ABAP Select data from SAP table RN2ETDB2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RN2ETDB2 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 RN2ETDB2. 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 RN2ETDB2 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_RN2ETDB2 TYPE STANDARD TABLE OF RN2ETDB2,
      WA_RN2ETDB2 TYPE RN2ETDB2,
      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: <RN2ETDB2> TYPE RN2ETDB2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RN2ETDB2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RN2ETDB2
  INTO TABLE IT_RN2ETDB2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RN2ETDB2
*  INTO TABLE @DATA(IT_RN2ETDB22).
*--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_RN2ETDB2 INDEX 1 INTO DATA(WA_RN2ETDB22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RN2ETDB2 ASSIGNING <RN2ETDB2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RN2ETDB2>-FD_EINRI = 1.
<RN2ETDB2>-FD_DTID = 1.
<RN2ETDB2>-FD_DTVERS = 1.
<RN2ETDB2>-FD_SELCRIT = 1.
<RN2ETDB2>-FD_SAME_PAT = 1.

ENDLOOP.

LOOP AT IT_RN2ETDB2 INTO WA_RN2ETDB2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RN2ETDB2-FD_SAME_FAL, sy-vline,
  WA_RN2ETDB2-FD_SAME_BEW, sy-vline,
  WA_RN2ETDB2-FD_SAME_LEI, sy-vline,
  WA_RN2ETDB2-FD_DO_VORB, sy-vline,
  WA_RN2ETDB2-FD_ETID_SUPER, sy-vline,
  WA_RN2ETDB2-GROUPING, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RN2ETDB2 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_RN2ETDB2 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_RN2ETDB2 INTO WA_RN2ETDB2.


*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 FD_EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN2ETDB2-FD_EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN2ETDB2-FD_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_RN2ETDB2_STR, 
FD_EINRI TYPE STRING,
FD_DTID TYPE STRING,
FD_DTVERS TYPE STRING,
FD_SELCRIT TYPE STRING,
FD_SAME_PAT TYPE STRING,
FD_SAME_FAL TYPE STRING,
FD_SAME_BEW TYPE STRING,
FD_SAME_LEI TYPE STRING,
FD_DO_VORB TYPE STRING,
FD_ETID_SUPER TYPE STRING,
GROUPING TYPE STRING,
P2LINETYPE TYPE STRING,
P2TABLTYPE TYPE STRING,
P2KOMPTYPE TYPE STRING,
P2TYPERUMP TYPE STRING,
P2UEXCV_ACT TYPE STRING,
P2UEXF4_ACT TYPE STRING,
P2UEXMOD_ACT TYPE STRING,
P2UEXSUP_ACT TYPE STRING,
P2UEXCMD_ACT TYPE STRING,
P2UEXCTM_ACT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RN2ETDB2_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_RN2ETDB2_STR-FD_EINRI sy-vline 
WA_RN2ETDB2_STR-FD_DTID sy-vline 
WA_RN2ETDB2_STR-FD_DTVERS sy-vline 
WA_RN2ETDB2_STR-FD_SELCRIT sy-vline 
WA_RN2ETDB2_STR-FD_SAME_PAT sy-vline 
WA_RN2ETDB2_STR-FD_SAME_FAL sy-vline 
WA_RN2ETDB2_STR-FD_SAME_BEW sy-vline 
WA_RN2ETDB2_STR-FD_SAME_LEI sy-vline 
WA_RN2ETDB2_STR-FD_DO_VORB sy-vline 
WA_RN2ETDB2_STR-FD_ETID_SUPER sy-vline 
WA_RN2ETDB2_STR-GROUPING sy-vline 
WA_RN2ETDB2_STR-P2LINETYPE sy-vline 
WA_RN2ETDB2_STR-P2TABLTYPE sy-vline 
WA_RN2ETDB2_STR-P2KOMPTYPE sy-vline 
WA_RN2ETDB2_STR-P2TYPERUMP sy-vline 
WA_RN2ETDB2_STR-P2UEXCV_ACT sy-vline 
WA_RN2ETDB2_STR-P2UEXF4_ACT sy-vline 
WA_RN2ETDB2_STR-P2UEXMOD_ACT sy-vline 
WA_RN2ETDB2_STR-P2UEXSUP_ACT sy-vline 
WA_RN2ETDB2_STR-P2UEXCMD_ACT sy-vline 
WA_RN2ETDB2_STR-P2UEXCTM_ACT sy-vline      INTO ld_text SEPARATED BY SPACE.

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