ABAP Select data from SAP table RDB_REC_GENPOS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RDB_REC_GENPOS
*  INTO TABLE @DATA(IT_RDB_REC_GENPOS2).
*--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_RDB_REC_GENPOS INDEX 1 INTO DATA(WA_RDB_REC_GENPOS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RDB_REC_GENPOS>-MANDT = 1.
<RDB_REC_GENPOS>-KEYDATE = 1.
<RDB_REC_GENPOS>-RECORDNR = 1.
<RDB_REC_GENPOS>-POSNR = 1.
<RDB_REC_GENPOS>-VALUE01 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RDB_REC_GENPOS-VALUE02, sy-vline,
  WA_RDB_REC_GENPOS-VALUE03, sy-vline,
  WA_RDB_REC_GENPOS-VALUE04, sy-vline,
  WA_RDB_REC_GENPOS-VALUE05, sy-vline,
  WA_RDB_REC_GENPOS-VALUE06, sy-vline,
  WA_RDB_REC_GENPOS-VALUE07, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RDB_REC_GENPOS 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_RDB_REC_GENPOS 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_RDB_REC_GENPOS INTO WA_RDB_REC_GENPOS.


*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_RDB_REC_GENPOS_STR, 
MANDT TYPE STRING,
KEYDATE TYPE STRING,
RECORDNR TYPE STRING,
POSNR TYPE STRING,
VALUE01 TYPE STRING,
VALUE02 TYPE STRING,
VALUE03 TYPE STRING,
VALUE04 TYPE STRING,
VALUE05 TYPE STRING,
VALUE06 TYPE STRING,
VALUE07 TYPE STRING,
VALUE08 TYPE STRING,
VALUE09 TYPE STRING,
VALUE10 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RDB_REC_GENPOS_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_RDB_REC_GENPOS_STR-MANDT sy-vline 
WA_RDB_REC_GENPOS_STR-KEYDATE sy-vline 
WA_RDB_REC_GENPOS_STR-RECORDNR sy-vline 
WA_RDB_REC_GENPOS_STR-POSNR sy-vline 
WA_RDB_REC_GENPOS_STR-VALUE01 sy-vline 
WA_RDB_REC_GENPOS_STR-VALUE02 sy-vline 
WA_RDB_REC_GENPOS_STR-VALUE03 sy-vline 
WA_RDB_REC_GENPOS_STR-VALUE04 sy-vline 
WA_RDB_REC_GENPOS_STR-VALUE05 sy-vline 
WA_RDB_REC_GENPOS_STR-VALUE06 sy-vline 
WA_RDB_REC_GENPOS_STR-VALUE07 sy-vline 
WA_RDB_REC_GENPOS_STR-VALUE08 sy-vline 
WA_RDB_REC_GENPOS_STR-VALUE09 sy-vline 
WA_RDB_REC_GENPOS_STR-VALUE10 sy-vline      INTO ld_text SEPARATED BY SPACE.

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