ABAP Select data from SAP table RN2GL_ITEM_C into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RN2GL_ITEM_C 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 RN2GL_ITEM_C. 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 RN2GL_ITEM_C 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_RN2GL_ITEM_C TYPE STANDARD TABLE OF RN2GL_ITEM_C,
      WA_RN2GL_ITEM_C TYPE RN2GL_ITEM_C,
      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: <RN2GL_ITEM_C> TYPE RN2GL_ITEM_C.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RN2GL_ITEM_C.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RN2GL_ITEM_C
  INTO TABLE IT_RN2GL_ITEM_C.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RN2GL_ITEM_C
*  INTO TABLE @DATA(IT_RN2GL_ITEM_C2).
*--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_RN2GL_ITEM_C INDEX 1 INTO DATA(WA_RN2GL_ITEM_C2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RN2GL_ITEM_C ASSIGNING <RN2GL_ITEM_C>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RN2GL_ITEM_C>-MANDT = 1.
<RN2GL_ITEM_C>-GL_VERSION_ID = 1.
<RN2GL_ITEM_C>-ITEM_ID = 1.
<RN2GL_ITEM_C>-NAME_CLIN = 1.
<RN2GL_ITEM_C>-NAME_PAT = 1.

ENDLOOP.

LOOP AT IT_RN2GL_ITEM_C INTO WA_RN2GL_ITEM_C.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RN2GL_ITEM_C-TM_NAME, sy-vline,
  WA_RN2GL_ITEM_C-SHORT_DES, sy-vline,
  WA_RN2GL_ITEM_C-ITEMTYPE, sy-vline,
  WA_RN2GL_ITEM_C-PATH_RELEVANT, sy-vline,
  WA_RN2GL_ITEM_C-TM_RELEVANT, sy-vline,
  WA_RN2GL_ITEM_C-ISRULE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RN2GL_ITEM_C 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_RN2GL_ITEM_C 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_RN2GL_ITEM_C INTO WA_RN2GL_ITEM_C.


