ABAP Select data from SAP table PC254 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PC254 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 PC254. 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 PC254 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_PC254 TYPE STANDARD TABLE OF PC254,
      WA_PC254 TYPE PC254,
      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: <PC254> TYPE PC254.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PC254.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PC254
  INTO TABLE IT_PC254.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PC254
*  INTO TABLE @DATA(IT_PC2542).
*--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_PC254 INDEX 1 INTO DATA(WA_PC2542).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PC254 ASSIGNING <PC254>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PC254>-FCODE = 1.
<PC254>-ENDDA = 1.
<PC254>-BEGDA = 1.
<PC254>-SEQNR = 1.
<PC254>-CNTR1 = 1.

ENDLOOP.

LOOP AT IT_PC254 INTO WA_PC254.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PC254-SUPSC, sy-vline,
  WA_PC254-SUPES, sy-vline,
  WA_PC254-EEPER, sy-vline,
  WA_PC254-EEAMT, sy-vline,
  WA_PC254-ERPCT, sy-vline,
  WA_PC254-ERAMT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PC254 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_PC254 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_PC254 INTO WA_PC254.


*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_PC254_STR, 
FCODE TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
SEQNR TYPE STRING,
CNTR1 TYPE STRING,
SUPSC TYPE STRING,
SUPES TYPE STRING,
EEPER TYPE STRING,
EEAMT TYPE STRING,
ERPCT TYPE STRING,
ERAMT TYPE STRING,
ERMUL TYPE STRING,
MEMNO TYPE STRING,
MESSG TYPE STRING,
WAERS TYPE STRING,
SUPBS TYPE STRING,
SUPWT TYPE STRING,
SCRTE TYPE STRING,
OPOUT TYPE STRING,
CNHOL TYPE STRING,
EXKIW TYPE STRING,
COEXC TYPE STRING,
NEXMPT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PC254_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_PC254_STR-FCODE sy-vline 
WA_PC254_STR-ENDDA sy-vline 
WA_PC254_STR-BEGDA sy-vline 
WA_PC254_STR-SEQNR sy-vline 
WA_PC254_STR-CNTR1 sy-vline 
WA_PC254_STR-SUPSC sy-vline 
WA_PC254_STR-SUPES sy-vline 
WA_PC254_STR-EEPER sy-vline 
WA_PC254_STR-EEAMT sy-vline 
WA_PC254_STR-ERPCT sy-vline 
WA_PC254_STR-ERAMT sy-vline 
WA_PC254_STR-ERMUL sy-vline 
WA_PC254_STR-MEMNO sy-vline 
WA_PC254_STR-MESSG sy-vline 
WA_PC254_STR-WAERS sy-vline 
WA_PC254_STR-SUPBS sy-vline 
WA_PC254_STR-SUPWT sy-vline 
WA_PC254_STR-SCRTE sy-vline 
WA_PC254_STR-OPOUT sy-vline 
WA_PC254_STR-CNHOL sy-vline 
WA_PC254_STR-EXKIW sy-vline 
WA_PC254_STR-COEXC sy-vline 
WA_PC254_STR-NEXMPT sy-vline      INTO ld_text SEPARATED BY SPACE.

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