ABAP Select data from SAP table OIA_NESTIT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM OIA_NESTIT
*  INTO TABLE @DATA(IT_OIA_NESTIT2).
*--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_OIA_NESTIT INDEX 1 INTO DATA(WA_OIA_NESTIT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<OIA_NESTIT>-ITNO = 1.
<OIA_NESTIT>-ITCAT = 1.
<OIA_NESTIT>-FIDOC = 1.
<OIA_NESTIT>-FIJAHR = 1.
<OIA_NESTIT>-FIBUKRS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_OIA_NESTIT-DMBTR, sy-vline,
  WA_OIA_NESTIT-WAERS, sy-vline,
  WA_OIA_NESTIT-MATNR, sy-vline,
  WA_OIA_NESTIT-WERKS, sy-vline,
  WA_OIA_NESTIT-MENGE, sy-vline,
  WA_OIA_NESTIT-MEINS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_OIA_NESTIT 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_OIA_NESTIT 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_OIA_NESTIT INTO WA_OIA_NESTIT.


*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 ALPHA, internal->external for field FIDOC
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_OIA_NESTIT-FIDOC
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OIA_NESTIT-FIDOC.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field FIJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_OIA_NESTIT-FIJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OIA_NESTIT-FIJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_OIA_NESTIT-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OIA_NESTIT-MATNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field OIEXGNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_OIA_NESTIT-OIEXGNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OIA_NESTIT-OIEXGNUM.
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_OIA_NESTIT_STR, 
ITNO TYPE STRING,
ITCAT TYPE STRING,
FIDOC TYPE STRING,
FIJAHR TYPE STRING,
FIBUKRS TYPE STRING,
DMBTR TYPE STRING,
WAERS TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
DMBTRB TYPE STRING,
FEE TYPE STRING,
BUDAT TYPE STRING,
OIEXGNUM TYPE STRING,
OIEXGTYP TYPE STRING,
SHKZG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_OIA_NESTIT_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_OIA_NESTIT_STR-ITNO sy-vline 
WA_OIA_NESTIT_STR-ITCAT sy-vline 
WA_OIA_NESTIT_STR-FIDOC sy-vline 
WA_OIA_NESTIT_STR-FIJAHR sy-vline 
WA_OIA_NESTIT_STR-FIBUKRS sy-vline 
WA_OIA_NESTIT_STR-DMBTR sy-vline 
WA_OIA_NESTIT_STR-WAERS sy-vline 
WA_OIA_NESTIT_STR-MATNR sy-vline 
WA_OIA_NESTIT_STR-WERKS sy-vline 
WA_OIA_NESTIT_STR-MENGE sy-vline 
WA_OIA_NESTIT_STR-MEINS sy-vline 
WA_OIA_NESTIT_STR-DMBTRB sy-vline 
WA_OIA_NESTIT_STR-FEE sy-vline 
WA_OIA_NESTIT_STR-BUDAT sy-vline 
WA_OIA_NESTIT_STR-OIEXGNUM sy-vline 
WA_OIA_NESTIT_STR-OIEXGTYP sy-vline 
WA_OIA_NESTIT_STR-SHKZG sy-vline      INTO ld_text SEPARATED BY SPACE.

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