ABAP Select data from SAP table REG90 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP REG90 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 REG90. 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 REG90 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_REG90 TYPE STANDARD TABLE OF REG90,
      WA_REG90 TYPE REG90,
      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: <REG90> TYPE REG90.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_REG90.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM REG90
  INTO TABLE IT_REG90.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REG90
*  INTO TABLE @DATA(IT_REG902).
*--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_REG90 INDEX 1 INTO DATA(WA_REG902).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_REG90 ASSIGNING <REG90>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REG90>-MANDT = 1.
<REG90>-TURNUSJ = 1.
<REG90>-DEVCOUNT = 1.
<REG90>-VWJAHR = 1.
<REG90>-GWECDAT = 1.

ENDLOOP.

LOOP AT IT_REG90 INTO WA_REG90.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REG90-CHDEVLOC, sy-vline,
  WA_REG90-ABKARENZ, sy-vline,
  WA_REG90-LISTDISP, sy-vline,
  WA_REG90-GERTYP, sy-vline,
  WA_REG90-SPARTYP, sy-vline,
  WA_REG90-BAUKLAS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REG90 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_REG90 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_REG90 INTO WA_REG90.


*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 MATN1, internal->external for field GERTYP
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_REG90-GERTYP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG90-GERTYP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field CITY
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REG90-CITY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG90-CITY.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field STREET
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REG90-STREET
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG90-STREET.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field COUNTY_CODE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REG90-COUNTY_CODE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG90-COUNTY_CODE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TOWNSHIP_CODE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REG90-TOWNSHIP_CODE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG90-TOWNSHIP_CODE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LOS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REG90-LOS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG90-LOS.
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_REG90_STR, 
MANDT TYPE STRING,
TURNUSJ TYPE STRING,
DEVCOUNT TYPE STRING,
VWJAHR TYPE STRING,
GWECDAT TYPE STRING,
CHDEVLOC TYPE STRING,
ABKARENZ TYPE STRING,
LISTDISP TYPE STRING,
GERTYP TYPE STRING,
SPARTYP TYPE STRING,
BAUKLAS TYPE STRING,
FUNKLAS TYPE STRING,
HERST TYPE STRING,
TYPBZ TYPE STRING,
ABLEINH TYPE STRING,
OTYPE TYPE STRING,
OBJID TYPE STRING,
COUNTRY TYPE STRING,
CITY TYPE STRING,
STREET TYPE STRING,
HOUSENUM_L TYPE STRING,
HOUSENUM_H TYPE STRING,
COUNTY_CODE TYPE STRING,
TOWNSHIP_CODE TYPE STRING,
LOS TYPE STRING,
KZ_PRUEF1 TYPE STRING,
KZ_RESERV1 TYPE STRING,
KZ_PRUEF2 TYPE STRING,
KZ_RESERV2 TYPE STRING,
DEVSPART TYPE STRING,
LINE TYPE STRING,
DFLTWERK TYPE STRING,
GSTRP TYPE STRING,
GLTRP TYPE STRING,
ALL_DEV TYPE STRING,
KZ_PRUEF3 TYPE STRING,
KZ_PRUEF4 TYPE STRING,
KZ_PRUEF5 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REG90_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_REG90_STR-MANDT sy-vline 
WA_REG90_STR-TURNUSJ sy-vline 
WA_REG90_STR-DEVCOUNT sy-vline 
WA_REG90_STR-VWJAHR sy-vline 
WA_REG90_STR-GWECDAT sy-vline 
WA_REG90_STR-CHDEVLOC sy-vline 
WA_REG90_STR-ABKARENZ sy-vline 
WA_REG90_STR-LISTDISP sy-vline 
WA_REG90_STR-GERTYP sy-vline 
WA_REG90_STR-SPARTYP sy-vline 
WA_REG90_STR-BAUKLAS sy-vline 
WA_REG90_STR-FUNKLAS sy-vline 
WA_REG90_STR-HERST sy-vline 
WA_REG90_STR-TYPBZ sy-vline 
WA_REG90_STR-ABLEINH sy-vline 
WA_REG90_STR-OTYPE sy-vline 
WA_REG90_STR-OBJID sy-vline 
WA_REG90_STR-COUNTRY sy-vline 
WA_REG90_STR-CITY sy-vline 
WA_REG90_STR-STREET sy-vline 
WA_REG90_STR-HOUSENUM_L sy-vline 
WA_REG90_STR-HOUSENUM_H sy-vline 
WA_REG90_STR-COUNTY_CODE sy-vline 
WA_REG90_STR-TOWNSHIP_CODE sy-vline 
WA_REG90_STR-LOS sy-vline 
WA_REG90_STR-KZ_PRUEF1 sy-vline 
WA_REG90_STR-KZ_RESERV1 sy-vline 
WA_REG90_STR-KZ_PRUEF2 sy-vline 
WA_REG90_STR-KZ_RESERV2 sy-vline 
WA_REG90_STR-DEVSPART sy-vline 
WA_REG90_STR-LINE sy-vline 
WA_REG90_STR-DFLTWERK sy-vline 
WA_REG90_STR-GSTRP sy-vline 
WA_REG90_STR-GLTRP sy-vline 
WA_REG90_STR-ALL_DEV sy-vline 
WA_REG90_STR-KZ_PRUEF3 sy-vline 
WA_REG90_STR-KZ_PRUEF4 sy-vline 
WA_REG90_STR-KZ_PRUEF5 sy-vline      INTO ld_text SEPARATED BY SPACE.

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