ABAP Select data from SAP table PTDB_BKNE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PTDB_BKNE
*  INTO TABLE @DATA(IT_PTDB_BKNE2).
*--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_PTDB_BKNE INDEX 1 INTO DATA(WA_PTDB_BKNE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PTDB_BKNE>-ZVKAN = 1.
<PTDB_BKNE>-SKPNR = 1.
<PTDB_BKNE>-MDART = 1.
<PTDB_BKNE>-BEGDA = 1.
<PTDB_BKNE>-STONR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PTDB_BKNE-WAERS, sy-vline,
  WA_PTDB_BKNE-BTAGE, sy-vline,
  WA_PTDB_BKNE-BLOHN, sy-vline,
  WA_PTDB_BKNE-AGLST, sy-vline,
  WA_PTDB_BKNE-UTAGE, sy-vline,
  WA_PTDB_BKNE-UVERG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PTDB_BKNE 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_PTDB_BKNE 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_PTDB_BKNE INTO WA_PTDB_BKNE.


*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_PTDB_BKNE_STR, 
ZVKAN TYPE STRING,
SKPNR TYPE STRING,
MDART TYPE STRING,
BEGDA TYPE STRING,
STONR TYPE STRING,
WAERS TYPE STRING,
BTAGE TYPE STRING,
BLOHN TYPE STRING,
AGLST TYPE STRING,
UTAGE TYPE STRING,
UVERG TYPE STRING,
RTAGE TYPE STRING,
RVERG TYPE STRING,
KENAJ TYPE STRING,
NACHN TYPE STRING,
VORNA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PTDB_BKNE_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_PTDB_BKNE_STR-ZVKAN sy-vline 
WA_PTDB_BKNE_STR-SKPNR sy-vline 
WA_PTDB_BKNE_STR-MDART sy-vline 
WA_PTDB_BKNE_STR-BEGDA sy-vline 
WA_PTDB_BKNE_STR-STONR sy-vline 
WA_PTDB_BKNE_STR-WAERS sy-vline 
WA_PTDB_BKNE_STR-BTAGE sy-vline 
WA_PTDB_BKNE_STR-BLOHN sy-vline 
WA_PTDB_BKNE_STR-AGLST sy-vline 
WA_PTDB_BKNE_STR-UTAGE sy-vline 
WA_PTDB_BKNE_STR-UVERG sy-vline 
WA_PTDB_BKNE_STR-RTAGE sy-vline 
WA_PTDB_BKNE_STR-RVERG sy-vline 
WA_PTDB_BKNE_STR-KENAJ sy-vline 
WA_PTDB_BKNE_STR-NACHN sy-vline 
WA_PTDB_BKNE_STR-VORNA sy-vline      INTO ld_text SEPARATED BY SPACE.

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