ABAP Select data from SAP table U_16254 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP U_16254 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 U_16254. 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 U_16254 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_U_16254 TYPE STANDARD TABLE OF U_16254,
      WA_U_16254 TYPE U_16254,
      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: <U_16254> TYPE U_16254.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_U_16254.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM U_16254
  INTO TABLE IT_U_16254.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM U_16254
*  INTO TABLE @DATA(IT_U_162542).
*--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_U_16254 INDEX 1 INTO DATA(WA_U_162542).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_U_16254 ASSIGNING <U_16254>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<U_16254>-MANDT = 1.
<U_16254>-TKNUM = 1.
<U_16254>-TSNUM = 1.
<U_16254>-ELUPD = 1.
<U_16254>-TSTYP = 1.

ENDLOOP.

LOOP AT IT_U_16254 INTO WA_U_16254.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_U_16254-TSRFO, sy-vline,
  WA_U_16254-ERNAM, sy-vline,
  WA_U_16254-ERDAT, sy-vline,
  WA_U_16254-ERZET, sy-vline,
  WA_U_16254-AENAM, sy-vline,
  WA_U_16254-AEDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_U_16254 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_U_16254 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_U_16254 INTO WA_U_16254.


*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 TKNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_U_16254-TKNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_U_16254-TKNUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TDLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_U_16254-TDLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_U_16254-TDLNR.
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_U_16254_STR, 
MANDT TYPE STRING,
TKNUM TYPE STRING,
TSNUM TYPE STRING,
ELUPD TYPE STRING,
TSTYP TYPE STRING,
TSRFO TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
ERZET TYPE STRING,
AENAM TYPE STRING,
AEDAT TYPE STRING,
AEZET TYPE STRING,
DPTBG TYPE STRING,
UPTBG TYPE STRING,
DATBG TYPE STRING,
UATBG TYPE STRING,
DPTEN TYPE STRING,
UPTEN TYPE STRING,
DATEN TYPE STRING,
UATEN TYPE STRING,
TDLNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_U_16254_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_U_16254_STR-MANDT sy-vline 
WA_U_16254_STR-TKNUM sy-vline 
WA_U_16254_STR-TSNUM sy-vline 
WA_U_16254_STR-ELUPD sy-vline 
WA_U_16254_STR-TSTYP sy-vline 
WA_U_16254_STR-TSRFO sy-vline 
WA_U_16254_STR-ERNAM sy-vline 
WA_U_16254_STR-ERDAT sy-vline 
WA_U_16254_STR-ERZET sy-vline 
WA_U_16254_STR-AENAM sy-vline 
WA_U_16254_STR-AEDAT sy-vline 
WA_U_16254_STR-AEZET sy-vline 
WA_U_16254_STR-DPTBG sy-vline 
WA_U_16254_STR-UPTBG sy-vline 
WA_U_16254_STR-DATBG sy-vline 
WA_U_16254_STR-UATBG sy-vline 
WA_U_16254_STR-DPTEN sy-vline 
WA_U_16254_STR-UPTEN sy-vline 
WA_U_16254_STR-DATEN sy-vline 
WA_U_16254_STR-UATEN sy-vline 
WA_U_16254_STR-TDLNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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