ABAP Select data from SAP table LIKPUKWA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LIKPUKWA
*  INTO TABLE @DATA(IT_LIKPUKWA2).
*--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_LIKPUKWA INDEX 1 INTO DATA(WA_LIKPUKWA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LIKPUKWA>-SELKZ = 1.
<LIKPUKWA>-VBELN = 1.
<LIKPUKWA>-STATUS = 1.
<LIKPUKWA>-ERNAM = 1.
<LIKPUKWA>-ERZET = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LIKPUKWA-ERDAT, sy-vline,
  WA_LIKPUKWA-BZIRK, sy-vline,
  WA_LIKPUKWA-VSTEL, sy-vline,
  WA_LIKPUKWA-VKORG, sy-vline,
  WA_LIKPUKWA-LFART, sy-vline,
  WA_LIKPUKWA-AUTLF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LIKPUKWA 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_LIKPUKWA 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_LIKPUKWA INTO WA_LIKPUKWA.


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

*Conversion exit ALPHA, internal->external for field KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LIKPUKWA-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LIKPUKWA-KUNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNAG
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LIKPUKWA-KUNAG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LIKPUKWA-KUNAG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TKNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LIKPUKWA-TKNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LIKPUKWA-TKNUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field MBLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LIKPUKWA-MBLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LIKPUKWA-MBLNR.
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_LIKPUKWA_STR, 
SELKZ TYPE STRING,
VBELN TYPE STRING,
STATUS TYPE STRING,
ERNAM TYPE STRING,
ERZET TYPE STRING,
ERDAT TYPE STRING,
BZIRK TYPE STRING,
VSTEL TYPE STRING,
VKORG TYPE STRING,
LFART TYPE STRING,
AUTLF TYPE STRING,
KZAZU TYPE STRING,
WADAT TYPE STRING,
LDDAT TYPE STRING,
TDDAT TYPE STRING,
LFDAT TYPE STRING,
KODAT TYPE STRING,
ROUTE TYPE STRING,
VBTYP TYPE STRING,
KUNNR TYPE STRING,
KUNAG TYPE STRING,
ANZPK TYPE STRING,
LSTEL TYPE STRING,
TRAGR TYPE STRING,
FKDAT TYPE STRING,
LFSTK TYPE STRING,
WBSTK TYPE STRING,
FKSTK TYPE STRING,
GBSTK TYPE STRING,
KOSTK TYPE STRING,
KOQUK TYPE STRING,
LVSTK TYPE STRING,
PKSTK TYPE STRING,
TRSTA TYPE STRING,
TKNUM TYPE STRING,
MBLNR TYPE STRING,
STDAT TYPE STRING,
WADAT_IST TYPE STRING,
PDSTK TYPE STRING,
STATUS_BEW TYPE STRING,
PODAT TYPE STRING,
POTIM TYPE STRING,
KNFAK TYPE STRING,
LFUHR TYPE STRING,
MSR_ACTIVE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LIKPUKWA_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_LIKPUKWA_STR-SELKZ sy-vline 
WA_LIKPUKWA_STR-VBELN sy-vline 
WA_LIKPUKWA_STR-STATUS sy-vline 
WA_LIKPUKWA_STR-ERNAM sy-vline 
WA_LIKPUKWA_STR-ERZET sy-vline 
WA_LIKPUKWA_STR-ERDAT sy-vline 
WA_LIKPUKWA_STR-BZIRK sy-vline 
WA_LIKPUKWA_STR-VSTEL sy-vline 
WA_LIKPUKWA_STR-VKORG sy-vline 
WA_LIKPUKWA_STR-LFART sy-vline 
WA_LIKPUKWA_STR-AUTLF sy-vline 
WA_LIKPUKWA_STR-KZAZU sy-vline 
WA_LIKPUKWA_STR-WADAT sy-vline 
WA_LIKPUKWA_STR-LDDAT sy-vline 
WA_LIKPUKWA_STR-TDDAT sy-vline 
WA_LIKPUKWA_STR-LFDAT sy-vline 
WA_LIKPUKWA_STR-KODAT sy-vline 
WA_LIKPUKWA_STR-ROUTE sy-vline 
WA_LIKPUKWA_STR-VBTYP sy-vline 
WA_LIKPUKWA_STR-KUNNR sy-vline 
WA_LIKPUKWA_STR-KUNAG sy-vline 
WA_LIKPUKWA_STR-ANZPK sy-vline 
WA_LIKPUKWA_STR-LSTEL sy-vline 
WA_LIKPUKWA_STR-TRAGR sy-vline 
WA_LIKPUKWA_STR-FKDAT sy-vline 
WA_LIKPUKWA_STR-LFSTK sy-vline 
WA_LIKPUKWA_STR-WBSTK sy-vline 
WA_LIKPUKWA_STR-FKSTK sy-vline 
WA_LIKPUKWA_STR-GBSTK sy-vline 
WA_LIKPUKWA_STR-KOSTK sy-vline 
WA_LIKPUKWA_STR-KOQUK sy-vline 
WA_LIKPUKWA_STR-LVSTK sy-vline 
WA_LIKPUKWA_STR-PKSTK sy-vline 
WA_LIKPUKWA_STR-TRSTA sy-vline 
WA_LIKPUKWA_STR-TKNUM sy-vline 
WA_LIKPUKWA_STR-MBLNR sy-vline 
WA_LIKPUKWA_STR-STDAT sy-vline 
WA_LIKPUKWA_STR-WADAT_IST sy-vline 
WA_LIKPUKWA_STR-PDSTK sy-vline 
WA_LIKPUKWA_STR-STATUS_BEW sy-vline 
WA_LIKPUKWA_STR-PODAT sy-vline 
WA_LIKPUKWA_STR-POTIM sy-vline 
WA_LIKPUKWA_STR-KNFAK sy-vline 
WA_LIKPUKWA_STR-LFUHR sy-vline 
WA_LIKPUKWA_STR-MSR_ACTIVE sy-vline      INTO ld_text SEPARATED BY SPACE.

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