ABAP Select data from SAP table E3WPA02 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP E3WPA02 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 E3WPA02. 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 E3WPA02 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_E3WPA02 TYPE STANDARD TABLE OF E3WPA02,
      WA_E3WPA02 TYPE E3WPA02,
      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: <E3WPA02> TYPE E3WPA02.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_E3WPA02.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM E3WPA02
  INTO TABLE IT_E3WPA02.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM E3WPA02
*  INTO TABLE @DATA(IT_E3WPA022).
*--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_E3WPA02 INDEX 1 INTO DATA(WA_E3WPA022).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_E3WPA02 ASSIGNING <E3WPA02>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<E3WPA02>-WARENGR = 1.
<E3WPA02>-VERPGEW = 1.
<E3WPA02>-WAAGENKR = 1.
<E3WPA02>-MEINPVERB = 1.
<E3WPA02>-VKINPERFOR = 1.

ENDLOOP.

LOOP AT IT_E3WPA02 INTO WA_E3WPA02.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_E3WPA02-VERKSPERRE, sy-vline,
  WA_E3WPA02-RABERLAUBT, sy-vline,
  WA_E3WPA02-WAAGENART, sy-vline,
  WA_E3WPA02-MWSTFLAG, sy-vline,
  WA_E3WPA02-PHOHEITFIL, sy-vline,
  WA_E3WPA02-PRDRUCK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_E3WPA02 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_E3WPA02 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_E3WPA02 INTO WA_E3WPA02.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_E3WPA02_STR, 
WARENGR TYPE STRING,
VERPGEW TYPE STRING,
WAAGENKR TYPE STRING,
MEINPVERB TYPE STRING,
VKINPERFOR TYPE STRING,
VERKSPERRE TYPE STRING,
RABERLAUBT TYPE STRING,
WAAGENART TYPE STRING,
MWSTFLAG TYPE STRING,
PHOHEITFIL TYPE STRING,
PRDRUCK TYPE STRING,
ARTIKANZ TYPE STRING,
MHDRZ TYPE STRING,
MHDHB TYPE STRING,END OF T_EKKO_STR.
DATA: WA_E3WPA02_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_E3WPA02_STR-WARENGR sy-vline 
WA_E3WPA02_STR-VERPGEW sy-vline 
WA_E3WPA02_STR-WAAGENKR sy-vline 
WA_E3WPA02_STR-MEINPVERB sy-vline 
WA_E3WPA02_STR-VKINPERFOR sy-vline 
WA_E3WPA02_STR-VERKSPERRE sy-vline 
WA_E3WPA02_STR-RABERLAUBT sy-vline 
WA_E3WPA02_STR-WAAGENART sy-vline 
WA_E3WPA02_STR-MWSTFLAG sy-vline 
WA_E3WPA02_STR-PHOHEITFIL sy-vline 
WA_E3WPA02_STR-PRDRUCK sy-vline 
WA_E3WPA02_STR-ARTIKANZ sy-vline 
WA_E3WPA02_STR-MHDRZ sy-vline 
WA_E3WPA02_STR-MHDHB sy-vline      INTO ld_text SEPARATED BY SPACE.

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