ABAP Select data from SAP table RN2_BASEITEM_ALLERGY_D into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RN2_BASEITEM_ALLERGY_D 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 RN2_BASEITEM_ALLERGY_D. 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 RN2_BASEITEM_ALLERGY_D 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_RN2_BASEITEM_ALLERGY_D TYPE STANDARD TABLE OF RN2_BASEITEM_ALLERGY_D,
      WA_RN2_BASEITEM_ALLERGY_D TYPE RN2_BASEITEM_ALLERGY_D,
      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: <RN2_BASEITEM_ALLERGY_D> TYPE RN2_BASEITEM_ALLERGY_D.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RN2_BASEITEM_ALLERGY_D.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RN2_BASEITEM_ALLERGY_D
  INTO TABLE IT_RN2_BASEITEM_ALLERGY_D.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RN2_BASEITEM_ALLERGY_D
*  INTO TABLE @DATA(IT_RN2_BASEITEM_ALLERGY_D2).
*--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_RN2_BASEITEM_ALLERGY_D INDEX 1 INTO DATA(WA_RN2_BASEITEM_ALLERGY_D2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RN2_BASEITEM_ALLERGY_D ASSIGNING <RN2_BASEITEM_ALLERGY_D>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RN2_BASEITEM_ALLERGY_D>-MANDT = 1.
<RN2_BASEITEM_ALLERGY_D>-BASEITEMID = 1.
<RN2_BASEITEM_ALLERGY_D>-EINRI = 1.
<RN2_BASEITEM_ALLERGY_D>-NAME = 1.
<RN2_BASEITEM_ALLERGY_D>-STATUS = 1.

ENDLOOP.

LOOP AT IT_RN2_BASEITEM_ALLERGY_D INTO WA_RN2_BASEITEM_ALLERGY_D.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RN2_BASEITEM_ALLERGY_D-ITEMTYPE, sy-vline,
  WA_RN2_BASEITEM_ALLERGY_D-ACTION_ID_FIRST, sy-vline,
  WA_RN2_BASEITEM_ALLERGY_D-ACTION_ID_AGAIN, sy-vline,
  WA_RN2_BASEITEM_ALLERGY_D-EXIT_BEFORE_FLT, sy-vline,
  WA_RN2_BASEITEM_ALLERGY_D-EXIT_EXEC_FLT, sy-vline,
  WA_RN2_BASEITEM_ALLERGY_D-EXIT_AFTER_FLT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RN2_BASEITEM_ALLERGY_D 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_RN2_BASEITEM_ALLERGY_D 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_RN2_BASEITEM_ALLERGY_D INTO WA_RN2_BASEITEM_ALLERGY_D.


*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_RN2_BASEITEM_ALLERGY_D-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN2_BASEITEM_ALLERGY_D-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_RN2_BASEITEM_ALLERGY_D_STR, 
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,
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,
DESCR TYPE STRING,
QUICKINFO TYPE STRING,
DUMMY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RN2_BASEITEM_ALLERGY_D_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_RN2_BASEITEM_ALLERGY_D_STR-MANDT sy-vline 
WA_RN2_BASEITEM_ALLERGY_D_STR-BASEITEMID sy-vline 
WA_RN2_BASEITEM_ALLERGY_D_STR-EINRI sy-vline 
WA_RN2_BASEITEM_ALLERGY_D_STR-NAME sy-vline 
WA_RN2_BASEITEM_ALLERGY_D_STR-STATUS sy-vline 
WA_RN2_BASEITEM_ALLERGY_D_STR-ITEMTYPE sy-vline 
WA_RN2_BASEITEM_ALLERGY_D_STR-ACTION_ID_FIRST sy-vline 
WA_RN2_BASEITEM_ALLERGY_D_STR-ACTION_ID_AGAIN sy-vline 
WA_RN2_BASEITEM_ALLERGY_D_STR-EXIT_BEFORE_FLT sy-vline 
WA_RN2_BASEITEM_ALLERGY_D_STR-EXIT_EXEC_FLT sy-vline 
WA_RN2_BASEITEM_ALLERGY_D_STR-EXIT_AFTER_FLT sy-vline 
WA_RN2_BASEITEM_ALLERGY_D_STR-ERDAT sy-vline 
WA_RN2_BASEITEM_ALLERGY_D_STR-ERTIM sy-vline 
WA_RN2_BASEITEM_ALLERGY_D_STR-ERUSR sy-vline 
WA_RN2_BASEITEM_ALLERGY_D_STR-UPDAT sy-vline 
WA_RN2_BASEITEM_ALLERGY_D_STR-UPTIM sy-vline 
WA_RN2_BASEITEM_ALLERGY_D_STR-UPUSR sy-vline 
WA_RN2_BASEITEM_ALLERGY_D_STR-LOEKZ sy-vline 
WA_RN2_BASEITEM_ALLERGY_D_STR-LOUSR sy-vline 
WA_RN2_BASEITEM_ALLERGY_D_STR-LODAT sy-vline 
WA_RN2_BASEITEM_ALLERGY_D_STR-LOTIM sy-vline 
WA_RN2_BASEITEM_ALLERGY_D_STR-TIMESTAMP sy-vline 
WA_RN2_BASEITEM_ALLERGY_D_STR-DESCR sy-vline 
WA_RN2_BASEITEM_ALLERGY_D_STR-QUICKINFO sy-vline 
WA_RN2_BASEITEM_ALLERGY_D_STR-DUMMY sy-vline      INTO ld_text SEPARATED BY SPACE.

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