WWS_ZWB 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_WWS_ZWB INTO WA_WWS_ZWB.


*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 LOCNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WWS_ZWB-LOCNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WWS_ZWB-LOCNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_WWS_ZWB-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WWS_ZWB-SPRAS.
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_WWS_ZWB_STR, 
WERKS TYPE STRING,
LGORT TYPE STRING,
LOCNR TYPE STRING,
LAYVR TYPE STRING,
KOPRO TYPE STRING,
POSDEX TYPE STRING,
SPRAS TYPE STRING,
NAME1 TYPE STRING,
NAME2 TYPE STRING,
BWKEY TYPE STRING,
BUKRS TYPE STRING,
WAERS TYPE STRING,
ISOCD TYPE STRING,
LGOBE TYPE STRING,
ERROR TYPE STRING,
LAY_EXISTS TYPE STRING,
FHANDL TYPE STRING,
IDOCTYP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WWS_ZWB_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_WWS_ZWB_STR-WERKS sy-vline 
WA_WWS_ZWB_STR-LGORT sy-vline 
WA_WWS_ZWB_STR-LOCNR sy-vline 
WA_WWS_ZWB_STR-LAYVR sy-vline 
WA_WWS_ZWB_STR-KOPRO sy-vline 
WA_WWS_ZWB_STR-POSDEX sy-vline 
WA_WWS_ZWB_STR-SPRAS sy-vline 
WA_WWS_ZWB_STR-NAME1 sy-vline 
WA_WWS_ZWB_STR-NAME2 sy-vline 
WA_WWS_ZWB_STR-BWKEY sy-vline 
WA_WWS_ZWB_STR-BUKRS sy-vline 
WA_WWS_ZWB_STR-WAERS sy-vline 
WA_WWS_ZWB_STR-ISOCD sy-vline 
WA_WWS_ZWB_STR-LGOBE sy-vline 
WA_WWS_ZWB_STR-ERROR sy-vline 
WA_WWS_ZWB_STR-LAY_EXISTS sy-vline 
WA_WWS_ZWB_STR-FHANDL sy-vline 
WA_WWS_ZWB_STR-IDOCTYP sy-vline      INTO ld_text SEPARATED BY SPACE.

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