ABAP Select data from SAP table WELLEN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WELLEN
*  INTO TABLE @DATA(IT_WELLEN2).
*--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_WELLEN INDEX 1 INTO DATA(WA_WELLEN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WELLEN>-SAMMG = 1.
<WELLEN>-KWPRO = 1.
<WELLEN>-KAPTPROG = 1.
<WELLEN>-BEZEI20 = 1.
<WELLEN>-BEGZT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WELLEN-ENDZT, sy-vline,
  WA_WELLEN-KAP_BESCHR, sy-vline,
  WA_WELLEN-DUNKEL_VER, sy-vline,
  WA_WELLEN-MAXKOMMPOS, sy-vline,
  WA_WELLEN-ANZBP_E, sy-vline,
  WA_WELLEN-MAXAUMETYP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WELLEN 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_WELLEN 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_WELLEN INTO WA_WELLEN.


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

*Conversion exit CUNIT, internal->external for field GEWEH_2
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WELLEN-GEWEH_2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WELLEN-GEWEH_2.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit CUNIT, internal->external for field VOLEH_2
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WELLEN-VOLEH_2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WELLEN-VOLEH_2.
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_WELLEN_STR, 
SAMMG TYPE STRING,
KWPRO TYPE STRING,
KAPTPROG TYPE STRING,
BEZEI20 TYPE STRING,
BEGZT TYPE STRING,
ENDZT TYPE STRING,
KAP_BESCHR TYPE STRING,
DUNKEL_VER TYPE STRING,
MAXKOMMPOS TYPE STRING,
ANZBP_E TYPE STRING,
MAXAUMETYP TYPE STRING,
METYP_E TYPE STRING,
MAXVERHART TYPE STRING,
VHART_E TYPE STRING,
MAXGEWICHT TYPE STRING,
GEWEH TYPE STRING,
MEGEW_E TYPE STRING,
GEWEH_2 TYPE STRING,
MAXVOLUMEN TYPE STRING,
VOLEH TYPE STRING,
MEVOL_E TYPE STRING,
VOLEH_2 TYPE STRING,
MAXZEIT TYPE STRING,
BZEIT_E TYPE STRING,
AMPEL_IK TYPE STRING,
KREUZ TYPE STRING,
EXPAND_KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WELLEN_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_WELLEN_STR-SAMMG sy-vline 
WA_WELLEN_STR-KWPRO sy-vline 
WA_WELLEN_STR-KAPTPROG sy-vline 
WA_WELLEN_STR-BEZEI20 sy-vline 
WA_WELLEN_STR-BEGZT sy-vline 
WA_WELLEN_STR-ENDZT sy-vline 
WA_WELLEN_STR-KAP_BESCHR sy-vline 
WA_WELLEN_STR-DUNKEL_VER sy-vline 
WA_WELLEN_STR-MAXKOMMPOS sy-vline 
WA_WELLEN_STR-ANZBP_E sy-vline 
WA_WELLEN_STR-MAXAUMETYP sy-vline 
WA_WELLEN_STR-METYP_E sy-vline 
WA_WELLEN_STR-MAXVERHART sy-vline 
WA_WELLEN_STR-VHART_E sy-vline 
WA_WELLEN_STR-MAXGEWICHT sy-vline 
WA_WELLEN_STR-GEWEH sy-vline 
WA_WELLEN_STR-MEGEW_E sy-vline 
WA_WELLEN_STR-GEWEH_2 sy-vline 
WA_WELLEN_STR-MAXVOLUMEN sy-vline 
WA_WELLEN_STR-VOLEH sy-vline 
WA_WELLEN_STR-MEVOL_E sy-vline 
WA_WELLEN_STR-VOLEH_2 sy-vline 
WA_WELLEN_STR-MAXZEIT sy-vline 
WA_WELLEN_STR-BZEIT_E sy-vline 
WA_WELLEN_STR-AMPEL_IK sy-vline 
WA_WELLEN_STR-KREUZ sy-vline 
WA_WELLEN_STR-EXPAND_KZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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