ABAP Select data from SAP table M_PLMWB into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP M_PLMWB 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_PLMWB. 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_PLMWB 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_PLMWB TYPE STANDARD TABLE OF M_PLMWB,
      WA_M_PLMWB TYPE M_PLMWB,
      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_PLMWB> TYPE M_PLMWB.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM M_PLMWB
*  INTO TABLE @DATA(IT_M_PLMWB2).
*--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_PLMWB INDEX 1 INTO DATA(WA_M_PLMWB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<M_PLMWB>-MANDT = 1.
<M_PLMWB>-KATAB2 = 1.
<M_PLMWB>-KATALGART2 = 1.
<M_PLMWB>-AUSWMENGE2 = 1.
<M_PLMWB>-AUSWMGWRK2 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_M_PLMWB-AUSWVERS2, sy-vline,
  WA_M_PLMWB-AUSWDAT2, sy-vline,
  WA_M_PLMWB-PLNTY, sy-vline,
  WA_M_PLMWB-PLNNR, sy-vline,
  WA_M_PLMWB-PLNKN, sy-vline,
  WA_M_PLMWB-KZEINSTELL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_M_PLMWB 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_PLMWB 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_PLMWB INTO WA_M_PLMWB.


*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 AUSWVERS2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_M_PLMWB-AUSWVERS2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_M_PLMWB-AUSWVERS2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PLNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_M_PLMWB-PLNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_M_PLMWB-PLNNR.
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_PLMWB_STR, 
MANDT TYPE STRING,
KATAB2 TYPE STRING,
KATALGART2 TYPE STRING,
AUSWMENGE2 TYPE STRING,
AUSWMGWRK2 TYPE STRING,
AUSWVERS2 TYPE STRING,
AUSWDAT2 TYPE STRING,
PLNTY TYPE STRING,
PLNNR TYPE STRING,
PLNKN TYPE STRING,
KZEINSTELL TYPE STRING,
MERKNR TYPE STRING,
ZUORDNR TYPE STRING,
ZAEHL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_M_PLMWB_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_PLMWB_STR-MANDT sy-vline 
WA_M_PLMWB_STR-KATAB2 sy-vline 
WA_M_PLMWB_STR-KATALGART2 sy-vline 
WA_M_PLMWB_STR-AUSWMENGE2 sy-vline 
WA_M_PLMWB_STR-AUSWMGWRK2 sy-vline 
WA_M_PLMWB_STR-AUSWVERS2 sy-vline 
WA_M_PLMWB_STR-AUSWDAT2 sy-vline 
WA_M_PLMWB_STR-PLNTY sy-vline 
WA_M_PLMWB_STR-PLNNR sy-vline 
WA_M_PLMWB_STR-PLNKN sy-vline 
WA_M_PLMWB_STR-KZEINSTELL sy-vline 
WA_M_PLMWB_STR-MERKNR sy-vline 
WA_M_PLMWB_STR-ZUORDNR sy-vline 
WA_M_PLMWB_STR-ZAEHL sy-vline      INTO ld_text SEPARATED BY SPACE.

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