ABAP Select data from SAP table DFKKZP_TREX into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DFKKZP_TREX
*  INTO TABLE @DATA(IT_DFKKZP_TREX2).
*--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_DFKKZP_TREX INDEX 1 INTO DATA(WA_DFKKZP_TREX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DFKKZP_TREX>-KEYZ1 = 1.
<DFKKZP_TREX>-POSZA = 1.
<DFKKZP_TREX>-BANKN = 1.
<DFKKZP_TREX>-KOINH = 1.
<DFKKZP_TREX>-CHCKN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DFKKZP_TREX-CCNUM, sy-vline,
  WA_DFKKZP_TREX-WAERS, sy-vline,
  WA_DFKKZP_TREX-BETRZ, sy-vline,
  WA_DFKKZP_TREX-TXTVW, sy-vline,
  WA_DFKKZP_TREX-ERDAT, sy-vline,
  WA_DFKKZP_TREX-BUKRS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DFKKZP_TREX 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_DFKKZP_TREX 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_DFKKZP_TREX INTO WA_DFKKZP_TREX.


*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_DFKKZP_TREX_STR, 
KEYZ1 TYPE STRING,
POSZA TYPE STRING,
BANKN TYPE STRING,
KOINH TYPE STRING,
CHCKN TYPE STRING,
CCNUM TYPE STRING,
WAERS TYPE STRING,
BETRZ TYPE STRING,
TXTVW TYPE STRING,
ERDAT TYPE STRING,
BUKRS TYPE STRING,
CGUID TYPE STRING,
IBAN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DFKKZP_TREX_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_DFKKZP_TREX_STR-KEYZ1 sy-vline 
WA_DFKKZP_TREX_STR-POSZA sy-vline 
WA_DFKKZP_TREX_STR-BANKN sy-vline 
WA_DFKKZP_TREX_STR-KOINH sy-vline 
WA_DFKKZP_TREX_STR-CHCKN sy-vline 
WA_DFKKZP_TREX_STR-CCNUM sy-vline 
WA_DFKKZP_TREX_STR-WAERS sy-vline 
WA_DFKKZP_TREX_STR-BETRZ sy-vline 
WA_DFKKZP_TREX_STR-TXTVW sy-vline 
WA_DFKKZP_TREX_STR-ERDAT sy-vline 
WA_DFKKZP_TREX_STR-BUKRS sy-vline 
WA_DFKKZP_TREX_STR-CGUID sy-vline 
WA_DFKKZP_TREX_STR-IBAN sy-vline      INTO ld_text SEPARATED BY SPACE.

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