ABAP Select data from SAP table RGIAD1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RGIAD1 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 RGIAD1. 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 RGIAD1 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_RGIAD1 TYPE STANDARD TABLE OF RGIAD1,
      WA_RGIAD1 TYPE RGIAD1,
      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: <RGIAD1> TYPE RGIAD1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RGIAD1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RGIAD1
  INTO TABLE IT_RGIAD1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RGIAD1
*  INTO TABLE @DATA(IT_RGIAD12).
*--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_RGIAD1 INDEX 1 INTO DATA(WA_RGIAD12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RGIAD1 ASSIGNING <RGIAD1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RGIAD1>-RPMAX = 1.
<RGIAD1>-BUCHKREIS = 1.
<RGIAD1>-GLSIP = 1.
<RGIAD1>-OFFSET = 1.
<RGIAD1>-POST = 1.

ENDLOOP.

LOOP AT IT_RGIAD1 INTO WA_RGIAD1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RGIAD1-V2POST, sy-vline,
  WA_RGIAD1-DOCLN, sy-vline,
  WA_RGIAD1-REFDOCLN, sy-vline,
  WA_RGIAD1-BELNR, sy-vline,
  WA_RGIAD1-BSCHL, sy-vline,
  WA_RGIAD1-XNEGP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RGIAD1 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_RGIAD1 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_RGIAD1 INTO WA_RGIAD1.


*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 BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RGIAD1-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RGIAD1-BELNR.
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_RGIAD1_STR, 
RPMAX TYPE STRING,
BUCHKREIS TYPE STRING,
GLSIP TYPE STRING,
OFFSET TYPE STRING,
POST TYPE STRING,
V2POST TYPE STRING,
DOCLN TYPE STRING,
REFDOCLN TYPE STRING,
BELNR TYPE STRING,
BSCHL TYPE STRING,
XNEGP TYPE STRING,
EXTR_ALE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RGIAD1_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_RGIAD1_STR-RPMAX sy-vline 
WA_RGIAD1_STR-BUCHKREIS sy-vline 
WA_RGIAD1_STR-GLSIP sy-vline 
WA_RGIAD1_STR-OFFSET sy-vline 
WA_RGIAD1_STR-POST sy-vline 
WA_RGIAD1_STR-V2POST sy-vline 
WA_RGIAD1_STR-DOCLN sy-vline 
WA_RGIAD1_STR-REFDOCLN sy-vline 
WA_RGIAD1_STR-BELNR sy-vline 
WA_RGIAD1_STR-BSCHL sy-vline 
WA_RGIAD1_STR-XNEGP sy-vline 
WA_RGIAD1_STR-EXTR_ALE sy-vline      INTO ld_text SEPARATED BY SPACE.

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