ABAP Select data from SAP table O2CVARENT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP O2CVARENT 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 O2CVARENT. 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 O2CVARENT 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_O2CVARENT TYPE STANDARD TABLE OF O2CVARENT,
      WA_O2CVARENT TYPE O2CVARENT,
      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: <O2CVARENT> TYPE O2CVARENT.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_O2CVARENT.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM O2CVARENT
  INTO TABLE IT_O2CVARENT.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM O2CVARENT
*  INTO TABLE @DATA(IT_O2CVARENT2).
*--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_O2CVARENT INDEX 1 INTO DATA(WA_O2CVARENT2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_O2CVARENT ASSIGNING <O2CVARENT>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<O2CVARENT>-IN_USE = 1.
<O2CVARENT>-DECL = 1.
<O2CVARENT>-SCOPE = 1.
<O2CVARENT>-ISREF = 1.
<O2CVARENT>-NAME = 1.

ENDLOOP.

LOOP AT IT_O2CVARENT INTO WA_O2CVARENT.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_O2CVARENT-NAMESPACE, sy-vline,
  WA_O2CVARENT-APPL, sy-vline,
  WA_O2CVARENT-PAGE, sy-vline,
  WA_O2CVARENT-TYP, sy-vline,
  WA_O2CVARENT-ROW, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_O2CVARENT 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_O2CVARENT 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_O2CVARENT INTO WA_O2CVARENT.


*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_O2CVARENT_STR, 
IN_USE TYPE STRING,
DECL TYPE STRING,
SCOPE TYPE STRING,
ISREF TYPE STRING,
NAME TYPE STRING,
NAMESPACE TYPE STRING,
APPL TYPE STRING,
PAGE TYPE STRING,
TYP TYPE STRING,
ROW TYPE STRING,END OF T_EKKO_STR.
DATA: WA_O2CVARENT_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_O2CVARENT_STR-IN_USE sy-vline 
WA_O2CVARENT_STR-DECL sy-vline 
WA_O2CVARENT_STR-SCOPE sy-vline 
WA_O2CVARENT_STR-ISREF sy-vline 
WA_O2CVARENT_STR-NAME sy-vline 
WA_O2CVARENT_STR-NAMESPACE sy-vline 
WA_O2CVARENT_STR-APPL sy-vline 
WA_O2CVARENT_STR-PAGE sy-vline 
WA_O2CVARENT_STR-TYP sy-vline 
WA_O2CVARENT_STR-ROW sy-vline      INTO ld_text SEPARATED BY SPACE.

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