ABAP Select data from SAP table VWB2_D_STRING into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP VWB2_D_STRING 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 VWB2_D_STRING. 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 VWB2_D_STRING 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_VWB2_D_STRING TYPE STANDARD TABLE OF VWB2_D_STRING,
      WA_VWB2_D_STRING TYPE VWB2_D_STRING,
      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: <VWB2_D_STRING> TYPE VWB2_D_STRING.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_VWB2_D_STRING.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM VWB2_D_STRING
  INTO TABLE IT_VWB2_D_STRING.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VWB2_D_STRING
*  INTO TABLE @DATA(IT_VWB2_D_STRING2).
*--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_VWB2_D_STRING INDEX 1 INTO DATA(WA_VWB2_D_STRING2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_VWB2_D_STRING ASSIGNING <VWB2_D_STRING>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VWB2_D_STRING>-CLIENT = 1.
<VWB2_D_STRING>-TKONN = 1.
<VWB2_D_STRING>-GUID = 1.
<VWB2_D_STRING>-STRING_ORDER = 1.
<VWB2_D_STRING>-FLAG_FIRST = 1.

ENDLOOP.

LOOP AT IT_VWB2_D_STRING INTO WA_VWB2_D_STRING.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VWB2_D_STRING-VENDOR, sy-vline,
  WA_VWB2_D_STRING-CUSTOMER, sy-vline,
  WA_VWB2_D_STRING-NETPR, sy-vline,
  WA_VWB2_D_STRING-CURR, sy-vline,
  WA_VWB2_D_STRING-PRICING_UNIT, sy-vline,
  WA_VWB2_D_STRING-COND_UNIT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VWB2_D_STRING 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_VWB2_D_STRING 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_VWB2_D_STRING INTO WA_VWB2_D_STRING.


*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 TKONN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VWB2_D_STRING-TKONN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWB2_D_STRING-TKONN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VENDOR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VWB2_D_STRING-VENDOR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWB2_D_STRING-VENDOR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field CUSTOMER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VWB2_D_STRING-CUSTOMER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWB2_D_STRING-CUSTOMER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field COND_UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_VWB2_D_STRING-COND_UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWB2_D_STRING-COND_UNIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TKONN_MM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VWB2_D_STRING-TKONN_MM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWB2_D_STRING-TKONN_MM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TKONN_SD
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VWB2_D_STRING-TKONN_SD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWB2_D_STRING-TKONN_SD.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field QUANTITY_UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_VWB2_D_STRING-QUANTITY_UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWB2_D_STRING-QUANTITY_UNIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field WASHED_QUAN_UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_VWB2_D_STRING-WASHED_QUAN_UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWB2_D_STRING-WASHED_QUAN_UNIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ASSIG_CUST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VWB2_D_STRING-ASSIG_CUST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWB2_D_STRING-ASSIG_CUST.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ASSIG_VEND
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VWB2_D_STRING-ASSIG_VEND
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VWB2_D_STRING-ASSIG_VEND.
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_VWB2_D_STRING_STR, 
CLIENT TYPE STRING,
TKONN TYPE STRING,
GUID TYPE STRING,
STRING_ORDER TYPE STRING,
FLAG_FIRST TYPE STRING,
VENDOR TYPE STRING,
CUSTOMER TYPE STRING,
NETPR TYPE STRING,
CURR TYPE STRING,
PRICING_UNIT TYPE STRING,
COND_UNIT TYPE STRING,
TRADER_ROLE TYPE STRING,
TKONN_MM TYPE STRING,
TPOSN_MM TYPE STRING,
TKONN_SD TYPE STRING,
TPOSN_SD TYPE STRING,
QUANTITY TYPE STRING,
QUANTITY_UNIT TYPE STRING,
WASHED_QUAN TYPE STRING,
WASHED_QUAN_UNIT TYPE STRING,
FROZEN TYPE STRING,
ASSIG_CUST TYPE STRING,
ASSIG_VEND TYPE STRING,
_DATAAGING TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VWB2_D_STRING_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_VWB2_D_STRING_STR-CLIENT sy-vline 
WA_VWB2_D_STRING_STR-TKONN sy-vline 
WA_VWB2_D_STRING_STR-GUID sy-vline 
WA_VWB2_D_STRING_STR-STRING_ORDER sy-vline 
WA_VWB2_D_STRING_STR-FLAG_FIRST sy-vline 
WA_VWB2_D_STRING_STR-VENDOR sy-vline 
WA_VWB2_D_STRING_STR-CUSTOMER sy-vline 
WA_VWB2_D_STRING_STR-NETPR sy-vline 
WA_VWB2_D_STRING_STR-CURR sy-vline 
WA_VWB2_D_STRING_STR-PRICING_UNIT sy-vline 
WA_VWB2_D_STRING_STR-COND_UNIT sy-vline 
WA_VWB2_D_STRING_STR-TRADER_ROLE sy-vline 
WA_VWB2_D_STRING_STR-TKONN_MM sy-vline 
WA_VWB2_D_STRING_STR-TPOSN_MM sy-vline 
WA_VWB2_D_STRING_STR-TKONN_SD sy-vline 
WA_VWB2_D_STRING_STR-TPOSN_SD sy-vline 
WA_VWB2_D_STRING_STR-QUANTITY sy-vline 
WA_VWB2_D_STRING_STR-QUANTITY_UNIT sy-vline 
WA_VWB2_D_STRING_STR-WASHED_QUAN sy-vline 
WA_VWB2_D_STRING_STR-WASHED_QUAN_UNIT sy-vline 
WA_VWB2_D_STRING_STR-FROZEN sy-vline 
WA_VWB2_D_STRING_STR-ASSIG_CUST sy-vline 
WA_VWB2_D_STRING_STR-ASSIG_VEND sy-vline 
WA_VWB2_D_STRING_STR-_DATAAGING sy-vline 
WA_VWB2_D_STRING_STR-KZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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