ABAP Select data from SAP table RN2BASEITEM_U into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RN2BASEITEM_U 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 RN2BASEITEM_U. 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 RN2BASEITEM_U 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_RN2BASEITEM_U TYPE STANDARD TABLE OF RN2BASEITEM_U,
      WA_RN2BASEITEM_U TYPE RN2BASEITEM_U,
      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: <RN2BASEITEM_U> TYPE RN2BASEITEM_U.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RN2BASEITEM_U.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RN2BASEITEM_U
  INTO TABLE IT_RN2BASEITEM_U.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RN2BASEITEM_U
*  INTO TABLE @DATA(IT_RN2BASEITEM_U2).
*--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_RN2BASEITEM_U INDEX 1 INTO DATA(WA_RN2BASEITEM_U2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RN2BASEITEM_U ASSIGNING <RN2BASEITEM_U>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RN2BASEITEM_U>-UPD_DATA = 1.
<RN2BASEITEM_U>-MANDT = 1.
<RN2BASEITEM_U>-BASEITEMID = 1.
<RN2BASEITEM_U>-EINRI = 1.
<RN2BASEITEM_U>-NAME = 1.

ENDLOOP.

LOOP AT IT_RN2BASEITEM_U INTO WA_RN2BASEITEM_U.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RN2BASEITEM_U-STATUS, sy-vline,
  WA_RN2BASEITEM_U-ITEMTYPE, sy-vline,
  WA_RN2BASEITEM_U-ACTION_ID_FIRST, sy-vline,
  WA_RN2BASEITEM_U-ACTION_ID_AGAIN, sy-vline,
  WA_RN2BASEITEM_U-EXIT_BEFORE_FLT, sy-vline,
  WA_RN2BASEITEM_U-EXIT_EXEC_FLT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RN2BASEITEM_U 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_RN2BASEITEM_U 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_RN2BASEITEM_U INTO WA_RN2BASEITEM_U.


*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 EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN2BASEITEM_U-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN2BASEITEM_U-EINRI.
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_RN2BASEITEM_U_STR, 
UPD_DATA TYPE STRING,
MANDT TYPE STRING,
BASEITEMID TYPE STRING,
EINRI TYPE STRING,
NAME TYPE STRING,
STATUS TYPE STRING,
ITEMTYPE TYPE STRING,
ACTION_ID_FIRST TYPE STRING,
ACTION_ID_AGAIN TYPE STRING,
EXIT_BEFORE_FLT TYPE STRING,
EXIT_EXEC_FLT TYPE STRING,
EXIT_AFTER_FLT TYPE STRING,
SERIALIZED TYPE STRING,
ERDAT TYPE STRING,
ERTIM TYPE STRING,
ERUSR TYPE STRING,
UPDAT TYPE STRING,
UPTIM TYPE STRING,
UPUSR TYPE STRING,
LOEKZ TYPE STRING,
LOUSR TYPE STRING,
LODAT TYPE STRING,
LOTIM TYPE STRING,
TIMESTAMP TYPE STRING,
ICON TYPE STRING,
DESCR TYPE STRING,
QUICKINFO TYPE STRING,
UPD_MODE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RN2BASEITEM_U_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_RN2BASEITEM_U_STR-UPD_DATA sy-vline 
WA_RN2BASEITEM_U_STR-MANDT sy-vline 
WA_RN2BASEITEM_U_STR-BASEITEMID sy-vline 
WA_RN2BASEITEM_U_STR-EINRI sy-vline 
WA_RN2BASEITEM_U_STR-NAME sy-vline 
WA_RN2BASEITEM_U_STR-STATUS sy-vline 
WA_RN2BASEITEM_U_STR-ITEMTYPE sy-vline 
WA_RN2BASEITEM_U_STR-ACTION_ID_FIRST sy-vline 
WA_RN2BASEITEM_U_STR-ACTION_ID_AGAIN sy-vline 
WA_RN2BASEITEM_U_STR-EXIT_BEFORE_FLT sy-vline 
WA_RN2BASEITEM_U_STR-EXIT_EXEC_FLT sy-vline 
WA_RN2BASEITEM_U_STR-EXIT_AFTER_FLT sy-vline 
WA_RN2BASEITEM_U_STR-SERIALIZED sy-vline 
WA_RN2BASEITEM_U_STR-ERDAT sy-vline 
WA_RN2BASEITEM_U_STR-ERTIM sy-vline 
WA_RN2BASEITEM_U_STR-ERUSR sy-vline 
WA_RN2BASEITEM_U_STR-UPDAT sy-vline 
WA_RN2BASEITEM_U_STR-UPTIM sy-vline 
WA_RN2BASEITEM_U_STR-UPUSR sy-vline 
WA_RN2BASEITEM_U_STR-LOEKZ sy-vline 
WA_RN2BASEITEM_U_STR-LOUSR sy-vline 
WA_RN2BASEITEM_U_STR-LODAT sy-vline 
WA_RN2BASEITEM_U_STR-LOTIM sy-vline 
WA_RN2BASEITEM_U_STR-TIMESTAMP sy-vline 
WA_RN2BASEITEM_U_STR-ICON sy-vline 
WA_RN2BASEITEM_U_STR-DESCR sy-vline 
WA_RN2BASEITEM_U_STR-QUICKINFO sy-vline 
WA_RN2BASEITEM_U_STR-UPD_MODE sy-vline      INTO ld_text SEPARATED BY SPACE.

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