ABAP Select data from SAP table M_PLKSS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM M_PLKSS
*  INTO TABLE @DATA(IT_M_PLKSS2).
*--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_M_PLKSS INDEX 1 INTO DATA(WA_M_PLKSS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<M_PLKSS>-MANDT = 1.
<M_PLKSS>-PLNNR = 1.
<M_PLKSS>-PLNAL = 1.
<M_PLKSS>-WERKS = 1.
<M_PLKSS>-KTEXT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_M_PLKSS-VERWE, sy-vline,
  WA_M_PLKSS-VAGRP, sy-vline,
  WA_M_PLKSS-STATU, sy-vline,
  WA_M_PLKSS-PLNTY, sy-vline,
  WA_M_PLKSS-DATUV, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_M_PLKSS 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_M_PLKSS 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_M_PLKSS INTO WA_M_PLKSS.


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

*Conversion exit ALPHA, internal->external for field PLNAL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_M_PLKSS-PLNAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_M_PLKSS-PLNAL.
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_M_PLKSS_STR, 
MANDT TYPE STRING,
PLNNR TYPE STRING,
PLNAL TYPE STRING,
WERKS TYPE STRING,
KTEXT TYPE STRING,
VERWE TYPE STRING,
VAGRP TYPE STRING,
STATU TYPE STRING,
PLNTY TYPE STRING,
DATUV TYPE STRING,END OF T_EKKO_STR.
DATA: WA_M_PLKSS_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_M_PLKSS_STR-MANDT sy-vline 
WA_M_PLKSS_STR-PLNNR sy-vline 
WA_M_PLKSS_STR-PLNAL sy-vline 
WA_M_PLKSS_STR-WERKS sy-vline 
WA_M_PLKSS_STR-KTEXT sy-vline 
WA_M_PLKSS_STR-VERWE sy-vline 
WA_M_PLKSS_STR-VAGRP sy-vline 
WA_M_PLKSS_STR-STATU sy-vline 
WA_M_PLKSS_STR-PLNTY sy-vline 
WA_M_PLKSS_STR-DATUV sy-vline      INTO ld_text SEPARATED BY SPACE.

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