ABAP Select data from SAP table REG12 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP REG12 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 REG12. 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 REG12 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_REG12 TYPE STANDARD TABLE OF REG12,
      WA_REG12 TYPE REG12,
      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: <REG12> TYPE REG12.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_REG12.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM REG12
  INTO TABLE IT_REG12.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REG12
*  INTO TABLE @DATA(IT_REG122).
*--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_REG12 INDEX 1 INTO DATA(WA_REG122).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_REG12 ASSIGNING <REG12>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REG12>-ABDAT1 = 1.
<REG12>-BISDAT1 = 1.
<REG12>-GERWECHS1 = 1.
<REG12>-GERWECHS2 = 1.
<REG12>-EINBDAT = 1.

ENDLOOP.

LOOP AT IT_REG12 INTO WA_REG12.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REG12-GWECHSTXT1, sy-vline,
  WA_REG12-GWECHSTXT2, sy-vline,
  WA_REG12-BGLBIS, sy-vline,
  WA_REG12-BGLKENN, sy-vline,
  WA_REG12-LOSTXT, sy-vline,
  WA_REG12-LOS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REG12 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_REG12 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_REG12 INTO WA_REG12.


*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 LOS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REG12-LOS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG12-LOS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field GERTYP
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_REG12-GERTYP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG12-GERTYP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GERNR, internal->external for field GERAET
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_REG12-GERAET
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG12-GERAET.
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_REG12_STR, 
ABDAT1 TYPE STRING,
BISDAT1 TYPE STRING,
GERWECHS1 TYPE STRING,
GERWECHS2 TYPE STRING,
EINBDAT TYPE STRING,
GWECHSTXT1 TYPE STRING,
GWECHSTXT2 TYPE STRING,
BGLBIS TYPE STRING,
BGLKENN TYPE STRING,
LOSTXT TYPE STRING,
LOS TYPE STRING,
BGLTXT TYPE STRING,
SPERRDAT TYPE STRING,
SPGRUND TYPE STRING,
SPARTYP TYPE STRING,
STICHTAG TYPE STRING,
GERTYP TYPE STRING,
SPARTE TYPE STRING,
SPARTEXT TYPE STRING,
GERAET TYPE STRING,
INFOFIELD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REG12_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_REG12_STR-ABDAT1 sy-vline 
WA_REG12_STR-BISDAT1 sy-vline 
WA_REG12_STR-GERWECHS1 sy-vline 
WA_REG12_STR-GERWECHS2 sy-vline 
WA_REG12_STR-EINBDAT sy-vline 
WA_REG12_STR-GWECHSTXT1 sy-vline 
WA_REG12_STR-GWECHSTXT2 sy-vline 
WA_REG12_STR-BGLBIS sy-vline 
WA_REG12_STR-BGLKENN sy-vline 
WA_REG12_STR-LOSTXT sy-vline 
WA_REG12_STR-LOS sy-vline 
WA_REG12_STR-BGLTXT sy-vline 
WA_REG12_STR-SPERRDAT sy-vline 
WA_REG12_STR-SPGRUND sy-vline 
WA_REG12_STR-SPARTYP sy-vline 
WA_REG12_STR-STICHTAG sy-vline 
WA_REG12_STR-GERTYP sy-vline 
WA_REG12_STR-SPARTE sy-vline 
WA_REG12_STR-SPARTEXT sy-vline 
WA_REG12_STR-GERAET sy-vline 
WA_REG12_STR-INFOFIELD sy-vline      INTO ld_text SEPARATED BY SPACE.

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