ABAP Select data from SAP table O2APPL into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP O2APPL 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 O2APPL. 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 O2APPL 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_O2APPL TYPE STANDARD TABLE OF O2APPL,
      WA_O2APPL TYPE O2APPL,
      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: <O2APPL> TYPE O2APPL.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_O2APPL.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM O2APPL
  INTO TABLE IT_O2APPL.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM O2APPL
*  INTO TABLE @DATA(IT_O2APPL2).
*--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_O2APPL INDEX 1 INTO DATA(WA_O2APPL2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_O2APPL ASSIGNING <O2APPL>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<O2APPL>-APPLNAME = 1.
<O2APPL>-VERSION = 1.
<O2APPL>-APPLCLAS = 1.
<O2APPL>-AUTHOR = 1.
<O2APPL>-CREATEDON = 1.

ENDLOOP.

LOOP AT IT_O2APPL INTO WA_O2APPL.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_O2APPL-CHANGEDBY, sy-vline,
  WA_O2APPL-CHANGEDON, sy-vline,
  WA_O2APPL-APPLEXT, sy-vline,
  WA_O2APPL-THEME, sy-vline,
  WA_O2APPL-STARTPAGE, sy-vline,
  WA_O2APPL-STATEFUL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_O2APPL 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_O2APPL 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_O2APPL INTO WA_O2APPL.


*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_O2APPL_STR, 
APPLNAME TYPE STRING,
VERSION TYPE STRING,
APPLCLAS TYPE STRING,
AUTHOR TYPE STRING,
CREATEDON TYPE STRING,
CHANGEDBY TYPE STRING,
CHANGEDON TYPE STRING,
APPLEXT TYPE STRING,
THEME TYPE STRING,
STARTPAGE TYPE STRING,
STATEFUL TYPE STRING,
SESSIONMANAGEMNT TYPE STRING,
SECURITY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_O2APPL_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_O2APPL_STR-APPLNAME sy-vline 
WA_O2APPL_STR-VERSION sy-vline 
WA_O2APPL_STR-APPLCLAS sy-vline 
WA_O2APPL_STR-AUTHOR sy-vline 
WA_O2APPL_STR-CREATEDON sy-vline 
WA_O2APPL_STR-CHANGEDBY sy-vline 
WA_O2APPL_STR-CHANGEDON sy-vline 
WA_O2APPL_STR-APPLEXT sy-vline 
WA_O2APPL_STR-THEME sy-vline 
WA_O2APPL_STR-STARTPAGE sy-vline 
WA_O2APPL_STR-STATEFUL sy-vline 
WA_O2APPL_STR-SESSIONMANAGEMNT sy-vline 
WA_O2APPL_STR-SECURITY sy-vline      INTO ld_text SEPARATED BY SPACE.

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