ABAP Select data from SAP table REGEN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REGEN
*  INTO TABLE @DATA(IT_REGEN2).
*--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_REGEN INDEX 1 INTO DATA(WA_REGEN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REGEN>-UPD_ONLINE = 1.
<REGEN>-NO_DIALOG = 1.
<REGEN>-NO_UPDATE = 1.
<REGEN>-NO_EVENT = 1.
<REGEN>-NO_STATISTIC = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REGEN-NO_CHANGE_DOC, sy-vline,
  WA_REGEN-DB_UPDATE, sy-vline,
  WA_REGEN-UPD_MODE, sy-vline,
  WA_REGEN-MAXCOUNT, sy-vline,
  WA_REGEN-CHANGED, sy-vline,
  WA_REGEN-EXIT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REGEN 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_REGEN 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_REGEN INTO WA_REGEN.


*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_REGEN_STR, 
UPD_ONLINE TYPE STRING,
NO_DIALOG TYPE STRING,
NO_UPDATE TYPE STRING,
NO_EVENT TYPE STRING,
NO_STATISTIC TYPE STRING,
NO_CHANGE_DOC TYPE STRING,
DB_UPDATE TYPE STRING,
UPD_MODE TYPE STRING,
MAXCOUNT TYPE STRING,
CHANGED TYPE STRING,
EXIT TYPE STRING,
AUTO_USE TYPE STRING,
WMODE TYPE STRING,
OVERFLOW TYPE STRING,
KZ_SORT TYPE STRING,
NUM_RANGE TYPE STRING,
EXIT_TYPE TYPE STRING,
NO_CHANGE TYPE STRING,
ENQ_DONE TYPE STRING,
DECISION TYPE STRING,
KENNZX TYPE STRING,
CL_FORCE TYPE STRING,
ACTUAL TYPE STRING,
TITEL TYPE STRING,
NO_OTHER TYPE STRING,
NO_COMMIT TYPE STRING,
EXIT_DIAL TYPE STRING,
OKCODE TYPE STRING,
AB TYPE STRING,
BIS TYPE STRING,
STICHTAG TYPE STRING,
INACTIVE TYPE STRING,
ACTIVE TYPE STRING,
TEILOBJ TYPE STRING,
PROGRAMM TYPE STRING,
BAUSTEIN TYPE STRING,
FELD_NAME TYPE STRING,
EXTINTKZ TYPE STRING,
REL_UNIQUE TYPE STRING,
ABRFAKT_EQ TYPE STRING,
ERRORLINE TYPE STRING,
HANDLE TYPE STRING,
CALLED_BY_IDOC TYPE STRING,
HISTORY TYPE STRING,
AMOUNT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REGEN_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_REGEN_STR-UPD_ONLINE sy-vline 
WA_REGEN_STR-NO_DIALOG sy-vline 
WA_REGEN_STR-NO_UPDATE sy-vline 
WA_REGEN_STR-NO_EVENT sy-vline 
WA_REGEN_STR-NO_STATISTIC sy-vline 
WA_REGEN_STR-NO_CHANGE_DOC sy-vline 
WA_REGEN_STR-DB_UPDATE sy-vline 
WA_REGEN_STR-UPD_MODE sy-vline 
WA_REGEN_STR-MAXCOUNT sy-vline 
WA_REGEN_STR-CHANGED sy-vline 
WA_REGEN_STR-EXIT sy-vline 
WA_REGEN_STR-AUTO_USE sy-vline 
WA_REGEN_STR-WMODE sy-vline 
WA_REGEN_STR-OVERFLOW sy-vline 
WA_REGEN_STR-KZ_SORT sy-vline 
WA_REGEN_STR-NUM_RANGE sy-vline 
WA_REGEN_STR-EXIT_TYPE sy-vline 
WA_REGEN_STR-NO_CHANGE sy-vline 
WA_REGEN_STR-ENQ_DONE sy-vline 
WA_REGEN_STR-DECISION sy-vline 
WA_REGEN_STR-KENNZX sy-vline 
WA_REGEN_STR-CL_FORCE sy-vline 
WA_REGEN_STR-ACTUAL sy-vline 
WA_REGEN_STR-TITEL sy-vline 
WA_REGEN_STR-NO_OTHER sy-vline 
WA_REGEN_STR-NO_COMMIT sy-vline 
WA_REGEN_STR-EXIT_DIAL sy-vline 
WA_REGEN_STR-OKCODE sy-vline 
WA_REGEN_STR-AB sy-vline 
WA_REGEN_STR-BIS sy-vline 
WA_REGEN_STR-STICHTAG sy-vline 
WA_REGEN_STR-INACTIVE sy-vline 
WA_REGEN_STR-ACTIVE sy-vline 
WA_REGEN_STR-TEILOBJ sy-vline 
WA_REGEN_STR-PROGRAMM sy-vline 
WA_REGEN_STR-BAUSTEIN sy-vline 
WA_REGEN_STR-FELD_NAME sy-vline 
WA_REGEN_STR-EXTINTKZ sy-vline 
WA_REGEN_STR-REL_UNIQUE sy-vline 
WA_REGEN_STR-ABRFAKT_EQ sy-vline 
WA_REGEN_STR-ERRORLINE sy-vline 
WA_REGEN_STR-HANDLE sy-vline 
WA_REGEN_STR-CALLED_BY_IDOC sy-vline 
WA_REGEN_STR-HISTORY sy-vline 
WA_REGEN_STR-AMOUNT sy-vline      INTO ld_text SEPARATED BY SPACE.

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