ABAP Select data from SAP table MPE_MRS_BOM2REFR into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MPE_MRS_BOM2REFR 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 MPE_MRS_BOM2REFR. 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 MPE_MRS_BOM2REFR 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_MPE_MRS_BOM2REFR TYPE STANDARD TABLE OF MPE_MRS_BOM2REFR,
      WA_MPE_MRS_BOM2REFR TYPE MPE_MRS_BOM2REFR,
      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: <MPE_MRS_BOM2REFR> TYPE MPE_MRS_BOM2REFR.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MPE_MRS_BOM2REFR.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MPE_MRS_BOM2REFR
  INTO TABLE IT_MPE_MRS_BOM2REFR.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MPE_MRS_BOM2REFR
*  INTO TABLE @DATA(IT_MPE_MRS_BOM2REFR2).
*--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_MPE_MRS_BOM2REFR INDEX 1 INTO DATA(WA_MPE_MRS_BOM2REFR2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MPE_MRS_BOM2REFR ASSIGNING <MPE_MRS_BOM2REFR>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MPE_MRS_BOM2REFR>-CLIENT = 1.
<MPE_MRS_BOM2REFR>-ROOT_ASSIGNMENT_UUID = 1.
<MPE_MRS_BOM2REFR>-BOM_HEADER_MATERIAL = 1.
<MPE_MRS_BOM2REFR>-WERKS = 1.
<MPE_MRS_BOM2REFR>-STLTY = 1.

ENDLOOP.

LOOP AT IT_MPE_MRS_BOM2REFR INTO WA_MPE_MRS_BOM2REFR.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MPE_MRS_BOM2REFR-STLAN, sy-vline,
  WA_MPE_MRS_BOM2REFR-STLNR, sy-vline,
  WA_MPE_MRS_BOM2REFR-STLAL, sy-vline,
  WA_MPE_MRS_BOM2REFR-BOM_VERSN_START, sy-vline,
  WA_MPE_MRS_BOM2REFR-BOM_VERSN_END, sy-vline,
  WA_MPE_MRS_BOM2REFR-REF_STRUCTURE_USAGE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MPE_MRS_BOM2REFR 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_MPE_MRS_BOM2REFR 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_MPE_MRS_BOM2REFR INTO WA_MPE_MRS_BOM2REFR.


*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 MATN1, internal->external for field BOM_HEADER_MATERIAL
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MPE_MRS_BOM2REFR-BOM_HEADER_MATERIAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MPE_MRS_BOM2REFR-BOM_HEADER_MATERIAL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field STLNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_MPE_MRS_BOM2REFR-STLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MPE_MRS_BOM2REFR-STLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field STLAL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MPE_MRS_BOM2REFR-STLAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MPE_MRS_BOM2REFR-STLAL.
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_MPE_MRS_BOM2REFR_STR, 
CLIENT TYPE STRING,
ROOT_ASSIGNMENT_UUID TYPE STRING,
BOM_HEADER_MATERIAL TYPE STRING,
WERKS TYPE STRING,
STLTY TYPE STRING,
STLAN TYPE STRING,
STLNR TYPE STRING,
STLAL TYPE STRING,
BOM_VERSN_START TYPE STRING,
BOM_VERSN_END TYPE STRING,
REF_STRUCTURE_USAGE TYPE STRING,
HEADER_REF_OBJECT TYPE STRING,
CREATEDBYUSER TYPE STRING,
CREATIONDATETIME TYPE STRING,
LASTCHANGEDBYUSER TYPE STRING,
LASTCHANGEDATETIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MPE_MRS_BOM2REFR_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_MPE_MRS_BOM2REFR_STR-CLIENT sy-vline 
WA_MPE_MRS_BOM2REFR_STR-ROOT_ASSIGNMENT_UUID sy-vline 
WA_MPE_MRS_BOM2REFR_STR-BOM_HEADER_MATERIAL sy-vline 
WA_MPE_MRS_BOM2REFR_STR-WERKS sy-vline 
WA_MPE_MRS_BOM2REFR_STR-STLTY sy-vline 
WA_MPE_MRS_BOM2REFR_STR-STLAN sy-vline 
WA_MPE_MRS_BOM2REFR_STR-STLNR sy-vline 
WA_MPE_MRS_BOM2REFR_STR-STLAL sy-vline 
WA_MPE_MRS_BOM2REFR_STR-BOM_VERSN_START sy-vline 
WA_MPE_MRS_BOM2REFR_STR-BOM_VERSN_END sy-vline 
WA_MPE_MRS_BOM2REFR_STR-REF_STRUCTURE_USAGE sy-vline 
WA_MPE_MRS_BOM2REFR_STR-HEADER_REF_OBJECT sy-vline 
WA_MPE_MRS_BOM2REFR_STR-CREATEDBYUSER sy-vline 
WA_MPE_MRS_BOM2REFR_STR-CREATIONDATETIME sy-vline 
WA_MPE_MRS_BOM2REFR_STR-LASTCHANGEDBYUSER sy-vline 
WA_MPE_MRS_BOM2REFR_STR-LASTCHANGEDATETIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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