ABAP Select data from SAP table MRM_OPCK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MRM_OPCK
*  INTO TABLE @DATA(IT_MRM_OPCK2).
*--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_MRM_OPCK INDEX 1 INTO DATA(WA_MRM_OPCK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MRM_OPCK>-BPMNG = 1.
<MRM_OPCK>-BPREM = 1.
<MRM_OPCK>-BPRME = 1.
<MRM_OPCK>-BPUMN = 1.
<MRM_OPCK>-BPUMZ = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MRM_OPCK-BPWEM, sy-vline,
  WA_MRM_OPCK-BSMNG, sy-vline,
  WA_MRM_OPCK-BUDAT, sy-vline,
  WA_MRM_OPCK-BUKRS, sy-vline,
  WA_MRM_OPCK-MEINS, sy-vline,
  WA_MRM_OPCK-MENGE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MRM_OPCK 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_MRM_OPCK 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_MRM_OPCK INTO WA_MRM_OPCK.


*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 CUNIT, internal->external for field BPRME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MRM_OPCK-BPRME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRM_OPCK-BPRME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MRM_OPCK-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRM_OPCK-MEINS.
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_MRM_OPCK_STR, 
BPMNG TYPE STRING,
BPREM TYPE STRING,
BPRME TYPE STRING,
BPUMN TYPE STRING,
BPUMZ TYPE STRING,
BPWEM TYPE STRING,
BSMNG TYPE STRING,
BUDAT TYPE STRING,
BUKRS TYPE STRING,
MEINS TYPE STRING,
MENGE TYPE STRING,
NOQUANTITY TYPE STRING,
NETWR TYPE STRING,
REMNG TYPE STRING,
RETPO TYPE STRING,
SHKZG TYPE STRING,
TBTKZ TYPE STRING,
WAERS TYPE STRING,
WEBRE TYPE STRING,
WEMNG TYPE STRING,
WEPOS TYPE STRING,
XEKBZ TYPE STRING,
IVTYP TYPE STRING,
MENGE_F TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MRM_OPCK_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_MRM_OPCK_STR-BPMNG sy-vline 
WA_MRM_OPCK_STR-BPREM sy-vline 
WA_MRM_OPCK_STR-BPRME sy-vline 
WA_MRM_OPCK_STR-BPUMN sy-vline 
WA_MRM_OPCK_STR-BPUMZ sy-vline 
WA_MRM_OPCK_STR-BPWEM sy-vline 
WA_MRM_OPCK_STR-BSMNG sy-vline 
WA_MRM_OPCK_STR-BUDAT sy-vline 
WA_MRM_OPCK_STR-BUKRS sy-vline 
WA_MRM_OPCK_STR-MEINS sy-vline 
WA_MRM_OPCK_STR-MENGE sy-vline 
WA_MRM_OPCK_STR-NOQUANTITY sy-vline 
WA_MRM_OPCK_STR-NETWR sy-vline 
WA_MRM_OPCK_STR-REMNG sy-vline 
WA_MRM_OPCK_STR-RETPO sy-vline 
WA_MRM_OPCK_STR-SHKZG sy-vline 
WA_MRM_OPCK_STR-TBTKZ sy-vline 
WA_MRM_OPCK_STR-WAERS sy-vline 
WA_MRM_OPCK_STR-WEBRE sy-vline 
WA_MRM_OPCK_STR-WEMNG sy-vline 
WA_MRM_OPCK_STR-WEPOS sy-vline 
WA_MRM_OPCK_STR-XEKBZ sy-vline 
WA_MRM_OPCK_STR-IVTYP sy-vline 
WA_MRM_OPCK_STR-MENGE_F sy-vline      INTO ld_text SEPARATED BY SPACE.

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