ABAP Select data from SAP table PKCON into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PKCON
*  INTO TABLE @DATA(IT_PKCON2).
*--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_PKCON INDEX 1 INTO DATA(WA_PKCON2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PKCON>-SATZA = 1.
<PKCON>-TERID = 1.
<PKCON>-LDATE = 1.
<PKCON>-LTIME = 1.
<PKCON>-ERDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PKCON-ERTIM, sy-vline,
  WA_PKCON-PKKEY, sy-vline,
  WA_PKCON-PKNUM, sy-vline,
  WA_PKCON-PKPOS, sy-vline,
  WA_PKCON-PKBST, sy-vline,
  WA_PKCON-PKIMG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PKCON 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_PKCON 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_PKCON INTO WA_PKCON.


*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 PKNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PKCON-PKNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PKCON-PKNUM.
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_PKCON_STR, 
SATZA TYPE STRING,
TERID TYPE STRING,
LDATE TYPE STRING,
LTIME TYPE STRING,
ERDAT TYPE STRING,
ERTIM TYPE STRING,
PKKEY TYPE STRING,
PKNUM TYPE STRING,
PKPOS TYPE STRING,
PKBST TYPE STRING,
PKIMG TYPE STRING,
PKAMG TYPE STRING,
PDSNR TYPE STRING,
PKLUZ TYPE STRING,
PKLDT TYPE STRING,
PKBMG TYPE STRING,
CHARG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PKCON_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_PKCON_STR-SATZA sy-vline 
WA_PKCON_STR-TERID sy-vline 
WA_PKCON_STR-LDATE sy-vline 
WA_PKCON_STR-LTIME sy-vline 
WA_PKCON_STR-ERDAT sy-vline 
WA_PKCON_STR-ERTIM sy-vline 
WA_PKCON_STR-PKKEY sy-vline 
WA_PKCON_STR-PKNUM sy-vline 
WA_PKCON_STR-PKPOS sy-vline 
WA_PKCON_STR-PKBST sy-vline 
WA_PKCON_STR-PKIMG sy-vline 
WA_PKCON_STR-PKAMG sy-vline 
WA_PKCON_STR-PDSNR sy-vline 
WA_PKCON_STR-PKLUZ sy-vline 
WA_PKCON_STR-PKLDT sy-vline 
WA_PKCON_STR-PKBMG sy-vline 
WA_PKCON_STR-CHARG sy-vline      INTO ld_text SEPARATED BY SPACE.

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