ABAP Select data from SAP table LIST_OI into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LIST_OI
*  INTO TABLE @DATA(IT_LIST_OI2).
*--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_LIST_OI INDEX 1 INTO DATA(WA_LIST_OI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LIST_OI>-CLSNAME = 1.
<LIST_OI>-TEXT = 1.
<LIST_OI>-VERSION = 1.
<LIST_OI>-DEVCLASS = 1.
<LIST_OI>-CATEGORY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LIST_OI-EXPOSURE, sy-vline,
  WA_LIST_OI-STATE, sy-vline,
  WA_LIST_OI-CLSEMBED, sy-vline,
  WA_LIST_OI-AUTHOR, sy-vline,
  WA_LIST_OI-CREATEDON, sy-vline,
  WA_LIST_OI-CHANGEDBY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LIST_OI 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_LIST_OI 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_LIST_OI INTO WA_LIST_OI.


*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 ISOLA, internal->external for field MASTERLANG
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_LIST_OI-MASTERLANG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LIST_OI-MASTERLANG.
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_LIST_OI_STR, 
CLSNAME TYPE STRING,
TEXT TYPE STRING,
VERSION TYPE STRING,
DEVCLASS TYPE STRING,
CATEGORY TYPE STRING,
EXPOSURE TYPE STRING,
STATE TYPE STRING,
CLSEMBED TYPE STRING,
AUTHOR TYPE STRING,
CREATEDON TYPE STRING,
CHANGEDBY TYPE STRING,
CHAGEDON TYPE STRING,
MASTERLANG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LIST_OI_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_LIST_OI_STR-CLSNAME sy-vline 
WA_LIST_OI_STR-TEXT sy-vline 
WA_LIST_OI_STR-VERSION sy-vline 
WA_LIST_OI_STR-DEVCLASS sy-vline 
WA_LIST_OI_STR-CATEGORY sy-vline 
WA_LIST_OI_STR-EXPOSURE sy-vline 
WA_LIST_OI_STR-STATE sy-vline 
WA_LIST_OI_STR-CLSEMBED sy-vline 
WA_LIST_OI_STR-AUTHOR sy-vline 
WA_LIST_OI_STR-CREATEDON sy-vline 
WA_LIST_OI_STR-CHANGEDBY sy-vline 
WA_LIST_OI_STR-CHAGEDON sy-vline 
WA_LIST_OI_STR-MASTERLANG sy-vline      INTO ld_text SEPARATED BY SPACE.

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