ABAP Select data from SAP table WB2_VCFG into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WB2_VCFG 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 WB2_VCFG. 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 WB2_VCFG 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_WB2_VCFG TYPE STANDARD TABLE OF WB2_VCFG,
      WA_WB2_VCFG TYPE WB2_VCFG,
      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: <WB2_VCFG> TYPE WB2_VCFG.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_WB2_VCFG.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM WB2_VCFG
  INTO TABLE IT_WB2_VCFG.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WB2_VCFG
*  INTO TABLE @DATA(IT_WB2_VCFG2).
*--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_WB2_VCFG INDEX 1 INTO DATA(WA_WB2_VCFG2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_WB2_VCFG ASSIGNING <WB2_VCFG>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WB2_VCFG>-CUOBJ = 1.
<WB2_VCFG>-ATNAM = 1.
<WB2_VCFG>-ATBEZ = 1.
<WB2_VCFG>-ATWRT = 1.
<WB2_VCFG>-ATWRT_INTERN = 1.

ENDLOOP.

LOOP AT IT_WB2_VCFG INTO WA_WB2_VCFG.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WB2_VCFG-ATWTB, sy-vline,
  WA_WB2_VCFG-ATEIN, sy-vline,
  WA_WB2_VCFG-ATERF, sy-vline,
  WA_WB2_VCFG-ATINP, sy-vline,
  WA_WB2_VCFG-ATSON, sy-vline,
  WA_WB2_VCFG-ATVIE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WB2_VCFG 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_WB2_VCFG 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_WB2_VCFG INTO WA_WB2_VCFG.


*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 ATINN, internal->external for field ATINN
CALL FUNCTION 'CONVERSION_EXIT_ATINN_OUTPUT'
  EXPORTING
    input =                      WA_WB2_VCFG-ATINN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WB2_VCFG-ATINN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MSEHI_LOW
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WB2_VCFG-MSEHI_LOW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WB2_VCFG-MSEHI_LOW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MSEHI_HIGH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WB2_VCFG-MSEHI_HIGH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WB2_VCFG-MSEHI_HIGH.
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_WB2_VCFG_STR, 
CUOBJ TYPE STRING,
ATNAM TYPE STRING,
ATBEZ TYPE STRING,
ATWRT TYPE STRING,
ATWRT_INTERN TYPE STRING,
ATWTB TYPE STRING,
ATEIN TYPE STRING,
ATERF TYPE STRING,
ATINP TYPE STRING,
ATSON TYPE STRING,
ATVIE TYPE STRING,
ATFOR TYPE STRING,
ATKLE TYPE STRING,
ATINT TYPE STRING,
FLASS TYPE STRING,
SET TYPE STRING,
SELKZ TYPE STRING,
ATFLV TYPE STRING,
ATINN TYPE STRING,
ATFLB TYPE STRING,
ATCOD TYPE STRING,
ATINC TYPE STRING,
ATFLV_INTERN TYPE STRING,
ATFLB_INTERN TYPE STRING,
MSEHI_LOW TYPE STRING,
MSEHI_HIGH TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WB2_VCFG_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_WB2_VCFG_STR-CUOBJ sy-vline 
WA_WB2_VCFG_STR-ATNAM sy-vline 
WA_WB2_VCFG_STR-ATBEZ sy-vline 
WA_WB2_VCFG_STR-ATWRT sy-vline 
WA_WB2_VCFG_STR-ATWRT_INTERN sy-vline 
WA_WB2_VCFG_STR-ATWTB sy-vline 
WA_WB2_VCFG_STR-ATEIN sy-vline 
WA_WB2_VCFG_STR-ATERF sy-vline 
WA_WB2_VCFG_STR-ATINP sy-vline 
WA_WB2_VCFG_STR-ATSON sy-vline 
WA_WB2_VCFG_STR-ATVIE sy-vline 
WA_WB2_VCFG_STR-ATFOR sy-vline 
WA_WB2_VCFG_STR-ATKLE sy-vline 
WA_WB2_VCFG_STR-ATINT sy-vline 
WA_WB2_VCFG_STR-FLASS sy-vline 
WA_WB2_VCFG_STR-SET sy-vline 
WA_WB2_VCFG_STR-SELKZ sy-vline 
WA_WB2_VCFG_STR-ATFLV sy-vline 
WA_WB2_VCFG_STR-ATINN sy-vline 
WA_WB2_VCFG_STR-ATFLB sy-vline 
WA_WB2_VCFG_STR-ATCOD sy-vline 
WA_WB2_VCFG_STR-ATINC sy-vline 
WA_WB2_VCFG_STR-ATFLV_INTERN sy-vline 
WA_WB2_VCFG_STR-ATFLB_INTERN sy-vline 
WA_WB2_VCFG_STR-MSEHI_LOW sy-vline 
WA_WB2_VCFG_STR-MSEHI_HIGH sy-vline      INTO ld_text SEPARATED BY SPACE.

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