ABAP Select data from SAP table REG83 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP REG83 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 REG83. 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 REG83 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_REG83 TYPE STANDARD TABLE OF REG83,
      WA_REG83 TYPE REG83,
      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: <REG83> TYPE REG83.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_REG83.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM REG83
  INTO TABLE IT_REG83.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REG83
*  INTO TABLE @DATA(IT_REG832).
*--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_REG83 INDEX 1 INTO DATA(WA_REG832).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_REG83 ASSIGNING <REG83>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REG83>-NUMKR = 1.
<REG83>-NUMMER1 = 1.
<REG83>-GERTYP = 1.
<REG83>-BGLBIS = 1.
<REG83>-BAUJAHR = 1.

ENDLOOP.

LOOP AT IT_REG83 INTO WA_REG83.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REG83-TEXT30, sy-vline,
  WA_REG83-GERANZ, sy-vline,
  WA_REG83-GERAET1, sy-vline,
  WA_REG83-GERAET2, sy-vline,
  WA_REG83-GERAET3, sy-vline,
  WA_REG83-GERAET4, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REG83 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_REG83 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_REG83 INTO WA_REG83.


*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_REG83-GERTYP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG83-GERTYP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GERNR, internal->external for field GERAET1
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_REG83-GERAET1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG83-GERAET1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GERNR, internal->external for field GERAET2
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_REG83-GERAET2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG83-GERAET2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GERNR, internal->external for field GERAET3
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_REG83-GERAET3
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG83-GERAET3.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GERNR, internal->external for field GERAET4
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_REG83-GERAET4
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG83-GERAET4.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GERNR, internal->external for field GERAET5
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_REG83-GERAET5
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG83-GERAET5.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GERNR, internal->external for field GERAET6
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_REG83-GERAET6
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG83-GERAET6.
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_REG83_STR, 
NUMKR TYPE STRING,
NUMMER1 TYPE STRING,
GERTYP TYPE STRING,
BGLBIS TYPE STRING,
BAUJAHR TYPE STRING,
TEXT30 TYPE STRING,
GERANZ TYPE STRING,
GERAET1 TYPE STRING,
GERAET2 TYPE STRING,
GERAET3 TYPE STRING,
GERAET4 TYPE STRING,
GERAET5 TYPE STRING,
GERAET6 TYPE STRING,
SPARTYP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REG83_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_REG83_STR-NUMKR sy-vline 
WA_REG83_STR-NUMMER1 sy-vline 
WA_REG83_STR-GERTYP sy-vline 
WA_REG83_STR-BGLBIS sy-vline 
WA_REG83_STR-BAUJAHR sy-vline 
WA_REG83_STR-TEXT30 sy-vline 
WA_REG83_STR-GERANZ sy-vline 
WA_REG83_STR-GERAET1 sy-vline 
WA_REG83_STR-GERAET2 sy-vline 
WA_REG83_STR-GERAET3 sy-vline 
WA_REG83_STR-GERAET4 sy-vline 
WA_REG83_STR-GERAET5 sy-vline 
WA_REG83_STR-GERAET6 sy-vline 
WA_REG83_STR-SPARTYP sy-vline      INTO ld_text SEPARATED BY SPACE.

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