*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_RN2GL_ITEM_C_STR, 
MANDT TYPE STRING,
GL_VERSION_ID TYPE STRING,
ITEM_ID TYPE STRING,
NAME_CLIN TYPE STRING,
NAME_PAT TYPE STRING,
TM_NAME TYPE STRING,
SHORT_DES TYPE STRING,
ITEMTYPE TYPE STRING,
PATH_RELEVANT TYPE STRING,
TM_RELEVANT TYPE STRING,
ISRULE TYPE STRING,
ROLE_ID TYPE STRING,
BASEITEM_ID TYPE STRING,
PARENT_ITEM TYPE STRING,
DES_ID_CLIN TYPE STRING,
DES_ID_PAT TYPE STRING,
DES_ID_TECH TYPE STRING,
URL_ID TYPE STRING,
REF_PATHWAY TYPE STRING,
CORRESP_ITEM_ID TYPE STRING,
DEPEND_ITEM_ID TYPE STRING,
SORT_KEY TYPE STRING,
ZORDER TYPE STRING,
POSX TYPE STRING,
POSY TYPE STRING,
PRINT_INFO_PAT TYPE STRING,
PRINT_INFO_CLIN TYPE STRING,
DISP_INFO_PAT TYPE STRING,
DISP_INFO_CLIN TYPE STRING,
USER_FIELD TYPE STRING,
ACTION_BEHAVIOR TYPE STRING,
FILTER_STEP TYPE STRING,
NAME_CLIN_X TYPE STRING,
NAME_PAT_X TYPE STRING,
TM_NAME_X TYPE STRING,
SHORT_DES_X TYPE STRING,
ITEMTYPE_X TYPE STRING,
PATH_RELEVANT_X TYPE STRING,
TM_RELEVANT_X TYPE STRING,
ISRULE_X TYPE STRING,
ROLE_ID_X TYPE STRING,
BASEITEM_ID_X TYPE STRING,
PARENT_ITEM_X TYPE STRING,
DES_ID_CLIN_X TYPE STRING,
DES_ID_PAT_X TYPE STRING,
DES_ID_TECH_X TYPE STRING,
URL_ID_X TYPE STRING,
REF_PATHWAY_X TYPE STRING,
CORRESP_ITEM_ID_X TYPE STRING,
DEPEND_ITEM_ID_X TYPE STRING,
SORT_KEY_X TYPE STRING,
ZORDER_X TYPE STRING,
POSX_X TYPE STRING,
POSY_X TYPE STRING,
PRINT_INFO_PAT_X TYPE STRING,
PRINT_INFO_CLIN_X TYPE STRING,
DISP_INFO_PAT_X TYPE STRING,
DISP_INFO_CLIN_X TYPE STRING,
USER_FIELD_X TYPE STRING,
ACTION_BEHAVIOR_X TYPE STRING,
FILTER_STEP_X TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RN2GL_ITEM_C_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_RN2GL_ITEM_C_STR-MANDT sy-vline 
WA_RN2GL_ITEM_C_STR-GL_VERSION_ID sy-vline 
WA_RN2GL_ITEM_C_STR-ITEM_ID sy-vline 
WA_RN2GL_ITEM_C_STR-NAME_CLIN sy-vline 
WA_RN2GL_ITEM_C_STR-NAME_PAT sy-vline 
WA_RN2GL_ITEM_C_STR-TM_NAME sy-vline 
WA_RN2GL_ITEM_C_STR-SHORT_DES sy-vline 
WA_RN2GL_ITEM_C_STR-ITEMTYPE sy-vline 
WA_RN2GL_ITEM_C_STR-PATH_RELEVANT sy-vline 
WA_RN2GL_ITEM_C_STR-TM_RELEVANT sy-vline 
WA_RN2GL_ITEM_C_STR-ISRULE sy-vline 
WA_RN2GL_ITEM_C_STR-ROLE_ID sy-vline 
WA_RN2GL_ITEM_C_STR-BASEITEM_ID sy-vline 
WA_RN2GL_ITEM_C_STR-PARENT_ITEM sy-vline 
WA_RN2GL_ITEM_C_STR-DES_ID_CLIN sy-vline 
WA_RN2GL_ITEM_C_STR-DES_ID_PAT sy-vline 
WA_RN2GL_ITEM_C_STR-DES_ID_TECH sy-vline 
WA_RN2GL_ITEM_C_STR-URL_ID sy-vline 
WA_RN2GL_ITEM_C_STR-REF_PATHWAY sy-vline 
WA_RN2GL_ITEM_C_STR-CORRESP_ITEM_ID sy-vline 
WA_RN2GL_ITEM_C_STR-DEPEND_ITEM_ID sy-vline 
WA_RN2GL_ITEM_C_STR-SORT_KEY sy-vline 
WA_RN2GL_ITEM_C_STR-ZORDER sy-vline 
WA_RN2GL_ITEM_C_STR-POSX sy-vline 
WA_RN2GL_ITEM_C_STR-POSY sy-vline 
WA_RN2GL_ITEM_C_STR-PRINT_INFO_PAT sy-vline 
WA_RN2GL_ITEM_C_STR-PRINT_INFO_CLIN sy-vline 
WA_RN2GL_ITEM_C_STR-DISP_INFO_PAT sy-vline 
WA_RN2GL_ITEM_C_STR-DISP_INFO_CLIN sy-vline 
WA_RN2GL_ITEM_C_STR-USER_FIELD sy-vline 
WA_RN2GL_ITEM_C_STR-ACTION_BEHAVIOR sy-vline 
WA_RN2GL_ITEM_C_STR-FILTER_STEP sy-vline 
WA_RN2GL_ITEM_C_STR-NAME_CLIN_X sy-vline 
WA_RN2GL_ITEM_C_STR-NAME_PAT_X sy-vline 
WA_RN2GL_ITEM_C_STR-TM_NAME_X sy-vline 
WA_RN2GL_ITEM_C_STR-SHORT_DES_X sy-vline 
WA_RN2GL_ITEM_C_STR-ITEMTYPE_X sy-vline 
WA_RN2GL_ITEM_C_STR-PATH_RELEVANT_X sy-vline 
WA_RN2GL_ITEM_C_STR-TM_RELEVANT_X sy-vline 
WA_RN2GL_ITEM_C_STR-ISRULE_X sy-vline 
WA_RN2GL_ITEM_C_STR-ROLE_ID_X sy-vline 
WA_RN2GL_ITEM_C_STR-BASEITEM_ID_X sy-vline 
WA_RN2GL_ITEM_C_STR-PARENT_ITEM_X sy-vline 
WA_RN2GL_ITEM_C_STR-DES_ID_CLIN_X sy-vline 
WA_RN2GL_ITEM_C_STR-DES_ID_PAT_X sy-vline 
WA_RN2GL_ITEM_C_STR-DES_ID_TECH_X sy-vline 
WA_RN2GL_ITEM_C_STR-URL_ID_X sy-vline 
WA_RN2GL_ITEM_C_STR-REF_PATHWAY_X sy-vline 
WA_RN2GL_ITEM_C_STR-CORRESP_ITEM_ID_X sy-vline 
WA_RN2GL_ITEM_C_STR-DEPEND_ITEM_ID_X sy-vline 
WA_RN2GL_ITEM_C_STR-SORT_KEY_X sy-vline 
WA_RN2GL_ITEM_C_STR-ZORDER_X sy-vline 
WA_RN2GL_ITEM_C_STR-POSX_X sy-vline 
WA_RN2GL_ITEM_C_STR-POSY_X sy-vline 
WA_RN2GL_ITEM_C_STR-PRINT_INFO_PAT_X sy-vline 
WA_RN2GL_ITEM_C_STR-PRINT_INFO_CLIN_X sy-vline 
WA_RN2GL_ITEM_C_STR-DISP_INFO_PAT_X sy-vline 
WA_RN2GL_ITEM_C_STR-DISP_INFO_CLIN_X sy-vline 
WA_RN2GL_ITEM_C_STR-USER_FIELD_X sy-vline 
WA_RN2GL_ITEM_C_STR-ACTION_BEHAVIOR_X sy-vline 
WA_RN2GL_ITEM_C_STR-FILTER_STEP_X sy-vline      INTO ld_text SEPARATED BY SPACE.

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