ABAP Select data from SAP table WCVU1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WCVU1 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 WCVU1. 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 WCVU1 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_WCVU1 TYPE STANDARD TABLE OF WCVU1,
      WA_WCVU1 TYPE WCVU1,
      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: <WCVU1> TYPE WCVU1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_WCVU1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM WCVU1
  INTO TABLE IT_WCVU1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WCVU1
*  INTO TABLE @DATA(IT_WCVU12).
*--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_WCVU1 INDEX 1 INTO DATA(WA_WCVU12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_WCVU1 ASSIGNING <WCVU1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WCVU1>-MANDT = 1.
<WCVU1>-IWERK = 1.
<WCVU1>-WCUSE = 1.
<WCVU1>-NAME1 = 1.
<WCVU1>-WCUSEX = 1.

ENDLOOP.

LOOP AT IT_WCVU1 INTO WA_WCVU1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WCVU1-BTGFLG, sy-vline,
  WA_WCVU1-PTAGFLG, sy-vline,
  WA_WCVU1-BTUGFLG, sy-vline,
  WA_WCVU1-PTSTFLG, sy-vline,
  WA_WCVU1-BUGFLG, sy-vline,
  WA_WCVU1-PMSOG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WCVU1 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_WCVU1 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_WCVU1 INTO WA_WCVU1.


*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_WCVU1_STR, 
MANDT TYPE STRING,
IWERK TYPE STRING,
WCUSE TYPE STRING,
NAME1 TYPE STRING,
WCUSEX TYPE STRING,
BTGFLG TYPE STRING,
PTAGFLG TYPE STRING,
BTUGFLG TYPE STRING,
PTSTFLG TYPE STRING,
BUGFLG TYPE STRING,
PMSOG TYPE STRING,
TGSOG TYPE STRING,
TUGSOG TYPE STRING,
UGSOG TYPE STRING,
PHASECTRL TYPE STRING,
PAFLG TYPE STRING,
MULTIFLG TYPE STRING,
MOBIFLG TYPE STRING,
STEPFLG TYPE STRING,
MDTGFLG TYPE STRING,
STXT TYPE STRING,
PTXT TYPE STRING,
USECTRL TYPE STRING,
INT_RANGE TYPE STRING,
EXT_RANGE TYPE STRING,
VIEWPROFILE TYPE STRING,
USE4GEN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WCVU1_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_WCVU1_STR-MANDT sy-vline 
WA_WCVU1_STR-IWERK sy-vline 
WA_WCVU1_STR-WCUSE sy-vline 
WA_WCVU1_STR-NAME1 sy-vline 
WA_WCVU1_STR-WCUSEX sy-vline 
WA_WCVU1_STR-BTGFLG sy-vline 
WA_WCVU1_STR-PTAGFLG sy-vline 
WA_WCVU1_STR-BTUGFLG sy-vline 
WA_WCVU1_STR-PTSTFLG sy-vline 
WA_WCVU1_STR-BUGFLG sy-vline 
WA_WCVU1_STR-PMSOG sy-vline 
WA_WCVU1_STR-TGSOG sy-vline 
WA_WCVU1_STR-TUGSOG sy-vline 
WA_WCVU1_STR-UGSOG sy-vline 
WA_WCVU1_STR-PHASECTRL sy-vline 
WA_WCVU1_STR-PAFLG sy-vline 
WA_WCVU1_STR-MULTIFLG sy-vline 
WA_WCVU1_STR-MOBIFLG sy-vline 
WA_WCVU1_STR-STEPFLG sy-vline 
WA_WCVU1_STR-MDTGFLG sy-vline 
WA_WCVU1_STR-STXT sy-vline 
WA_WCVU1_STR-PTXT sy-vline 
WA_WCVU1_STR-USECTRL sy-vline 
WA_WCVU1_STR-INT_RANGE sy-vline 
WA_WCVU1_STR-EXT_RANGE sy-vline 
WA_WCVU1_STR-VIEWPROFILE sy-vline 
WA_WCVU1_STR-USE4GEN sy-vline      INTO ld_text SEPARATED BY SPACE.

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